• Long-term ozone decline and its effect on night airglow intensity of Li 6708 ˚A at Varanasi (25°N, 83°E) and Halley Bay (76°S, 27°W)

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    • Keywords


      Ozone depletion; airglow emission; excitation mechanism; intensity.

    • Abstract


      A critical analysis has been made on the long-term yearly and seasonal variations of ozone concentration at Varanasi (25°N, 83°E), India and Halley Bay (76°S, 27°W), a British Antarctic Service Station. The effect of O3 depletion on night airglow emission of Li 6708 ˚A line at Varanasi and Halley Bay has been studied. Calculations based on chemical kinetics show that the airglow intensity of Li 6708 ˚A line has also been affected due to the depletion of O3 concentration. The yearly variations and seasonal variations of intensities of Li 6708 ˚A line for the above two stations are shown and compared. It has been shown that the rate of decrease of intensity of Li 6708 ˚A line was comparatively more at Halley Bay due to dramatic decrease of Antarctic O3 concentration.

    • Author Affiliations


      P K Jana1 I Saha2 S Mukhopadhyay3

      1. Department of Chemistry, Government College of Education, Banipur, North-24 Parganas 743 233, India.
      2. Department of Chemistry, Metia High School (H.S.), Matia, Basirhat, North-24 Parganas 743 437, India.
      3. Department of Chemistry, Jadavpur University, Kolkata 700 032, India.
    • Dates

  • Journal of Earth System Science | News

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      Posted on July 25, 2019

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