Aerosol monitoring at multiple locations in China: Contributions of EC and dust to aerosol light absorption

X. Y. Zhang*, Y. Q. Wang, X. C. Zhang, W. Guo, T. Niu, S. L. Gong, Y. Yin, P. Zhao, J. L. Jin, M. Yu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

This paper reports on the analysis of 24-h aerosol data measured during 2006, at 14 monitoring sites in China. Measurements included seven-wavelength Aethalometers, thermal/optical reflectance analyses of filter samples and determination of dust aerosols. Black (elemental) carbon (BC, EC) is found to be the principal light-absorbing aerosol over many parts of China; however, the fraction of apparent light absorption attributed to dust varied from 14% in winter, to 11% in spring, to 5% in summer to 9% in autumn. Aerosol light absorption in urban areas was larger than in rural areas by factors of 2.4 in winter, 3.1 in spring and 2.5 in both summer and autumn. These differences may lead to contrasts in radiative, thermal and cloud modification effects between urban and rural areas. Absorption 'hotspots' were located in the Sichuan Basin, the provinces south of Beijing, the Pearl Delta River regions and the Guanzhong Plain. The mass absorption coefficient for aerosol BC (σ BC) based on Aethalometer data is estimated to be 11.7 m2g-1 at 880 nm wavelength (λ) with inverse (λ-1) wavelength scaling, whereas the mass absorption coefficient for dust (σdust) is 1.3 m2g-1 on average without significant wavelength dependence.

Original languageEnglish
Pages (from-to)647-656
Number of pages10
JournalTellus, Series B: Chemical and Physical Meteorology
Volume60
Issue number4
DOIs
Publication statusPublished - 2008
Externally publishedYes

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