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The influence of photochemical aging on light absorption of atmospheric black carbon and aerosol single-scattering albedo
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The influence of photochemical aging on light absorption of atmospheric black carbon and aerosol single-scattering albedo
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Journal Article
The influence of photochemical aging on light absorption of atmospheric black carbon and aerosol single-scattering albedo
2018
Overview
Coating enhancement of black carbon (BC) light absorption (Eabs)
is a large uncertainty in modelling direct radiative forcing (DRF) by BC.
Reported Eabs values after atmospheric aging vary widely and the
mechanisms responsible for enhancing BC absorption remain elusive. Here, we
report on the direct field measurement of size-resolved mixing state,
Eabs, and aerosol single-scattering albedo (SSA) at
λ = 532 nm at a rural site in east China from June to July 2016.
Strong diurnal variability of Eabs, SSA, and
Ox
(Ox = NO2 + O3, a proxy for
atmospheric photochemical aging) was observed. A method that combined
Eabs and SSA was developed to retrieve the fraction contribution
of BC absorption (fBC), lensing-driven enhancement
(fLens), as well as the fractional contribution of coating
absorption (fraction absorption contribution (fShell), the coated
shell diameter (DShell) and the imaginary part of the complex
refractive index (CRI) of the shell (kShell)). Parameterization
of Eabs and SSA captures much of the influence of BC coating and
the particle absorption. In our measurements at this site, the results showed
that the absorption amplification depended on the coating thickness and the
absorption of coating materials, and photochemistry plays a role in modifying
the absorption of BC-containing particles. The lensing-driven enhancement was
reduced by light absorption of the shell. One implication of these findings
is that the contribution of light-absorbing organic compounds (brown carbon,
BrC) at a longer aging time should be included in climate models.
