Analysis of the Spatiotemporal Variations of Aerosols During APEC Using MODIS and MISR Data

Abstract

Abstract:

By using MODIS and MISR data, the spatiotemporal distribution characteristic of aerosols were studied for the period before, during and after Asia-Pacific Economic Cooperation (APEC) Conference 2014 (November 3 to 12). Compared with the month before APEC, the aerosol optical depth (AOD) during APEC shows an apparent decrease in the region of Beijing-Tianjin-Hebei (36°N~41°N, 113.5°E~118.5°E), which decreases by 38.7% (36.4%) according to MODIS (MISR) data. And the AOD decreases more substantially in Beijing, which decreases by 64.6% ( 39.9%). The spatial distribution of the Angstrom exponent shows that in the most of the city of Beijing-Tianjin-Hebei region (e.g. Langfang, Baoding, Hengshui, etc.), the Angstrom exponent during APEC is relatively small, which indicates that the effective radius of the aerosol is relatively large. During APEC, the optical depth of the fine mode aerosol also decreases in comparison with the period before APEC, and it declines more significantly than the optical depth of the coarse aerosol in Beijing.

Key words: MODIS, MISR, APEC, aerosol, aerosol optical depth, Angstrom exponent

CLC Number:

P405

ZHANG Yan-Ting, CHEN Bin, ZHANG Ting-Han, ZHANG Zhi-Juan, ZHANG Guo-Long, GUAN Xiao-Dan, ZHANG Bei-Dou. Analysis of the Spatiotemporal Variations of Aerosols During APEC Using MODIS and MISR Data[J]. Journal of Atmospheric and Environmental Optics, 2017, 12(2): 136-147.

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