Impact of glacio-lacustrine interactions on ice-sheet dynamics

Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay. Ausführliche Beschreibung

Gespeichert in:

Autor*in:	Hinck, Sebastian [verfasserIn] Lohmann, Gerrit [akademischer betreuerIn] Humbert, Angelika - 1969- [akademischer betreuerIn]
Körperschaften:	Universität Bremen [Grad-verleihende Institution]
Hochschulschrift:	Dissertation ; Universität Bremen ; 2022

Format:	E-Book
Sprache:	Englisch

Erschienen:	Bremen: 2022

Rechteinformationen:	Open Access Namensnennung 4.0 International ; CC BY 4.0

Schlagwörter:	ice sheets proglacial lakes Ice sheet modelling
Formangabe:	Hochschulschrift

Umfang:	1 Online-Ressource (xxv, 99 Seiten) ; Illustrationen

Weitere Ausgabe:	Erscheint auch als Druck-Ausgabe Hinck, Sebastian: Impact of glacio-lacustrine interactions on ice-sheet dynamics - Bremen, 2022

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

DOI / URN:	urn:nbn:de:gbv:46-elib66039 10.26092/elib/2018

Katalog-ID:	1837401020

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Indexfelder

author_variant	s h sh
matchkey_str	hincksebastianlohmanngerrithumbertangeli:2022----:matflcoautieneatosn
oclc_num	1371099784
hierarchy_sort_str	2022
publishDate	2022
allfields	urn:nbn:de:gbv:46-elib66039 urn 10.26092/elib/2018 doi (DE-627)1837401020 (DE-599)KXP1837401020 (OCoLC)1371099784 (OAEPFHB)elib/2018 DE-627 ger DE-627 rda eng XA-DE-HB 551.48 DE-101 550 DE-101 Hinck, Sebastian verfasserin (orcid)0000-0002-6428-305X aut Impact of glacio-lacustrine interactions on ice-sheet dynamics by Sebastian Hinck Bremen 2022 1 Online-Ressource (xxv, 99 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 ice sheets proglacial lakes Ice sheet modelling Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Lohmann, Gerrit akademischer betreuerin (DE-588)1229546278 (DE-627)1751624099 dgs Humbert, Angelika 1969- akademischer betreuerin (DE-588)130003581 (DE-627)486918033 (DE-576)297945106 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 Hinck, Sebastian Impact of glacio-lacustrine interactions on ice-sheet dynamics Bremen, 2022 xxv, 99 Seiten (DE-627)1837401292 https://doi.org/10.26092/elib/2018 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 Resolving-System kostenfrei https://d-nb.info/1339303264/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/6603 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 4593079527 x 12-10-24 21 01 0046 4275680847 ebook_2023_dissbremen Kostenloser Zugriff zza 24-02-23 22 01 0018 4593181577 SUBolrd xu 12-10-24 23 01 0830 4593230411 olr-d x 12-10-24 30 01 0104 4593277256 z 12-10-24 40 01 0007 4593311632 xsn 12-10-24 60 01 0705 4593369878 OLRD z 12-10-24 63 01 3401 4593424585 ORD x 12-10-24 70 01 0089 4593477387 z 12-10-24 105 01 0841 4593868327 z 12-10-24 110 01 3110 4593580161 x 12-10-24 132 01 0959 459362374X OLR-DISS x 12-10-24 151 01 0546 4593665957 OLR-ODISS z 12-10-24 161 01 0960 459368935X ORD z 12-10-24 293 01 3293 4593817803 ORD z 12-10-24 370 01 4370 4593854067 x 12-10-24 2403 01 DE-LFER 4312854343 00 --%%-- --%%-- n --%%-- l01 24-04-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 21 01 0046 https://doi.org/10.26092/elib/2018 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 2403 01 DE-LFER https://doi.org/10.26092/elib/2018 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 01: Physik/Elektrotechnik (FB 01) 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-elib66039 urn 10.26092/elib/2018 doi (DE-627)1837401020 (DE-599)KXP1837401020 (OCoLC)1371099784 (OAEPFHB)elib/2018 DE-627 ger DE-627 rda eng XA-DE-HB 551.48 DE-101 550 DE-101 Hinck, Sebastian verfasserin (orcid)0000-0002-6428-305X aut Impact of glacio-lacustrine interactions on ice-sheet dynamics by Sebastian Hinck Bremen 2022 1 Online-Ressource (xxv, 99 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 ice sheets proglacial lakes Ice sheet modelling Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Lohmann, Gerrit akademischer betreuerin (DE-588)1229546278 (DE-627)1751624099 dgs Humbert, Angelika 1969- akademischer betreuerin (DE-588)130003581 (DE-627)486918033 (DE-576)297945106 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 Hinck, Sebastian Impact of glacio-lacustrine interactions on ice-sheet dynamics Bremen, 2022 xxv, 99 Seiten (DE-627)1837401292 https://doi.org/10.26092/elib/2018 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 Resolving-System kostenfrei https://d-nb.info/1339303264/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/6603 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 4593079527 x 12-10-24 21 01 0046 4275680847 ebook_2023_dissbremen Kostenloser Zugriff zza 24-02-23 22 01 0018 4593181577 SUBolrd xu 12-10-24 23 01 0830 4593230411 olr-d x 12-10-24 30 01 0104 4593277256 z 12-10-24 40 01 0007 4593311632 xsn 12-10-24 60 01 0705 4593369878 OLRD z 12-10-24 63 01 3401 4593424585 ORD x 12-10-24 70 01 0089 4593477387 z 12-10-24 105 01 0841 4593868327 z 12-10-24 110 01 3110 4593580161 x 12-10-24 132 01 0959 459362374X OLR-DISS x 12-10-24 151 01 0546 4593665957 OLR-ODISS z 12-10-24 161 01 0960 459368935X ORD z 12-10-24 293 01 3293 4593817803 ORD z 12-10-24 370 01 4370 4593854067 x 12-10-24 2403 01 DE-LFER 4312854343 00 --%%-- --%%-- n --%%-- l01 24-04-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 21 01 0046 https://doi.org/10.26092/elib/2018 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 2403 01 DE-LFER https://doi.org/10.26092/elib/2018 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 01: Physik/Elektrotechnik (FB 01) 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-elib66039 urn 10.26092/elib/2018 doi (DE-627)1837401020 (DE-599)KXP1837401020 (OCoLC)1371099784 (OAEPFHB)elib/2018 DE-627 ger DE-627 rda eng XA-DE-HB 551.48 DE-101 550 DE-101 Hinck, Sebastian verfasserin (orcid)0000-0002-6428-305X aut Impact of glacio-lacustrine interactions on ice-sheet dynamics by Sebastian Hinck Bremen 2022 1 Online-Ressource (xxv, 99 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 ice sheets proglacial lakes Ice sheet modelling Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Lohmann, Gerrit akademischer betreuerin (DE-588)1229546278 (DE-627)1751624099 dgs Humbert, Angelika 1969- akademischer betreuerin (DE-588)130003581 (DE-627)486918033 (DE-576)297945106 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 Hinck, Sebastian Impact of glacio-lacustrine interactions on ice-sheet dynamics Bremen, 2022 xxv, 99 Seiten (DE-627)1837401292 https://doi.org/10.26092/elib/2018 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 Resolving-System kostenfrei https://d-nb.info/1339303264/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/6603 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 4593079527 x 12-10-24 21 01 0046 4275680847 ebook_2023_dissbremen Kostenloser Zugriff zza 24-02-23 22 01 0018 4593181577 SUBolrd xu 12-10-24 23 01 0830 4593230411 olr-d x 12-10-24 30 01 0104 4593277256 z 12-10-24 40 01 0007 4593311632 xsn 12-10-24 60 01 0705 4593369878 OLRD z 12-10-24 63 01 3401 4593424585 ORD x 12-10-24 70 01 0089 4593477387 z 12-10-24 105 01 0841 4593868327 z 12-10-24 110 01 3110 4593580161 x 12-10-24 132 01 0959 459362374X OLR-DISS x 12-10-24 151 01 0546 4593665957 OLR-ODISS z 12-10-24 161 01 0960 459368935X ORD z 12-10-24 293 01 3293 4593817803 ORD z 12-10-24 370 01 4370 4593854067 x 12-10-24 2403 01 DE-LFER 4312854343 00 --%%-- --%%-- n --%%-- l01 24-04-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 21 01 0046 https://doi.org/10.26092/elib/2018 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 2403 01 DE-LFER https://doi.org/10.26092/elib/2018 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 01: Physik/Elektrotechnik (FB 01) 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-elib66039 urn 10.26092/elib/2018 doi (DE-627)1837401020 (DE-599)KXP1837401020 (OCoLC)1371099784 (OAEPFHB)elib/2018 DE-627 ger DE-627 rda eng XA-DE-HB 551.48 DE-101 550 DE-101 Hinck, Sebastian verfasserin (orcid)0000-0002-6428-305X aut Impact of glacio-lacustrine interactions on ice-sheet dynamics by Sebastian Hinck Bremen 2022 1 Online-Ressource (xxv, 99 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 ice sheets proglacial lakes Ice sheet modelling Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Lohmann, Gerrit akademischer betreuerin (DE-588)1229546278 (DE-627)1751624099 dgs Humbert, Angelika 1969- akademischer betreuerin (DE-588)130003581 (DE-627)486918033 (DE-576)297945106 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 Hinck, Sebastian Impact of glacio-lacustrine interactions on ice-sheet dynamics Bremen, 2022 xxv, 99 Seiten (DE-627)1837401292 https://doi.org/10.26092/elib/2018 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 Resolving-System kostenfrei https://d-nb.info/1339303264/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/6603 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 4593079527 x 12-10-24 21 01 0046 4275680847 ebook_2023_dissbremen Kostenloser Zugriff zza 24-02-23 22 01 0018 4593181577 SUBolrd xu 12-10-24 23 01 0830 4593230411 olr-d x 12-10-24 30 01 0104 4593277256 z 12-10-24 40 01 0007 4593311632 xsn 12-10-24 60 01 0705 4593369878 OLRD z 12-10-24 63 01 3401 4593424585 ORD x 12-10-24 70 01 0089 4593477387 z 12-10-24 105 01 0841 4593868327 z 12-10-24 110 01 3110 4593580161 x 12-10-24 132 01 0959 459362374X OLR-DISS x 12-10-24 151 01 0546 4593665957 OLR-ODISS z 12-10-24 161 01 0960 459368935X ORD z 12-10-24 293 01 3293 4593817803 ORD z 12-10-24 370 01 4370 4593854067 x 12-10-24 2403 01 DE-LFER 4312854343 00 --%%-- --%%-- n --%%-- l01 24-04-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 21 01 0046 https://doi.org/10.26092/elib/2018 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 2403 01 DE-LFER https://doi.org/10.26092/elib/2018 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 01: Physik/Elektrotechnik (FB 01) 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-elib66039 urn 10.26092/elib/2018 doi (DE-627)1837401020 (DE-599)KXP1837401020 (OCoLC)1371099784 (OAEPFHB)elib/2018 DE-627 ger DE-627 rda eng XA-DE-HB 551.48 DE-101 550 DE-101 Hinck, Sebastian verfasserin (orcid)0000-0002-6428-305X aut Impact of glacio-lacustrine interactions on ice-sheet dynamics by Sebastian Hinck Bremen 2022 1 Online-Ressource (xxv, 99 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2022 DE-46 Open Access Controlled Vocabulary for Access Rights http://purl.org/coar/access_right/c_abf2 Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay. DE-46 Namensnennung 4.0 International CC BY 4.0 cc https://creativecommons.org/licenses/by/4.0/ Archivierung/Langzeitarchivierung gewährleistet PEHB XA-DE-HB pdager DE-46 ice sheets proglacial lakes Ice sheet modelling Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Lohmann, Gerrit akademischer betreuerin (DE-588)1229546278 (DE-627)1751624099 dgs Humbert, Angelika 1969- akademischer betreuerin (DE-588)130003581 (DE-627)486918033 (DE-576)297945106 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 Hinck, Sebastian Impact of glacio-lacustrine interactions on ice-sheet dynamics Bremen, 2022 xxv, 99 Seiten (DE-627)1837401292 https://doi.org/10.26092/elib/2018 Resolving-System kostenfrei https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 Resolving-System kostenfrei https://d-nb.info/1339303264/34 Langzeitarchivierung Nationalbibliothek kostenfrei https://media.suub.uni-bremen.de/handle/elib/6603 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 4593079527 x 12-10-24 21 01 0046 4275680847 ebook_2023_dissbremen Kostenloser Zugriff zza 24-02-23 22 01 0018 4593181577 SUBolrd xu 12-10-24 23 01 0830 4593230411 olr-d x 12-10-24 30 01 0104 4593277256 z 12-10-24 40 01 0007 4593311632 xsn 12-10-24 60 01 0705 4593369878 OLRD z 12-10-24 63 01 3401 4593424585 ORD x 12-10-24 70 01 0089 4593477387 z 12-10-24 105 01 0841 4593868327 z 12-10-24 110 01 3110 4593580161 x 12-10-24 132 01 0959 459362374X OLR-DISS x 12-10-24 151 01 0546 4593665957 OLR-ODISS z 12-10-24 161 01 0960 459368935X ORD z 12-10-24 293 01 3293 4593817803 ORD z 12-10-24 370 01 4370 4593854067 x 12-10-24 2403 01 DE-LFER 4312854343 00 --%%-- --%%-- n --%%-- l01 24-04-23 20 01 0084 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 21 01 0046 https://doi.org/10.26092/elib/2018 LF 22 01 0018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 23 01 0830 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 30 01 0104 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 40 01 0007 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 60 01 0705 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 63 01 3401 E-Book https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 LF 70 01 0089 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 105 01 0841 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 110 01 3110 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 132 01 0959 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 151 01 0546 Volltext https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 161 01 0960 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 293 01 3293 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 370 01 4370 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 2403 01 DE-LFER https://doi.org/10.26092/elib/2018 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 01: Physik/Elektrotechnik (FB 01) 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
language	English
format_phy_str_mv	Book
building	20 21:z 22:u 23 30 40:s 60 63 70 105 110 132 151 161 293 370 2403:0
institution	findex.gbv.de
selectbib_iln_str_mv	20@ 21@za 22@u 23@ 30@ 40@sn 60@ 63@ 70@ 105@ 110@ 132@ 151@ 161@ 293@ 370@ 2403@01
topic_facet	ice sheets proglacial lakes Ice sheet modelling
hochschulschrift_txt_mv	Dissertation Universität Bremen 2022
sw_local_iln_str_mv	21:Universität Bremen DE-46:Universität Bremen 21:Fachbereich 01: Physik/Elektrotechnik (FB 01) DE-46:Fachbereich 01: Physik/Elektrotechnik (FB 01)
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authorswithroles_txt_mv	Hinck, Sebastian @@aut@@ Lohmann, Gerrit @@dgs@@ Humbert, Angelika @@dgs@@
publishDateDaySort_date	2022-01-01T00:00:00Z
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language_de	englisch
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topic_title	551.48 DE-101 550 DE-101 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 01: Physik/Elektrotechnik (FB 01) Impact of glacio-lacustrine interactions on ice-sheet dynamics by Sebastian Hinck ice sheets proglacial lakes Ice sheet modelling
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title_sort	impact of glacio-lacustrine interactions on ice-sheet dynamics
title_auth	Impact of glacio-lacustrine interactions on ice-sheet dynamics
abstract	Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay.
abstractGer	Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay.
abstract_unstemmed	Geological records show that large proglacial lakes existed along the land-terminating margins of the Quaternary ice sheets. The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. Furthermore, for the Laurentide ice sheet (LIS), the presence of lakes triggers a process similar to marine ice sheet instability (MISI), which causes the final collapse of the ice saddle over Hudson Bay.
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title_short	Impact of glacio-lacustrine interactions on ice-sheet dynamics
url	https://doi.org/10.26092/elib/2018 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib66039 https://d-nb.info/1339303264/34 https://media.suub.uni-bremen.de/handle/elib/6603
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The major lakes formed in basins that were left deeply depressed due to delayed glacial isostatic adjustment (GIA) when the ice sheets retreated. As the environment around the retreating ice margin is quite dynamic, the lake basins constantly change. Where an ice sheet and proglacial lake are in contact, the dynamics are similar to a marine terminating ice-sheet margin. Such lacustrine boundary conditions cause changes in the ice-sheet’s geometry, stress balance and frontal ablation and therefore affect its entire mass balance. Despite this, dynamically evolving proglacial lakes have rarely been considered in detail in ice-sheet modelling endeavors. In this Ph.D. project, the impact of proglacial lakes on the ice-sheet dynamics are investigated using numerical methods. For this reason, I implemented a new proglacial lake boundary model into the Parallel Ice Sheet Model (PISM). This model computes the lake basins each timestep according to the dynamic geometry of the ice-sheet and topography. The lake–ice interface is implemented as a generalization of the marine boundary of PISM. In the first study, the underlying algorithm, LakeCC, is tested to determine if it is capable of reconstructing known lakes. Therefore, it is applied to paleo-topographic reconstructions of North America. In a second study, the impact of the PISM-LakeCC model on the ice-sheet dynamics is tested by running several simplified experiments of the glacial retreat of the North American ice sheets after the Last Glacial Maximum (LGM). Compared to control runs, the lake experiments exhibit an accelerated glacial retreat. 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