Seasonal and diurnal behavior of NO2 column density in Antarctica as observed by Mark IV,Brewer Ozone Spectrophotometer Number 153 |
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Authors: | D.K. Chakrabarty S.K. Peshin |
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Affiliation: | 1. Physical Research Laboratory, Ahmedabad 380009, India;2. India Meteorology Department, Lodi Road, New Delhi 110003, India |
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Abstract: | The Meteorology Department of India has been measuring vertical column density of NO2 at Maitri (70.7°S, 11.7°E), Antarctica since July 1999 using a Mark IV, Brewer Ozone Spectrophotometer. Maitri is situated at the south of the Antarctic circle. An analysis of 6 years of data shows that NO2 column has seasonal variation with a maximum value during summer. It is also found that during the period when sun does not set, the NO2 column exhibits a diurnal variation, with a peak around noon and lower values in the morning and afternoon hours. Using a simple steady-state chemical reaction scheme, an attempt has been made to explain these features. |
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Keywords: | NO2 NO UV-B Antarctica |
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