Sources and Dynamics of Submicron Aerosol during the Autumn Onset of the Air Pollution Season in Delhi, India
Sources and Dynamics of Submicron Aerosol during the Autumn Onset of the Air Pollution Season in Delhi, India
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印度德里秋季空气污染季节来临期间亚微米气溶胶的来源和动态
DOI：
10.1021/acsearthspacechem.0c00340
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发表时间：
2021
影响因子：
3.4
通讯作者：
Hildebrandt Ruiz, Lea
中科院分区：
文献类型：
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作者：
Patel, Kanan;Bhandari, Sahil;Gani, Shahzad;Campmier, Mark Joseph;Kumar, Purushottam;Habib, Gazala;Apte, Joshua;Hildebrandt Ruiz, Lea
印度新德里是世界上污染最严重的大城市，经常出现高颗粒物（PM）浓度。作为德里气溶胶超级站点研究的一部分，我们自2017年1月以来一直在德里持续测量PM 1浓度和成分。本文重点介绍了秋季，在德里污染最严重的季节之一时，PM 1浓度稳步增加，整个赛季，并可以超过1000 μg m-3在情节事件。有机气溶胶（OA）光谱的正矩阵分解表明，类似碳氢化合物的OA（HOA），生物质燃烧OA（BBOA），氧化OA（OOA），BBOA占主导地位的季节平均贡献在情节事件。我们展示了区域源，如农业燃烧在这个季节，通过污染物的时间趋势，PMF因子，气象学，和非参数风回归分析的影响。我们使用无机碎片比率来显示排灯节期间金属的影响。此外，我们证明了过渡气象在整个季节的PM 1组成的影响。总的来说，我们的分析提供了新的见解，在德里污染最严重的季节之一，控制PM 1的因素。
New Delhi, India is the most polluted megacity in the world and routinely experiences high particulate matter (PM) concentrations. As part of the Delhi Aerosol Supersite Study, we have been measuring PM1concentration and composition in Delhi continuously since January 2017. This paper focuses on autumn, one of the most polluted seasons in Delhi when PM1concentrations steadily increase throughout the season and can exceed 1000 μg m–3during episodic events. Positive matrix factorization on the organic aerosol (OA) spectrum suggests comparable seasonal average contributions from hydrocarbon-like OA (HOA), biomass burning OA (BBOA), and oxidized OA (OOA), with BBOA dominating during episodic events. We demonstrate the influence of regional sources such as agricultural burning during this season through temporal trends of pollutants, PMF factors, meteorology, and nonparametric wind regression analysis. We use inorganic fragment ratios to show the influence of metals during the festival of Diwali. Furthermore, we demonstrate the influence of transitioning meteorology in governing PM1composition through the season. Overall, our analysis provides novel insights into the factors controlling PM1during one of the most polluted seasons in Delhi.