DOI: 10.1002/grl.50239
论文题名: The impact of convective cold pool outflows on model biases in the Sahara
作者: Garcia-Carreras L. ; Marsham J.H. ; Parker D.J. ; Bain C.L. ; Milton S. ; Saci A. ; Salah-Ferroudj M. ; Ouchene B. ; Washington R.
刊名: Geophysical Research Letters
ISSN: 0094-9161
EISSN: 1944-8892
出版年: 2013
卷: 40, 期: 8 起始页码: 1647
结束页码: 1652
语种: 英语
英文关键词: cold pool
; parameterisations of convection
; Saharan heat low (SHL)
; West African monsoon (WAM)
Scopus关键词: Cold pool
; Dust concentrations
; Forecast and analysis
; Heat low
; Radiative impacts
; Regional impacts
; Weather and climate models
; West African Monsoon
; Dust
; Errors
; Lakes
; Radiosondes
; Heat convection
; atmospheric convection
; climate modeling
; cold pool
; dust
; error analysis
; global climate
; humidity
; meridional circulation
; outflow
; parameterization
; radiosonde
; regional climate
; Sahara
; Vulpes zerda
英文摘要: Radiosonde data from Fennec supersite-1 in the remote central Sahara have been used to evaluate the impact of convectively generated cold pool outflows on model errors. Model predictions are too warm and dry, with cold pools contributing significantly to the mean bias. Although dust concentrations are high within cold pools, the sign of the errors is inconsistent with radiative impacts of dust. Cold pools cause 29% of the meridional humidity flux, but this contribution is absent in the forecast and analysis. Assimilating radiosondes reduces the errors, but significant temperature and meridional humidity flux biases remain at night. The model biases are consistent with the larger-scale heat low biases in the operational Met Office Unified Model and can be linked to known issues with convective parameterizations used in all global weather and climate models. This study suggests that the misrepresentation of moist convective processes can affect continental-scale biases, altering the West African monsoon circulation. Key Points First in-situ profiles from the central Sahara are used to evaluate model biases Lack of cold pools outflows from convection is main cause of warm dry model bias This error from convection has a regional impact, important in all global models. ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84877995957&doi=10.1002%2fgrl.50239&partnerID=40&md5=59a2f0e3cc291a89f3b60eee53fe4134
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6425
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Environment, University of Leeds, Leeds, LS31DL, United Kingdom
Recommended Citation:
Garcia-Carreras L.,Marsham J.H.,Parker D.J.,et al. The impact of convective cold pool outflows on model biases in the Sahara[J]. Geophysical Research Letters,2013-01-01,40(8).