首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Hemispheric-scale climate response to Northern Eurasia land surface characteristics and snow anomalies
Authors:Gavin Gong  Judah Cohen  Dara Entekhabi  Yan Ge  
Institution:aDepartment of Earth and Environmental Engineering, Columbia University, 500 West 120 Street, MC4711, New York, NY 10027, United States;bAtmospheric and Environmental Research, Inc., 131 Hartwell Ave., Lexington, MA 02421, United States;cDepartment of Civil and Environmental Engineering, Massachusetts Institute of Technology, Building 48–331, Cambridge, MA 02139, United States
Abstract: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 co-location 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.
Keywords:Eurasia  snow  climate  orography
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号