DOI: 10.1175/JCLI-D-16-0033.1
Scopus记录号: 2-s2.0-85012240074
论文题名: Relation of Eurasian snow cover and Indian summer monsoon rainfall: Importance of the delayed hydrological effect
作者: Halder S. ; Dirmeyer P.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 4 起始页码: 1273
结束页码: 1289
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Moisture
; Rain
; Sensitivity analysis
; Snow
; Snow melting systems
; Soil moisture
; Soils
; Surface measurement
; Atmosphere-land interactions
; Convective instabilities
; Hydrological response
; Indian summer monsoon rainfall
; Monsoons
; Operational forecasts
; Snowmelt
; Surface flux
; Fighter aircraft
; evaporation
; hydrological response
; monsoon
; precipitation (climatology)
; rainfall
; snow cover
; snowmelt
; soil moisture
; summer
; wind shear
; China
; Eurasia
; India
; Xizang
英文摘要: This observationally based study demonstrates the importance of the delayed hydrological response of snow cover and snowmelt over the Eurasian region and Tibet for variability of Indian summer monsoon rainfall during the first two months after onset. Using snow cover fraction and snow water equivalent data during 1967-2003, it is demonstrated that, although the snow-albedo effect is prevalent over western Eurasia, the delayed hydrological effect is strong and persistent over the eastern part. Long soil moisture memory and strong sensitivity of surface fluxes to soil moisture variations over eastern Asia and Tibet provide a mechanism for soil moisture anomalies generated by anomalies in winter and spring snowfall to affect rainfall during the initial months in summer. Dry soil moisture anomalies over the eastern Eurasian region associated with anomalous heating at the surface and midtroposphere help in anchoring of an anomalous upper-tropospheric "blocking" ridge around 100°E and its persistence. This not only leads to prolonged weakening of the subtropical westerly jet but also shifts its position southward of 30°N, followed by penetration of anomalous troughs in the westerlies into the Indian region. Simultaneously, intrusion of cold and dry air from the midlatitudes can reduce the convective instability and hence rainfall over India after the onset. Such a southward shift of the jet can also significantly weaken the vertical easterly wind shear over the Indian region in summer and lead to decrease in rainfall. This delayed hydrological effect also has the potential to modulate the snow-atmosphere coupling strength for temperature and precipitation in operational forecast models through soil moisture-evaporation-precipitation feedbacks. © 2017 American Meteorological Society. 资助项目: NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49832
Appears in Collections: 气候变化事实与影响
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作者单位: Center for Ocean-Land-Atmosphere Studies, George Mason University, Fairfax, VA, United States
Recommended Citation:
Halder S.,Dirmeyer P.A.. Relation of Eurasian snow cover and Indian summer monsoon rainfall: Importance of the delayed hydrological effect[J]. Journal of Climate,2017-01-01,30(4)