ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-8-1105-2008 An improvement on the dust emission scheme in the global aerosol-climate model ECHAM5-HAM Cheng T. 1 3 Peng Y. 1 4 Feichter J. 1 Tegen I. 2 Max-Planck-Institute for Meteorology, Bundesstr. 53, 20146, Hamburg, Germany Leibniz-Institute for Tropospheric Research, Permoserstrasse 15, 04318 Leipzig, Germany Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China Canadian Centre for Climate Modeling and Analysis, 3964 Gordon Head Road, Victoria, B.C., V8N 3X3, Canada 28 02 2008 8 4 1105 1117 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/8/1105/2008/acp-8-1105-2008.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/8/1105/2008/acp-8-1105-2008.pdf

Formulation of the dust emission scheme in the global aerosol-climate modeling system ECHAM5-HAM has been improved. Modifications on the surface aerodynamic roughness length, soil moisture and East-Asian soil properties are included in the parameterization, which result in a large impact on the threshold wind friction velocity for aeolian erosion and thus influence the simulated dust emission amount. The annual global mean of dust emission in the year 2000 is reduced by 76.5% and 2.2%, respectively, due to changes in the aerodynamic roughness length and the soil moisture. An inclusion of detailed East-Asian soil properties leads to an increase of 16.6% in the annual global mean of dust emission, which exhibits mainly in the arid and semi-arid areas of northern China and southern Mongolia. Measurements of the surface dust concentrations are collected in remote marine sites globally and in dust source regions of East Asia. The averaged relative differences between model results and measurements are reduced from 17% to 12% in global remote marine sites and from 69% to 30% in East Asia, by including the improvements. Comparisons between model results and available measurements verify a more realistic dust distribution with the improved emission scheme.

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