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The important role of PM1in changes of atmospheric environment:climatic analysis of MODIS aerosol products in Guanzhong Plain |
PENG Yue1, ZHAO Tian-liang1, ZHENG Xiao-bo2, WANG Hong3, YIN Yan1, LIAO Yao2, ZHU Shan-ying1 |
1. Key Laboratory for Aerosol-Cloud-Precipitation of China Meteorological Administration, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Guizhou Institute of Mountainous Climate and Environment, Guiyang 550002, China;
3. Institute of Atmospheric Composition, Chinese Academy of Meteorological Sciences, Beijing 100081, China |
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Abstract The temporal and spatial changes of aerosols over Guanzhong Plain in 15 years were climatologically analyzed in this paper,by using MODIS 3km aerosol products including AOD (aerosol optical depth) and FMF (fine mode fraction).The results showed that Guanzhong Plain was an area with high AOD and low FMF.The highest value of AOD existed in Xi'an and the surrounding areas up to 1.06 while FMF was under 0.3 there.With the decreases in atmospheric aerosol levels over Guanzhong Plain in recent years,the proportion of the PM1 increased year by year.During 2001~2011,AOD values increased significantly and then became decreasing in most areas of Guanzhong Plain over recent 5 years.Meanwhile,FMF values showed a sustaining upward trend from 2001 to 2015,reflecting the influence of increasing anthropogenic aerosols on atmospheric environment.The relationship between 15-year averages of AOD and FMF over Guanzhong Plain presented that when atmospheric aerosol level was low (AOD<0.5),AOD decreased with the increasing FMF,and when atmospheric aerosol level was high (AOD>0.5),AOD increased with the increasing FMF,indicating that atmospheric particles PM1 contributed greatly to atmospheric environment changes both in clean and polluted regions.
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Received: 02 December 2016
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