Aircraft measurements of oxides of nitrogen along the eastern rim of the Asian continent: Winter observations |
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Authors: | Y. Kondo W. A. Matthews A. Iwata Y. Morita M. Takagi |
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Affiliation: | 1. Research Institute of Atmospherics, Nagoya University, Toyokawa, Aichi, Japan 2. Physics and Engineering Laboratory, Atmospheric Station, Department of Scientific and Industrial Research, Lauder, Central Otago, New Zealand 3. Research Institute of Atmospherics, Nagoya University, Toyokawa, Aichi, Japan
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Abstract: | Aircraft observations of oxides of nitrogen (NO y ), measured with a ferrous sulfate converter, over the sea surrounding the Japanese islands (30–43° N, 131–141° E) were carried out in the winter of 1983 and 1984 at altitudes mostly between 3 and 8 km. NO y defined here is the sum of NO, NO2, and other unstable oxides of nitrogen that are converted to NO by ferrous sulfate. The main observations were: - Over the Pacific Ocean between the latitudes of 30–35° N, the observed NO y mixing ratio between 3 and 8 km was a fairly constant 200 pptv. The NO mixing ratio increased with altitude from 15 pptv at 3 km to 35 pptv at 7 km.
- Over the Sea of Japan, tropospheric NO y mesured between 1 and 6 km started increasing with latitude North of 35° N and reached about 1000 pptv at 40° N.
- NO y was measured in an air mass transported from the stratosphere near a tropopause fold region. When the ozone mixing ratio was between 80 and 140 ppbv, the NO y mixing ratio was about 200 pptv.
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