Ozone distribution in the urban environment of Delhi during winter months

被引:53
作者
Singh, A [1 ]
Sarin, SM [1 ]
Shanmugam, P [1 ]
Sharma, N [1 ]
Attri, AK [1 ]
Jain, VK [1 ]
机构
[1] JAWAHARLAL NEHRU UNIV,SCH ENVIRONM SCI,NEW DELHI 110067,INDIA
关键词
urban pollution; motor vehicles; precursor pollutants; photochemistry; ventilation coefficient;
D O I
10.1016/S1352-2310(97)00138-6
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Measurements of ozone (O-3) and oxides of nitrogen (NOx) were carried out at six sites in Delhi during the winter months of 1993. Concentrations of ozone and NOx varied between 34 and 126 ppbv and 32 and 272 ppbv, respectively. Interestingly, ozone exhibited initial high levels during morning hours which subsequently declined to lower levels around noon. However, during evening hours a delayed build up of ozone was observed which is a departure from earlier studies. The micro-meteorological parameters like mixing height and ventilation coefficient were observed to favour dispersion of the pollutants, predominantly between 1100 and 1800 hours, whereas stable atmospheric conditions between late evening to early morning hours seem to favour accumulation of the pollutants. The paper reports some unusual winter diurnal ozone trends and speculates the possible reasons. (C) 1997 Published by Elsevier Science Ltd.
引用
收藏
页码:3421 / 3427
页数:7
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