The Inversion And Analysis Of Atmospheric Aerosol Optical Depth (AOD) Of Changchun

A Atmospheric aerosol is formed by suspension of liquid and solid particles in the atmosphere. Atmospheric aerosol contents small, however its influence is bigger in climate and environment. It is the hot spot problem of research in Atmospheric physics, geographical science and remote sensing aerospace. Atmospheric aerosol can influent the atmosphere of chemical process directly or indirectly by radiation effect. It will reduce visibility by absorbing and scattering the sunlight. It influents the safe of air, sea and land transportation.In addition, aerosol has effects on military system and human health. Humans began to study aerosol in quantitative from the 1920s. With the development of technology, the research methods of atmospheric aerosols optical properties include the sun photometric foundation remote sensing in narrow band, Radar technology, satellite measurements technology, surface radiation material and meteorological data. In order to promote the study of aerosol in our country and private basic reference material to Satellite inversion, this paper have used the sun photometric of CE-318 to observe Changchun for a year. It used Beer-Lambert-Bouguer law to inverse atmospheric aerosol optical depth and obtained MODIS images in the same period. It inverse atmospheric aerosol optical depth by extend dense dark vegetation 6S model. The main research results include:(1) The aerosol extinction characteristics are different in different bands. Atmospheric aerosol optical depth changes obviously with the wavelength. Aerosol optical depth as the general trend performance increases with the wavelength reducing. Aerosol optical depth in different bands changes consistently. The smaller wavelength is, the more obviously aerosol optical depth changes.(2) Changchun aerosols optical depth has obvious diurnal variation characteristic. The rule has four main types which are stable type, rise type, fall type and single-peak type.(3) Changchun aerosol optical depth is bigger in spring and winter. It is smaller in summer and autumn. It is the biggest in spring because of surface thaw. It has effect by heating emissions of particles in winter.(4) Alpha which is Angstrom parameter of aerosol particles reflects the composition of aerosol particle. Alpha is the biggest in summer and the smallest in autumn. Small aerosol particle has more proportion in summer of Changchun and big particle has more proportion in autumn. Beta reflects the situation of atmospheric turbidity. It matches with seasonal changing. (5) The results are different between satellite and foundation. The gap is the biggest in winter. The seasons are the approximation of dense dark vegetation, aerosol pattern and fixed oneness.