Key factors affecting single scattering albedo calculation: Implications for aerosol climate forcing

Jo, Duseong S.; Park, Rokjin J.; Jeong, Jae-In; Curci, Gabriele; Lee, Hyung Min; Kim, Sang Woo

doi:10.5194/acp-2017-1104

2017

DOI: 10.5194/acp-2017-1104

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Key factors affecting single scattering albedo calculation: Implications for aerosol climate forcing

Duseong S. Jo

Rokjin J. Park

Jae-In Jeong

et al.

Abstract: Single Scattering Albedo (SSA), the ratio of scattering efficiency to total extinction efficiency, is an essential parameter used to estimate the Direct Radiative Forcing (DRF) of aerosols. However, SSA is one of the large contributors to the uncertainty of DRF estimations. In this study, we examined the sensitivity of SSA calculations to the physical Based on the simulations performed during this study, we found that the global aerosol direct radiative effect was increased by 10 % after the SSA bias was reduc… Show more

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The influence of photochemical aging on light absorption of atmospheric black carbon and aerosol single-scattering albedo

Zhao

Qian

et al. 2018

Atmos. Chem. Phys.

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Abstract. 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.

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The influence of photochemical aging on light absorption of atmospheric black carbon and aerosol single-scattering albedo

Zhao

Qian

et al. 2018

Atmos. Chem. Phys.

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Key factors affecting single scattering albedo calculation: Implications for aerosol climate forcing

Cited by 1 publication

References 58 publications

The influence of photochemical aging on light absorption of atmospheric black carbon and aerosol single-scattering albedo

The influence of photochemical aging on light absorption of atmospheric black carbon and aerosol single-scattering albedo

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