Articles | Volume 20, issue 8
Atmos. Chem. Phys., 20, 4889–4904, 2020
https://doi.org/10.5194/acp-20-4889-2020

Special issue: Multiphase chemistry of secondary aerosol formation under...

Atmos. Chem. Phys., 20, 4889–4904, 2020
https://doi.org/10.5194/acp-20-4889-2020

Research article 27 Apr 2020

Research article | 27 Apr 2020

Optical properties and molecular compositions of water-soluble and water-insoluble brown carbon (BrC) aerosols in northwest China

Jianjun Li et al.

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AR by Jianjun Li on behalf of the Authors (19 Mar 2020)  Author's response    Manuscript
ED: Publish as is (27 Mar 2020) by Jingkun Jiang
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Short summary
We examined light absorption properties and molecular composition of water-soluble (WS) and water-insoluble (WI) BrC in PM2.5 collected from northwest China. We found that photochemical formation contributes significantly to light absorption of WI-BrC in summer, whereas aqueous-phase reactions play an important role in secondary WS-BrC formation in winter. BrC was estimated to account for 1.36 % and 3.74 %, respectively, of total down-welling solar radiation in the UV range in summer and winter.
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