In:
Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 129, No. 2 ( 2024-01-28)
Abstract:
Both the loading and light‐absorbing capacity of water‐soluble brown carbon (WSBrC) are high in China, but little is known about sources and atmospheric processes of strong light‐absorbing components in WSBrC. Humic‐like substances (HULIS) account for a significant fraction of light absorption by WSBrC, which may contain strong light‐absorbing components. Through dual carbon isotopic analysis, we discovered that HULIS‐C from 10 Chinese cities had relatively higher fossil sources contribution but lower δ 13 C values compared to non‐HULIS‐C. This indicates that the fossil components in HULIS not only possess a higher light‐absorbing capacity but are also more resistant to oxidative aging than non‐fossil components. The higher light‐absorbing capacity and resilience of fossil components can be attributed to the enrichment of aromatic compounds derived from coal combustion. Using the non‐negative matrix factorization model, we found that coal combustion tends to generate aromatic compounds with higher molecular weight and lower oxidation‐to‐carbon (O/C: 0.31 ± 0.03 vs. 0.50 ± 0.07) ratios than biomass burning. This characteristic may contribute to the recalcitrant property of coal combustion‐derived HULIS. Our findings highlight that coal combustion‐derived BrC may persists longer in the atmosphere and has a greater long‐term impact on climate than that derived from biomass burning.
Type of Medium:
Online Resource
ISSN:
2169-897X
,
2169-8996
DOI:
10.1029/2023JD039512
Language:
English
Publisher:
American Geophysical Union (AGU)
Publication Date:
2024
detail.hit.zdb_id:
710256-2
detail.hit.zdb_id:
2016800-7
detail.hit.zdb_id:
2969341-X
SSG:
16,13
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