期刊
ENVIRONMENTAL POLLUTION
卷 256, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2019.113401
关键词
Dicarboxylic acids; Aging process; Aerosol liquid water content; Aqueous-phase formation; Stable carbon isotopic composition
资金
- National Key R&D Program of China [2017YFC0210000]
- National Natural Science Foundation of China [41773117]
- National Natural Science Funds for Distinguished Young Scholars of China [41325014]
This study reveals the impact of biomass burning (BB) on secondary organic aerosols (SOA) formation in the North China Plain (NCP). Filter samples were analyzed for secondary inorganic aerosols (SIA), oxalic acid (C-2) and related aqueous-phase SOA compounds (aqSOA), stable carbon isotope composition of C-2(delta C-13(C-2)) and aerosol liquid water content (ALWC). Based on the PM2.5 loadings, BB tracer concentrations, wildfire spots and air-mass back trajectories, we distinguished two episodes from the whole campaign, Episode I and Episode II, which were characteristic of regional and local BB, respectively. The abundances of PM2.5 and organic matter in the two events were comparable, but concentrations and fractions of SIA, aqSOA during Episode I were much higher than those during Episode II, along with heavier delta C-13(C-2), suggesting an enhanced aqSOA formation in the earlier period. We found that the enhancement of aqSOA formation during Episode I was caused by an increased ALWC, which was mainly driven by SIA during the regional BB event. Our work showed that intensive burning of crop residue in East Asia can sharply enhance aqSOA production on a large scale, which may have a significant impact on the regional climate and human health. (C) 2019 Elsevier Ltd. All rights reserved.
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