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Characteristics of three-dimensional aerosol distribution in Eastern China based on satellite data |
TANG Zhi-wei, XU Xiao-feng, YANG Xiao-yue, WU Hao, XIE Li-feng |
School of Atmospheric Physics, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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Abstract Using MODIS and CALIPSO level2 aerosol products, the 3D variation characteristics of multiple aerosol optical parameters (aerosol optical depth, extinction coefficient, color ratio and depolarization ratio) were presented by statistical analysis over Eastern China (27°N~37°N and 113°E~123°E) during 2007~2016. The results showed that the aerosol optical depth (AOD) in Eastern China decreased from the north to south, and was higher in plain than in mountain. The seasonal AODs showed higher values in spring and summer, while lower in autumn and winter. The maximum AOD was in summer and the minimum in winter. The AOD in the north part (>31°N) showed more fluctuations than the south. The aerosol extinction coefficient (σ) had an exponential decay with the height. It showed large (small) σ in low layer but rapid (slow) decreasing with the height in autumn and winter (spring and summer). It showed higher σ in the north part than the south below 2km. The color ratios (CRs), with the annual mean values of 0.6~0.7, showed an increasing trend with the height and a decreasing trend with the time. The seasonal CRs below 4km had the maximum in spring and the minimum in summer which showed uniform vertical mixing. However, the CRs above 4km showed the maximum in winter while the minimum in summer. The annual mean depolarization ratios (PDRs) ranging from 0.1~0.25 increased with the height and presented higher values in the northern part. For seasonal PDR, it had the maximum in spring and the minimum in summer below 5km, while the highest in winter and the lowest in summer above 5km. For the aerosol compositions in Eastern China, the main pollutant below 2km was dust. For 2~5 km, it dominated by dust in spring and smoke in other seasons. Above 5km, the main pollutant was dust in winter and spring, while smoke in summer and autumn.
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Received: 08 January 2019
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