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Multi-year satellite observations of tropospheric \(\hbox {NO}_{2}\) concentrations over the Indian region

  • M K Madhav HaridasEmail author
  • Biswadip Gharai
  • Subin Jose
  • T Prajesh
Article
  • 56 Downloads

Abstract

An assessment of satellite-derived long-term tropospheric nitrogen dioxide (\(\hbox {NO}_{2})\) data is performed over the Indian region and their implications on the regional air quality are discussed. The Indo-Gangetic plain (IGP) shows an increasing trend in \(\hbox {NO}_{2}\) of the order of \(3\times 10^{13}\hbox { mol/cm}^{2}/\hbox {yr}\). The pixel-wise (0.25 km) trend for the period 2005–2014 reveals various regions having increased rates of pollution over the study period. Further, the mean seasonal concentrations of \(\hbox {NO}_{2}\) are segregated for different parts of the country including oceanic regions and the trends are brought out. The highest rate of increase of tropospheric \(\hbox {NO}_{2}\,(2\times 10^{14}\,\hbox {mol}/\hbox {cm}^{2}/\hbox {yr}\)) is seen around coal mining areas and certain industrial areas such as ports and thermal power stations. Using the data spanning 10 years, the wavelet analysis is carried out to study the influence of semi-annual oscillations (SAO) on trace gas concentrations in different parts of the country. The study reveals that the SAO are stronger in the northern parts of India, including IGP and western India, whereas South India and oceanic regions are having very low SAO component and strong annual oscillation component.

Keywords

Tropospheric \(\hbox {NO}_{2}\) satellite concentrations long-term trend AO SAO 

Notes

Acknowledgements

The authors gratefully acknowledge the support rendered by DD-ECSA, in carrying out this study. The authors also gratefully acknowledge the data provided by OMI satellite team through http://mirador.gsfc.nasa.gov that has enabled us to carry out this study.

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Copyright information

© Indian Academy of Sciences 2018

Authors and Affiliations

  1. 1.National Remote Sensing CentreHyderabadIndia
  2. 2.Space Physics Laboratory, VSSCTrivandrumIndia
  3. 3.U R Rao Satellite CentreBengaluruIndia

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