HR: 1340h
AN: A23C-0813    [Abstracts]
TI: Modeling Aerosol Radiative Effects over Dust Source Regions in Western North China
AU: * Zhang, L
AF: Department of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000 China
AU: Gao, Y
EM: gaoy@mail.montclair.edu
AF: Department of Earth and Environmental Studies, Montclair State University, 1 Normal Ave., Montclair, NJ 07043 United States
AB: To investigate the effects of aerosols on the radiation budget over Asian dust source regions in western north China, a synthetic numerical boundary layer model has been developed with respect to interactions of aerosols, heat, and wind fields. The model includes three sub-models, which are a 3-D non-stationary atmospheric boundary layer model, an atmospheric diffusion model and a radiation transmission model. The synthetic model has been validated with the measurement data of total suspended particles (TSP), temperature, wind, and radiation in atmospheric boundary layer obtained at Lanzhou (36N, 103E) and adjacent regions on the upper reaches of the Yellow River. The comparison shows that the simulated short and long wave radiation fluxes match the measured data fairly well. Testing of two modelling schemes with and without aerosols clearly brought up the importance of aerosol radiative effects on a regional scale. Preliminary results indicate an obvious heat increase in the boundary layer during daytime due to the effect of aerosol short radiative wave. The temperature increases more than 1 K in an hour. The corresponding variation of the wind speed is about 0.3m s-1. TSP concentrations on the lower layers tend to decline, but on the higher layers they tend to increase. At night, aerosol long wave radiative effect produces an increase in atmospheric temperature near the ground, but the temperature will drop in the lower layer (25m-300m) of the atmosphere, varying about 0.1-0.2 K h-1. Wind speed and TSP concentration tend to make corresponding variations.
DE: 3337 Numerical modeling and data assimilation
DE: 3359 Radiative processes
DE: 3307 Boundary layer processes
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting