☆ 4.2 Article

Seasonal variability of ambient NH3, NO, NO2 and SO2 over Delhi

JOURNAL OF ENVIRONMENTAL SCIENCES (2010)

期刊

JOURNAL OF ENVIRONMENTAL SCIENCES

卷 22, 期 7, 页码 1023-1028

出版社

SCIENCE PRESS

DOI: 10.1016/S1001-0742(09)60213-8

关键词

ambient NH3; diurnal and seasonal variations; chemiluminescence method; ambient NO, NO2 and SO2

类别

Environmental Sciences

资金

RASD, National Physical Laboratory, New Delhi, India
Department of Science and Technology, Government of India, New Delhi [SR/S4/AS:12/2008]
CSIR, New Delhi

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摘要

We present the diurnal and seasonal variability of ambient NH3, NO, NO2 and SO2 over Delhi, India. Ambient NH3, NO and NO2 were measured continuously during winter, summer and autumn seasons using NH3- and NOx-analyzer, which operates by chemiluminescence method with a higher estimation efficiency (> 90%) than the chemical trap method (reproducibility 4.7%). Prominent diurnal, day-to-day and seasonal variations of ambient mixing ratio of NH3, NO, NO2 and SO2 were observed during the study period. Seasonal variation with higher mixing ratio in winter was observed for all measured trace gases except NO. Day-night variation of all measured trace gases observed was higher in winter in comparison with summer. Late morning increase in NO2 mixing ratio might be attributed to conversion of NO to NO2 with the interaction of O-3.

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