A Seasonally Delayed Sea Ice Response and Arctic Amplification During the Last Glacial Inception
Abstract The last glacial inception (LGI) marks the transition from the interglacial warm climate to the glacial period with extensive Northern Hemisphere ice sheets and colder climate. This transition is initiated by decreasing boreal summer insolation but requires positive feedbacks to stimulate t...
| 出版年: | Geophysical Research Letters |
|---|---|
| 主要な著者: | , , |
| フォーマット: | 論文 |
| 言語: | 英語 |
| 出版事項: |
Wiley
2024-06-01
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| 主題: | |
| オンライン･アクセス: | https://doi.org/10.1029/2023GL107927 |
| _version_ | 1849486284257492992 |
|---|---|
| author | Shan Xu Uta Krebs‐Kanzow Gerrit Lohmann |
| author_facet | Shan Xu Uta Krebs‐Kanzow Gerrit Lohmann |
| author_sort | Shan Xu |
| collection | DOAJ |
| container_title | Geophysical Research Letters |
| description | Abstract The last glacial inception (LGI) marks the transition from the interglacial warm climate to the glacial period with extensive Northern Hemisphere ice sheets and colder climate. This transition is initiated by decreasing boreal summer insolation but requires positive feedbacks to stimulate the appearance of perennial snow. We perform simulations of LGI with climate model AWI‐ESM‐2.1, forced by the astronomical and greenhouse gas forcing of 115,000 years before present. To compare with the preindustrial (PI) simulation, we use a consistent definition of the seasons during the LGI and the PI and evaluate model output on an angular astronomical calendar. Our study reveals a prominent role of the sea‐ice albedo feedback to amplify the delayed climate signal at polar latitudes. Through a radiative budget analysis, we examine that the ice‐albedo feedback exceeds the shortwave radiative forcing, contributing to the cooling and high latitude snow built‐up during LGI. |
| format | Article |
| id | doaj-art-e6a8a98890be42e1964fda9e20320f6a |
| institution | Directory of Open Access Journals |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-06-01 |
| publisher | Wiley |
| record_format | Article |
| spelling | doaj-art-e6a8a98890be42e1964fda9e20320f6a2025-08-20T03:10:21ZengWileyGeophysical Research Letters0094-82761944-80072024-06-015112n/an/a10.1029/2023GL107927A Seasonally Delayed Sea Ice Response and Arctic Amplification During the Last Glacial InceptionShan Xu0Uta Krebs‐Kanzow1Gerrit Lohmann2Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research Bremerhaven GermanyAlfred Wegener Institute Helmholtz Centre for Polar and Marine Research Bremerhaven GermanyAlfred Wegener Institute Helmholtz Centre for Polar and Marine Research Bremerhaven GermanyAbstract The last glacial inception (LGI) marks the transition from the interglacial warm climate to the glacial period with extensive Northern Hemisphere ice sheets and colder climate. This transition is initiated by decreasing boreal summer insolation but requires positive feedbacks to stimulate the appearance of perennial snow. We perform simulations of LGI with climate model AWI‐ESM‐2.1, forced by the astronomical and greenhouse gas forcing of 115,000 years before present. To compare with the preindustrial (PI) simulation, we use a consistent definition of the seasons during the LGI and the PI and evaluate model output on an angular astronomical calendar. Our study reveals a prominent role of the sea‐ice albedo feedback to amplify the delayed climate signal at polar latitudes. Through a radiative budget analysis, we examine that the ice‐albedo feedback exceeds the shortwave radiative forcing, contributing to the cooling and high latitude snow built‐up during LGI.https://doi.org/10.1029/2023GL107927climate modelsglacial inceptionsea icepaleoclimate calendar |
| spellingShingle | Shan Xu Uta Krebs‐Kanzow Gerrit Lohmann A Seasonally Delayed Sea Ice Response and Arctic Amplification During the Last Glacial Inception climate models glacial inception sea ice paleoclimate calendar |
| title | A Seasonally Delayed Sea Ice Response and Arctic Amplification During the Last Glacial Inception |
| title_full | A Seasonally Delayed Sea Ice Response and Arctic Amplification During the Last Glacial Inception |
| title_fullStr | A Seasonally Delayed Sea Ice Response and Arctic Amplification During the Last Glacial Inception |
| title_full_unstemmed | A Seasonally Delayed Sea Ice Response and Arctic Amplification During the Last Glacial Inception |
| title_short | A Seasonally Delayed Sea Ice Response and Arctic Amplification During the Last Glacial Inception |
| title_sort | seasonally delayed sea ice response and arctic amplification during the last glacial inception |
| topic | climate models glacial inception sea ice paleoclimate calendar |
| url | https://doi.org/10.1029/2023GL107927 |
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