Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons

Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Anhaus, Philipp [verfasserIn] Haas, Christian [akademischer betreuerIn] Kanzow, Torsten - 1971- [akademischer betreuerIn]
Körperschaften:	Universität Bremen [Grad-verleihende Institution]
Hochschulschrift:	Dissertation ; Universität Bremen ; 2022

Format:	E-Book
Sprache:	Englisch

Erschienen:	Bremen: 2022

Schlagwörter:	sea ice Arctic Ocean solar radiation transmittance remotely operated vehicle snow depth melt ponds leads
Formangabe:	Hochschulschrift

Umfang:	1 Online-Ressource (v, 144 Seiten) ; Illustrationen

Weitere Ausgabe:	Erscheint auch als Druck-Ausgabe Anhaus, Philipp: Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons - Bremen, 2022

Links:	Link aufrufen Link aufrufen Link aufrufen Link aufrufen Link aufrufen

DOI / URN:	urn:nbn:de:gbv:46-elib58334 10.26092/elib/1456

Katalog-ID:	1799513696

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Indexfelder

author_variant	p a pa
matchkey_str	anhausphilipphaaschristiankanzowtorsten:2022----:matosoadufccniinordainlxshogacisa
oclc_num	1312253589
hierarchy_sort_str	2022
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allfields	urn:nbn:de:gbv:46-elib58334 urn 10.26092/elib/1456 doi (DE-627)1799513696 (DE-599)KXP1799513696 (OCoLC)1312253589 DE-627 ger DE-627 rda eng XA-DE-HB 551.34 DE-101 550 DE-101 Anhaus, Philipp verfasserin aut Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons submitted by Philipp Anhaus Bremen 2022 1 Online-Ressource (v, 144 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 sea ice Arctic Ocean solar radiation transmittance remotely operated vehicle snow depth melt ponds leads Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Haas, Christian akademischer betreuerin dgs Kanzow, Torsten 1971- akademischer betreuerin (DE-588)129630772 (DE-627)475215435 (DE-576)297757857 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 Anhaus, Philipp Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons Bremen, 2022 v, 144 Seiten (DE-627)1799513955 http://dx.doi.org/10.26092/elib/1456 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 Resolving-System kostenfrei https://d-nb.info/1338948423/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5833 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 4593077346 x 12-10-24 21 01 0046 4117245279 ebook_2022_dissbremen Kostenloser Zugriff zza 13-04-22 22 01 0018 4593180198 SUBolrd xu 12-10-24 23 01 0830 4593229243 olr-d x 12-10-24 30 01 0104 459327625X z 12-10-24 40 01 0007 4593309808 xsn 12-10-24 60 01 0705 4593367611 OLRD z 12-10-24 63 01 3401 4593423260 ORD x 12-10-24 70 01 0089 4593474442 z 12-10-24 105 01 0841 4593865980 z 12-10-24 110 01 3110 459357823X x 12-10-24 132 01 0959 4593621976 OLR-DISS x 12-10-24 151 01 0546 4593665086 OLR-ODISS z 12-10-24 161 01 0960 4593688124 ORD z 12-10-24 293 01 3293 4593815975 ORD z 12-10-24 370 01 4370 4593853745 x 12-10-24 2403 01 DE-LFER 4131722518 00 --%%-- --%%-- n --%%-- l01 11-05-22 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 21 01 0046 https://doi.org/10.26092/elib/1456 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/1456 21 00 DE-46 00 Universität Bremen 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2022_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-elib58334 urn 10.26092/elib/1456 doi (DE-627)1799513696 (DE-599)KXP1799513696 (OCoLC)1312253589 DE-627 ger DE-627 rda eng XA-DE-HB 551.34 DE-101 550 DE-101 Anhaus, Philipp verfasserin aut Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons submitted by Philipp Anhaus Bremen 2022 1 Online-Ressource (v, 144 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 sea ice Arctic Ocean solar radiation transmittance remotely operated vehicle snow depth melt ponds leads Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Haas, Christian akademischer betreuerin dgs Kanzow, Torsten 1971- akademischer betreuerin (DE-588)129630772 (DE-627)475215435 (DE-576)297757857 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 Anhaus, Philipp Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons Bremen, 2022 v, 144 Seiten (DE-627)1799513955 http://dx.doi.org/10.26092/elib/1456 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 Resolving-System kostenfrei https://d-nb.info/1338948423/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5833 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 4593077346 x 12-10-24 21 01 0046 4117245279 ebook_2022_dissbremen Kostenloser Zugriff zza 13-04-22 22 01 0018 4593180198 SUBolrd xu 12-10-24 23 01 0830 4593229243 olr-d x 12-10-24 30 01 0104 459327625X z 12-10-24 40 01 0007 4593309808 xsn 12-10-24 60 01 0705 4593367611 OLRD z 12-10-24 63 01 3401 4593423260 ORD x 12-10-24 70 01 0089 4593474442 z 12-10-24 105 01 0841 4593865980 z 12-10-24 110 01 3110 459357823X x 12-10-24 132 01 0959 4593621976 OLR-DISS x 12-10-24 151 01 0546 4593665086 OLR-ODISS z 12-10-24 161 01 0960 4593688124 ORD z 12-10-24 293 01 3293 4593815975 ORD z 12-10-24 370 01 4370 4593853745 x 12-10-24 2403 01 DE-LFER 4131722518 00 --%%-- --%%-- n --%%-- l01 11-05-22 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 21 01 0046 https://doi.org/10.26092/elib/1456 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/1456 21 00 DE-46 00 Universität Bremen 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2022_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-elib58334 urn 10.26092/elib/1456 doi (DE-627)1799513696 (DE-599)KXP1799513696 (OCoLC)1312253589 DE-627 ger DE-627 rda eng XA-DE-HB 551.34 DE-101 550 DE-101 Anhaus, Philipp verfasserin aut Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons submitted by Philipp Anhaus Bremen 2022 1 Online-Ressource (v, 144 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 sea ice Arctic Ocean solar radiation transmittance remotely operated vehicle snow depth melt ponds leads Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Haas, Christian akademischer betreuerin dgs Kanzow, Torsten 1971- akademischer betreuerin (DE-588)129630772 (DE-627)475215435 (DE-576)297757857 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 Anhaus, Philipp Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons Bremen, 2022 v, 144 Seiten (DE-627)1799513955 http://dx.doi.org/10.26092/elib/1456 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 Resolving-System kostenfrei https://d-nb.info/1338948423/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5833 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 4593077346 x 12-10-24 21 01 0046 4117245279 ebook_2022_dissbremen Kostenloser Zugriff zza 13-04-22 22 01 0018 4593180198 SUBolrd xu 12-10-24 23 01 0830 4593229243 olr-d x 12-10-24 30 01 0104 459327625X z 12-10-24 40 01 0007 4593309808 xsn 12-10-24 60 01 0705 4593367611 OLRD z 12-10-24 63 01 3401 4593423260 ORD x 12-10-24 70 01 0089 4593474442 z 12-10-24 105 01 0841 4593865980 z 12-10-24 110 01 3110 459357823X x 12-10-24 132 01 0959 4593621976 OLR-DISS x 12-10-24 151 01 0546 4593665086 OLR-ODISS z 12-10-24 161 01 0960 4593688124 ORD z 12-10-24 293 01 3293 4593815975 ORD z 12-10-24 370 01 4370 4593853745 x 12-10-24 2403 01 DE-LFER 4131722518 00 --%%-- --%%-- n --%%-- l01 11-05-22 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 21 01 0046 https://doi.org/10.26092/elib/1456 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/1456 21 00 DE-46 00 Universität Bremen 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2022_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-elib58334 urn 10.26092/elib/1456 doi (DE-627)1799513696 (DE-599)KXP1799513696 (OCoLC)1312253589 DE-627 ger DE-627 rda eng XA-DE-HB 551.34 DE-101 550 DE-101 Anhaus, Philipp verfasserin aut Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons submitted by Philipp Anhaus Bremen 2022 1 Online-Ressource (v, 144 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 sea ice Arctic Ocean solar radiation transmittance remotely operated vehicle snow depth melt ponds leads Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Haas, Christian akademischer betreuerin dgs Kanzow, Torsten 1971- akademischer betreuerin (DE-588)129630772 (DE-627)475215435 (DE-576)297757857 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 Anhaus, Philipp Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons Bremen, 2022 v, 144 Seiten (DE-627)1799513955 http://dx.doi.org/10.26092/elib/1456 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 Resolving-System kostenfrei https://d-nb.info/1338948423/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5833 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 4593077346 x 12-10-24 21 01 0046 4117245279 ebook_2022_dissbremen Kostenloser Zugriff zza 13-04-22 22 01 0018 4593180198 SUBolrd xu 12-10-24 23 01 0830 4593229243 olr-d x 12-10-24 30 01 0104 459327625X z 12-10-24 40 01 0007 4593309808 xsn 12-10-24 60 01 0705 4593367611 OLRD z 12-10-24 63 01 3401 4593423260 ORD x 12-10-24 70 01 0089 4593474442 z 12-10-24 105 01 0841 4593865980 z 12-10-24 110 01 3110 459357823X x 12-10-24 132 01 0959 4593621976 OLR-DISS x 12-10-24 151 01 0546 4593665086 OLR-ODISS z 12-10-24 161 01 0960 4593688124 ORD z 12-10-24 293 01 3293 4593815975 ORD z 12-10-24 370 01 4370 4593853745 x 12-10-24 2403 01 DE-LFER 4131722518 00 --%%-- --%%-- n --%%-- l01 11-05-22 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 21 01 0046 https://doi.org/10.26092/elib/1456 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/1456 21 00 DE-46 00 Universität Bremen 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2022_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-elib58334 urn 10.26092/elib/1456 doi (DE-627)1799513696 (DE-599)KXP1799513696 (OCoLC)1312253589 DE-627 ger DE-627 rda eng XA-DE-HB 551.34 DE-101 550 DE-101 Anhaus, Philipp verfasserin aut Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons submitted by Philipp Anhaus Bremen 2022 1 Online-Ressource (v, 144 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity. Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 sea ice Arctic Ocean solar radiation transmittance remotely operated vehicle snow depth melt ponds leads Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Haas, Christian akademischer betreuerin dgs Kanzow, Torsten 1971- akademischer betreuerin (DE-588)129630772 (DE-627)475215435 (DE-576)297757857 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 Anhaus, Philipp Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons Bremen, 2022 v, 144 Seiten (DE-627)1799513955 http://dx.doi.org/10.26092/elib/1456 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 Resolving-System kostenfrei https://d-nb.info/1338948423/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/5833 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 4593077346 x 12-10-24 21 01 0046 4117245279 ebook_2022_dissbremen Kostenloser Zugriff zza 13-04-22 22 01 0018 4593180198 SUBolrd xu 12-10-24 23 01 0830 4593229243 olr-d x 12-10-24 30 01 0104 459327625X z 12-10-24 40 01 0007 4593309808 xsn 12-10-24 60 01 0705 4593367611 OLRD z 12-10-24 63 01 3401 4593423260 ORD x 12-10-24 70 01 0089 4593474442 z 12-10-24 105 01 0841 4593865980 z 12-10-24 110 01 3110 459357823X x 12-10-24 132 01 0959 4593621976 OLR-DISS x 12-10-24 151 01 0546 4593665086 OLR-ODISS z 12-10-24 161 01 0960 4593688124 ORD z 12-10-24 293 01 3293 4593815975 ORD z 12-10-24 370 01 4370 4593853745 x 12-10-24 2403 01 DE-LFER 4131722518 00 --%%-- --%%-- n --%%-- l01 11-05-22 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 21 01 0046 https://doi.org/10.26092/elib/1456 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 2403 01 DE-LFER http://dx.doi.org/10.26092/elib/1456 21 00 DE-46 00 Universität Bremen 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2022_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
language	English
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topic_facet	sea ice Arctic Ocean solar radiation transmittance remotely operated vehicle snow depth melt ponds leads
hochschulschrift_txt_mv	Dissertation Universität Bremen 2022
sw_local_iln_str_mv	21:Universität Bremen DE-46:Universität Bremen
dewey-raw	551.34
isfreeaccess_bool	true
authorswithroles_txt_mv	Anhaus, Philipp @@aut@@ Haas, Christian @@dgs@@ Kanzow, Torsten @@dgs@@
publishDateDaySort_date	2022-01-01T00:00:00Z
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genre_facet	Hochschulschrift
language_de	englisch
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Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. 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topic_title	551.34 DE-101 550 DE-101 21 00 DE-46 00 Universität Bremen Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons submitted by Philipp Anhaus sea ice Arctic Ocean solar radiation transmittance remotely operated vehicle snow depth melt ponds leads
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title_sort	impacts of snow and surface conditions on radiation fluxes through arctic sea ice during different seasons
title_auth	Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons
abstract	Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity.
abstractGer	Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity.
abstract_unstemmed	Sea ice and its snow cover play a key role within the climate and ecosystem. Due to global environmental changes which are amplified in the Arctic Ocean, its sea-ice cover will primarily consist of thin and young sea ice with a reduction in extent. In particular, the area where snow accumulates reduces and the fraction of melt-pond covered sea ice and of openings in the sea-ice cover such as leads increase. Those changes of the surface conditions strongly influence the partitioning of solar radiation. The main objective of this dissertation was to establish relationships between the surface conditions that are observed and expected to dominate in the future Arctic and under-ice radiation. A deeper and broader knowledge of such relationships is especially necessary in spring and autumn during which the under-ice radiation can have significant impacts on the annual energy budget. To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. The results point towards impacts on sea-ice energy balance, ocean heat content, thermodynamic ice growth, and ice-and ocean-associated ecosystem activity.
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title_short	Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons
url	http://dx.doi.org/10.26092/elib/1456 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib58334 https://d-nb.info/1338948423/34 https://media.suub.uni-bremen.de/handle/elib/5833
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To achieve that, field measurements collected using a variety of instruments during three campaigns for three different sea-ice types, locations, and seasons were analysed and interpreted. A main result was to derive a new parametrization for snow depth retrieval from spectral under ice-radiation measurements. This was successfully achieved with an accuracy of approximately 5 cm for two ice types, in two locations, during two seasons. In contrast to the established theory that melt ponds act as bright windows to the underlying ocean, it was possible to document and analyse cases where a thicker snow cover accumulated on melt ponds compared to on adjacent bare ice. This resulted, surprisingly, in lower levels of under-ice radiation underneath the melt ponds than underneath bare ice. New analyses of relationships between thermodynamics and optics of a refreezing lead and thin ice suggest that radiative transfer in thin ice is often not accurately accounted for using bulk formulations, as they are applicable for thicker ice. The initial states of the lead’s opening and refreezing need to be treated separately and cannot generally be considered windows into the ocean. This dissertation extended our knowledge of the relationships between snow and surface conditions and under-ice radiation. 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Impacts of snow and surface conditions on radiation fluxes through Arctic sea ice during different seasons

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