Hemispheric-scale climate response to Northern Eurasia land surface characteristics and snow anomalies

被引:38
作者
Gong, Gavin
Cohen, Judah
Entekhabi, Dara
Ge, Yan
机构
[1] Columbia Univ, Dept Earth & Environm Engn, New York, NY 10027 USA
[2] Atmospher & Environm Res Inc, Lexington, MA 02421 USA
[3] MIT, Dept Civil & Environm Engn, Cambridge, MA 02139 USA
基金
美国国家科学基金会;
关键词
Eurasia; snow; climate; orography;
D O I
10.1016/j.gloplacha.2006.07.025
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
This paper presents a synopsis of recently published studies by the co-authors, which show that several land surface characteristics unique to Northern Eurasia are responsible for facilitating a causal relationship between autumn snow anomalies in this region and subsequent hemispheric winter climate patterns. The large size and extratropical location of the contiguous Eurasian land mass results in broad, continental-scale interannual snow cover extent and depth variations throughout autumn and winter, and corresponding diabatic heating anomalies. These surface anomalies occur in the presence of a large region of stationary wave activity, produced in part by the orographic barriers that separate northern/central Eurasia from southern/eastern Eurasia. This colocation of snow-forced anomalies and ambient wave energy is unique to Northern Eurasia, and initiates a teleconnection pathway involving stationary wave-mean flow interaction throughout the troposphere and stratosphere, ultimately resulting in a modulation of the winter Arctic Oscillation (AO). Complementary new results are also presented which show that partial snow cover extent or snow depth only anomalies in Northern Eurasia are insufficient to initiate the teleconnection pathway and produce a winter AO signal. This synopsis provides a useful interpretation of the earlier studies in the specific context of Northern Eurasia regional climate and environmental change. (C) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:359 / 370
页数:12
相关论文
共 44 条
[31]  
2
[32]  
ROBINSON DA, 1993, B AM METEOROL SOC, V74, P1689, DOI 10.1175/1520-0477(1993)074<1689:GSCMAU>2.0.CO
[33]  
2
[34]   Seasonal variability of Northern Hemisphere snow extent using visible satellite data [J].
Robinson, DA ;
Frei, A .
PROFESSIONAL GEOGRAPHER, 2000, 52 (02) :307-315
[35]   Land surface conditions over Eurasia and Indian summer monsoon rainfall [J].
Robock, A ;
Mu, MQ ;
Vinnikov, K ;
Robinson, D .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2003, 108 (D4)
[36]  
ROMANOVSKY VE, 2003, E SIBERIAN AIR GROUN
[37]  
Saito K, 2001, MON WEATHER REV, V129, P2746, DOI 10.1175/1520-0493(2001)129<2746:EOARTE>2.0.CO
[38]  
2
[39]   Summer snow extent heralding of the winter North Atlantic Oscillation [J].
Saunders, MA ;
Qian, BD ;
Lloyd-Hughes, B .
GEOPHYSICAL RESEARCH LETTERS, 2003, 30 (07) :31-1
[40]  
Wang XLL, 1997, J CLIMATE, V10, P2285, DOI 10.1175/1520-0442(1997)010<2285:STSOTA>2.0.CO