Abstract
Daytime and nighttime PM10 samples were collected during summer (June) and winter (February) at a representative urban site in Mumbai, located on the western coast of Indian subcontinent. Samples were studied for molecular distribution of water-soluble dicarboxylic acids, oxoacids and dicarbonyls as well as total carbon (TC), water-soluble organic carbon (WSOC), inorganic ions along with specific markers (levoglucosan, K+) to better understand sources and formation processes of organic aerosols in Mumbai. The distribution of water-soluble organics was characterised by high abundance of oxalic acid (C2), followed by phthalic (Ph), terephthalic (tPh), azelaic (C9), malonic (C3), and succinic acids (C4). Positive correlations between C2, sulfate and glyoxal (ωC2) suggest secondary production of C2 predominantly via aqueous phase chemistry. C2 also showed positive correlation with K+ and levoglucosan indicating that biomass/biofuel burning is the potential source of diacids in the Mumbai aerosols. In addition, higher average contributions of total diacids to WSOC and OC in winter than in summer suggest that aerosols were aged i.e., photochemically well processed in winter in Mumbai. On the other hand, diurnal change in their ratios is observed with higher ratio in daytime samples than that of previous and succeeding nighttime samples, suggesting diacids are also influenced from local sources in both the seasons. This study demonstrates that biomass burning as well as biogenic sources are important sources influencing the distributions of aerosols in Mumbai.
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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
The authors are thankful to Director, NPL, New Delhi for all the support and encouragement. AK is thankful to University Grant Commission (UGC) for providing the fellowship under Project No. 90802 (UGC-SRF fellowship). Also, this study is in part supported by the Japanese Ministry of Education, Science, Sport and Culture (grant-in-aid No. 17340166 and 19204055), and by the Environment Research and Technology Development Fund (B-0903) of the Ministry of the Environment, Japan.We thank Prof. Rashmi Patil and Dr. G.S. Umarji, IIT-B, Mumbai for their help in sample collection. This work is a part of the collaborative research project “Molecular Characterisation and Hygroscopicity of Indian Aerosols (MOCHIA)”.
Funding
This research was supported by University Grant Commission (UGC, India) under Project No. 90802 (UGC-SRF fellowship), in part by the Japanese Ministry of Education, Science, Sport and Culture (grant-in-aid No. 17340166 and 19204055), and by the Environment Research and Technology Development Fund (B-0903) of the Ministry of the Environment, Japan.
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AKA did data analysis and prepared draft of the manuscript. SGA conceptualized the study and performed chemical analysis, reviewed the manuscript. KS help in preparation for sampling. DS reviewed the draft manuscript. KK conceptualized the study and reviewed the manuscript.
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Alang, A.K., Aggarwal, S.G., Singh, K. et al. Water-soluble dicarboxylic acids, oxoacids and α-dicarbonyls in the tropical aerosols in coastal megacity Mumbai: molecular characteristics and formation processes. J Atmos Chem 80, 137–155 (2023). https://doi.org/10.1007/s10874-022-09442-3
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DOI: https://doi.org/10.1007/s10874-022-09442-3