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Organic and elemental carbon variation in PM2.5 over megacity Delhi and Bhubaneswar, a semi-urban coastal site in India

Author

Listed:
  • Sipra Panda

    (CSIR-Institute of Minerals and Materials Technology)

  • S. K. Sharma

    (CSIR-National Physical Laboratory)

  • Parth Sarathi Mahapatra

    (CSIR-Institute of Minerals and Materials Technology
    CSIR-Institute of Minerals and Materials Technology)

  • Upasana Panda

    (CSIR-Institute of Minerals and Materials Technology)

  • Satyajit Rath

    (CSIR-Institute of Minerals and Materials Technology)

  • Minakshi Mahapatra

    (CSIR-Institute of Minerals and Materials Technology)

  • T. K. Mandal

    (CSIR-National Physical Laboratory)

  • Trupti Das

    (CSIR-Institute of Minerals and Materials Technology)

Abstract

This paper presents the effect of meteorology, long-range transport, boundary layer and anthropogenic activities on the chemical composition of aerosol (PM2.5) particularly carbonaceous aerosol (OC, EC TC) in two Indian cities, namely Delhi and Bhubaneswar. The climatological and demographical differences in the two cities have compelled the authors to compare concentrations of atmospheric organic carbon (OC) and elemental carbon (EC) in PM2.5 at Delhi and Bhubaneswar during winter 2013 (Dec 2012 to Feb 2013). Although, Delhi is a densely populated megacity with several anthropogenic activities, Bhubaneswar is a comparatively less dense small coastal city. The percentage contribution of total carbon (TC) to PM2.5 mass was higher as recorded at Bhubaneswar (~30.38 %) as compared to Delhi (~15 %). Average ratios of OCtot/EC, K+/OCtot and K+/EC were recorded as 1.88 ± 0.24, 0.006 ± 0.004 and 0.018 ± 0.013 at Bhubaneswar, respectively, whereas in Delhi, respective average ratios of OCtot/EC, K+/OCtot and K+/EC were recorded as 1.37 ± 0.16, 0.230 ± 0.066 and 0.321 ± 0.122. OCtot/EC, K+/OCtot, K+/EC ratios and eight carbon fraction analysis of PM2.5 mass revealed the dominant contribution of fossil fuel specifically from coal combustion at Bhubaneswar, whereas vehicular exhaust, fossil fuel combustion along with biomass burning and road dust were the main sources of emission at Delhi. Long-range transport and prevailing meteorology had a major impact on the respective pollutants at Bhubaneswar, and OCtot and EC of PM2.5 mass over Delhi were believed to have originated from local sources due to shallow boundary layer, stable meteorology and high anthropogenic activities during the observation period. Besides, secondary organic carbon (OCsec) contributed 15.76 ± 8.41 and 14.65 ± 7.46 % to OCtot concentration of Bhubaneswar and Delhi, respectively.

Suggested Citation

  • Sipra Panda & S. K. Sharma & Parth Sarathi Mahapatra & Upasana Panda & Satyajit Rath & Minakshi Mahapatra & T. K. Mandal & Trupti Das, 2016. "Organic and elemental carbon variation in PM2.5 over megacity Delhi and Bhubaneswar, a semi-urban coastal site in India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 80(3), pages 1709-1728, February.
    • Handle: RePEc:spr:nathaz:v:80:y:2016:i:3:d:10.1007_s11069-015-2049-3
    DOI: 10.1007/s11069-015-2049-3
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    References listed on IDEAS

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    1. S. Tiwari & A. Srivastava & D. Bisht & P. Safai & P. Parmita, 2013. "Assessment of carbonaceous aerosol over Delhi in the Indo-Gangetic Basin: characterization, sources and temporal variability," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 65(3), pages 1745-1764, February.
    2. Claire Granier & Bertrand Bessagnet & Tami Bond & Ariela D’Angiola & Hugo Denier van der Gon & Gregory Frost & Angelika Heil & Johannes Kaiser & Stefan Kinne & Zbigniew Klimont & Silvia Kloster & Jean, 2011. "Evolution of anthropogenic and biomass burning emissions of air pollutants at global and regional scales during the 1980–2010 period," Climatic Change, Springer, vol. 109(1), pages 163-190, November.
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