ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-11-13001-2011 Atmospheric dust modeling from meso to global scales with the online NMMB/BSC-Dust model – Part 1: Model description, annual simulations and evaluation Pérez C. 1 2 3 Haustein K. 4 Janjic Z. 5 Jorba O. 4 Huneeus N. 6 Baldasano J. M. 4 7 Black T. 5 Basart S. 4 Nickovic S. 8 Miller R. L. 1 2 Perlwitz J. P. 1 2 Schulz M. 6 Thomson M. 3 NASA Goddard Institute for Space Studies, New York, USA Department of Applied Physics and Applied Math, Columbia University, New York, USA International Research Institute for Climate and Society, Palisades, New York, USA Barcelona Supercomputing Center – Centro Nacional de Supercomputación, Barcelona, Spain National Centers for Environmental Prediction, Camp Springs, Maryland, USA Laboratoire des Sciences du Climat et de l'Environnement, L'Orme de Merisier, Gif sur Yvette, France Universitat Politecnica de Catalunya, Barcelona, Spain World Meteorological Organization, Geneva, Switzerland 21 12 2011 11 24 13001 13027 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/11/13001/2011/acp-11-13001-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/11/13001/2011/acp-11-13001-2011.pdf

We describe and evaluate the NMMB/BSC-Dust, a new dust aerosol cycle model embedded online within the NCEP Non-hydrostatic Multiscale Model (NMMB). NMMB is a further evolution of the operational Non-hydrostatic Mesoscale Model (WRF-NMM), which together with other upgrades has been extended from meso to global scales. Its unified non-hydrostatic dynamical core is prepared for regional and global simulation domains. The new NMMB/BSC-Dust is intended to provide short to medium-range weather and dust forecasts from regional to global scales and represents a first step towards the development of a unified chemical-weather model. This paper describes the parameterizations used in the model to simulate the dust cycle including sources, transport, deposition and interaction with radiation. We evaluate monthly and annual means of the global configuration of the model against the AEROCOM dust benchmark dataset for year 2000 including surface concentration, deposition and aerosol optical depth (AOD), and we evaluate the daily AOD variability in a regional domain at high resolution covering Northern Africa, Middle East and Europe against AERONET AOD for year 2006. The NMMB/BSC-Dust provides a good description of the horizontal distribution and temporal variability of the dust. Daily AOD correlations at the regional scale are around 0.6–0.7 on average without dust data assimilation. At the global scale the model lies within the top range of AEROCOM dust models in terms of performance statistics for surface concentration, deposition and AOD. This paper discusses the current strengths and limitations of the modeling system and points towards future improvements.

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