| Автор | Coletti, A. |
| Автор | Hofmann, D. J. |
| Автор | Rosen, J. M. |
| Дата выпуска | 1986 |
| dc.description | Perturbations to the visible radiation by the El Chichón aerosol layers in the stratosphere have been observed using in situ time‐lapse photography of the earth horizon from a balloon gondola. The measurements were performed on May 18, 1982, from Laredo, Texas (27.3°N, 99.5°W), during a sounding performed with optical particle counters that measured aerosol size distributions in six different size ranges. The results of the microdensitometry of the photographic film agree well with the corresponding quantities determined from the optical counter data by applying Mie theory for spherical particles. The optical thickness of the stratosphere from a height of about 18.8 km to the top of the atmosphere, averaged over visible wavelengths, was found to be on the order of 0.18. At a height close to the maximum reached by the balloon (27 km) the residual optical thickness due to aerosol particles was found to be on the order of 0.7 × 10<sup>−3</sup>. The isodensity contours in the stratosphere described the main pattern of the intensity distributions of multiply scattered sunlight in the vicinity of the earth horizon. This pattern, observed at relatively high solar elevation, indicated that both the upward and downward intensities, besides depending on the particle characteristics and on their vertical distribution, also depend on variations of the general distribution in the underlying cloud coverage. |
| Формат | application.pdf |
| Копирайт | Copyright 1986 by the American Geophysical Union. |
| Тема | ATMOSPHERIC COMPOSITION AND STRUCTURE |
| Тема | Radiation: transmission and scattering |
| Тема | Volcanic effects |
| Тема | ATMOSPHERIC PROCESSES |
| Тема | Meteorology and Atmospheric Dynamics: Radiative processes |
| Тема | VOLCANOLOGY |
| Тема | Atmospheric effects |
| Название | A comparison between high‐altitude horizon photography and direct sampling of El Chichón cloud particles |
| Тип | article |
| DOI | 10.1029/JD091iD03p04073 |
| Electronic ISSN | 2156-2202 |
| Print ISSN | 0148-0227 |
| Журнал | Journal of Geophysical Research: Atmospheres |
| Том | 91 |
| Первая страница | 4073 |
| Последняя страница | 4082 |
| Выпуск | D3 |
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