Interdiscipinary Graduate School of Science and Engineering, Tokyo Institute of Technology : Japan Science and TechnologyCorporation
Interdiscipinary Graduate School of Science and Engineering, Tokyo Institute of Technology : Japan Science and TechnologyCorporation
Interdiscipinary Graduate School of Science and Engineering, Tokyo Institute of Technology
Graduate School of Science, Tohoku University
Graduate School of Science, Tohoku University
Miyagi University of Education
Institute of Space and Astronautical Science (ISAS)
The distribution of isotopomers of nitrous oxide （＾14N＾15N＾16O，＾15N＾１4N＾16O， and ＾14N＾14N＾18O） in the lower and middle stratosphere was observed over Sanriku, Japan (39 deg N，142 deg E ） using a balloon-borne cryogenic sampler and ground-based mass spectrometry. The abundance of the heavier iso-topomers relative to ＾14N＾14N＾16O increased with altitude and remarkable site preference of nitrogen isotopomers, and difference between enrichment of ＾14N＾15N＾16O and ＾15N＾１4N＾16O, were observed. This enrichment was generally expected from the previously reported simulation experiments of photolysis and theoretical calculations based on photo-induced isotopic fractionation effects. The detailed analyses of the vertical profiles showed several differences between the observations and the photolytic simulations / calculations. This suggests that the isotopomer data of stratospheric N_2O has a potential to clarify the origin, age, and transportation or mixing of air mass, the solar flux spectrum profiles in the stratosphere, and other sink processes such as a reaction with excited oxygen atom, O（＾1D）.
三陸上空の成層圏におけるN2Oアイソトポマーの高度分布
SA0200064.pdf
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