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Aerosol optical depth (AOD) and Angstrom exponent of aerosols observed by the Chinese Sun Hazemeter Network from August 2004 to September 2005
Xin, Jinyuan; Wang, Yuesi; Li, Zhanqing; Wang, Pucai; Hao, Wei Min; Nordgren, Bryce L.; Wang, Shigong; Lui, Guangren; Wang, Lili; Wen, Tianxue; Sun, Yang; Hu, Bo. 2007. Aerosol optical depth (AOD) and Angstrom exponent of aerosols observed by the Chinese Sun Hazemeter Network from August 2004 to September 2005. Journal of Geophysical Research. 112: D05203. doi: 10.1029/2006JD007075.
To reduce uncertainties in the quantitative assessment of aerosol effects on regional climate and environmental changes, extensive measurements of aerosol optical properties were made with handheld Sun photometers in the Chinese Sun Hazemeter Network (CSHNET) starting in August 2004. Regional characteristics of the aerosol optical depth (AOD) at 500 nm and Angstrom exponent (alpha) computed using 405, 500, and 650 nm were analyzed for the period of August 2004 to September 2005. The smallest mean AOD (~0.15) was found in the Tibetan Plateau where alpha showed the largest range in value (0.06-0.9). The remote northeast corner of China was the next cleanest region with AODs ranging from 0.19 to 0.21 and with the largest alpha (1.16-1.79), indicating the presence of fine aerosol particles. The forested sites exhibited moderate values of AOD (0.19-0.51) and alpha (0.97-1.47). A surprising finding was that the AOD measured at a few desert sites in northern China were relatively low, ranging from 0.24 to 0.36, and that alpha ranged from 0.42 to 0.99, presumably because of several dustblowing episodes during the observation period. The AOD observed over agricultural areas ranges from 0.38 to 0.90; alpha ranges from 0.55 to 1.11. These values do not differ much from those observed at the inland urban and suburban sites where AOD ranges from 0.50 to 0.69 and alpha ranges from 0.90 to 1.48. Given the geographic heterogeneity and the rapid increase in urbanization in China, much longer and more extensive observations are required.
Keywords: aerosol optical depth (AOD), Angstrom exponent of aerosols, Chinese Sun Hazemeter Network (CSHNET)
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Title: RMRS Other
Publications: Aerosol optical depth (AOD) and Angstrom exponent
of aerosols observed by the Chinese Sun Hazemeter Network from
August 2004 to September 2005
Electronic Publish Date: May 4, 2009
Last Update: May 4, 2009
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