| Автор | Burns, A. G. |
| Автор | Killeen, T. L. |
| Автор | Roble, R. G. |
| Дата выпуска | 1989 |
| dc.description | A diagnostic postprocessor analysis package used with runs of the National Center for Atmospheric Research thermospheric general circulation model (NCAR‐TGCM) has been extended to include the terms of the neutral composition equation that is solved by this model. The purpose of the development of this capability is to quantify the relative importance of the various physical and chemical mechanisms that force changes in neutral thermospheric composition for given geophysical situations. Such mechanisms include photodissociation of molecular oxygen and three‐body recombination of atomic oxygen, molecular and eddy diffusion and vertical and horizontal wind advection. Compositional term analysis calculations are presented using a diurnally‐reproducible TGCM run for a day of moderate geomagnetic activity (K<sub>p</sub> = 3) near December solstice. Principal results for F region altitudes are in general agreement with previous work and include the following: (1) upper thermospheric composition is controlled by three major processes of vertical advection, horizontal advection and molecular diffusion; (2) the time scale for changes of 1/e in the mass mixing ratio for N<sub>2</sub> and O resulting from these processes is typically ∼25–30 hours; (3) large gradients exist in the mass mixing ratios for N<sub>2</sub> and O in the summer hemisphere high‐latitude region that, when combined with horizontal winds blowing across the magnetic pole, led to significant composition changes due to horizontal mass advection; (4) vertical advection is the major cause of the changes in mass mixing ratio of N<sub>2</sub> and O at low and middle latitudes, with cooling and subsidence leading to decreases (increases) in the mixing ratios of N<sub>2</sub> (O) at night, and heating and expansion leading to increase (decreases) during the daytime; (5) upward winds caused by Joule heating in the morning and evening sectors of the auroral oval cause large increases in the mixing ratio of N<sub>2</sub> in these regions due to vertical mass advection. The principal results at ∼120 km altitude include the following: (1) photodissociation is an important term for O and O<sub>2</sub> in this altitude region, becoming roughly commensurate with molecular diffusion, vertical and horizontal advection; (2) significant increases in the mass mixing ratio of O in the summer hemisphere occur due to photodissociation, especially in the daytime at middle latitudes; (3) downward molecular diffusion of O is important in controlling the mass mixing ratio for O, particularly in the high‐latitude winter hemisphere; (4) a complicated morphological pattern of horizontal and vertical advection maintains the mass mixing ratios at these altitudes; (5) vertical advection resulting from Joule heating in the morning and evening sectors of the auroral zone is of importance for the composition of the high‐latitude lower thermosphere; (6) typical time scales for maximum changes of 1/e in the mass mixing ratio of N<sub>2</sub> are of the order of 60–90 hours. |
| Формат | application.pdf |
| Копирайт | Copyright 1989 by the American Geophysical Union. |
| Тема | ATMOSPHERIC COMPOSITION AND STRUCTURE |
| Тема | Thermosphere: composition and chemistry |
| Тема | Ion chemistry of the atmosphere |
| Тема | IONOSPHERE |
| Тема | Ionosphere/atmosphere interactions |
| Тема | ATMOSPHERIC PROCESSES |
| Тема | Meteorology and Atmospheric Dynamics: Thermospheric dynamics |
| Название | Processes responsible for the compositional structure of the thermosphere |
| Тип | article |
| DOI | 10.1029/JA094iA04p03670 |
| Electronic ISSN | 2156-2202 |
| Print ISSN | 0148-0227 |
| Журнал | Journal of Geophysical Research: Space Physics |
| Том | 94 |
| Первая страница | 3670 |
| Последняя страница | 3686 |
| Выпуск | A4 |
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