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Journal Article: BibTeX citation key:  Reinfried2009a
Reinfried, F., Tegen, I., Heinold, B., Hellmuth, O., Schepanski, K., Cubasch, U., Hübener, H. & Knippertz, P. (2009) Simulations of convectively-driven density currents in the Atlas region using a regional model: Impacts on dust emission and sensitivity to horizontal resolution and convection schemes. IN Journal of Geophysical Research - Atmospheres, 114. D08127.
Added by: Peter Knippertz 2010-08-20 14:07:49    Last Edited by: Fanny Lefebvre 2011-01-11 18:38:43
 B  
Categories: Atmospheric processes
Keywords: Aerosol, Atmospheric Boundary Layer, Clouds - Convection, Diurnal cycle, Dynamics, Modelling, Precipitation, Rainfall, Semi-arid, Surface Flux
Creators: Cubasch, Hübener, Heinold, Hellmuth, Knippertz, Reinfried, Schepanski, Tegen
Collection: Journal of Geophysical Research - Atmospheres

Peer reviewed
Number of views:  880
Popularity index:  49.58%
Maturity index:  published

 
Abstract
During the SAMUM field campaign in southern Morocco in May and June 2006 density currents generated by evaporative cooling after convective precipitation were frequently observed at the Sahara side of the Atlas Mountain chain. The associated strong surface cold-air outflow during such events has been observed to lead to dust mobilization in the foothills. Here a regional model system is used to simulate a density current case on 3 June 2006 and the subsequent dust emission. The model studies are performed with different parameterization schemes for convection, and with different horizontal model grid resolutions to examine to which extent the model system can be used for reproducing dust emissions in this region. The effect of increasing the horizontal model grid resolution from 14 km to 2.8 km on the strength on the density currents and thus on dust emission is smaller than the differences due to different convection parameterization schemes in this case study. While the results in reproducing the observed density current at the Atlas Mountain varied with different convection parameterizations, the most realistic representation of the density current is obtained at 2.8 km grid resolution at which no parameterization of deep convection is needed.
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Added by: Fanny Lefebvre    Last Edited by: Fanny Lefebvre