Radiative absorption enhancement from coatings on black carbon aerosols
Number of Authors: 7
2016 (English)In: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 551, 51-56 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2016. Vol. 551, 51-56 p.
Black carbon, Aerosol mixing states, Lensing effect, Radiative absorption, China
Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:su:diva-129891DOI: 10.1016/j.scitotenv.2016.02.026ISI: 000372589800007PubMedID: 26874760OAI: oai:DiVA.org:su-129891DiVA: diva2:926411