Emission ratio of carbonaceous aerosols observed near crop residual burning sources in a rural area of the Yangtze River Delta Region, China

X. L. Pan, Y. Kanaya, Z. F. Wang, F. Taketani, H. Tanimoto, H. Irie, H. Takashima, S. Inomata

    研究成果: Contribution to journalArticle査読

    24 被引用数 (Scopus)

    抄録

    Intensive open crop residue burning (OCRB) has a great impact on regional air quality and climate. A field observation campaign in a rural area of the Yangtze River Delta Region (YRDR) was performed during the harvest season, and Elemental carbon (ECa), organic carbon (OC), black carbon (BC e), carbon monoxide (CO), carbon dioxide (CO2) and PM 2.5 mass were concurrently measured. During the observation period, urban pollution and OCRB-impact episodes were classified. The emission ratio of ECa mass (defined as the ECa/CO ratio) from OCRB was estimated to be 18.2 4.6 ng/m3/ppbv, much higher than that (3.0 0.3 ng/m3/ppbv) of urban pollution from the YRDR. A significant amount of OC was emitted from OCRB with OC/CO ratio of 101.3 41.6 ng/m3/ppbv. The value found in the present study was near the upper limit of OC emission ratios in the literature, implying great impacts from combustion conditions, types of biomass burned and subsequent evolution. Regarding urban pollution episodes, the OC/CO ratio was found to be 23.7 2.4 ng/m3/ppbv, and secondary organics accounted for the major fraction of OC mass. Combustions phases of OCRB were classified according to a modified combustion efficiency (MCE, defined as CO2/(CO + CO2)). Our results support the view that ECa tend to be produced in flaming combustions (MCE > 0.95) than in smoldering combustions (MCE < 0.95), whereas OC is emitted preferentially from smoldering combustions. Based on our observed carbonaceous aerosol correlations, we estimate that the ECa and OC emissions from OCRB in East Asia might be underestimated by at least 50%.

    本文言語英語
    論文番号D22304
    ジャーナルJournal of Geophysical Research Atmospheres
    117
    22
    DOI
    出版ステータス出版済み - 2012

    All Science Journal Classification (ASJC) codes

    • 地球物理学
    • 林業
    • 海洋学
    • 水圏科学
    • 生態学
    • 水の科学と技術
    • 土壌科学
    • 地球化学および岩石学
    • 地表過程
    • 大気科学
    • 地球惑星科学(その他)
    • 宇宙惑星科学
    • 古生物学

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