Application of satellite observations for identifying regions of dominant sources of nitrogen oxides over the Indian Subcontinent

摘要: [1] We used SCIAMACHY (10:00 LT) and OMI (13:30 tropospheric NO2 columns to study diurnal seasonal patterns in concentrations over India. Using characteristics of variability columns, we present a simple methodology identify the dominant NOx source category for specific regions Regions where is classified as biomass burning are found generally agree with ATSR fire count distribution. Relating surface emission, find that emission account an average flux 1.55 × 1011 molecules cm−2 s−1 during peak period. Furthermore, extrapolating this estimated total burned area year 2005, 72 Gg N emissions. Additional analysis events Northeast India shows marked increase TES retrieved O3 concentrations, suggesting significant photochemical ozone formation type was categorized anthropogenic good agreement distribution major industrial urban centers Tropospheric these increased by 3.8% per between 2003 2011, which consistent growth oil coal consumption The OMI-derived mixing ratios indirectly validated situ measurements (correlation r = 0.85, n = 88) obtained from air quality monitoring network Delhi August 2010 January 2011. Most values surface-based measurements, supporting direct utility observation estimates. Finally, use estimate emissions selected large cites thermal power plants compare estimates INTEX-B EDGAR inventory. We that, few locations, show fair agreement; however, many differ inventories.