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DOI | 10.1002/2017GL074274 |
Abrupt regime shifts in the North Atlantic atmospheric circulation over the last deglaciation | |
Lofverstrom, Marcus1; Lora, Juan M.2 | |
2017-08-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:15 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | We analyze modeling results of the North Atlantic atmospheric winter circulation from a transient climate simulation over the last 21,000 years. In agreement with previous studies, we find that the midlatitude jet stream assumes a strong, stable, and zonal disposition so long as the North American ice sheets remain in their continent-wide Last Glacial Maximum (LGM) configuration. However, when the Laurentide ice sheet (LIS) and Cordilleran ice sheet separate (similar to 14,000 years ago), the jet stream abruptly changes to a tilted circulation regime, similar to modern. The proposed explanation is that the dominant stationary wave source in the North Atlantic sector changes from the LIS to the Cordilleran mountain range during the saddle collapse. As long as the LIS dominates, the circulation retains the zonal LGM state characterized by prevalent stationary wave reflection in the subtropical North Atlantic. When the Cordillera takes over, the circulation acquires its modern disposition with a weak and meridionally tilted jet stream and storm track. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000408379000055 |
WOS关键词 | LAURENTIDE ICE-SHEET ; EDDY-DRIVEN JET ; MAXIMUM CLIMATE SIMULATIONS ; SEA-SURFACE TEMPERATURES ; GLACIAL MAXIMUM ; WAVE-BREAKING ; STATIONARY WAVES ; SEASONAL CYCLE ; MODEL ; LGM |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28220 |
专题 | 气候变化 |
作者单位 | 1.Nat Ctr Atmospher Res, Boulder, CO 80305 USA; 2.Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA USA |
推荐引用方式 GB/T 7714 | Lofverstrom, Marcus,Lora, Juan M.. Abrupt regime shifts in the North Atlantic atmospheric circulation over the last deglaciation[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(15). |
APA | Lofverstrom, Marcus,&Lora, Juan M..(2017).Abrupt regime shifts in the North Atlantic atmospheric circulation over the last deglaciation.GEOPHYSICAL RESEARCH LETTERS,44(15). |
MLA | Lofverstrom, Marcus,et al."Abrupt regime shifts in the North Atlantic atmospheric circulation over the last deglaciation".GEOPHYSICAL RESEARCH LETTERS 44.15(2017). |
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