{"title":"基于14C和有机分子示踪剂的长江三角洲地区有机气溶胶源分析","authors":"Changliu Wu, Fang Cao, Yuxian Zhang, Wenhuai Song, Qianli Ma, Xiaofang Jia, Lei Ren, Xiaoying Yang, Mingyuan Yu, Sönke Szidat, Yanlin Zhang","doi":"10.1029/2024JD043296","DOIUrl":null,"url":null,"abstract":"<p>To clarify the relative importance of anthropogenic and biogenic sources on organic aerosol (OA) in the background atmosphere, fossil and nonfossil contributions to both primary and secondary OA in fine aerosols (PM<sub>2.5</sub>) were quantified at the regional receptor site in the Yangtze River Delta (YRD) region of China by measurements of dual-carbon isotopes (<sup>14</sup>C and <sup>13</sup>C) and organic tracers. Nonfossil sources dominated organic carbon (OC) with an average contribution of 58 ± 9%. Biogenic emissions dominated nonfossil OC during spring (68 ± 29%) and summer (86 ± 6%), while biomass burning emissions dominated in winter (87 ± 15%) and autumn (51 ± 8%). More than half of the biogenic-derived OC in spring (58 ± 23%) and summer (64 ± 21%) originated from secondary formation, with monoterpene (35 ± 16%) and isoprene (49 ± 25%) as main secondary organic aerosol (SOA) precursors, respectively. The SOC contributed the most anthropogenic-derived (i.e., fossil and biomass burning sources) OC with an average contribution of 71 ± 9%. In addition, anthropogenic OC was notably high during winter (93 ± 7%) and autumn (74 ± 5%), underscoring the significant impact of regional pollution transport on background aerosol. Correlations between anthropogenic pollutants and biogenic-derived SOC indicated that mixed contributions from anthropogenic and biogenic emissions promoted SOA formation. This interaction may partially explain the relatively higher fractions of SOC in nonfossil (>60%) and fossil OC (>70%) at the background site of the YRD region compared to other global background sites.</p>","PeriodicalId":15986,"journal":{"name":"Journal of Geophysical Research: Atmospheres","volume":"130 14","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2025-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Source Apportionment of Organic Aerosol Using 14C and Organic Molecular Tracers at a Regional Background Site of the Yangtze River Delta Region, China\",\"authors\":\"Changliu Wu, Fang Cao, Yuxian Zhang, Wenhuai Song, Qianli Ma, Xiaofang Jia, Lei Ren, Xiaoying Yang, Mingyuan Yu, Sönke Szidat, Yanlin Zhang\",\"doi\":\"10.1029/2024JD043296\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>To clarify the relative importance of anthropogenic and biogenic sources on organic aerosol (OA) in the background atmosphere, fossil and nonfossil contributions to both primary and secondary OA in fine aerosols (PM<sub>2.5</sub>) were quantified at the regional receptor site in the Yangtze River Delta (YRD) region of China by measurements of dual-carbon isotopes (<sup>14</sup>C and <sup>13</sup>C) and organic tracers. Nonfossil sources dominated organic carbon (OC) with an average contribution of 58 ± 9%. Biogenic emissions dominated nonfossil OC during spring (68 ± 29%) and summer (86 ± 6%), while biomass burning emissions dominated in winter (87 ± 15%) and autumn (51 ± 8%). More than half of the biogenic-derived OC in spring (58 ± 23%) and summer (64 ± 21%) originated from secondary formation, with monoterpene (35 ± 16%) and isoprene (49 ± 25%) as main secondary organic aerosol (SOA) precursors, respectively. The SOC contributed the most anthropogenic-derived (i.e., fossil and biomass burning sources) OC with an average contribution of 71 ± 9%. In addition, anthropogenic OC was notably high during winter (93 ± 7%) and autumn (74 ± 5%), underscoring the significant impact of regional pollution transport on background aerosol. Correlations between anthropogenic pollutants and biogenic-derived SOC indicated that mixed contributions from anthropogenic and biogenic emissions promoted SOA formation. This interaction may partially explain the relatively higher fractions of SOC in nonfossil (>60%) and fossil OC (>70%) at the background site of the YRD region compared to other global background sites.</p>\",\"PeriodicalId\":15986,\"journal\":{\"name\":\"Journal of Geophysical Research: Atmospheres\",\"volume\":\"130 14\",\"pages\":\"\"},\"PeriodicalIF\":3.4000,\"publicationDate\":\"2025-07-13\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Geophysical Research: Atmospheres\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1029/2024JD043296\",\"RegionNum\":2,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"METEOROLOGY & ATMOSPHERIC SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Geophysical Research: Atmospheres","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1029/2024JD043296","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"METEOROLOGY & ATMOSPHERIC SCIENCES","Score":null,"Total":0}
Source Apportionment of Organic Aerosol Using 14C and Organic Molecular Tracers at a Regional Background Site of the Yangtze River Delta Region, China
To clarify the relative importance of anthropogenic and biogenic sources on organic aerosol (OA) in the background atmosphere, fossil and nonfossil contributions to both primary and secondary OA in fine aerosols (PM2.5) were quantified at the regional receptor site in the Yangtze River Delta (YRD) region of China by measurements of dual-carbon isotopes (14C and 13C) and organic tracers. Nonfossil sources dominated organic carbon (OC) with an average contribution of 58 ± 9%. Biogenic emissions dominated nonfossil OC during spring (68 ± 29%) and summer (86 ± 6%), while biomass burning emissions dominated in winter (87 ± 15%) and autumn (51 ± 8%). More than half of the biogenic-derived OC in spring (58 ± 23%) and summer (64 ± 21%) originated from secondary formation, with monoterpene (35 ± 16%) and isoprene (49 ± 25%) as main secondary organic aerosol (SOA) precursors, respectively. The SOC contributed the most anthropogenic-derived (i.e., fossil and biomass burning sources) OC with an average contribution of 71 ± 9%. In addition, anthropogenic OC was notably high during winter (93 ± 7%) and autumn (74 ± 5%), underscoring the significant impact of regional pollution transport on background aerosol. Correlations between anthropogenic pollutants and biogenic-derived SOC indicated that mixed contributions from anthropogenic and biogenic emissions promoted SOA formation. This interaction may partially explain the relatively higher fractions of SOC in nonfossil (>60%) and fossil OC (>70%) at the background site of the YRD region compared to other global background sites.
期刊介绍:
JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.