globalchange  > 气候变化事实与影响
DOI: 10.1175/JCLI-D-14-00525.1
Scopus记录号: 2-s2.0-84938767917
论文题名:
North Atlantic eddy-driven jet in interglacial and glacial winter climates
作者: Merz N.; Raible C.C.; Woollings T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期:10
起始页码: 3977
结束页码: 3997
语种: 英语
Scopus关键词: Atmospheric movements ; Boundary conditions ; Glacial geology ; Momentum ; Atmospheric waves ; Bias correction ; Early Holocene ; Laurentide ice sheets ; Multi-modality ; State of the art ; Stationary waves ; Westerly winds ; Climate models ; atmospheric wave ; boundary condition ; climate modeling ; climate variation ; eddy ; Eemian ; glacial-interglacial cycle ; Holocene ; jet flow ; Laurentide Ice Sheet ; momentum ; westerly ; Atlantic Ocean ; Atlantic Ocean (North)
英文摘要: The atmospheric westerly flow in the North Atlantic (NA) sector is dominated by atmospheric waves or eddies generating via momentum flux convergence, the so-called eddy-driven jet. The position of this jet is variable and shows for the present-day winter climate three preferred latitudinal states: a northern, central, and southern position in the NA. Here, the authors analyze the behavior of the eddy-driven jet under different glacial and interglacial boundary conditions using atmosphere-land-only simulations with the CCSM4 climate model. As state-of-the-art climate models tend to underestimate the trimodality of the jet latitude, the authors apply a bias correction and successfully extract the trimodal behavior of the jet within CCSM4. The analysis shows that during interglacial times (i.e., the early Holocene and the Eemian) the preferred jet positions are rather stable and the observed multimodality is the typical interglacial character of the jet. During glacial times, the jet is strongly enhanced, its position is shifted southward, and the trimodal behavior vanishes. This is mainly due to the presence of the Laurentide ice sheet (LIS). The LIS enhances stationary waves downstream, thereby accelerating and displacing the NA eddy-driven jet by anomalous stationary momentum flux convergence. Additionally, changes in the transient eddy activity caused by topography changes as well as other glacial boundary conditions lead to an acceleration of the westerly winds over the southernNAat the expense of more northern areas. Consequently, both stationary and transient eddies foster the southward shift of the NA eddy-driven jet during glacial winter times. © 2015 American Meteorological Society.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50910
Appears in Collections:气候变化事实与影响

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作者单位: Climate and Environmental Physics, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Atmospheric Physics, Clarendon Laboratory, Oxford, United Kingdom

Recommended Citation:
Merz N.,Raible C.C.,Woollings T.. North Atlantic eddy-driven jet in interglacial and glacial winter climates[J]. Journal of Climate,2015-01-01,28(10)
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