Arid
DOI10.5194/acp-15-6775-2015
Parameterization of convective transport in the boundary layer and its impact on the representation of the diurnal cycle of wind and dust emissions
Hourdin, F.1; Gueye, M.2; Diallo, B.1; Dufresne, J-L1; Escribano, J.1; Menut, L.1; Marticorena, B.3; Siour, G.3; Guichard, F.4
通讯作者Hourdin, F.
来源期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2015
卷号15期号:12页码:6775-6788
英文摘要

We investigate how the representation of the boundary layer in a climate model impacts the representation of the near-surface wind and dust emission, with a focus on the Sahel/Sahara region. We show that the combination of vertical turbulent diffusion with a representation of the thermal cells of the convective boundary layer by a mass flux scheme leads to realistic representation of the diurnal cycle of wind in spring, with a maximum near-surface wind in the morning. This maximum occurs when the thermal plumes reach the low-level jet that forms during the night at a few hundred meters above surface. The horizontal momentum in the jet is transported downward to the surface by compensating subsidence around thermal plumes in typically less than 1 h. This leads to a rapid increase of wind speed at surface and therefore of dust emissions owing to the strong nonlinearity of emission laws. The numerical experiments are performed with a zoomed and nudged configuration of the LMDZ general circulation model coupled to the emission module of the CHIMERE chemistry transport model, in which winds are relaxed toward that of the ERA-Interim reanalyses. The new set of parameterizations leads to a strong improvement of the representation of the diurnal cycle of wind when compared to a previous version of LMDZ as well as to the reanalyses used for nudging themselves. It also generates dust emissions in better agreement with current estimates, but the aerosol optical thickness is still significantly underestimated.


类型Article
语种英语
国家France ; Senegal
收录类别SCI-E
WOS记录号WOS:000357117500014
WOS关键词GLOBAL CLIMATE MODEL ; WEST-AFRICAN MONSOON ; MASS FLUX FRAMEWORK ; CUMULUS CLOUDS ; DESERT DUST ; PART I ; EROSION ; SIMULATIONS ; SENSITIVITY ; DRY
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/186051
作者单位1.CNRS IPSL UMPC, Meteorol Dynam Lab, Paris, France;
2.UCAD, LPAOSF, Dakar, Senegal;
3.IPSL, UPD, UPEC, UMR CNRS 7583,LISA, Creteil, France;
4.Meteo France, UMR CNRS 3589, CNRM GAME, Toulouse, France
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Hourdin, F.,Gueye, M.,Diallo, B.,et al. Parameterization of convective transport in the boundary layer and its impact on the representation of the diurnal cycle of wind and dust emissions[J],2015,15(12):6775-6788.
APA Hourdin, F..,Gueye, M..,Diallo, B..,Dufresne, J-L.,Escribano, J..,...&Guichard, F..(2015).Parameterization of convective transport in the boundary layer and its impact on the representation of the diurnal cycle of wind and dust emissions.ATMOSPHERIC CHEMISTRY AND PHYSICS,15(12),6775-6788.
MLA Hourdin, F.,et al."Parameterization of convective transport in the boundary layer and its impact on the representation of the diurnal cycle of wind and dust emissions".ATMOSPHERIC CHEMISTRY AND PHYSICS 15.12(2015):6775-6788.
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