| タイトル | CO2 on Titan |
| 著者（英） | Maguire, W. C.; Kunde, V. G.; Yung, Y. L.; Aikin, A. C.; Samuelson, R. E.; Hanel, R. A.; Jennings, D. E. |
| 著者所属（英） | NASA Goddard Space Flight Center|California Inst. of Tech. |
| 発行日 | 1983-11-01 |
| 言語 | eng |
| 内容記述 | A sharp stratospheric emission feature at 667/cm in the Voyager infrared spectra of Titan is associated with the nu2 Q branch of CO2. A coupling of photochemical and radiative-transfer theory yields an average mole fraction above the 110 mbar level of (1.5 + 1.5 or - 0.8) x 10 to the -9th, with most of the uncertainty being due to imprecise knowledge of the vertical distribution. CO2 is found to be in a steady state, with its abundance being regulated principally by the 72 K cold trap near the tropopause and secondarily by the rate at which water-bearing meteoritic material enters the top of the atmosphere. An influx of water about 0.4 times that at the top of the terrestrial atmosphere is consistent with a combination of the observed CO2 abundance and a steady-state CO mole fraction of 0.00011; the thoeretical value for CO is close to the value observed by Lutz et al. (1983), although there are large margins for error in both numbers. If steady-state conditions for CO prevail, little information is available regarding the evolution of Titan's atmosphere. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 84A12857 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/400789 |
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