DOI: 10.1175/JCLI-D-15-0527.1
Scopus记录号: 2-s2.0-84977482473
论文题名: Atmospheric conditions associated with Labrador Sea deep convection: New insights from a case study of the 2006/07 and 2007/08 winters
作者: Kim W.M. ; Yeager S. ; Chang P. ; Danabasoglu G.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 14 起始页码: 5281
结束页码: 5297
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric thermodynamics
; Nickel
; Oceanography
; Storms
; Atmosphere-ocean interactions
; Deep convection
; Extratropical cyclones
; Meridional overturning circulations
; North Atlantic oscillations
; Oceanic mixed layers
; Natural convection
; air-sea interaction
; atmospheric circulation
; cyclone
; extratropical environment
; mixed layer
; North Atlantic Oscillation
; oceanic convection
; winter
; Atlantic Ocean
; Atlantic Ocean (North)
; Labrador Sea
; North America
英文摘要: Deep convection in the Labrador Sea (LS) resumed in the winter of 2007/08 under a moderately positive North Atlantic Oscillation (NAO) state. This is in sharp contrast with the previous winter with weak convection, despite a similar positive NAO state. This disparity is explored here by analyzing reanalysis data and forced-ocean simulations. It is found that the difference in deep convection is primarily due to differences in large-scale atmospheric conditions that are not accounted for by the conventional NAO definition. Specifically, the 2007/08 winter was characterized by an atmospheric circulation anomaly centered in the western North Atlantic, rather than the eastern North Atlantic that the conventional NAO emphasizes. This anomalous circulation was also accompanied by anomalously cold conditions over northern North America. The controlling influence of these atmospheric conditions on LS deep convection in the 2008 winter is confirmed by sensitivity experiments where surface forcing and/or initial conditions are modified. An extended analysis for the 1949-2009 period shows that about half of the winters with strong heat losses in the LS are associated with such a west-centered circulation anomaly and cold conditions over northern North America. These are found to be accompanied by La Niña-like conditions in the tropical Pacific, suggesting that the atmospheric response to La Niña may have a strong influence on LS deep convection. © 2016 American Meteorological Society. 资助项目: NSF, Norwegian Nurses Organisation
; NSF, Norwegian Nurses Organisation
; NOAA, National Oceanic and Atmospheric Administration
; NOAA, National Oceanic and Atmospheric Administration
; NOAA, National Oceanic and Atmospheric Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50225
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Oceanography, Texas A and M University, College Station, TX, United States; National Center for Atmospheric Research, Boulder, CO, United States; Qingdao Collaborative Innovation Center of Marine Science and Technology, Ocean University of China, Qingdao, China
Recommended Citation:
Kim W.M.,Yeager S.,Chang P.,et al. Atmospheric conditions associated with Labrador Sea deep convection: New insights from a case study of the 2006/07 and 2007/08 winters[J]. Journal of Climate,2016-01-01,29(14)