Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP)
The penultimate glacial maximum (PGM, ≈140 kyrs BP), is known to be the most extensive glaciation on record that occurred during the last 400 kyrs over Eurasia. We used a coupled Atmosphere-Ocean-Sea-Ice-Land model to simulate the climate of the PGM accounting for a reconstruction of the large PGM E...
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ftawi:oai:epic.awi.de:40251 2023-05-15T15:12:11+02:00 Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) Colleoni, Florence Wekerle, Claudia Näslund, Jens-Ove Brandefelt, Jenny Masina, Simona 2016-04-01 https://epic.awi.de/id/eprint/40251/ https://doi.org/10.1016/j.quascirev.2016.01.024 https://hdl.handle.net/10013/epic.47540 unknown Colleoni, F. , Wekerle, C. orcid:0000-0001-9985-0950 , Näslund, J. O. , Brandefelt, J. and Masina, S. (2016) Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) , Quaternary Science Reviews, 137 , pp. 97-112 . doi:10.1016/j.quascirev.2016.01.024 <https://doi.org/10.1016/j.quascirev.2016.01.024> , hdl:10013/epic.47540 EPIC3Quaternary Science Reviews, 137, pp. 97-112 Article isiRev 2016 ftawi https://doi.org/10.1016/j.quascirev.2016.01.024 2021-12-24T15:41:21Z The penultimate glacial maximum (PGM, ≈140 kyrs BP), is known to be the most extensive glaciation on record that occurred during the last 400 kyrs over Eurasia. We used a coupled Atmosphere-Ocean-Sea-Ice-Land model to simulate the climate of the PGM accounting for a reconstruction of the large PGM Eurasian ice sheet. Due to uncertainties in the PGM Laurentide ice-sheet topography, two simulations with different ice-sheet topographies over North America (large as for the Last Glacial Maximum, LGM and small as for 13 kyrs BP) are performed. Results show that the simulated PGM glacial maximum climates are of comparable magnitude with previous simulations of the LGM in both cases. Assuming a small Laurentide ice-sheet instead of the LGM one in our PGM simulations results in a shift in the planetary waves. This causes an increase in storm track activity over the North Atlantic as well as higher temperatures and precipitation rates over North America, North Atlantic and over the Eurasian ice sheet. In addition, it induces a negative temperature anomaly over East Siberia yielding a thick snow cover, which seems to be in agreement with data from recent Arctic campaigns suggesting that an ice cap developed over Beringia during the PGM. All together, the changes in large-scale circulation and regional climate simulated using a small Laurentide ice sheet match the proxies well. Based on our findings, we suggest that the Laurentide ice sheet might have been smaller during the PGM than during the LGM, in turn also implying a larger Eurasian ice sheet than during the LGM, which is supported by various geological evidence of the PGM. Article in Journal/Newspaper Arctic Ice cap Ice Sheet North Atlantic Sea ice Beringia Siberia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Quaternary Science Reviews 137 97 112 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The penultimate glacial maximum (PGM, ≈140 kyrs BP), is known to be the most extensive glaciation on record that occurred during the last 400 kyrs over Eurasia. We used a coupled Atmosphere-Ocean-Sea-Ice-Land model to simulate the climate of the PGM accounting for a reconstruction of the large PGM Eurasian ice sheet. Due to uncertainties in the PGM Laurentide ice-sheet topography, two simulations with different ice-sheet topographies over North America (large as for the Last Glacial Maximum, LGM and small as for 13 kyrs BP) are performed. Results show that the simulated PGM glacial maximum climates are of comparable magnitude with previous simulations of the LGM in both cases. Assuming a small Laurentide ice-sheet instead of the LGM one in our PGM simulations results in a shift in the planetary waves. This causes an increase in storm track activity over the North Atlantic as well as higher temperatures and precipitation rates over North America, North Atlantic and over the Eurasian ice sheet. In addition, it induces a negative temperature anomaly over East Siberia yielding a thick snow cover, which seems to be in agreement with data from recent Arctic campaigns suggesting that an ice cap developed over Beringia during the PGM. All together, the changes in large-scale circulation and regional climate simulated using a small Laurentide ice sheet match the proxies well. Based on our findings, we suggest that the Laurentide ice sheet might have been smaller during the PGM than during the LGM, in turn also implying a larger Eurasian ice sheet than during the LGM, which is supported by various geological evidence of the PGM. |
format |
Article in Journal/Newspaper |
author |
Colleoni, Florence Wekerle, Claudia Näslund, Jens-Ove Brandefelt, Jenny Masina, Simona |
spellingShingle |
Colleoni, Florence Wekerle, Claudia Näslund, Jens-Ove Brandefelt, Jenny Masina, Simona Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) |
author_facet |
Colleoni, Florence Wekerle, Claudia Näslund, Jens-Ove Brandefelt, Jenny Masina, Simona |
author_sort |
Colleoni, Florence |
title |
Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) |
title_short |
Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) |
title_full |
Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) |
title_fullStr |
Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) |
title_full_unstemmed |
Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) |
title_sort |
constraint on the penultimate glacial maximum northern hemisphere ice topography (≈140 kyrs bp) |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/40251/ https://doi.org/10.1016/j.quascirev.2016.01.024 https://hdl.handle.net/10013/epic.47540 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice cap Ice Sheet North Atlantic Sea ice Beringia Siberia |
genre_facet |
Arctic Ice cap Ice Sheet North Atlantic Sea ice Beringia Siberia |
op_source |
EPIC3Quaternary Science Reviews, 137, pp. 97-112 |
op_relation |
Colleoni, F. , Wekerle, C. orcid:0000-0001-9985-0950 , Näslund, J. O. , Brandefelt, J. and Masina, S. (2016) Constraint on the penultimate glacial maximum Northern Hemisphere ice topography (≈140 kyrs BP) , Quaternary Science Reviews, 137 , pp. 97-112 . doi:10.1016/j.quascirev.2016.01.024 <https://doi.org/10.1016/j.quascirev.2016.01.024> , hdl:10013/epic.47540 |
op_doi |
https://doi.org/10.1016/j.quascirev.2016.01.024 |
container_title |
Quaternary Science Reviews |
container_volume |
137 |
container_start_page |
97 |
op_container_end_page |
112 |
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1766342904859590656 |