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Record 1 of 58525
Enhancement of atmospheric radiation by an aerosol layer
Author and Affiliation:
Michelangeli, Diane V.(California Inst. of Tech., Pasadena, CA, United States)
Yung, Yuk L.(California Inst. of Tech., Pasadena, CA, United States)
Shia, Run-Lie(California Inst. of Tech., Pasadena, CA, United States)
Eluszkiewicz, Janusz(California Institute of Technology, Pasadena, United States)
Allen, Mark(California Inst. of Tech., Pasadena, CA, United States)
Crisp, David(JPL, California Institute of Technology)
Abstract: The presence of a stratospheric haze layer may produce increases in both the actinic flux and the irradiance below this layer. Such haze layers result from the injection of aerosol-forming material into the stratosphere by volcanic eruptions. Simple heuristic arguments show that the increase in flux below the haze layer, relative to a clear sky case, is a consequence of 'photon trapping'. The magnitude of these flux perturbations, as a function of aerosol properties and illumination conditions, is explored with a new radiative transfer model that can accurately compute fluxes in an inhomogeneous atmosphere with nonconservative scatterers having arbitrary phase function. One calculated consequence of the El Chichon volcanic eruption is an increase in the midday surface actinic flux at 20 deg N latitude, summer, by as much as 45 percent at 2900 A. This increase in flux in the UV-B wavelength range was caused entirely by aerosol scattering, without any reduction in the overhead ozone column.
Publication Date: Jan 20, 1992
Document ID:
(Acquired Nov 22, 1995)
Accession Number: 92A22019
Subject Category: GEOPHYSICS
Document Type: Journal Article
Publication Information: Journal of Geophysical Research (ISSN 0148-0227); 97; 865-874
Publisher Information: United States
Financial Sponsor: NASA; United States
Organization Source: California Inst. of Tech.; Pasadena, CA, United States
Jet Propulsion Lab., California Inst. of Tech.; Pasadena, CA, United States
Description: 10p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
Imprint And Other Notes: Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Jan. 20, 1992, p. 865-874. Research supported by EPA.
Miscellaneous Notes: Research supported by EPA
Availability Source: Other Sources
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