Measurement report: Source characteristics of water-soluble organic carbon in PM 2.5 at two sites in Japan, as assessed by long-term observation and stable carbon isotope ratio

Suto, Nana; Kawashima, Hiroto

The sources and seasonal trends of water-soluble organic carbon (WSOC) in carbonaceous aerosols are of significant interest. From July 2017 to July 2019, we collected samples of inline-formulaPM2.5 (particulate matter, aerodynamic inline-formuladiameter<2.5 inline-formulaµm) from one suburban and one rural site in Japan. The average inline-formulaδ13CWSOC was inline-formula M6inlinescrollmathml - normal 25.2 ± normal 1.1 58pt10ptsvg-formulamathimg9d10b745cb4ef183d14e187105d65b78 acp-21-11815-2021-ie00001.svg58pt10ptacp-21-11815-2021-ie00001.png  ‰ and inline-formula M7inlinescrollmathml - normal 24.6 ± normal 2.4 58pt10ptsvg-formulamathimg5c91807f8e785a409e1c881ab8a332e2 acp-21-11815-2021-ie00002.svg58pt10ptacp-21-11815-2021-ie00002.png  ‰ at the suburban site and rural site, respectively. At the suburban site, the inline-formulaδ13CWSOC was consistent with the inline-formulaδ13C of burned Cinline-formula3 plants, and a high correlation was found between WSOC concentrations and non-sea-salt potassium concentrations; these results suggest that the main source of WSOC at this site was biomass burning of rice straw. At the rural site, the average inline-formulaδ13CWSOC was significantly heavier from autumn to spring (inline-formula M12inlinescrollmathml - normal 23.9 ± normal 2.1 58pt10ptsvg-formulamathimg5696b61ca11399d188137627fc75820a acp-21-11815-2021-ie00003.svg58pt10ptacp-21-11815-2021-ie00003.png  ‰) than in summer (inline-formula M13inlinescrollmathml - normal 27.4 ± normal 0.7 58pt10ptsvg-formulamathimge1aedb43b45ac4da48d1db22ed827db5 acp-21-11815-2021-ie00004.svg58pt10ptacp-21-11815-2021-ie00004.png  ‰) (inline-formulap<0.01). The inline-formulaδ13CWSOC from autumn to spring was consistent with that of biomass burning of rice straw, whereas that in summer was considered to reflect mainly the formation of secondary organic aerosols from biogenic volatile organic compounds (VOCs). The heaviest inline-formulaδ13CWSOC (inline-formula M17inlinescrollmathml - normal 21.3 ± normal 1.9 58pt10ptsvg-formulamathimgbf8deb4fbb17938b1e70ec805f4897af acp-21-11815-2021-ie00005.svg58pt10ptacp-21-11815-2021-ie00005.png  ‰) was observed from February to April 2019, which may be explained by long-range transport of Cinline-formula4 plant burning such as corn from overseas. Thus, the present study indicates that inline-formulaδ13CWSOC is potentially useful for elucidating the sources and atmospheric processes that contribute to seasonal variations of WSOC concentration.

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Suto, Nana / Kawashima, Hiroto: Measurement report: Source characteristics of water-soluble organic carbon in PM2.5 at two sites in Japan, as assessed by long-term observation and stable carbon isotope ratio. 2021. Copernicus Publications.

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