| DOI: | 10.1002/2016GL071012
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| 论文题名: | On the limited ice intrusion in Alaska at the LGM |
| 作者: | Löfverström M.; Liakka J.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8463
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| EISSN: | 1944-8194
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| 出版年: | 2016
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| 卷: | 43, 期:20 | | 起始页码: | 11030
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| 结束页码: | 11038
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| 语种: | 英语
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| 英文关键词: | atmosphere-ice sheet interactions
; atmospheric modeling
; radiative feedbacks
; thermally and mechanically forced stationary waves
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| Scopus关键词: | Atmospheric temperature
; Glaciers
; Oceanography
; Surface waters
; Atmospheric circulation model
; Atmospheric model
; Ice sheet
; Last Glacial Maximum
; Laurentide ice sheets
; Sea surface temperatures
; Short-wave radiation
; Stationary waves
; Ice
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| 英文摘要: | The Last Glacial Maximum (LGM) Laurentide Ice Sheet covered most of the North American continent poleward of 40°N, with the exception of Alaska that remained relatively warm, dry, and largely ice free. Experiments with a global atmospheric circulation model are in broad agreement with proxies: the Alaskan summer temperatures are comparable to the preindustrial, and the annual precipitation is reduced by 30–50%. The warm conditions are attributed to a lowering of the local planetary albedo—due to a decreased cloudiness in response to the cold LGM sea surface temperatures (SSTs) and a stationary anticyclone forced by the ice sheet—that allows more shortwave radiation to reach the surface. Stationary waves are shown to counteract the shortwave cloud feedback by converging less heat over the target region. The LGM SST field also yields an equatorward shifted Pacific stormtrack, which results in drier conditions in Alaska and abundant precipitation at the southern margin of the Laurentide Ice Sheet. ©2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84995653358&doi=10.1002%2f2016GL071012&partnerID=40&md5=a9191e735eed9927ccc682bcd8867772
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| Citation statistics: |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/9426
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | National Center for Atmospheric Research, Boulder, CO, United States
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| Recommended Citation: | |
Löfverström M.,Liakka J.. On the limited ice intrusion in Alaska at the LGM[J]. Geophysical Research Letters,2016-01-01,43(20).
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