4.7 Article

Radiative absorption enhancement from coatings on black carbon aerosols

期刊

SCIENCE OF THE TOTAL ENVIRONMENT
卷 551, 期 -, 页码 51-56

出版社

ELSEVIER
DOI: 10.1016/j.scitotenv.2016.02.026

关键词

Black carbon; Aerosol mixing states; Lensing effect; Radiative absorption; China

资金

  1. Fundamental Research Funds of Shandong University [2014QY001]
  2. Young Scholars Program of Shandong University [2015WLJH37]
  3. National Natural Science Foundation of China [41375126]
  4. Taishan Scholar Grand [ts20120552]
  5. Scientific Research Foundation for Returned Overseas Chinese Scholars of State Education Ministry [11460005451302]
  6. Swedish research funding agency Formas [214-2009-970]
  7. Swedish research funding agency STEM [35450-2]

向作者/读者索取更多资源

The radiative absorption enhancement of ambient black carbon (BC), by light-refractive coatings of atmospheric aerosols, constitutes a large uncertainty in estimates of climate forcing. The direct measurements of radiative absorption enhancement require the experimentally-removing the coating materials in ambient BC-containing aerosols, which remains a challenge. Here, the absorption enhancement of the BC core by non-absorbing aerosol coatings was quantified using a two-step removal of both inorganic and organic matter coatings of ambient aerosols. The mass absorption cross-section (MAC) of decoated/pure atmospheric BC aerosols of 4.4 +/- 0.8 m(2)g(-1) was enhanced to 9.6 +/- 1.8 m(2)g(-1) at 678-nm wavelength for ambiently-coated BC aerosols at a rural Northern China site. The enhancement of MAC (E-MAC) rises from 1.4 +/- 0.3 in fresh combustion emissions to similar to 3 for aged ambient China aerosols. The three-week high-intensity campaign observed an average E-MAC of 2.25 +/- 0.55, and sulfates were primary drivers of the enhanced BC absorption. (C) 2016 Elsevier B.V. All rights reserved.

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