Transport and photochemical effects seen in stratospheric NO2 amounts |
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| Institution: | 1. Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA, USA;2. Deparment of Physics, Old Dominion University, Norfolk, VA, USA;3. Department of Chemistry, University of Waterloo, Waterloo, ON, Canada;1. Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529, USA;2. Department of Chemistry, University of Waterloo, Waterloo, ON N2L3G1, Canada;3. Department of Physics, Old Dominion University, Norfolk, VA 23529, USA;1. Department of Chemistry, University of Waterloo, 200 University Avenue West, Ontario N2L 3G1, Canada.;2. Department of Chemistry and Biochemistry, Old Dominion University, Norfolk, VA 23529, United States of America |
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| Abstract: | Column contents amounts of NO2 were measured from our sites at 45°S, 53°S and 78°S using long path differential absorption spectroscopy. In spring, the two mid-latitude sites exhibit essentially the same smooth winter to summer transition. While this trend is also present in the Antarctic data, large amplitude oscillations with a period of approximately 9 days are superimposed on this trend. These oscillations are explained in terms of transport of mid-stratospheric air from more poleward or more equatorial latitudes.The observed night-time decay of NO2 is shown to agree with a simple N2O5 chemical conversion scheme. |
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