DOI: 10.1002/jgrd.50627
论文题名: Response of land surface fluxes and precipitation to different soil bottom hydrological conditions in a general circulation model
作者: Campoy A. ; Ducharne A. ; Cheruy F. ; Hourdin F. ; Polcher J. ; Dupont J.C.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 19 起始页码: 10725
结束页码: 10739
语种: 英语
英文关键词: climate model
; groundwater
; land surface model
; soil-precipitation feedback Europe
Scopus关键词: Boundary conditions
; Climate models
; Soil moisture
; Water supply
; Atmospheric general circulation models
; Bottom boundary conditions
; General circulation model
; Hydrological condition
; Land surface fluxes
; Land surface modeling
; Shallow water tables
; soil-precipitation feedback Europe
; Groundwater
; boundary condition
; climate modeling
; drainage
; evapotranspiration
; general circulation model
; hydrological change
; land surface
; numerical model
; precipitation (climatology)
; soil column
; soil moisture
; surface flux
; water table
; Europe
英文摘要: Very different approaches exist in land surface models (LSMs) to describe the water fluxes at the soil bottom, from free drainage to zero flux, and even upward fluxes if the soil is coupled to a water table. To explore the influence of these conditions on the water cycle in a unified framework, we introduce new boundary conditions in the ORCHIDEE LSM, which is coupled to the atmospheric general circulation model LMDZ. We use a zoomed and nudged configuration centered over France to reproduce the observed regional weather. Soil moisture and evapotranspiration increase ranging from free drainage to impermeable bottom, then by prescribing saturation closer and closer to the surface. The corresponding response patterns can be related to both climate regimes and soil texture. When confronted to observations from the SIRTA observatory 25 km south of Paris, which exhibits a shallow water table, the best simulations are the ones with prescribed saturation. The local precipitation, however, is only increased if the new bottom boundary conditions are applied globally. The magnitude of this increase depends on the evaporation and on the relative weight of local versus remote sources of moisture for precipitation between Western and Eastern Europe. This suggests that the summer warm/dry bias of many climate models in this region might be alleviated by including a sufficiently realistic ground water description. Key Points Sensitivity to reduced drainage and saturation within the soil column Confrontation to local scale observations exhibiting a shallow water table European scale analysis of the resulting precipitation increase ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63249
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: UMR 7619 Sisyphe, Université Pierre et Marie Curie/CNRS, Paris, France; UMR 8539 Laboratoire de Météorologie Dynamique, Université Pierre et Marie Curie/CNRS, Paris, France; SIRTA, IPSL, Ecole Polytechnique, Palaiseau, France
Recommended Citation:
Campoy A.,Ducharne A.,Cheruy F.,et al. Response of land surface fluxes and precipitation to different soil bottom hydrological conditions in a general circulation model[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(19)