Articles | Volume 30, issue 2
ANGEO Communicates
16 Feb 2012
ANGEO Communicates |  | 16 Feb 2012

Measurement of ambient NH3 over Bay of Bengal during W_ICARB Campaign

S. K. Sharma, A. K. Singh, T. Saud, T. K. Mandal, M. Saxena, S. Singh, S. K. Ghosh, and S. Raha

Abstract. Concentrations of ambient NH3, NO, NO2 and SO2 were measured over Bay of Bengal (BoB) during 28 December 2008 to 25 January 2009 to study their diurnal variation and relationship of NH3 with other trace gases over BoB. The measurements were done under the winter phase of Integrated Campaign on Aerosols and Radiation Budget (W_ICARB). For the first time, ambient NH3 was monitored precisely over BoB based on chemiluminescence method, having estimation efficiency more precise than the chemical trap method. The average concentration of ambient NH3, NO, NO2 and SO2 were recorded as 4.78 ± 1.68, 1.89 ± 1.26, 0.31 ± 0.14 and 0.80 ± 0.30 μg m−3, respectively, over BoB. The prominent latitudinal and longitudinal variations of the trace gases were observed over BoB, whereas NH3 and NO showed the non-significant diurnal variation. Results reveal that the concentration of ambient NH3 negatively correlated with ambient NO2 (r2 = −0.56), SO2 (r2 = −0.58) and ambient temperature (r2 = −0.27) during the study.