Analysis of the photochemical production of ozone using Tropospheric Ultraviolet-Visible (TUV) Radiation Model in an Asian megacity

摘要: A study of surface layer ozone (O3) and its primary precursors (NOx = NO + NO2) was carried out at Kolkata (22° 33′ N, 88° 30′ E), an urban site in eastern India from October 2010 to April 2011. simple NOx cycle-based photochemical model for the net rate production tropospheric studied. Photolytic constants NO2 (\( {j}_{{\mathrm{NO}}_2} \)) were estimated using Tropospheric Ultraviolet Visible (TUV) Radiation Model-Version 4.1. Relationships between predicted measured data found be sensitive with respect time day. correlation observed \( \) during some case days morning (R2 range, 0.34 0.96) late afternoon 0.79 0.99) implies that chemistry is predominant due enhanced automobile emissions peak traffic hours. VOCs peroxy radicals play a vital role (net). Computed air mass backward trajectories HYSPLIT established source transport pathways trace gases. The results obtained on different indicate importance advection gases both continental as well marine case-specific circumstances. columnar outputs also compared ground-based measurements, these point towards good regional contribution NO2.