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Assessment of carbonaceous aerosol over Delhi in the Indo-Gangetic Basin: characterization, sources and temporal variability

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  • S. Tiwari
  • A. Srivastava
  • D. Bisht
  • P. Safai
  • P. Parmita

Abstract

Semi-continuous measurements of organic carbon (OC) and elemental carbon (EC) and continuous measurements of black carbon (BC) and PM 2.5 aerosols were conducted simultaneously during the winter period of 2010–2011 at Delhi, one of the polluted urban megacities in western part of the Indo-Gangetic Basin region. The average mass concentrations of OC, EC, BC and PM 2.5 were about 54 ± 39, 10 ± 5, 12 ± 5 and 210 ± 146 μg m −3 , respectively. Contribution of total carbonaceous aerosol mass to PM 2.5 mass was found to be ~46 %. Average OC/EC ratio was found to be 5 ± 2 during the study period, suggesting the presence of secondary organic aerosols in the atmosphere over Delhi. Estimated mean secondary organic aerosol mass concentration was found to be 25 μg m −3 and varied between 14.6 (February) and 37.0 μg m −3 (December). A diurnal variation of OC and EC shows lower values during the day time and higher during the morning and night, which are highly associated with the corresponding variability in mixing layer heights. OC and EC were also found to be significantly correlated (r = 0.71) to each other, indicating their common sources. Concentrations of OC and EC were about 45 and 13 % higher during weekdays than weekends, respectively. Higher OC (67 %) and EC (53 %) were observed in the late evening during weekdays than those on weekends, which could be due to different emission sources during these two periods. The night/day ratio of EC and OC was found to be larger than 1.0, suggesting the relative accumulation of EC and OC near the surface at night hours. Copyright Springer Science+Business Media Dordrecht 2013

Suggested Citation

  • 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.
    • Handle: RePEc:spr:nathaz:v:65:y:2013:i:3:p:1745-1764
    DOI: 10.1007/s11069-012-0449-1
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    References listed on IDEAS

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    1. Arun K. Attri & Ujjwal Kumar & V. K. Jain, 2001. "Formation of ozone by fireworks," Nature, Nature, vol. 411(6841), pages 1015-1015, June.
    2. Mark Z. Jacobson, 2001. "Strong radiative heating due to the mixing state of black carbon in atmospheric aerosols," Nature, Nature, vol. 409(6821), pages 695-697, February.
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    Cited by:

    1. 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.
    2. S. Tiwari & D. Bisht & A. Srivastava & Örjan Gustafsson, 2015. "Simultaneous measurements of black carbon and PM 2.5 , CO, and NO x variability at a locally polluted urban location 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. 75(1), pages 813-829, January.
    3. Sipra Panda & S. Sharma & Parth Mahapatra & Upasana Panda & Satyajit Rath & Minakshi Mahapatra & T. Mandal & Trupti Das, 2016. "Organic and elemental carbon variation in PM 2.5 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.

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