| タイトル | In situ measurement of water vapor in the stratosphere with a cryogenically cooled Lyman-alpha hygrometer |
| 著者（英） | Nee, J. B.; Weinstock, E. M.; Schwab, J. J.; Anderson, J. G. |
| 著者所属（英） | Harvard Univ.|State Univ. of New York |
| 発行日 | 1990-08-20 |
| 言語 | eng |
| 内容記述 | In situ measurements of water vapor in the stratosphere with a new instrument are reported. The instrument has been designed to observe daytime water vapor from a multiinstrument balloon gondola that simultaneously measures free radicals such as OH, HO2, and O3 in the stratosphere up to 40 km. Lyman-alpha photofragment fluorescence is used to measure water molecules in a flowing sample of ambient air. A brief description of the instrument is given, followed by the results of the first four balloon flights. The measured mixing ratio for this flight varies from 3.0-5.5 ppmv over the altitude range of 17-34 km. Adjustments in the cooling protocol for the flights of July 6, 1988, July 28, and August 25, 1989, result in a much higher signal-to-noise ratio. Profiles from these three flights are similar to, but somewhat higher, than the 1987 profile. Implications of measurements are discussed, as are the issues of short- and long-term variability of stratospheric water vapor. |
| NASA分類 | METEOROLOGY AND CLIMATOLOGY |
| レポートNO | 90A47039 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/354299 |
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