DOI: 10.1175/JCLI-D-16-0214.1
Scopus记录号: 2-s2.0-85017512213
论文题名: Impact of Eurasian spring snow decrement on East Asian summer precipitation
作者: Zhang R. ; Zhang R. ; Zuo Z.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 9 起始页码: 3421
结束页码: 3437
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate change
; Fluxes
; Heat flux
; Precipitation (meteorology)
; Rain
; Snow
; Soil moisture
; Surface properties
; Atmosphere-land interactions
; Climate variability
; Community atmospheric model
; Meridional temperature gradient
; Near surface temperature
; Snow covers
; Summer precipitation
; Westerly jet streams
; Fighter aircraft
英文摘要: In this study, the relationship between Eurasian spring snow decrement (SSD) and East Asian summer precipitation and related mechanisms were investigated using observational data and the Community Atmospheric Model, version 3.1 (CAM3.1). The results show that a west-east dipole pattern in Eurasian SSD anomalies, with a negative center located in the region between eastern Europe and the West Siberia Plain (EEWSP) and a positive center located around Baikal Lake (BL), is significantly associated with East Asian summer precipitation via triggering an anomalous midlatitude Eurasian wave train. Reduced SSD over EEWSP corresponds to anomalously dry local soil conditions from spring to the following summer, thereby increasing surface heat flux and near-surface temperatures. Similarly, the increase in SSD over BL is accompanied by anomalously low near-surface temperatures. The near-surface thermal anomalies cause an anomalous meridional temperature gradient, which intensifies the lower-level baroclinicity and causes an acceleration of the subtropical westerly jet stream, leading to an enhanced and maintained Eurasian wave train. Additionally, the atmospheric response to changed surface thermal conditions tends to simultaneously increase the local 1000-500-hPa thickness, which further enhances the Eurasian wave train. Consequently, significant wave activity flux anomalies spread from eastern Europe eastward to East Asia and significantly influence the summer precipitation over China, with more rainfall over northeastern China and the Yellow River valley and less rainfall over Inner Mongolia and southern China. © 2017 American Meteorological Society. 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49692
Appears in Collections: 气候变化事实与影响
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作者单位: Chinese Academy of Meteorological Sciences, Beijing, China; National Climate Center, China Meteorological Administration, Beijing, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China
Recommended Citation:
Zhang R.,Zhang R.,Zuo Z.. Impact of Eurasian spring snow decrement on East Asian summer precipitation[J]. Journal of Climate,2017-01-01,30(9)