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Parameterization of convective transport in the boundary layer and its impact on the representation of the diurnal cycle of wind and dust emissions

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Title: Parameterization of convective transport in the boundary layer and its impact on the representation of the diurnal cycle of wind and dust emissions
Authors: F. Hourdin, M. Gueye, B. Diallo, J.-L. Dufresne, J. Escribano, L. Menut, B. Marticoréna, G. Siour, F. Guichard
Source: Atmospheric Chemistry and Physics, Vol 15, Iss 12, Pp 6775-6788 (2015)
Publisher Information: Copernicus Publications, 2015.
Publication Year: 2015
Collection: LCC:Physics
LCC:Chemistry
Subject Terms: Physics, QC1-999, Chemistry, QD1-999
More Details: 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.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 1680-7316
1680-7324
Relation: http://www.atmos-chem-phys.net/15/6775/2015/acp-15-6775-2015.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324
DOI: 10.5194/acp-15-6775-2015
Access URL: https://doaj.org/article/5c6d21c52de649b6a325d4dc335881b7
Accession Number: edsdoj.5c6d21c52de649b6a325d4dc335881b7
Database: Directory of Open Access Journals
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  Data: Parameterization of convective transport in the boundary layer and its impact on the representation of the diurnal cycle of wind and dust emissions
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  Data: <searchLink fieldCode="AR" term="%22F%2E+Hourdin%22">F. Hourdin</searchLink><br /><searchLink fieldCode="AR" term="%22M%2E+Gueye%22">M. Gueye</searchLink><br /><searchLink fieldCode="AR" term="%22B%2E+Diallo%22">B. Diallo</searchLink><br /><searchLink fieldCode="AR" term="%22J%2E-L%2E+Dufresne%22">J.-L. Dufresne</searchLink><br /><searchLink fieldCode="AR" term="%22J%2E+Escribano%22">J. Escribano</searchLink><br /><searchLink fieldCode="AR" term="%22L%2E+Menut%22">L. Menut</searchLink><br /><searchLink fieldCode="AR" term="%22B%2E+Marticoréna%22">B. Marticoréna</searchLink><br /><searchLink fieldCode="AR" term="%22G%2E+Siour%22">G. Siour</searchLink><br /><searchLink fieldCode="AR" term="%22F%2E+Guichard%22">F. Guichard</searchLink>
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  Data: Atmospheric Chemistry and Physics, Vol 15, Iss 12, Pp 6775-6788 (2015)
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  Data: Copernicus Publications, 2015.
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  Data: 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.
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