DOI: 10.1002/2013GL058511
论文题名: Modeling soil moisture-precipitation feedback in the Sahel: Importance of spatial scale versus convective parameterization
作者: Taylor C.M. ; Birch C.E. ; Parker D.J. ; Dixon N. ; Guichard F. ; Nikulin G. ; Lister G.M.S.
刊名: Geophysical Research Letters
ISSN: 0094-8295
EISSN: 1944-8026
出版年: 2013
卷: 40, 期: 23 起始页码: 6213
结束页码: 6218
语种: 英语
英文关键词: convective initiation
; land-atmosphere feedback
; Sahel
; soil moisture
Scopus关键词: Climate variability
; Convective initiation
; Convective parameterization
; Different resolutions
; Global atmospheric models
; Regional climate models
; Sahel
; Spatial resolution
; Arid regions
; Computer simulation
; Parameterization
; Soil moisture
; Feedback
; atmospheric modeling
; climate modeling
; climate variation
; numerical model
; parameterization
; precipitation (climatology)
; semiarid region
; sensitivity analysis
; soil moisture
; Sahel [Sub-Saharan Africa]
英文摘要: Feedback between soil moisture and precipitation influence climate variability in semiarid regions. However, serious concerns exist about the ability of coarse-scale global atmospheric models to depict one key aspect of the feedback loop, namely the sensitivity of daytime convection to soil moisture. Here we compare regional simulations using a single model, run at different spatial resolutions, and with convective parameterizations switched on or off against Sahelian observations. Convection-permitting simulations at 4 and 12 km capture the observed relationships between soil moisture and convective triggering, emphasizing the importance of surface-driven mesoscale dynamics. However, with the inclusion of the convection scheme at 12 km, the behavior of the model fundamentally alters, switching from negative to positive feedback. Similar positive feedback is found in 9 out of 10 Regional Climate Models run at 50 km. These results raise questions about the accuracy of the feedback in regional models based on current convective parameterizations. Key Points Soil moisture-precipitation feedback analyzed in models of different resolution Realistic depiction of storm initiation in convection-permitting simulations Convective parameterization changes feedback sign ©2013 The Authors. Geophysical Research Letters published by Wiley on behalf of the American Geophysical Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84889876064&doi=10.1002%2f2013GL058511&partnerID=40&md5=720a10f88bd8505ef91aae4b18f396f2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5559
Appears in Collections: 气候减缓与适应
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作者单位: Centre for Ecology and Hydrology, Crowmarsh Gifford, Wallingford, Oxfordshire, OX10 8BB, United Kingdom
Recommended Citation:
Taylor C.M.,Birch C.E.,Parker D.J.,et al. Modeling soil moisture-precipitation feedback in the Sahel: Importance of spatial scale versus convective parameterization[J]. Geophysical Research Letters,2013-01-01,40(23).