Detection of surface emission hot spots, trends, and seasonal cycle from satellite‐retrieved NO₂ over India

Abstract

on board Envisat, respectively, for the time period of 1996-2006 have been used to identify major NO 2 emission hot spots, trends, and seasonal cycle over different regions of India. Emission hot spots are observed over the locations of thermal power plants and over major urban and industrial regions. A multifunctional regression model has been used to analyze the trends and seasonal cycle over these emission hot spots. Increasing trends of $1.65 ± 0.52% a À1 have been observed for NO 2 over India. The fast growing industrial regions of Mumbai and Delhi show increasing trends of $2.1 ± 1.1 and $2.4 ± 1.2% a À1 , respectively. Seasonal variations of tropospheric NO 2 concentrations show a maximum during winter-summer (December-May) and a minimum during the monsoon seasons (June-September). The observed seasonal cycle in satellite-derived NO 2 agrees well with the surface-level observations of NO X .Citation: Ghude, S. D., S. Fadnavis, G. Beig, S. D. Polade, and R. J. van der A (2008), Detection of surface emission hot spots, trends, and seasonal cycle from satellite-retrieved NO 2 over India,

Recent climate and air pollution impacts on Indian agriculture

“…Studies suggest that in the summer monsoon months NOx and ozone concentrations are higher than in winter, and remain higher in those two states than elsewhere (44)(45)(46). This finding may be because of higher temperatures (47) and higher concentrations of NMVOCs from biomass burning (48,49) [traditionally one of the biggest sources of uncertainty in emissions inventories (50)] during the rice growing season.…”

Recent satellite-based trends of tropospheric nitrogen dioxide over large urban agglomerations worldwide

“…A combination of GOME and SCIAMACHY data was also used by Ghude et al (2009) for studying regional trends in tropospheric NO 2 . Using a similar methodology, NO 2 trends over emission hotspots in India were further studied by Ghude et al (2008). Hayn et al (2009) used generalized additive models to study spatiotemporal patterns in tropospheric NO 2 columns derived from GOME data between 1996 and 2001.…”

Ozone trends in the vertical structure of Upper Troposphere and Lower stratosphere over the Indian monsoon region

“…peroxy). Ghude et al (2008) observed increasing trends in NO 2 over the Indian region during Indian monsoon season. Thus increasing trends in NO x may result in increasing ozone trends in upper troposphere.…”

“…Increasing trends in lightning flashes will contribute to increasing ozone trends (via NO x ) in the upper troposphere. Ghude et al (2008) reported increasing trends in NO x concentrations in the troposphere over the Indian region. Increasing trends in convective events, lightning activity and NO x will together contribute to increasing ozone trends in the upper troposphere by enhancing production of ozone (IPCC 2007;Ott et al 2010;Labrador et al 2005).…”

“…From ozonesonde measurements, trends in the Indian troposphere and lower stratosphere were reported by Saraf and Beig (2004). These trends have been attributed to significant increase in anthropogenic emission of ozone precursors from South Asia during past couple of decades due to strong industrial and economic growth in this region (Beig et al 2008;Lal and Pawar 2011;Kulkarni et al 2010;Wang et al 2012;Ghude et al 2008;Krishnamurti et al 2009). To our knowledge, ozone trends in the UTLS region are not well studied over the India where significant transport of air from surface to UTLS through deep convection (Randel et al 2010) and STE occurs during monsoon season.…”