A marine record of Patagonian ice sheet changes over the past 140,000 years
Terrestrial glacial records from the Patagonian Andes and New Zealand Alps docu- ment quasi-synchronous Southern Hemisphere–wide glacier advances during the late Quaternary. However, these records are inherently incomplete. Here, we provide a contin- uous marine record of western–central Patagonian...
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ftpubman:oai:pure.mpg.de:item_3582854 2024-04-28T07:57:39+00:00 A marine record of Patagonian ice sheet changes over the past 140,000 years Hagemann, J. Lamy, F. Arzd, H. Lembke-Jene, L. Auderset, A. Harada, N. Ho, S. Iwasaki, S. Kaiser, J. Lange, C. Murayama, M. Nagashima, K. Nowaczyk, N. Martinez-Garcia, A. Tiedemann, R. Davies, B. 2024-03-04 http://hdl.handle.net/21.11116/0000-000F-213E-7 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.230298312 http://hdl.handle.net/21.11116/0000-000F-213E-7 Proceedings of the National Academy of Sciences of the United States of America info:eu-repo/semantics/article 2024 ftpubman https://doi.org/10.1073/pnas.230298312 2024-04-10T23:39:13Z Terrestrial glacial records from the Patagonian Andes and New Zealand Alps docu- ment quasi-synchronous Southern Hemisphere–wide glacier advances during the late Quaternary. However, these records are inherently incomplete. Here, we provide a contin- uous marine record of western–central Patagonian ice sheet (PIS) extent over a complete glacial–interglacial cycle back into the penultimate glacial (~140 ka). Sediment core MR16-09 PC03, located at 46°S and ~150 km offshore Chile, received high terrestrial sediment and meltwater input when the central PIS extended westward. We use biomark- ers, foraminiferal oxygen isotopes, and major elemental data to reconstruct terrestrial sediment and freshwater input related to PIS variations. Our sediment record documents three intervals of general PIS marginal fluctuations, during Marine Isotope Stage (MIS) 6 (140 to 135 ka), MIS 4 (~70 to 60 ka), and late MIS 3 to MIS 2 (~40 to 18 ka). These higher terrigenous input intervals occurred during sea-level low stands, when the west- ern PIS covered most of the Chilean fjords, which today retain glaciofluvial sediments. During these intervals, high-amplitude phases of enhanced sediment supply occur at millennial timescales, reflecting increased ice discharge most likely due to a growing PIS. We assign the late MIS 3 to MIS 2 phases and, by inference, older advances to Antarctic cold stages. We conclude that the increased sediment/meltwater release during Southern Hemisphere millennial-scale cold phases was likely related to higher precipitation caused by enhanced westerly winds at the northwestern margin of the PIS. Our records com- plement terrestrial archives and provide evidence for PIS climate sensitivity Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Max Planck Society: MPG.PuRe |
institution |
Open Polar |
collection |
Max Planck Society: MPG.PuRe |
op_collection_id |
ftpubman |
language |
English |
description |
Terrestrial glacial records from the Patagonian Andes and New Zealand Alps docu- ment quasi-synchronous Southern Hemisphere–wide glacier advances during the late Quaternary. However, these records are inherently incomplete. Here, we provide a contin- uous marine record of western–central Patagonian ice sheet (PIS) extent over a complete glacial–interglacial cycle back into the penultimate glacial (~140 ka). Sediment core MR16-09 PC03, located at 46°S and ~150 km offshore Chile, received high terrestrial sediment and meltwater input when the central PIS extended westward. We use biomark- ers, foraminiferal oxygen isotopes, and major elemental data to reconstruct terrestrial sediment and freshwater input related to PIS variations. Our sediment record documents three intervals of general PIS marginal fluctuations, during Marine Isotope Stage (MIS) 6 (140 to 135 ka), MIS 4 (~70 to 60 ka), and late MIS 3 to MIS 2 (~40 to 18 ka). These higher terrigenous input intervals occurred during sea-level low stands, when the west- ern PIS covered most of the Chilean fjords, which today retain glaciofluvial sediments. During these intervals, high-amplitude phases of enhanced sediment supply occur at millennial timescales, reflecting increased ice discharge most likely due to a growing PIS. We assign the late MIS 3 to MIS 2 phases and, by inference, older advances to Antarctic cold stages. We conclude that the increased sediment/meltwater release during Southern Hemisphere millennial-scale cold phases was likely related to higher precipitation caused by enhanced westerly winds at the northwestern margin of the PIS. Our records com- plement terrestrial archives and provide evidence for PIS climate sensitivity |
author2 |
Davies, B. |
format |
Article in Journal/Newspaper |
author |
Hagemann, J. Lamy, F. Arzd, H. Lembke-Jene, L. Auderset, A. Harada, N. Ho, S. Iwasaki, S. Kaiser, J. Lange, C. Murayama, M. Nagashima, K. Nowaczyk, N. Martinez-Garcia, A. Tiedemann, R. |
spellingShingle |
Hagemann, J. Lamy, F. Arzd, H. Lembke-Jene, L. Auderset, A. Harada, N. Ho, S. Iwasaki, S. Kaiser, J. Lange, C. Murayama, M. Nagashima, K. Nowaczyk, N. Martinez-Garcia, A. Tiedemann, R. A marine record of Patagonian ice sheet changes over the past 140,000 years |
author_facet |
Hagemann, J. Lamy, F. Arzd, H. Lembke-Jene, L. Auderset, A. Harada, N. Ho, S. Iwasaki, S. Kaiser, J. Lange, C. Murayama, M. Nagashima, K. Nowaczyk, N. Martinez-Garcia, A. Tiedemann, R. |
author_sort |
Hagemann, J. |
title |
A marine record of Patagonian ice sheet changes over the past 140,000 years |
title_short |
A marine record of Patagonian ice sheet changes over the past 140,000 years |
title_full |
A marine record of Patagonian ice sheet changes over the past 140,000 years |
title_fullStr |
A marine record of Patagonian ice sheet changes over the past 140,000 years |
title_full_unstemmed |
A marine record of Patagonian ice sheet changes over the past 140,000 years |
title_sort |
marine record of patagonian ice sheet changes over the past 140,000 years |
publishDate |
2024 |
url |
http://hdl.handle.net/21.11116/0000-000F-213E-7 |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
Proceedings of the National Academy of Sciences of the United States of America |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.230298312 http://hdl.handle.net/21.11116/0000-000F-213E-7 |
op_doi |
https://doi.org/10.1073/pnas.230298312 |
_version_ |
1797589635644260352 |