Song, Wenhuai; Hong, Yihang; Zhang, Yuxian; Cao, Fang; Rauber, Martin; Santijitpakdee, Teetawat; Kawichai, Sawaeng; Prapamontol, Tippawan; Szidat, Sönke; Zhang, Yan‐Lin (2024). Biomass Burning Greatly Enhances the Concentration of Fine Carbonaceous Aerosols at an Urban Area in Upper Northern Thailand: Evidence From the Radiocarbon‐Based Source Apportionment on Size‐Resolved Aerosols. Journal of Geophysical Research: Atmospheres, 129(10) American Geophysical Union 10.1029/2023JD040692
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To study the role of biomass burning (BB) in air pollution at upper‐northern Thailand, the source apportionment of size‐resolved carbonaceous aerosols from Chiang Mai was carried out based on the radiocarbon (14C) analysis. The fraction of modern carbon (F14C) was generally decreased with particle size increasing and with the highest and lowest values of 0.90 ± 0.04 and 0.61 ± 0.04, respectively. Elemental carbon, regardless of emission sources, and BB‐derived organic carbon (OCbb) showed unimodal size distribution patterns with peaks at 0.43–0.65 μm. Fossil‐fuel derived‐OC (OCf) displayed a bimodal mode with the major peak at 2.1–10 μm, and the minor one at 0.43–0.65 μm. The biogenic secondary organic aerosols (BSOA) showed a typical fine‐mode unimodal size distribution pattern during the high BB (HBB) season, and a bimodal mode during the low BB season. The BSOA concentration increased by 189% ± 80% due to the interaction with open BB plums during HBB season, which was quantified by a 14C‐involved random forest model. Besides, the concentration of biogenic primary organic aerosols also showed a significant increment during the HBB season, especially in sub‐microns. Our results highlight the critical importance of controlling open fires to reduce air pollutants and the potential exposure risk.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR) 08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP) |
UniBE Contributor: |
Song, Wenhuai, Rauber, Martin, Szidat, Sönke |
Subjects: |
500 Science > 570 Life sciences; biology 500 Science > 540 Chemistry |
ISSN: |
2169-897X |
Publisher: |
American Geophysical Union |
Language: |
English |
Submitter: |
Sönke Szidat |
Date Deposited: |
12 Jul 2024 13:47 |
Last Modified: |
12 Jul 2024 13:47 |
Publisher DOI: |
10.1029/2023JD040692 |
BORIS DOI: |
10.48350/198969 |
URI: |
https://boris.unibe.ch/id/eprint/198969 |
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