globalchange  > 气候变化与战略
DOI: 10.1175/JCLI-D-16-0762.1
Scopus记录号: 2-s2.0-85019163983
论文题名:
Changes in North American atmospheric circulation and extreme weather: Influence of arctic amplification and northern hemisphere snow cover
作者: Vavrus S.J.; Wang F.; Martin J.E.; Francis J.A.; Peings Y.; Cattiaux J.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期:11
起始页码: 4317
结束页码: 4333
语种: 英语
Scopus关键词: Climate models ; Climatology ; Earth atmosphere ; Global warming ; Meteorology ; Sea ice ; Specific heat ; Wind ; Arctic ; Atmospheric circulation ; Earth system model ; Geo-potential heights ; North America ; Northern Hemispheres ; Seasonal differences ; Snow covers ; Snow
英文摘要: This study tests the hypothesis that Arctic amplification (AA) of global warming remotely affects midlatitudes by promoting a weaker, wavier atmospheric circulation conducive to extreme weather. The investigation is based on the late twenty-first century over greater North America (20°-90°N, 50°-160°W) using 40 simulations from the Community Earth System Model Large Ensemble, spanning 1920-2100. AA is found to promote regionally varying ridging aloft (500 hPa) with strong seasonal differences reflecting the location of the strongest surface thermal forcing. During winter, maximum increases in future geopotential heights are centered over the Arctic Ocean, in conjunction with sea ice loss, but minimum height increases (troughing) occur to the south, over the continental United States. During summer the location of maximum height inflation shifts equatorward, forming an annular band across mid-to-high latitudes of the entire Northern Hemisphere. This band spans the continents, whose enhanced surface heating is aided by antecedent snow-cover loss and reduced terrestrial heat capacity. Through the thermal wind relationship, midtropospheric winds weaken on the equatorward flank of both seasonal ridging anomalies-mainly over Canada during winter and even more over the continental United States during summer-but strengthen elsewhere to form a dipole anomaly pattern in each season. Changes in circulation waviness, expressed as sinuosity, are inversely correlated with changes in zonal wind speed at nearly all latitudes, both in the projections and as observed during recent decades. Over the central United States during summer, the weaker and wavier flow promotes drying and enhanced heating, thus favoring more intense summer weather. © 2017 American Meteorological Society.
资助项目: NSF, National Science Foundation ; NSF, National Science Foundation ; NSF, National Science Foundation ; NSF, National Science Foundation ; NSF, National Science Foundation
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/48882
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Nelson Institute Center for Climatic Research, University of Wisconsin-Madison, Madison, WI, United States; Department of Atmospheric and Oceanic Sciences, University of Wisconsin-Madison, Madison, WI, United States; Department of Marine and Coastal Studies, Rutgers, The State University of New Jersey, New Brunswick, NJ, United States; Department of Earth Systems Science, University of California, Irvine, Irvine, CA, United States; Centre National de Recherches Météorologiques, UMR 3589 CNRS/Meteo-France, Toulouse, France

Recommended Citation:
Vavrus S.J.,Wang F.,Martin J.E.,et al. Changes in North American atmospheric circulation and extreme weather: Influence of arctic amplification and northern hemisphere snow cover[J]. Journal of Climate,2017-01-01,30(11)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Vavrus S.J.]'s Articles
[Wang F.]'s Articles
[Martin J.E.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Vavrus S.J.]'s Articles
[Wang F.]'s Articles
[Martin J.E.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Vavrus S.J.]‘s Articles
[Wang F.]‘s Articles
[Martin J.E.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.