| Автор | Lopèz‐Valverde, M. A. |
| Автор | Lopèz‐Puertas, M. |
| Дата выпуска | 1994 |
| dc.description | A non‐local thermodynamic equilibrium (LTE) radiative transfer model has been applied to study the CO<sub>2</sub> and CO emissions in the infrared (1–20 μm) in the atmosphere of Mars during daytime conditions. An extensive set of vibrational‐translational (V‐T) and vibrational‐vibrational (V‐V) collisional exchanges among the vibrational levels responsible for these emissions has been considered. Radiative transfer has been included for most of the transitions and its importance illustrated for some of them. The populations of the most important vibrational levels of GO and of the ν<sub>2</sub> and ν<sub>3</sub> modes of CO<sub>2</sub> are presented. The CO<sub>2</sub>(0,ν<sub>2</sub>,0) levels follow LTE up to about 80 km at daytime, some 5 km lower than at nighttime conditions. The absorption of solar radiation at 1.6, 2.0, and 2.7 μm, and subsequent relaxation by V‐V and radiative processes, significantly populates these levels in the lower thermosphere, increasing all their vibrational temperatures with respect to nighttime conditions. Solar excitation and radiative transfer in 4.3 μm constitute the main sources of excitation of the (0,0°,1) level in the thermosphere, where this level shows a very large vibrational temperature. The V‐V transfer from highly excited CO<sub>2</sub> levels is even larger than the direct radiative excitation of the (0,0°,1) level in the mesosphere. The model predicts that the known inversion population between this vibrational level and the lower (0,2°,0) and (1,0°,0) levels will occur in the high mesosphere and above. The CO(1) level also shows much larger populations than during nighttime conditions, due to direct solar absorption at 4.7 μm and the role played by radiative transfer. A sensitivity study of the effect of current uncertainties in rate constants on the level populations is also presented. The uncertainties in the rate for ν<sub>3</sub> quanta exchange among CO<sub>2</sub> levels have significant effects on the deactivation of high energy states, leading to changes of importance in the daytime populations of the 2.7‐μm states in the mesosphere and in the (0,0°,1) level in the lower thermosphere. |
| Формат | application.pdf |
| Копирайт | Copyright 1994 by the American Geophysical Union. |
| Тема | ATMOSPHERIC COMPOSITION AND STRUCTURE |
| Тема | Radiation: transmission and scattering |
| Тема | Middle atmosphere: composition and chemistry |
| Тема | ATMOSPHERIC PROCESSES |
| Тема | Meteorology and Atmospheric Dynamics: Radiative processes |
| Тема | PLANETARY SCIENCES: SOLID SURFACE PLANETS |
| Тема | Planetology: Solid Surface Planets and Satellites: Atmospheric composition and chemistry |
| Название | A non‐local thermodynamic equilibrium radiative transfer model for infrared emissions in the atmosphere of Mars: 2. Daytime populations of vibrational levels |
| Тип | article |
| DOI | 10.1029/94JE01091 |
| Electronic ISSN | 2156-2202 |
| Print ISSN | 0148-0227 |
| Журнал | Journal of Geophysical Research: Planets |
| Том | 99 |
| Первая страница | 13117 |
| Последняя страница | 13132 |
| Выпуск | E6 |
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