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IJRSP Vol.35(6) [December 2006] >


Title: Depletion of ozone and its effect on night airglow intensity of Na 5893 Å at Srinagar and Halley Bay
Authors: Jana, P K
Nandi, S C
Sarkar, D
Keywords: Ozone depletion
Airglow emissions
Excitation mechanism
Intensity
Issue Date: Dec-2006
Publisher: CSIR
Abstract:  The paper presents the effect of O3 depletion on night airglow emission of Na 5893 Å line at Srinagar (34oN, 74.8oE), India and Halley Bay (76oS, 27oW), a British Antarctic survey station. Calculations based on chemical kinetics reveal that the airglow intensity of Na 5893 Å line is also affected due to ozone decline. The nature of yearly and seasonal variation of intensity of Na 5893 Å line for the above two stations are shown and compared. It is shown that the rate of decrease of yearly intensity of Na 5893 Å line is comparatively more at Halley Bay due to dramatic decrease of Antarctic O3 concentration. During Antarctic spring time, stratospheric ozone is depleted dramatically at Antarctic region because of very low temperature (–80°C), elevated concentration of atomic chlorine and chlorine oxides, low abundances of nitrogen oxides and large appearance of polar stratospheric clouds (PSCs).
Page(s): 401-406
ISSN: 0367-8393
Source:IJRSP Vol.35(6) [December 2006]

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