Observations And Analysis Of Aerosol Optical Properties Over The Northern Yellow Sea Of China

In this dissertation, in-situ aerosol observations from three cruises were used to analyze the aerosol optical properties over the Northern Yellow Sea of China. The three cruises were SOLAS in spring 2006, 908 in winter 2006 and 908 in autumn 2007. A ship-borne seven bands sky-radiometer (POM-01MKII from PREDE Co., Japan) was used to make automatic aerosol observations during the cruises, and aerosol optical properties such as aerosol optical thickness, single scattering albedo, particle size distribution and phase function were retrieved from the collected data. Based on the data, spatial and temporal distributions and seasonal variations of aerosol optical properties in the study area were analyzed, and possible effect of atmosphere pollution like dust and soot were also investigated.The results show that the aerosol optical thickness in spring is larger than that in autumn and winter. It is possibly due to the frequent occurrence of weather conditions like dust and haze in the spring season, which will largely affect the atmosphere aerosol properties. Dust aerosol in spring, continental aerosol in autumn and soot aerosol in winter, may affect the compositions of aerosols over the ocean. It shows that the absorption of aerosol is inverse proportional to the distance of the observation site to the land. The particle size distributions also indicate, the ratios of coarse mode and fine mode of aerosol particles usually change very frequently. Sites with strong absorption contain more coarse particles, sea-salt and stratospheric aerosol particles than sites without absorption. The aerosol phase functions show lower scattering intensities at the sites with absorption than that at the sites without absorption for scattering angles in the range of 150 to 180 degrees. And strong aerosol forward scattering intensities were observed in all three seasons.