DOI: 10.1007/s00382-013-1715-y
Scopus记录号: 2-s2.0-84895004204
论文题名: Simulated response to inter-annual SST variations in the Gulf Stream region
作者: Hand R. ; Keenlyside N. ; Omrani N.-E. ; Latif M.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-03-04 起始页码: 715
结束页码: 731
语种: 英语
英文关键词: Gulf Stream
; North Atlantic
; Ocean-atmosphere interaction
; SST fronts
英文摘要: Recent studies show that mid-latitude SST variations over the Kuroshio-Oyashio Extension influence the atmospheric circulation. However, the impact of variations in SST in the Gulf Stream region on the atmosphere has been less studied. Understanding the atmospheric response to such variability can improve the climate predictability in the North Atlantic Sector. Here we use a relatively high resolution (∼1°) Atmospheric General Circulation Model to investigate the mechanisms linking observed 5-year low-pass filtered SST variability in the Gulf Stream region and atmospheric variability, with focus on precipitation. Our results indicate that up to 70 % of local convective precipitation variability on these timescales can be explained by Gulf Stream SST variations. In this region, SST and convective precipitation are strongly correlated in both summer (r = 0.73) and winter (r = 0.55). A sensitivity experiment with a prescribed local warm SST anomaly in the Gulf Stream region confirms that local SST drives most of the precipitation variability over the Gulf Stream. Increased evaporation connected to the anomalous warm SST plays a crucial role in both seasons. In summer there is an enhanced local SLP minimum, a concentrated band of low level convergence, deep upward motion and enhanced precipitation. In winter we also get enhanced precipitation, but a direct connection to deep vertical upward motion is not found. Nearly all of the anomalous precipitation in winter is connected to passing atmospheric fronts. In summer the connection between precipitation and atmospheric fronts is weaker, but still important. © 2013 Springer-Verlag Berlin Heidelberg. 资助项目: DFG, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54311
Appears in Collections: 过去全球变化的重建
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany; Bjerknes Centre and Geophysical Institute, University of Bergen, Bergen, Norway
Recommended Citation:
Hand R.,Keenlyside N.,Omrani N.-E.,et al. Simulated response to inter-annual SST variations in the Gulf Stream region[J]. Climate Dynamics,2014-01-01,42(2017-03-04)