DOI: 10.1002/2014JD021872
论文题名: Impacts of modified Richards equation on RegCM4 regional climate modeling over East Asia
作者: Yu Y. ; Xie Z. ; Zeng X.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 2169897X
出版年: 2014
卷: 119, 期: 22 起始页码: 12642
结束页码: 12659
语种: 英语
英文关键词: East Asia monsoon region
; modified Richards equation
; regional climate
; soil moisture
Scopus关键词: algorithm
; atmosphere-biosphere interaction
; climate modeling
; evapotranspiration
; precipitation (climatology)
; regional climate
; Richards equation
; simulation
; soil moisture
; spatiotemporal analysis
; water vapor
; China
; Far East
; Qinghai-Xizang Plateau
英文摘要: To remove the deficiency of the numerical solution of the mass conservation-based Richards equation for soil moisture in a regional climate model (RegCM4 with its land surface component Community Land Model 3.5 (CLM3.5)), a revised numerical algorithm that is used in CLM4.5 is implemented into CLM3.5. Compared with in situ measurements, the modified numerical method improves the ground water table depth simulations in RegCM4. It also improves the temporal and spatial variability of soil moisture to some extent. Its impact on simulated summer precipitation is mixed, with improvements over three subregions in China but with increased errors in three other subregions. The impact on the simulated summer temperature is relatively small (with the mean biases changed by less than 10% over most subregions). The evapotranspiration differences between modified and control land-atmosphere coupled simulations are enhanced over the northwest subregion and Tibetan Plateau compared to offline simulations due to land surface feedbacks to the atmosphere (in coupled simulations). Similarly the soil moisture differences in coupled simulations are geographically different from those in offline simulations over the eastern monsoon area. The summer precipitation differences between modified and control coupled simulations are found to be explained by the differences of both surface evapotranspiration and large-scale water vapor flux convergence which have opposite signs over the northwest subregion and Tibetan Plateau but have the same signs over other subregions. ©2014. American Geophysical Union. All Rights Reserved. 资助项目: 91125016
; AGS-0944101
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63027
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Zhejiang Institute of Meteorological Sciences, Hangzhou, China; Department of Atmospheric Sciences, University of Arizona, Tucson, AZ, United States
Recommended Citation:
Yu Y.,Xie Z.,Zeng X.. Impacts of modified Richards equation on RegCM4 regional climate modeling over East Asia[J]. Journal of Geophysical Research Atmospheres,2014-01-01,119(22)