![Gravito-photophoresis and aerosol stratification in the atmosphere [An article from: Journal of Aerosol Science]](https://www.ebooknetworking.net/books/B00/0RR/bigB000RR79R8.jpg)
Gravito-photophoresis and aerosol stratification in the atmosphere [An article from: Journal of Aerosol Science]
Book Details
PublisherElsevier
ISBN / ASINB000RR79R8
ISBN-13978B000RR79R2
AvailabilityAvailable for download now
MarketplaceUnited States 🇺🇸
Description
This digital document is a journal article from Journal of Aerosol Science, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
The formation of aerosol layers in the earth's stratosphere and mesosphere under the influence of gravito-photophoretic forces is considered. The minimum set of effective particle parameters for describing gravito-photophoretic forces, and their critical values for vertical transport and levitation of particles are discussed. The behaviour of two types of particles are investigated specifically: (1) soot-like particles strongly absorbing both solar (visible) and IR radiation, and (2) sulfate-like particles which are transparent in the visible, but strongly absorb the terrestrial IR radiation. Only particles larger than one micrometer can levitate under the influence of gravito-photophoresis. Particles larger than 1@mm can be suspended in the atmosphere. They need to have a variation in accommodation coefficient over the surface. As a rule transparent particles should have a density smaller than the one of water. Both black particles and white particles can be levitated. Gravito-photophoresis explains the existence of narrow aerosol layers at altitudes of approximately 20 and 50km, and also at approx. 70 and 80-83km. The thickness of the layers can be less than 1km if the accomodation coefficient exhibits only small differences over the surface. Transparent particles may form thick layers above 50km rather easily.
Description:
The formation of aerosol layers in the earth's stratosphere and mesosphere under the influence of gravito-photophoretic forces is considered. The minimum set of effective particle parameters for describing gravito-photophoretic forces, and their critical values for vertical transport and levitation of particles are discussed. The behaviour of two types of particles are investigated specifically: (1) soot-like particles strongly absorbing both solar (visible) and IR radiation, and (2) sulfate-like particles which are transparent in the visible, but strongly absorb the terrestrial IR radiation. Only particles larger than one micrometer can levitate under the influence of gravito-photophoresis. Particles larger than 1@mm can be suspended in the atmosphere. They need to have a variation in accommodation coefficient over the surface. As a rule transparent particles should have a density smaller than the one of water. Both black particles and white particles can be levitated. Gravito-photophoresis explains the existence of narrow aerosol layers at altitudes of approximately 20 and 50km, and also at approx. 70 and 80-83km. The thickness of the layers can be less than 1km if the accomodation coefficient exhibits only small differences over the surface. Transparent particles may form thick layers above 50km rather easily.
