期刊
GEOPHYSICAL RESEARCH LETTERS
卷 45, 期 9, 页码 4456-4465出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL076926
关键词
absorbing aerosol; smoke; remote southeast Atlantic; DOE AMF1
资金
- Department of Energy (DOE) Atmospheric System Research (ASR) LASIC planning grant [DE-SC0013720]
- DOE Office of Biological and Environmental Sciences (OBER) through ASR program [DE-SC0012704]
- ACK through ASR program
- ACK through ARM program
- Aerosol Lifecycle Working Group
- ARM Climate Research Facility
Observations from June to October 2016, from a surface-based ARM Mobile Facility deployment on Ascension Island (8 degrees S, 14.5 degrees W) indicate that refractory black carbon (rBC) is almost always present within the boundary layer. The rBC mass concentrations, light absorption coefficients, and cloud condensation nuclei concentrations vary in concert and synoptically, peaking in August. Light absorption coefficients at three visible wavelengths as a function of rBC mass are approximately double that calculated from black carbon in lab studies. A spectrally-flat absorption angstrom exponent suggests most of the light absorption is from lens-coated black carbon. The single-scattering-albedo increases systematically from August to October in both 2016 and 2017, with monthly means of 0.78 +/- 0.02 (August), 0.81 +/- 0.03 (September), and 0.83 +/- 0.03 (October) at the green wavelength. Boundary layer aerosol loadings are only loosely correlated with total aerosol optical depth, with smoke more likely to be present in the boundary layer earlier in the biomass burning season, evolving to smoke predominantly present above the cloud layers in September-October, typically resting upon the cloud top inversion. The time period with the campaign-maximum near-surface light absorption and column aerosol optical depth, on 13-16 August 2016, is investigated further. Backtrajectories that indicate more direct boundary layer transport westward from the African continent is central to explaining the elevated surface aerosol loadings.
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