Aerosol optical absorption by dust and black carbon in Taklimakan Desert, during no-dust and dust-storm conditions--颗粒学报PARTICUOLOGY

Lu, H., Wei, W., Liu, M., Gao, W., & Han, X. (2012). Aerosol optical absorption by dust and black carbon in Taklimakan Desert, during no-dust and dust-storm conditions. Particuology, 10(4), 509–516. https://doi.org/10.1016/j.partic.2011.12.002

Aerosol optical absorption by dust and black carbon in Taklimakan Desert, during no-dust and dust-storm conditions

Hui Lu ^{a b}, Wenshou Wei ^c *, Mingzhe Liu ^a, Weidong Gao ^{c d}, Xi Han ^{a b}

a Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
b Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
c Urumqi Institute of Desert Meteorology, China Meteorological Administration, Urumqi 830002, China
d School of Resources and Environment, University of Jinan, Jinan 250000, China

10.1016/j.partic.2011.12.002

Volume 10, Issue 4, August 2012, Pages 509-516

Received 26 February 2010, Revised 12 July 2010, Accepted 29 December 2011, Available online 13 April 2012.

E-mail: weiwsh@ms.xjb.ac.cn

Highlights

Abstract

Aerosol absorption coefficient σap involves the additive contribution of both black carbon aerosol (BC) and dust aerosol. The linear statistical regression analysis approach introduced by Fialho et al. (2005) is used to estimate the absorption exponents of BC and dust aerosol absorption coefficients, and further to separate the contributions of these two types of aerosols from the total light absorption coefficient measured in the hinterland of Taklimakan Desert in the spring of 2006. Absorption coefficients are measured by means of a 7-wavelength Aethalometer from 1 March to 31 May and from 1 November to 28 December, 2006. The absorption exponent of BC absorption coefficient α is estimated as (−0.95 ± 0.002) under background weather (supposing the observed absorption coefficient is due only to BC); the estimated absorption exponent of dust aerosol absorption coefficient β during the 6 dust storm periods (strong dust storm) is (−2.55 ± 0.009). Decoupling analysis of the measured light absorption coefficients demonstrates that, on average, the light absorptions caused by dust aerosol and BC make up about 50.5% and 49.5% respectively of the total light absorption at 520 nm; during dust weather process periods (dust storm, floating dust, blowing dust), the contribution of dust aerosol to absorption extinction is 60.6% on average; in the hinterland of desert in spring, dust aerosol is also the major contributor to the total aerosol light absorption, more than that of black carbon aerosol.

Graphical abstract

Keywords

Black carbon; Dust; Absorption coefficient; Absorption exponent of absorption coefficient; Decoupling of absorption coefficient

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