Spatial variability in ambient atmospheric fine and coarse mode aerosols over Indo-Gangetic plains, India and adjoining oceans during the onset of summer monsoons, 2014
| Autor: | Mohit Saxena, Yadiki Nazeer Ahammed, Sangita Goel, Shrimanta Pal, Altaf Hussain Khan, Abhijit Chatterjee, A. B. Sen, Anil K. Choudhuri, A. Sharma, Chaturvedula Viswanatha Vachaspati, Padma S. Rao, Tirthankar Banerjee, Trupti Das, Amit Dhir, Vishnu Murari, N. C. Deb, Tuhin Kumar Mandal, Sudhir Kumar Sharma |
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| Rok vydání: | 2016 |
| Předmět: |
Atmospheric Science
010504 meteorology & atmospheric sciences Westerlies 010501 environmental sciences Particulates Monsoon 01 natural sciences Pollution Arid Aerosol Troposphere Climatology Environmental science Spatial variability Waste Management and Disposal Bay 0105 earth and related environmental sciences |
| Zdroj: | Atmospheric Pollution Research. 7:521-532 |
| ISSN: | 1309-1042 |
| Popis: | Enhanced transport of dust with the prevailing mid to upper tropospheric westerly winds from arid regions in South-west Asia and North-west India into the Indo-Gangetic Plain (IGP) and the influx of marine aerosol from the Arabian Sea (AS), Tropical Indian Ocean (TIO) and Southern Bay of Bengal (SBoB) into India along with the low level south-west wind flow during the onset of the South-west (SW) monsoon, 2014 was observed in campaign mode. Ambient airborne particulates (PM 2.5 and PM 10 ) were collected at 9 sites in and around IGP, India, viz. Patiala, Delhi, Lucknow, Varanasi, Giridih, Kolkata, Darjeeling, Bhubaneswar and Nagpur; over AS, TIO and SBoB providing a glimpse into the aerosol loading and its transport mechanisms. The highest average PM 2.5 (61.8 ± 18.6 μg m −3 ) and PM 10 (182.2 ± 58.0 μg m −3 ) mass concentrations were recorded at Delhi (upper IGP) and Lucknow (middle IGP) respectively. Average PM 2.5 (18.1 ± 10.1 μg m −3 ) and PM 10 (39.6 ± 15.8 μg m −3 ) levels recorded over the open oceanic regions in AS, TIO and SBoB were much lower than those observed over the land stations and the average PM 2.5 recorded over coastal AS and SBoB (49.1 ± 28.7 μg m −3 ). Cluster analysis, Potential Source Contribution Function (PSCF) and Concentration Weighted Trajectory (CWT) analysis portray that PM 2.5 and PM 10 levels at the land stations were influenced by weak to moderate contributions from AS, BoB, the arid South-west Asia and North-west India, peninsular India and from the polluted IGP region. |
| Databáze: | OpenAIRE |
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