DOI: 10.1007/s00382-015-2593-2
Scopus记录号: 2-s2.0-84955441971
论文题名: Impact of moisture flux convergence and soil moisture on precipitation: a case study for the southern United States with implications for the globe
作者: Wei J. ; Su H. ; Yang Z.-L.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-01-02 起始页码: 467
结束页码: 481
语种: 英语
英文关键词: Land–atmosphere interaction
; Moisture flux convergence
; Soil moisture
; Southern U.S
; WRF
英文摘要: Interactions between soil moisture, evapotranspiration (ET), atmospheric moisture fluxes and precipitation are complex. It is difficult to attribute the variations of one variable to another. In this study, we investigate the influence of atmospheric moisture fluxes and land surface soil moisture on local precipitation, with a focus on the southern United States (U.S.), a region with a strong humidity gradient and intense moisture fluxes. Experiments with the Weather Research and Forecasting model show that the variation of moisture flux convergence (MFC) is more important than that of soil moisture for precipitation variation over the southern U.S. Further analyses decompose the precipitation change into several contributing factors and show that MFC affects precipitation both directly through changing moisture inflow (wet areas) and indirectly by changing the precipitation efficiency (transitional zones). Soil moisture affects precipitation mainly by changing the precipitation efficiency, and secondly through direct surface ET contribution. The greatest soil moisture effects are over transitional zones. MFC is more important for the probability of heavier rainfall; soil moisture has much weaker impact on rainfall probability and its roles are similar for the probability of intermediate-to-heavy rainfall (>10 mm day−1). Although MFC is more important than soil moisture for precipitation over most regions, the impact of soil moisture could be large over certain transitional regions. At the submonthly time scale, the African Sahel appears to be the only major region where soil moisture has a greater impact than MFC on precipitation. This study provides guidance to understanding and further investigation of the roles of local land surface processes and large-scale circulations on precipitation. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: KAUST, National Aeronautics and Space Administration
; 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/53883
Appears in Collections: 过去全球变化的重建
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作者单位: Center for Integrated Earth System Science, Jackson School of Geosciences, University of Texas at Austin, 2275 Speedway C9000, Austin, TX, United States
Recommended Citation:
Wei J.,Su H.,Yang Z.-L.. Impact of moisture flux convergence and soil moisture on precipitation: a case study for the southern United States with implications for the globe[J]. Climate Dynamics,2016-01-01,46(2017-01-02)