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DOI | 10.1007/s00382-018-4111-9 |
Holocene lowering of the Laurentide ice sheet affects North Atlantic gyre circulation and climate | |
Gregoire, Lauren J.1; Ivanovic, Ruza F.1; Maycock, Amanda C.1; Valdes, Paul J.2; Stevenson, Samantha3 | |
2018-11-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 51页码:3797-3813 |
文章类型 | Article |
语种 | 英语 |
国家 | England; USA |
英文摘要 | The Laurentide ice sheet, which covered Canada during glacial periods, had a major influence on atmospheric circulation and surface climate, but its role in climate during the early Holocene (9-7 ka), when it was thinner and confined around Hudson Bay, is unclear. It has been suggested that the demise of the ice sheet played a role in the 8.2 ka event (an abrupt 1-3 degrees C Northern Hemisphere cooling lasting similar to 160 years) through the influence of changing topography on atmospheric circulation. To test this hypothesis, and to investigate the broader implications of changing ice sheet topography for climate, we analyse a set of equilibrium climate simulations with ice sheet topographies taken at 500 year intervals from 9.5 to 8.0 ka. Between 9.5 and 8.0 ka, our simulations show a 2 degrees C cooling south of Iceland and a 1 degrees C warming between 40 degrees and 50 degrees N in the North Atlantic. These surface temperature changes are associated with a weakening of the subtropical and subpolar gyres caused by a decreasing wind stress curl over the mid-North Atlantic as the ice sheet lowers. The climate response is strongest during the period of peak ice volume change (9.5-8.5 ka), but becomes negligible after 8.5 ka. The climatic effects of the Laurentide ice sheet lowering during the Holocene are restricted to the North Atlantic sector. Thus, topographic forcing is unlikely to have played a major role in the 8.2 ka event and had only a small effect on Holocene climate change compared to the effects of changes in greenhouse gases, insolation and ice sheet meltwater. |
英文关键词 | Ice sheet topography Holocene Atmospheric circulation Wind driven Ocean circulation Laurentide Ice sheet 8.2 kyr event |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000447366100036 |
WOS关键词 | LAST GLACIAL MAXIMUM ; ATMOSPHERIC CIRCULATION ; STATIONARY WAVES ; HEINRICH EVENTS ; MODEL ; DEGLACIATION ; IMPACT ; CORE ; SIMULATIONS ; TOPOGRAPHY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
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/35690 |
专题 | 气候变化 |
作者单位 | 1.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England; 2.Univ Bristol, Sch Geog Sci, Bristol BS8 1SS, Avon, England; 3.Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA |
推荐引用方式 GB/T 7714 | Gregoire, Lauren J.,Ivanovic, Ruza F.,Maycock, Amanda C.,et al. Holocene lowering of the Laurentide ice sheet affects North Atlantic gyre circulation and climate[J]. CLIMATE DYNAMICS,2018,51:3797-3813. |
APA | Gregoire, Lauren J.,Ivanovic, Ruza F.,Maycock, Amanda C.,Valdes, Paul J.,&Stevenson, Samantha.(2018).Holocene lowering of the Laurentide ice sheet affects North Atlantic gyre circulation and climate.CLIMATE DYNAMICS,51,3797-3813. |
MLA | Gregoire, Lauren J.,et al."Holocene lowering of the Laurentide ice sheet affects North Atlantic gyre circulation and climate".CLIMATE DYNAMICS 51(2018):3797-3813. |
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