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Dependence of the spectral surface irradiance on aerosol properties and surface reflectivityA reduction in global surface irradiance occurs with increasing aerosol loadings when the aerosols are absorbing. For scattering aerosols, a reduction is pronounced for isotropic scattering (characteristic of small particles) but reduction is not as significant for scattering with a high anisotropy of a large forward peak (characteristic of large particles). This distinction between isotropic and anisotropic scattering becomes small or null over highly reflecting terrain; and for reflectivities higher than 0.5 and solar elevation angles close to the zenith, the global irradiance can be slightly higher for isotropic scattering than in the case of an anisotropy of a forward peak. Under such conditions, which can be encountered in reflective infrared bands over dense vegetation or over sandy deserts (close to noon, in low latitudes) the surface irradiance becomes nearly independent of the aerosol optical thickness.
Document ID
19800053133
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Otterman, J.
(NASA Goddard Institute for Space Studies, New York, N.Y.; Tel Aviv University Tel Aviv, Israel)
Kaufman, Y.
(Tel-Aviv Univ. Ramat-Aviv, Tel-Aviv, Israel)
Podolak, M.
(Tel Aviv University Tel Aviv, Israel)
Ungar, S.
(NASA Goddard Institute for Space Studies New York, N.Y., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1980
Publication Information
Publication: Solar Energy
Volume: 24
Issue: 3, 19
Subject Category
Geophysics
Accession Number
80A37303
Distribution Limits
Public
Copyright
Other

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