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    • Keywords


      Tropospheric NO$_{2}$; satellite concentrations; long-term trend; AO; SAO.

    • Abstract


      An assessment of satellite-derived long-term tropospheric nitrogen dioxide (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 NO$_{2}$ of the order of 3$\times$ 10$^{13}$ mol/cm$^{2}$/ 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 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 NO$_{2}$ (2$\times$ 10$^{14}$ mol/cm$^{2}$/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.

    • Author Affiliations


      Madhav Haridas M K1 Biswadip Gharai1 Subin Jose2 Prajesh T3

      1. National Remote Sensing Centre, Hyderabad, Telangana 500 037, India.
      2. Space Physics Laboratory, VSSC, Trivandrum 695 021, India.
      3. U R Rao Satellite Centre, Bengaluru 560 017, India.
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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