Aerosol Optical Properties Affected by a Strong Dust Storm over Central and Northern China |
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Authors: | XIN Jinyuan DU Wupeng WANG Yuesi GAO Qingxian Zhanqing LI and WANG Mingxing |
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Institution: | State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, Beijing Climate Center, Beijing Meteorological Bureau, Beijing 100089,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Chinese Research Academy of Environment Science, Beijing 100012,Department of Meteorology, the University of Maryland, College Park, MD 20782, US,State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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Abstract: | Aerosol observational data at 8 ground-based observation sites in the
Chinese Sun Hazemeter Network (CSHNET) were analyzed to characterize the
optical properties of aerosol particles during the strong dust storm of
16--21 April 2005. The observational aerosol optical depth (AOD) increased
significantly during this dust storm at sites in Beijing city (86%),
Beijing forest (84%), Xianghe (13%), Shapotou (27%), Shenyang
(47%), Shanghai (23%), and Jiaozhou Bay (24%). The API (air
pollution index) in Beijing and Tianjin also had a similar rise during the
dust storm, while the Angstrom exponent (alpha) declined evidently
at sites in Beijing city (21%), Beijing forest (39%), Xianghe
(19%), Ordos (77%), Shapotou (50%), Shanghai (12%), and Jiaozhou
Bay (21%), respectively. Furthermore, The observational AOD and alpha
demonstrated contrary trends during all storm stages (pre-dust storm, dust
storm, and post-dust storm), with the AOD indicating an obvious
``Valley--Peak--Valley' pattern of variation, while alpha demonstrated
a ``Peak--Valley-- Peak' pattern. In addition, the dust module in a
regional climate model (RegCM3) simulated the dust storm occurrence and
track accurately and RegCM3 was able to basically simulate the trends in
AOD. The simulation results for the North China stations were the best, and
the simulation for dust-source stations was on the high side, while the
simulation was on the low side for coastal sites. |
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Keywords: | optical properties \! dust storm RegCM3 aerosol optical depth (AOD) Angstrom exponent (alpha) |
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