Geoscientific Model Development Discussions www.geosci-model-dev-discuss.net 1991-9611 1991-962X 2 2 2009 10.5194/gmdd-2-681-2009 http://www.geosci-model-dev-discuss.net/2/681/2009/ http://www.geosci-model-dev-discuss.net/2/681/2009/gmdd-2-681-2009.html http://www.geosci-model-dev-discuss.net/2/681/2009/gmdd-2-681-2009.pdf 681 707 2009-07-01 Implementation of a new aerosol HAM model within the Weather Research and Forecasting (WRF) modeling system R. Mashayekhi rmash@ut.ac.ir P. Irannejad J. Feichter A. A. Bidokhti Institute of Geophysics, University of Tehran, Tehran, Iran Max Planck Institute for Meteorology, Hamburg, Germany A new coupled system of aerosol HAM model and the Weather, Research and Forecasting (WRF) model is presented in this paper. Unlike the current aerosol schemes used in WRF model, the HAM is using a "pseudomodal" approach for the representation of the particle size distribution. The aerosol components considered are sulfate, black carbon, particulate organic matter, sea salt and mineral dust. The preliminary model results are presented for two different 6-day simulation periods from 22 to 28 February 2006 as a winter period and 6 to 12 May 2006 as a mild period. The mean shortwave radiation and thermal forcing were calculated from the model simulations with and without aerosols feedback for two simulation periods. A negative radiative forcing and cooling of the atmosphere were found mainly over the regions of high emission of mineral dust. The absorption of shortwave radiation by black carbon caused warming effects in some regions with positive radiative forcing. The simulated daily mean sulfate mass concentration showed a rather good agreement with the measurements in the European EMEP network. The diurnal variation of the simulated hourly PM₁₀ mass concentration at Tehran was also qualitatively close to the observations in both simulation periods. 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