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    Atmospheric fine and coarse mode aerosols at different environments of India and the Bay of Bengal during winter-2014: Implications of a coordinated campaign

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    Mapan-J_Metrol_Soc_India_29_273.pdf (665.8Kb)
    Date
    2014
    Author
    Sen, A.
    Ahammed, Y.N.
    Arya, B.C.
    Banerjee, T.
    Begam, R.G.
    Baruah, B.P.
    Chatterjee, A.
    Choudhuri, A.K.
    Dhir, A.
    Das, T.
    Dhyani, P.P.
    Deb, N.C.
    Gadi, R.
    Gauns, M.
    Ghosh, S.K.
    Gupta, A.
    Sharma, K.C.
    Khan, A.H.
    Kumari, K.M.
    Kumar, M.
    Kumar, A.
    Kuniyal, J.C.
    Lakhani, A.
    Meena, R.K.
    Mahapatra, P.S.
    Naqvi, S.W.A.
    Singh, D.P.
    Pal, S.
    Panda, S.
    Rohtash
    Saikia, J.
    Saikia, P.
    Sharma, A.
    Sharma, P.
    Saxena, M.
    Shenoy, D.M.
    Vachaspati, C.V.
    Sharma, S.K.
    Mandal, T.K.
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    Abstract
    In this paper, we present mass concentrations of particulate matter [PM<sub>2.5</sub>, PM<sub>10</sub> size fractions and total suspended particulates (TSP)] measured simultaneously over land stations (Kullu, Patiala, Delhi, Ajmer, Agra, Lucknow, Varanasi, Giridih, Kolkata, Darjeeling, Jorhat, Itanagar, Imphal, Bhubaneswar, and Kadapa), mostly distributed across the Indo-Gangetic plain (IGP) of India as well as in the marine atmosphere over Bay of Bengal (BoB) in the period from 20 January to 3 February, 2014. The main objective of this study was to quantify the continental outflow of particulates (PM<sub>2.5</sub>, PM<sub>10</sub> and TSP) from IGP and associated regions into the BoB along with low level north-east wind flow during winter monsoon period. The present study provides a glimpse of the aerosol loading over the IGP region. During this campaign, the highest average PM<sub>2.5</sub> (187.8 ± 36.5 µg m<sup>-3</sup>, range 125.6–256.2 µg m<sup>-3</sup>), PM<sub>10</sub> (272.6 ± 102.9 µg m<sup>-3</sup>, range 147.6–520.1 µg m<sup>-3</sup>) and TSP (325.0 ± 71.5 µg m<sup>-3</sup>, range 220.4–536.6 µg m<sup>-3</sup>) mass concentrations were recorded at Varanasi, Kolkata and Lucknow over middle and lower IGP regions. The PM<sub>2.5</sub> (average 41.3 ± 11.9 µg m<sup>-3</sup>; range 15.0–54.4 µg m<sup>-3</sup>), PM<sub>10</sub> (average 53.9 ± 18.9 µg m<sup>-3</sup>; range 30.1–82.1 µg m<sup>-3</sup>) and TSP (average 78.8 ± 29.7 µg m<sup>-3</sup>; range 49.1–184.5 µg m<sup>-3</sup>) loading over BoB were found to be comparable to land stations and suggests possible continental outflow. Over the continental region, the highest PM<sub>2.5</sub>/PM<sub>10</sub> ratio was recorded at Delhi (0.87). The PM<sub>2.5</sub>/PM<sub>10</sub> ratio over BoB (0.77) was found to be quite high and comparable to Varanasi (0.80) and Agra (0.79)
    URI
    http://drs.nio.org/drs/handle/2264/4933
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