Tropospheric ozone and oxides of nitrogen over the north-western Pacific in summer |
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| Authors: | Y Kondo H Muramatsu W A Matthews N Toriyama M Hirota |
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| Institution: | (1) Research Institute of Atmospherics, Nagoya University, Toyokawa, Japan;(2) Disaster Prevention Research Institute, Kyoto University, Uji, Japan;(3) Physics and Engineering Laboratory Lauder, DSIR, Lauder, Central Otago, New Zealand;(4) Tateno Aerological Observatory, JMA, Tsukuba, Japan |
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| Abstract: | In summer, atmospheric ozone was measured from an aircraft platform simultaneously with nitric oxide (NO), oxides of nitrogen (NO
y
), and water vapor over the Pacific Ocean in east Asia from 34° N to 19° N along the longitude of 138±3°E. NO
y
was measured with the aid of a ferrous sulfate converter. The altitude covered was from 0.5 to 5 km. A good correlation in the smoothed meridional distributions between ozone and NO
y
was seen. In particular, north of 25° N, ozone and NO
y
mixing ratios were considerably higher than those observed in tropical marine air south of 25° N. NO
y
and O3 reached a minimum of 50 pptv and 4 ppbv respectively in the boundary layer at a latitude of 20° N. The NO concentration between 2 and 5 km at the same latitude was 30 pptv. The profiles of ozone and water vapor mixing ratios were highly anti-correlated between 25° N and 20° N. In contrast, it was much poorer at the latitude of 33° N, suggesting a net photochemical production of ozone there. |
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| Keywords: | Ozone oxides of nitrogen H2O troposphere |
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