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| Estimations of aerosol direct radiative forcing at the top of the atmosphere using remote sensing data in Yangtze River Delta region, China |
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Abstract An estimation of aerosol direct radiative forcing (ADRF) at the top of the atmosphere was performed using remote sensing data in Yangtze River Delta region and its temporal-spatial variation was analyzed. The results indicate that there was obvious linear correlation between ADRF and aerosol optical thickness (AOT), and R = 0.89 with RMSE = 5.50 respectively. The regional monthly mean ADRF were between -10~-70 W/m2, the largest value (-53.97±6.14 W/m2) and smallest value (-16.41±2.10 W/m2) of ADRF during one year appeared in June and December as AOT, respectively. The ADRF of 4 seasons in order of summer (-44.30±9.09 W/m2) > spring (-42.00±7.83 W/m2) > autumn (-28.02±6.32 W/m2) > winter (-20.40±5.00 W/m2). The largest difference of spatial distribution of ADRF at the top of the atmosphere appeared in June. In urban regions around Tai Lake, such as Shanghai, Hangzhou, the ADRF was up to -70 W/m2, and the ADRF was about -10 W/m2 in Qiandaohu Lake region. While the smallest difference appeared in December, the ADRF was about -20 W/m2 in northern urban regions and about -10 W/m2 in southern regions.
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Received: 10 September 2012
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