ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-11-10485-2011 Study on long-term aerosol distribution over the land of East China using MODIS data He Q. 1 Li C. 2 Geng F. 1 Lei Y. 3 Li Y. 4 Tie X. 1 Yin Q. 1 Shanghai Meteorological Bureau, Shanghai, China Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric Sciences, School of Physics, Peking University, Beijing, China Meteorological Observation Centre of CMA, Beijing, China Shanxi Meteorological Bureau, Taiyuan, China 04 04 2011 11 4 10485 10523 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/11/10485/2011/acpd-11-10485-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/11/10485/2011/acpd-11-10485-2011.pdf

East China is among the fastest developing and most populous area in Asia, where atmospheric aerosol loading is high due to heavy urban and industrial emission. These aerosols may have significant impact on regional climate and environment. In this report, MODIS level 2 aerosol products (2000–2007) were used to study aerosol spatial and temporal distributions, as well as their variations with local meteorological conditions over East China. By combining Aerosol Optical Depth (AOD) and aerosol Fine Mode Fraction (FMF), we found that the urban/industrial aerosol and dust are two dominant species over northern part, whereas continental, marine and mixed aerosols dominate the southern part of East China, except for Poyang Lake Plain. Both annual mean AOD and area with high AOD increased from 2000 to 2007, with the largest increase seen in Yangtze River Delta region (YRD). In summer, AOD in East China reached the maximum of about 0.8 in YRD, dominated by fine mode particles. The minimum AOD occurred in winter with mostly coarse mode particles. The higher AOD in spring is attributed to coarse particles. Local aerosol properties were analyzed in three typical zones: the northern dry zone (I), the central urban/industrial zone (II) and the southern natural background zone (III). Monthly mean AODs in zone I and II were above 0.5 throughout the entire year, with the maximum AOD in June. High FMFs in this period indicated heavy urban and industrial pollutions. Monthly mean AODs and FMFs in zone III reached maximum of 0.51 in April and September (up to 90.7%) respectively. High AOD in spring in zone III appears mostly due to the long-range dust transport from the North. In fact, dust particles contributed 50–80% to aerosol loading in zone I and II, but only 20% in zone III. The effect of meteorological conditions such as temperature, relative humidity (RH) and wind on aerosol loadings over East China were also investigated.

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