Тип публикации: доклад, тезисы доклада, статья из сборника материалов конференций
Конференция: Joint International Symposium on Atmospheric and Ocean Optics/Atmospheric Physics; TOMSK, RUSSIA; TOMSK, RUSSIA
Год издания: 2003
Идентификатор DOI: 10.1117/12.497278
Ключевые слова: photophoretic forces; atmospheric aerosol; bispherical particles; stratification; vertical transport
Аннотация: The gravito-photophoretic forces in the free-molecular regime have been calculated for the bispherical aerosol particles by using the Monte-Carlo method to estimate molecular transfer. It is shown that two types of gravito-photophoresis can contribute to levitation of aerosol particles absorbing the Sun and the Earth's radiation. TПоказать полностьюhere are the well-known Deltaalpha-gravito-photophoresis, its cause is a difference in the thermal accommodation coefficient, and DeltaAT-gravito-photophoresis, when the aerosol aggregate consists of individual particles differing in temperature due to a difference in the physical properties and the radiation absorption power. Both mechanisms can induce large lifting forces able to provide a vertical transport of aerosol particles into the upper atmosphere. A connection between an existence of aerosol layers at altitudes near 20, 50, 70-100 km in the real Earth's atmosphere and a condition of the balance of photophoretic and gravity forces is shown.
Журнал: NINTH JOINT INTERNATIONAL SYMPOSIUM ON ATMOSPHERIC AND OCEAN OPTICS/ATMOSPHERIC PHYSICS, PT II: LASER SENSING AND ATMOSPHERIC PHYSICS
Выпуск журнала: Vol. 5027
Номера страниц: 21-32
ISSN журнала: 0277786X
Место издания: BELLINGHAM
Издатель: SPIE-INT SOC OPTICAL ENGINEERING