Seasonal variability of ambient NH_3, NO, NO_2 and SO_2 over Delhi  

作　　者：S.K.Sharma A.Datta T.Saud M.Saxena T.K.Mandal Y.N.Ahammed B.C.Arya 

机构地区：[1]Radio and Atmospheric Sciences Division, National Physical Laboratory, Council of Scientific and Industrial Research (CSIR)

出　　处：《Journal of Environmental Sciences》2010年第7期1023-1028,共6页环境科学学报（英文版）

基　　金：the Department of Science and Technology,Government of India, New Delhi for financial support(Grant No. SR/S4/AS:12/2008)

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 ofO3.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 ofO3.

关 键 词：ambient NH3  diurnal and seasonal variations chemiluminescence method ambient NO  NO2 and SO2 

分 类 号：X51[环境科学与工程—环境工程]