DOI: 10.1175/JCLI-D-13-00779.1
Scopus记录号: 2-s2.0-84904511883
论文题名: Linking Siberian snow cover to precursors of stratospheric variability
作者: Cohen J. ; Furtado J.C. ; Jones J. ; Barlow M. ; Whittleston D. ; Entekhabi D.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 14 起始页码: 5422
结束页码: 5432
语种: 英语
Scopus关键词: Heat flux
; Sea level
; Upper atmosphere
; Arctic Oscillation
; Climate prediction
; Intraseasonal variability
; Seasonal forecasting
; Stratospheric circulations
; Snow
; Arctic Oscillation
; heat flux
; meridional circulation
; sea level pressure
; snow cover
; stratosphere-troposphere interaction
; wave climate
; Siberia
英文摘要: Previous research has linked wintertime Arctic Oscillation (AO) variability to indices of Siberian snow cover and upward wave activity flux in the preceding fall season. Here, daily data are used to examine the surface and tropospheric processes that occur as the link between snow cover and upward forcing into the stratosphere develops. October Eurasian mean snow cover is found to be significantly related to sea level pressure (SLP) and to lower-stratosphere (100 hPa) meridional heat flux. Analysis of daily SLP and 100-hPa heat flux shows that in years with high October snow, the SLP is significantly higher from approximately 1 November to 15 December, and the 100-hPa heat flux is significantly increased with a two-week lag, from approximately 15 November to 31 December. During November-December, there are periods with upward wave activity flux extending coherently from the surface to the stratosphere, and these events occur nearly twice as often in high snow years compared to low snow years. The vertical structure of these events is a westward-tilting pattern of high eddy heights, with the largest normalized anomalies near the surface in the same region as the snow and SLP changes. These results suggest that high SLP develops in response to the snow cover and this higher pressure, in turn, provides part of the structure of a surface-to-stratosphere wave activity flux event, thus making full events more likely. Implications for improved winter forecasts exist through recognition of these precursor signals. © 2014 American Meteorological Society. 资助项目: NSF, National Oceanic and Atmospheric Administration
; NSF, 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/51461
Appears in Collections: 气候变化事实与影响
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作者单位: Atmospheric and Environmental Research, Lexington, MA, United States; Department of Environmental, Earth, and Atmospheric Sciences, University of Massachusetts Lowell, Lowell, MA, United States; Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
Recommended Citation:
Cohen J.,Furtado J.C.,Jones J.,et al. Linking Siberian snow cover to precursors of stratospheric variability[J]. Journal of Climate,2014-01-01,27(14)