| Project/Area Number |
03452062
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
気象・海洋・陸水学
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| Research Institution | Nagoya University |
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Principal Investigator |
KONDO Yutaka Nagoya Univ. Solar Terr. Env. Lab.,Professor, 太陽地球環境研究所, 教授 (20110752)
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| Co-Investigator(Kenkyū-buntansha) |
IWATA Akira Nagoya Univ.Faculty of Engin.,Res.Assoc., 情報処理教育センター, 助手 (40023676)
KOIKE Makoto Nagoya Univ.Solar Terr.Env.Lab.,Res.Assoc., 太陽地球環境研究所, 助手 (00225343)
IWASAKA Yasunobu Nagoya Univ.Solar Terr.Env.Lab.,Professor, 太陽地球環境研究所, 教授 (20022709)
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| Project Period (FY) |
1991 – 1992
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| Project Status |
Completed (Fiscal Year 1992)
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| Budget Amount *help |
¥4,000,000 (Direct Cost: ¥4,000,000)
Fiscal Year 1992: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1991: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Reactive nitrogen / Gold converter / Chemiluminescence / CO / Nitric oxide / Water vapor / Ozone / Troposphere / NO_y / 窒素酸化物 / 金コンバ-タ- |
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| Research Abstract |
NO_y is measured by converting it to NO catalytically on the surface of a heated gold tube under the addition of CO. Subsequently this NO is detected with an NO detector as described above.
To determine the zero level of NO and NO_y instruments purified gas that doesn't contain NO or NO_y is directed into the reaction chamber instead of the ambient air. It was shown that purified air fulfills therequirements for stable and low zero signal better than purified oxygen and nitrogen.
One important criterion for the performance of the NO_y instrument is it's capability to convert reactive nitrogen on the heated gold tube into NO. For the interpretation of the data obtained during a balloonflight in Northern Sweden in January 92 it was crucial to know to which degree NO_y was converted into NO. Measurements in the laboratory have shown that the conversion efficiency was close to 100%.
Extensive measurements in the laboratory have been carried out to study the possible influence of condenced water in the sample air. In the free troposphere the temperatures are usually far below 0ﾟC. These low temperatures cause a cooling of the inlet line of the NO_y instrument. The descending aircraft encountered more humid air in the lower troposphere and boundary layer, which then whould condense on the cooled sample line. Considering this effect modifications of the NO_y instrument were made to prevent this interference in future field measurements.
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