Influence of Single Scattering Albedo on Reflected and Transmitted Light from Clouds PDF Download
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Author: Plass, Gilbert N. Publisher: ISBN: Category : Light Languages : en Pages : 72
Book Description
The dependence of the reflected and transmitted light from clouds on the single scattering albedo wo is studied. The multiply scattered path of the photon in the cloud is accurately simulated by Monte Carlo techniques. When the cloud is thin and the surface albedo A = 0, the reflected and transmitted radiances vary nearly as wo for fixed angles of incidence and observation and they depend strongly on the value of A. As wo becomes small and for thick clouds, the reflected radiance approaches more closely the value calculated from the single scattering phase function. As the absorption increases the transmitted radiance at the zenith becomes larger relative to the value near the horizon. Also as the optical thickness increases, the maximum of the transmitted radiance moves from the incident direction toward the zenith. The variations in the flux and the mean optical path are also discussed. (Author).
Author: Plass, Gilbert N. Publisher: ISBN: Category : Light Languages : en Pages : 72
Book Description
The dependence of the reflected and transmitted light from clouds on the single scattering albedo wo is studied. The multiply scattered path of the photon in the cloud is accurately simulated by Monte Carlo techniques. When the cloud is thin and the surface albedo A = 0, the reflected and transmitted radiances vary nearly as wo for fixed angles of incidence and observation and they depend strongly on the value of A. As wo becomes small and for thick clouds, the reflected radiance approaches more closely the value calculated from the single scattering phase function. As the absorption increases the transmitted radiance at the zenith becomes larger relative to the value near the horizon. Also as the optical thickness increases, the maximum of the transmitted radiance moves from the incident direction toward the zenith. The variations in the flux and the mean optical path are also discussed. (Author).
Author: Plass, Gilbert N. Publisher: ISBN: Category : Light Languages : en Pages : 156
Book Description
The scattering of visible light by clouds is calculated from an efficient Monte Carlo code which follows the multiply scattered path of the photon. The single scattering phase function is obtained from the Mie theory by integration over a particle size distribution. The photons are followed through a sufficient number of collisions and reflections from the lower surface (which may have any desired albedo) until they make a negligible contribution to the intensity. Various variance reduction techniques were used to improve the statistics. The reflected and transmitted intensity is studied as a function of solar zenith angle, optical thickness, and surface albedo. The downward flux, cloud albedo, and mean optical path of the transmitted and reflected photons are given as a function of these same parameters. The numerous small angle scatterings of the photon in the direction of the incident beam are followed accurately and produce a greater penetration into the cloud than is obtained with a more isotropic and less realistic phase function. (Author).
Author: George W. Kattawar Publisher: ISBN: Category : Languages : en Pages : 44
Book Description
The light reflected and transmitted from clouds with various drop size distributions is calculated by a Monte Carlo technique. Six different models are used for the drop size distribution: isotropic; Rayleigh; haze continental; haze maritime; cumulus; nimbostratus. The scattering function for each model is calculated from the Mie theory. In general the reflected and transmitted radiance for the isotropic and Rayleigh models tend to be similar as are those for the various haze and cloud models. The reflected radiance is less for the haze and cloud models than for the isotropic and Rayleigh models, except for an angle of incidence near the horizon when it is larger around the incident beam direction. The transmitted radiance is always much larger for the haze and cloud models near the incident direction; at distant angles it is less for small and moderate optical thicknesses and greater for large optical thicknesses (all comparisons to isotropic and Rayleigh models). The downward flux, cloud albedo, and mean optical path are discussed. The angular spread of the beam as a function of optical thickness is shown for the nimbostratus model. (Author).
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 1126
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: Plass, Gilbert N.
Author: Plass, Gilbert N.
Author: Plass, Gilbert N.
Author: George W. Kattawar
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Author: U.S. Air Force Geophysics Laboratory
Author: Defense Documentation Center (U.S.)
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