| Aerosol can affect radiation budget by direct and indirect radiation effect, and then affect the whole world enviornment and climate, which is regarded as an important facter of climate research. Yangtze delta area is one hot spot of aerosol in China, therefore signify the importance of aerosol property research in this area, not only by obtaining long term database of Taihu aerosol property, but also by better knowing the property and less forecasting uncertainty in this area. This all research can help a lot on weather forecasting and climate predicting. And then satellite data need to be calibrated by land-based observation, in order to improving remote sensing accuracy in the future. In this paper, Direct, diffuse and net solar radiation was measured at a site in the Taihu region from May2008to April2009using a multi-filter rotating shadow band radiometer. Based on the Mie theory of spherical particles, the aerosol particle size distribution was retrieved and analyzed. Diurnal cycles of the aerosol optical depth (AOD) and the aerosol particle size distribution differed from weekdays to weekends due to human activities. More fine particles were generated from06:00-09:00(local time) on weekdays than during the same period on weekends. The annually averaged AOD at500nm was0.8038±0.7924with a maximum value of0.9359±0.7389in the summer and a minimum value of0.6209±0.55in the winter. The aerosol particle size distribution was bimodal with a fine-mode peak at0.15μn and a coarse-mode peak at3μm. Finer particles dominated over the area in the summer and autumn; in winter, coarse-mode particles dominated. Variations in AOD and aerosol particle size distribution were significantly influenced by weather patterns. Aerosol loading was greatly diminished by precipitation washout and the subsequent build-up in aerosol loading depended on the aerosol particle size. The rate of increase of submicron aerosol particles was greater than that of coarse-mode aerosol particles. |
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