| In the paper, we have used the solar spectral data which had obtained by a 8-wavelength sun-photometer on clear days during the period from January through December in 2002. The sun-photometer had been designed by Chinese academy of sciences Anhui institute of optic and fine mechanics. And NCAR/NCEPT day by day reanalyzed data from January to December in 2002.We had used the solar spectral data to retrieve the Angstrom turbidity coefficient, the angstrom wavelength exponent, aerosol size distribution. It was found that pollution was serious caused by aerosol and mainly consisted of small particles. The monthly average Angstrom wavelength exponent had a obvious change with season and had a close relation with local climate; the coarse particles in the air was mainly contributed by local element.We used NCAR/NCEPT anew analyze data and the method of bilinearity insert to fix on profile distribution of several physical field in the air on observation point and the stream field of 700hPa. We primary discussed the possible mechanism to influence aerosol size distribution.The atmospheric condition of 1000hPa~700hPa level had great influence on aerosol size distribution, and influence on coarse particle mainly below 850hPa level. The horizontal wind velocity of 925hPa level is a primary gene which contributed to coarse particles in the air. Vorticity profile especially below 700hPa level is a key gene to influence diffuse and convergence of local aerosol. The air vertical motion velocity greatly influenced aggregation and remove of aerosol particles. The vertical distribution of air temperature mainly influenced vertical transportation of aerosol.The vapor content in the air had a complex influence on aerosol size distribution. The increasing of vapor content in some degree will mainly the effective radius of aerosol particle. But the overlarge vapor content may lead to remove of coarse particles in aerosol. |
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