A simulation of haze and mist events observed in East Asia during 19-22 May 2010 using the Aerosol Modeling System (AMS)

摘要

A prolonged haze and mist event with the observed aerosol concentration (PM_(10)) exceeding 100 μg m~(-3) for the period of 19-22 May 2010 at most of the aerosol monitoring sites over Korea has been simulated with the use of the Aerosol Modeling System (AMS). The International Chemical Transport Experiment - Phase B (INTEX-B) pollutant emission data of 2006 in Asian domain at 27 km horizontal grid spacing (Model 1) and in the nested East Asian domain at 9 km horizontal grid spacing (Model 2) and the Clean Air Policy Supporting System (CAPSS) of Korea emission data of 2007 in the nested Korean domain at 3 km horizontal grid spacing (Model 3) are used to simulate this event. It is found that the AMS model in all three different domains can simulate quite well the starting and ending times of the observed haze and mist event with slightly different PM_(10) concentrations. However, the ensemble mean aerosol concentration of results of Models 1, 2 and 3 is found to yield much better results compared to observation in Korea. It is also found that the simulated aerosol compositions of this event are a complex mixture of anthropogenic aerosols, Asian dust and water droplets that can be used to distinguish mist from haze; the high concentration of water droplets of the mixture yields to mist, otherwise it is haze. This suggests that the AMS model with the nested meteorological models has a great potential for the use of aerosol forecast model in a specific region.