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| Simulation of extinction and radiant effect of aerosol in spring of Tianjin City |
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Abstract The size distribution of aerosol number concentration in haze days and non-haze days during spring in Tianjin was fitted based on the measured particle number concentrations by the Grimm instrument. According to the chemical composition of aerosol over the same period, the extinction characteristics of ambient aerosol in haze days and non-haze days were calculated using Mie theory model. The optical parameters of aerosol in the atmospheric radiation transmission model LOWTRAN7 was modified and radiant flux densities on the ground in haze days and non-haze days were simulated. The average extinction coefficient and scattering coefficient of atmospheric aerosol were 0.253km-1and 0.213 km-1 in non-haze days, while 0.767km-1and 0.665 km-1 in haze days. The model calculated shortwave radiant flux densities in haze days and non-haze days showed fairly agreement with the observation results.
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Received: 08 June 2010
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