Scopus记录号: 2-s2.0-85044931169
论文题名: How autumn Eurasian snow anomalies affect east asian winter monsoon: a numerical study
作者: Luo X. ; Wang B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2019
卷: 52, 期: 2019-01-02 起始页码: 69
结束页码: 82
语种: 英语
英文关键词: Coupled climate model
; East Asian winter monsoon
; Eurasian snow cover
; Snow-monsoon feedback mechanism
; Surface albedo
Scopus关键词: Moroccan pepper virus
英文摘要: Previous studies have found that snow Eurasian anomalies in autumn can affect East Asian winter monsoon (EAWM), but the mechanisms remain controversial and not well understood. The possible mechanisms by which Eurasian autumn snow anomalies affect EAWM are investigated by numerical experiments with a coupled general circulation model and its atmospheric general circulation model component. The leading empirical orthogonal function mode of the October–November mean Eurasian snow cover is characterized by a uniform anomaly over a broad region of central Eurasia (40°N–65°N, 60°E–140°E). However, the results from a 150-ensemble mean simulation with snow depth anomaly specified in October and November reveal that the Mongolian Plateau and Vicinity (MPV, 40°–55°N, 80°–120°E) is the key region for autumn snow anomalies to affect EAWM. The excessive snow forcing can significantly enhance EAWM and the snowfall over the northwestern China and along the EAWM front zone stretching from the southeast China to Japan. The physical process involves a snow-monsoon feedback mechanism. The excessive autumn snow anomalies over the MPV region can persist into the following winter, and significantly enhance winter snow anomalies, which increase surface albedo, reduce incoming solar radiation and cool the boundary layer air, leading to an enhanced Mongolian High and a deepened East Asian trough. The latter, in turn, strengthen surface northwesterly winds, cooling East Asia and increasing snow accumulation over the MPV region and the southeastern China. The increased snow covers feedback to EAWM system through changing albedo, extending its influence southeastward. It is also found that the atmosphere–ocean coupling process can amplify the delayed influence of Eurasian snow mass anomaly on EAWM. The autumn surface albedo anomalies, however, do not have a lasting “memory” effect. Only if the albedo anomalies are artificially extended into December and January, will the EAWM be affected in a similar way as the impacts of autumn snow mass anomalies. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature. 资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/122440
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Atmospheric Sciences and Atmosphere-Ocean Research Center, University of Hawaii at Manoa, Honolulu, HI 96822, United States; Earth System Modeling Center, Nanjing University of Information Science and Technology, Nanjing, 210044, China
Recommended Citation:
Luo X.,Wang B.. How autumn Eurasian snow anomalies affect east asian winter monsoon: a numerical study[J]. Climate Dynamics,2019-01-01,52(2019-01-02)