Estimating Surface Direct Radiation Effect of Aerosol Based on MODIS and AERONET Data

doi:10.3969/j.issn.1000-6362.2018.11.001

Abstract

Abstract:

Under climate change, the research on the direct radiation effect of aerosol in high polluted areas is of great significance for atmospheric environment monitoring, climate change assessment and agricultural production distribution in these areas. In this paper, the direct radiation effects of aerosol from January 2001 to December 2016 were quantitatively evaluated in Beijing, Xianghe and Taihu three typical global aerosol monitoring network (AERONET) sites of China based on the observation data of AERONET and the surface albedo data of MODIS. 6S (Second Simulation of a Satellite Signal in the Solar) radiative transmission model was used. The results showed: (1) the PM2.5 mass concentration in three typical high pollution sites showed obvious seasonal variations, and the pollution was more serious in the autumn and in the winter than other season. In especial, the high values of PM2.5 mass concentration were mainly concentrated in January, February, November and December. (2)Compared with no aerosol, the interannual change of surface direct radiation caused by aerosol was obvious in each site. Affected by aerosol, the interannual change in daily average surface direct radiation in Beijing, Xianghe and Taihu stations was obviously increasing from 2001 to 2016. In especial, the maximum daily direct radiation was found in the Xianghe station (621.14W·m⁻²),followed by the Taihu station (743.29W·m⁻²) and the Beijing station (488.14W·m⁻²). (3) Affected by aerosol, the surface direct radiation in each station was reduced. Moreover, the effects of aerosol on the surface direct radiation in different stations were different. During the time of 2001−2016, the average surface direct radiation in Beijing, Taihu and Xianghe stations decreased by 32.29%, 24.01% and 15.07%, respectively. Among them, the aerosol had the greatest impact on the direct surface radiation of Beijing Station, followed by Taihu station and Xianghe station. (4) Over the recent 15 years, the aerosol surface radiation effect in Beijing,Xianghe and Taihu stations all increased.

Key words: MODIS, AERONET, Aerosol, PM2.5, Direct radiation effect

ZHAO Jun-fang, XU Hui, KONG Xiang-na, GUO Jian-ping, XU Jing-wen, YU Wei-guo. Estimating Surface Direct Radiation Effect of Aerosol Based on MODIS and AERONET Data[J]. Chinese Journal of Agrometeorology, 2018, 39(11): 693-701.

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