-, Saraswati and Sharma, S. K. and Mandal, T. K. (2018) Five-year measurements of ambient ammonia and its relationships with other trace gases at an urban site of Delhi, India. Meteorology and Atmospheric Physics, 130 (2). pp. 241-257. ISSN 0177-7971

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In this study, we present the 5-year measurements of ambient ammonia (NH3), oxides of nitrogen (NO and NO2) and carbon monoxide (CO) along with the meteorological parameters at an urban site of Delhi, India from January 2011 to December 2015. The average mixing ratios of ambient NH3, NO, NO2 and CO over the entire period of observations were recorded as 19.3 +/- 4.4 (ppb), 20.1 +/- 5.9 (ppb), 18.6 +/- 4.6 (ppb) and 1.8 +/- 0.5 (ppm), respectively. The mixing ratios of NH3, NO, NO2 and CO were recorded highest during winter season, followed by summer and monsoon season. In the present case, a substantial seasonal variation of NH3 was observed during all the seasons except NO, NO2 and CO. The results emphasized that the traffic could be one of the significant sources of ambient NH3 at the urban site of Delhi as illustrated by positive correlations of NH3 with traffic related pollutants (NO (x) and CO). Surface wind as well as back trajectory analysis also supports the road side traffic and agricultural activities at the nearby area indicating possible major sources of ambient NH3 at observational site. Trajectory analysis, potential source contribution function and concentration weighted trajectory analysis indicated the surrounding nearby areas (NCR, Haryana, Punjab, Rajasthan and Uttar Pradesh) as a significant source region of ambient NH3 at the observational site of Delhi.

Item Type: Article
Additional Information: Copyright for this article belongs to M/s Springer Verlag.
Subjects: Meteorology & Atmospheric Sciences
Depositing User: Mr. Yogesh Joshi
Date Deposited: 21 Nov 2019 07:26
Last Modified: 21 Nov 2019 07:26
URI: http://npl.csircentral.net/id/eprint/3903

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