Mobilization of terrestrial organic matter from thawing Arctic permafrost regions : insights from lignin-derived phenols and their compound-specific radiocarbon ages
Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to...
Ausführliche Beschreibung
Autor*in: |
Cao, Mengli [verfasserIn] Mollenhauer, Gesine [akademischer betreuerIn] Tesi, Tommaso [akademischer betreuerIn] |
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Körperschaften: |
Universität Bremen [Grad-verleihende Institution] |
Hochschulschrift: |
Dissertation ; Universität Bremen ; 2023 |
Format: |
E-Book |
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Sprache: |
Englisch |
Erschienen: |
Bremen: 2023 |
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Rechteinformationen: |
Open Access |
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Schlagwörter: | |
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Formangabe: |
Hochschulschrift |
Umfang: |
1 Online-Ressource (iv, 133 Seiten) ; Illustrationen |
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Weitere Ausgabe: |
Erscheint auch als Druck-Ausgabe Cao, Mengli: Mobilization of terrestrial organic matter from thawing Arctic permafrost regions - Bremen, 2023 |
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Links: |
Link aufrufen |
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DOI / URN: |
urn:nbn:de:gbv:46-elib74629 10.26092/elib/2686 |
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Katalog-ID: |
1871606780 |
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520 | |a Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. | ||
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mobilization of terrestrial organic matter from thawing arctic permafrost regionsinsights from lignin-derived phenols and their compound-specific radiocarbon ages |
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Mobilization of terrestrial organic matter from thawing Arctic permafrost regions insights from lignin-derived phenols and their compound-specific radiocarbon ages |
abstract |
Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. |
abstractGer |
Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. |
abstract_unstemmed |
Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. |
url |
https://doi.org/10.26092/elib/2686 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 https://d-nb.info/1339508664/34 https://media.suub.uni-bremen.de/handle/elib/7462 |
author2 |
Mollenhauer, Gesine Tesi, Tommaso Universität Bremen |
author2Str |
Mollenhauer, Gesine Tesi, Tommaso Universität Bremen |
ppnlink |
1871606985 |
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2023 |
allfields |
urn:nbn:de:gbv:46-elib74629 urn 10.26092/elib/2686 doi (DE-627)1871606780 (DE-599)KXP1871606780 (OCoLC)1410952112 (OAEPFHB)elib/2686 DE-627 ger DE-627 rda eng XA-DE-HB 551.3 DE-101 550 DE-101 Cao, Mengli verfasserin (orcid)0000-0003-3439-4725 aut Mobilization of terrestrial organic matter from thawing Arctic permafrost regions insights from lignin-derived phenols and their compound-specific radiocarbon ages vorgelegt von Mengli Cao Bremen 2023 1 Online-Ressource (iv, 133 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2023 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 Permafrost Organic carbon Arctic Climate warming Lignin Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Mollenhauer, Gesine akademischer betreuerin (DE-588)1257902555 (DE-627)1802587233 dgs Tesi, Tommaso akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Cao, Mengli Mobilization of terrestrial organic matter from thawing Arctic permafrost regions Bremen, 2023 iv, 133 Seiten (DE-627)1871606985 https://doi.org/10.26092/elib/2686 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 Resolving-System kostenfrei https://d-nb.info/1339508664/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/7462 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593081491 x 12-10-24 21 01 0046 4421771651 ebook_2023_dissbremen Kostenloser Zugriff zza 29-11-23 22 01 0018 4593183030 SUBolrd xu 12-10-24 23 01 0830 4593231531 olr-d x 12-10-24 30 01 0104 4593278171 z 12-10-24 40 01 0007 4593313708 xsn 12-10-24 60 01 0705 4593372038 OLRD z 12-10-24 63 01 3401 4593425840 ORD x 12-10-24 70 01 0089 4593480140 z 12-10-24 105 01 0841 4593870674 z 12-10-24 110 01 3110 4593581869 x 12-10-24 132 01 0959 4593625564 OLR-DISS x 12-10-24 151 01 0546 459366683X OLR-ODISS z 12-10-24 161 01 0960 4593690560 ORD z 12-10-24 293 01 3293 4593819717 ORD z 12-10-24 370 01 4370 4593854318 x 12-10-24 2403 01 DE-LFER 4428351127 00 --%%-- --%%-- n --%%-- l01 07-12-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 21 01 0046 https://doi.org/10.26092/elib/2686 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 2403 01 DE-LFER https://doi.org/10.26092/elib/2686 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2023_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
spelling |
urn:nbn:de:gbv:46-elib74629 urn 10.26092/elib/2686 doi (DE-627)1871606780 (DE-599)KXP1871606780 (OCoLC)1410952112 (OAEPFHB)elib/2686 DE-627 ger DE-627 rda eng XA-DE-HB 551.3 DE-101 550 DE-101 Cao, Mengli verfasserin (orcid)0000-0003-3439-4725 aut Mobilization of terrestrial organic matter from thawing Arctic permafrost regions insights from lignin-derived phenols and their compound-specific radiocarbon ages vorgelegt von Mengli Cao Bremen 2023 1 Online-Ressource (iv, 133 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2023 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 Permafrost Organic carbon Arctic Climate warming Lignin Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Mollenhauer, Gesine akademischer betreuerin (DE-588)1257902555 (DE-627)1802587233 dgs Tesi, Tommaso akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Cao, Mengli Mobilization of terrestrial organic matter from thawing Arctic permafrost regions Bremen, 2023 iv, 133 Seiten (DE-627)1871606985 https://doi.org/10.26092/elib/2686 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 Resolving-System kostenfrei https://d-nb.info/1339508664/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/7462 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593081491 x 12-10-24 21 01 0046 4421771651 ebook_2023_dissbremen Kostenloser Zugriff zza 29-11-23 22 01 0018 4593183030 SUBolrd xu 12-10-24 23 01 0830 4593231531 olr-d x 12-10-24 30 01 0104 4593278171 z 12-10-24 40 01 0007 4593313708 xsn 12-10-24 60 01 0705 4593372038 OLRD z 12-10-24 63 01 3401 4593425840 ORD x 12-10-24 70 01 0089 4593480140 z 12-10-24 105 01 0841 4593870674 z 12-10-24 110 01 3110 4593581869 x 12-10-24 132 01 0959 4593625564 OLR-DISS x 12-10-24 151 01 0546 459366683X OLR-ODISS z 12-10-24 161 01 0960 4593690560 ORD z 12-10-24 293 01 3293 4593819717 ORD z 12-10-24 370 01 4370 4593854318 x 12-10-24 2403 01 DE-LFER 4428351127 00 --%%-- --%%-- n --%%-- l01 07-12-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 21 01 0046 https://doi.org/10.26092/elib/2686 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 2403 01 DE-LFER https://doi.org/10.26092/elib/2686 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2023_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
allfields_unstemmed |
urn:nbn:de:gbv:46-elib74629 urn 10.26092/elib/2686 doi (DE-627)1871606780 (DE-599)KXP1871606780 (OCoLC)1410952112 (OAEPFHB)elib/2686 DE-627 ger DE-627 rda eng XA-DE-HB 551.3 DE-101 550 DE-101 Cao, Mengli verfasserin (orcid)0000-0003-3439-4725 aut Mobilization of terrestrial organic matter from thawing Arctic permafrost regions insights from lignin-derived phenols and their compound-specific radiocarbon ages vorgelegt von Mengli Cao Bremen 2023 1 Online-Ressource (iv, 133 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2023 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 Permafrost Organic carbon Arctic Climate warming Lignin Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Mollenhauer, Gesine akademischer betreuerin (DE-588)1257902555 (DE-627)1802587233 dgs Tesi, Tommaso akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Cao, Mengli Mobilization of terrestrial organic matter from thawing Arctic permafrost regions Bremen, 2023 iv, 133 Seiten (DE-627)1871606985 https://doi.org/10.26092/elib/2686 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 Resolving-System kostenfrei https://d-nb.info/1339508664/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/7462 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593081491 x 12-10-24 21 01 0046 4421771651 ebook_2023_dissbremen Kostenloser Zugriff zza 29-11-23 22 01 0018 4593183030 SUBolrd xu 12-10-24 23 01 0830 4593231531 olr-d x 12-10-24 30 01 0104 4593278171 z 12-10-24 40 01 0007 4593313708 xsn 12-10-24 60 01 0705 4593372038 OLRD z 12-10-24 63 01 3401 4593425840 ORD x 12-10-24 70 01 0089 4593480140 z 12-10-24 105 01 0841 4593870674 z 12-10-24 110 01 3110 4593581869 x 12-10-24 132 01 0959 4593625564 OLR-DISS x 12-10-24 151 01 0546 459366683X OLR-ODISS z 12-10-24 161 01 0960 4593690560 ORD z 12-10-24 293 01 3293 4593819717 ORD z 12-10-24 370 01 4370 4593854318 x 12-10-24 2403 01 DE-LFER 4428351127 00 --%%-- --%%-- n --%%-- l01 07-12-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 21 01 0046 https://doi.org/10.26092/elib/2686 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 2403 01 DE-LFER https://doi.org/10.26092/elib/2686 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2023_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
allfieldsGer |
urn:nbn:de:gbv:46-elib74629 urn 10.26092/elib/2686 doi (DE-627)1871606780 (DE-599)KXP1871606780 (OCoLC)1410952112 (OAEPFHB)elib/2686 DE-627 ger DE-627 rda eng XA-DE-HB 551.3 DE-101 550 DE-101 Cao, Mengli verfasserin (orcid)0000-0003-3439-4725 aut Mobilization of terrestrial organic matter from thawing Arctic permafrost regions insights from lignin-derived phenols and their compound-specific radiocarbon ages vorgelegt von Mengli Cao Bremen 2023 1 Online-Ressource (iv, 133 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2023 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 Permafrost Organic carbon Arctic Climate warming Lignin Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Mollenhauer, Gesine akademischer betreuerin (DE-588)1257902555 (DE-627)1802587233 dgs Tesi, Tommaso akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Cao, Mengli Mobilization of terrestrial organic matter from thawing Arctic permafrost regions Bremen, 2023 iv, 133 Seiten (DE-627)1871606985 https://doi.org/10.26092/elib/2686 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 Resolving-System kostenfrei https://d-nb.info/1339508664/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/7462 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593081491 x 12-10-24 21 01 0046 4421771651 ebook_2023_dissbremen Kostenloser Zugriff zza 29-11-23 22 01 0018 4593183030 SUBolrd xu 12-10-24 23 01 0830 4593231531 olr-d x 12-10-24 30 01 0104 4593278171 z 12-10-24 40 01 0007 4593313708 xsn 12-10-24 60 01 0705 4593372038 OLRD z 12-10-24 63 01 3401 4593425840 ORD x 12-10-24 70 01 0089 4593480140 z 12-10-24 105 01 0841 4593870674 z 12-10-24 110 01 3110 4593581869 x 12-10-24 132 01 0959 4593625564 OLR-DISS x 12-10-24 151 01 0546 459366683X OLR-ODISS z 12-10-24 161 01 0960 4593690560 ORD z 12-10-24 293 01 3293 4593819717 ORD z 12-10-24 370 01 4370 4593854318 x 12-10-24 2403 01 DE-LFER 4428351127 00 --%%-- --%%-- n --%%-- l01 07-12-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 21 01 0046 https://doi.org/10.26092/elib/2686 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 2403 01 DE-LFER https://doi.org/10.26092/elib/2686 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2023_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
allfieldsSound |
urn:nbn:de:gbv:46-elib74629 urn 10.26092/elib/2686 doi (DE-627)1871606780 (DE-599)KXP1871606780 (OCoLC)1410952112 (OAEPFHB)elib/2686 DE-627 ger DE-627 rda eng XA-DE-HB 551.3 DE-101 550 DE-101 Cao, Mengli verfasserin (orcid)0000-0003-3439-4725 aut Mobilization of terrestrial organic matter from thawing Arctic permafrost regions insights from lignin-derived phenols and their compound-specific radiocarbon ages vorgelegt von Mengli Cao Bremen 2023 1 Online-Ressource (iv, 133 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2023 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. This thesis highlights the vulnerability of permafrost OC to Arctic warming over time and space, thus contributing to a better understanding of climate-carbon couplings in the Earth system. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 Permafrost Organic carbon Arctic Climate warming Lignin Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Mollenhauer, Gesine akademischer betreuerin (DE-588)1257902555 (DE-627)1802587233 dgs Tesi, Tommaso akademischer betreuerin dgs Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Cao, Mengli Mobilization of terrestrial organic matter from thawing Arctic permafrost regions Bremen, 2023 iv, 133 Seiten (DE-627)1871606985 https://doi.org/10.26092/elib/2686 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 Resolving-System kostenfrei https://d-nb.info/1339508664/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/7462 Verlag kostenfrei GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER DSpace BO 20 01 0084 4593081491 x 12-10-24 21 01 0046 4421771651 ebook_2023_dissbremen Kostenloser Zugriff zza 29-11-23 22 01 0018 4593183030 SUBolrd xu 12-10-24 23 01 0830 4593231531 olr-d x 12-10-24 30 01 0104 4593278171 z 12-10-24 40 01 0007 4593313708 xsn 12-10-24 60 01 0705 4593372038 OLRD z 12-10-24 63 01 3401 4593425840 ORD x 12-10-24 70 01 0089 4593480140 z 12-10-24 105 01 0841 4593870674 z 12-10-24 110 01 3110 4593581869 x 12-10-24 132 01 0959 4593625564 OLR-DISS x 12-10-24 151 01 0546 459366683X OLR-ODISS z 12-10-24 161 01 0960 4593690560 ORD z 12-10-24 293 01 3293 4593819717 ORD z 12-10-24 370 01 4370 4593854318 x 12-10-24 2403 01 DE-LFER 4428351127 00 --%%-- --%%-- n --%%-- l01 07-12-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 21 01 0046 https://doi.org/10.26092/elib/2686 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib74629 2403 01 DE-LFER https://doi.org/10.26092/elib/2686 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2023_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2024-10-12 10:31:16 |
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<?xml version="1.0" encoding="UTF-8"?><collection xmlns="http://www.loc.gov/MARC21/slim"><record><leader>01000cam a2200265 4500</leader><controlfield tag="001">1871606780</controlfield><controlfield tag="003">DE-627</controlfield><controlfield tag="005">20240912031421.0</controlfield><controlfield tag="007">cr uuu---uuuuu</controlfield><controlfield tag="008">231129s2023 gw |||||om 00| ||eng c</controlfield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">urn:nbn:de:gbv:46-elib74629</subfield><subfield code="2">urn</subfield></datafield><datafield tag="024" ind1="7" ind2=" "><subfield code="a">10.26092/elib/2686</subfield><subfield code="2">doi</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-627)1871606780</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(DE-599)KXP1871606780</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OCoLC)1410952112</subfield></datafield><datafield tag="035" ind1=" " ind2=" "><subfield code="a">(OAEPFHB)elib/2686</subfield></datafield><datafield tag="040" ind1=" " ind2=" "><subfield code="a">DE-627</subfield><subfield code="b">ger</subfield><subfield code="c">DE-627</subfield><subfield code="e">rda</subfield></datafield><datafield tag="041" ind1=" " ind2=" "><subfield code="a">eng</subfield></datafield><datafield tag="044" ind1=" " ind2=" "><subfield code="c">XA-DE-HB</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">551.3</subfield><subfield code="q">DE-101</subfield></datafield><datafield tag="082" ind1="0" ind2="4"><subfield code="a">550</subfield><subfield code="q">DE-101</subfield></datafield><datafield tag="100" ind1="1" ind2=" "><subfield code="a">Cao, Mengli</subfield><subfield code="e">verfasserin</subfield><subfield code="0">(orcid)0000-0003-3439-4725</subfield><subfield code="4">aut</subfield></datafield><datafield tag="245" ind1="1" ind2="0"><subfield code="a">Mobilization of terrestrial organic matter from thawing Arctic permafrost regions</subfield><subfield code="b">insights from lignin-derived phenols and their compound-specific radiocarbon ages</subfield><subfield code="c">vorgelegt von Mengli Cao</subfield></datafield><datafield tag="264" ind1=" " ind2="1"><subfield code="a">Bremen</subfield><subfield code="c">2023</subfield></datafield><datafield tag="300" ind1=" " ind2=" "><subfield code="a">1 Online-Ressource (iv, 133 Seiten)</subfield><subfield code="b">Illustrationen</subfield></datafield><datafield tag="336" ind1=" " ind2=" "><subfield code="a">Text</subfield><subfield code="b">txt</subfield><subfield code="2">rdacontent</subfield></datafield><datafield tag="337" ind1=" " ind2=" "><subfield code="a">Computermedien</subfield><subfield code="b">c</subfield><subfield code="2">rdamedia</subfield></datafield><datafield tag="338" ind1=" " ind2=" "><subfield code="a">Online-Ressource</subfield><subfield code="b">cr</subfield><subfield code="2">rdacarrier</subfield></datafield><datafield tag="502" ind1=" " ind2=" "><subfield code="b">Dissertation</subfield><subfield code="c">Universität Bremen</subfield><subfield code="d">2023</subfield></datafield><datafield tag="506" ind1="0" ind2=" "><subfield code="q">DE-46</subfield><subfield code="a">Open Access</subfield><subfield code="e">Controlled Vocabulary for Access Rights</subfield><subfield code="u">http://purl.org/coar/access_right/c_abf2</subfield></datafield><datafield tag="520" ind1=" " ind2=" "><subfield code="a">Global climate change is expected to have a huge impact on Arctic warming, leading to an increased remobilization of permafrost organic carbon. More than twice as much carbon as in the atmosphere is contained in permafrost soils, and may upon destabilization expose large amounts of organic matter to microbial degradation and release climate-forcing greenhouse gases. As an important link in the land-ocean continuum, rivers are important pathways for permafrost OC remobilization. Arctic ocean sediments are thus receptors of terrestrial OC remobilization for a large part of the circum-Arctic drainage basin and offer an archive to study past terrestrial OC remobilization as during the last deglaciation. This thesis studies terrestrial OC in sub-Arctic ocean sediments to study OC remobilization from permafrost regions across temporal and spatial scales. A detailed study of two sediment cores from the Bering Sea and Okhotsk Sea, allowed the reconstruction of vegetation development, permafrost OC mobilization, and transport pathways of permafrost OC remobilization during the last deglaciation. Vegetation development and permafrost OC remobilization have been investigated by analyses of the mass accumulation rate of terrestrial biomarkers (lignin phenols and lipids). To study the influence of climatic conditions on the stability of inland permafrost soils, the sea surface temperature of the Bering Sea was investigated (TEXL86). For the study of terrestrial OC remobilization from different carbon pools, compound-specific radiocarbon analysis (CSRA) was applied to terrestrial compounds (lignin-derived phenols). A modified method for the purification of lignin-derived phenols was used for CSRA. Downcore records of lignin flux from the Yukon and Amur basins covering the early deglaciation to the Holocene are discussed in the first study. It was found that vegetation change and permafrost remobilization occurred earlier in the Yukon than in the Amur basin. The retreat of sea ice coupled with increased sea surface temperatures in the Bering Sea and adjacent ocean areas during the early deglaciation (19.0-14.6 kyr) might have promoted early permafrost mobilization. The results reveal that lipids and lignin might have been delivered to the ocean by identical processes, i.e., runoff and erosion, which is not consistent with previous studies of modern Arctic river systems. A simplified procedure for the purification of lignin phenols based on the published method by Feng et al., (2013b) and an evaluation of the fraction of modern carbon (F14C) and the mass of the associated procedural blank is described in the second study. Lignin phenols were purified only by one HLB SPE cartridge (Waters Oasis, 200 mg, 6 mL). Samples were eluted from the HLB cartridge with 60 mL ethyl acetate to achieve a clean-up of lignin-derived phenols. Single compound separation and collection was achieved by HPLC on a Phenomenex Synergi Polar-RP column at 40 °C. The blank carbon contribution of the entire method, as determined with reference compounds, was found to be 4.17 ± 0.35 mgC with an F14C of 0.55 ± 0.04. In the third study, the revised method of lignin purification was applied to obtain first downcore CSRA records of lignin-derived phenols from sediment cores retrieved off the Yukon and Amur Basins. The radiocarbon ages of phenols from sediments of the Bering and Okhotsk Seas are expected to reflect inputs from at least two different terrigenous sources that are characterized by different ages and degradation degrees during the last deglaciation. The age offsets between lignin phenols and fatty acids were controlled by surface discharge in the Yukon and Amur Basins. Deep OC enriched in long-chain lipids can be mobilized both through coastal erosion and thawing of inland thermokarst which can be transported to marine sediments by surface runoff in the last deglaciation. The radiocarbon ages of lignin phenols and long-chain fatty acids are controlled by processes that are affected by climate change, and the 14C age offset between lipids and lignin phenols can be used as palaeo-proxy for these changing processes. The fourth study investigates lignin phenols flux and radiocarbon ages in short cores off the Lena River, covering the last century. The vegetation in the Lena Basin is a mixture of woody gymnosperm and non-woody angiosperm sources and has not changed significantly in the past century. Young and old terrigenous carbon pools both affect the D14C values of phenols in the two sediment cores. The D14C values of lignin phenols in shallow Laptev Sea sediments may be treated as an indicator of runoff. 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