DOI: 10.1002/2015JD024254
论文题名: Troposphere-stratosphere dynamical coupling in the southern high latitudes and its linkage to the Amundsen Sea
作者: England M.R. ; Shaw T.A. ; Polvani L.M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 8 起始页码: 3776
结束页码: 3789
语种: 英语
英文关键词: Amundsen Sea Low
; planetary-scale waves
; stratosphere-troposphere coupling
Scopus关键词: air-sea interaction
; atmospheric circulation
; climate modeling
; heat flux
; latitude
; Northern Hemisphere
; planetary wave
; sea level pressure
; Southern Hemisphere
; stratosphere-troposphere interaction
; Amundsen Sea
; Antarctic Peninsula
; Antarctica
; Bellingshausen Sea
; Southern Ocean
; West Antarctica
英文摘要: Extremes in the distribution of Southern Hemisphere stratospheric heat flux are connected simultaneously to anomalous high-latitude tropospheric weather patterns in reanalysis, consistent with results from the Northern Hemisphere. The dynamical links are revealed using a metric based on extreme stratospheric planetary-scale wave heat flux events, defined as the 10th and 90th percentiles of the daily high-latitude wave 1 heat flux distribution at 50 hPa. We show extreme negative (positive) heat flux events are linked to a westward (eastward) shift in the Amundsen Sea Low and anomalous warming (cooling) over the Amundsen Bellingshausen Seas in reanalysis data. Since coupling to the stratosphere via planetary waves has significant impacts on the tropospheric circulation of both hemispheres, it is important to understand which coupled climate models can reproduce this phenomenon. The heat flux metric is used to evaluate troposphere-stratosphere coupling in models participating in the Coupled Model Intercomparison Project Phase 5 (CMIP5) and compare their performance across hemispheres. The results show that models with a degraded representation of stratospheric extremes exhibit robust biases in tropospheric sea level pressure variability over the Antarctic Peninsula. Models which fail to capture the extremes in stratospheric heat flux, significantly underestimate the variance of the distribution of mean sea level pressure anomalies over Western Antarctica. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62898
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY, United States; Department of the Geophysical Sciences, University of Chicago, Chicago, IL, United States; Department of Earth and Environmental Science, Lamont-Doherty Earth Observatory, Columbia University, New York, NY, United States
Recommended Citation:
England M.R.,Shaw T.A.,Polvani L.M.. Troposphere-stratosphere dynamical coupling in the southern high latitudes and its linkage to the Amundsen Sea[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(8)