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RISReassessing the Elliptic Phase Function for Use in Two-Stream Approximations
Publisher: American Meteorological Society
Abstract: In an important paper written over 25 years ago, solar radiative fluxes based on exact Mie phase functions were compared to fluxes for corresponding elliptic and Henyey?Greenstein scattering phase functions. The poor ...
Solar Radiative Transfer for Wind-Sheared Cumulus Cloud Fields
Publisher: American Meteorological Society
Abstract: The Monte Carlo method of photon transport was used to simulate solar radiative transfer for cumulus-like cloud forms (and cloud fields) possessing structural characteristics similar to those induced by wind shear. Using ...
Estimating Cloud Field Albedo Using One-Dimensional Series Of Optical Depth
Publisher: American Meteorological Society
Abstract: This study examines the ability to estimate regional cloud albedo using 1D series of cloud optical depth τ similar to those inferred from ground-based microwave radiometers. The investigation has two facets: use of appropriate ...
A Parameterization for Computing Grid-Averaged Solar Fluxes for Inhomogeneous Marine Boundary Layer Clouds. Part I: Methodology and Homogeneous Biases
Publisher: American Meteorological Society
Abstract: A method of computing grid-averaged solar radiative fluxes for horizontally inhomogeneous marine boundary layer cloud fields is presented. Its underlying assumptions are as follows: i) the independent pixel approximation ...
Indirect Aerosol Forcing by Homogeneous and Inhomogeneous Clouds
Publisher: American Meteorological Society
Abstract: It has been hypothesized that over the past ?200 years, industrial activity has enhanced the number of cloud condensation nuclei (CCN) in the lower atmosphere thereby reducing cloud droplet effective radii re and increasing ...
Inferring Optical Depth of Broken Clouds above Green Vegetation Using Surface Solar Radiometric Measurements
Publisher: American Meteorological Society
Abstract: A method for inferring cloud optical depth τ is introduced and assessed using simulated surface radiometric measurements produced by a Monte Carlo algorithm acting on fields of broken, single-layer, boundary layer clouds ...
Assessment and Optimization of the Gamma-Weighted Two-Stream Approximation
Publisher: American Meteorological Society
Abstract: The two primary foci of this note are to assess the ability of the multilayer gamma-weighted two-stream approximation (GWTSA) to compute domain-averaged solar radiative fluxes and to demonstrate how its execution time can ...
Improved Simulation of Clear-Sky Shortwave Radiative Transfer in the CCC-GCM
Publisher: American Meteorological Society
Abstract: The disposition of mean July clear-sky solar radiation in the Canadian Climate Centre second-generation general circulation model (CCC-GCMII) was analyzed by comparing top of the atmosphere (TOA) net fluxes with earth ...
Inferring Optical Depth of Broken Clouds from Landsat Data
Publisher: American Meteorological Society
Abstract: Optical depths τpp for broken, shallow clouds over ocean were inferred from Landsat cloud reflectances Rcld (0.83 ?m) with horizontal resolution of 28.5 m. The values τpp were obtained by applying an inverse, homogeneous, ...
Surface Albedo Estimates from Nimbus-7 ERB Data and a Two-Stream Approximation of the Radiative Transfer Equation
Publisher: American Meteorological Society
Abstract: Solar zenith angle-dependent surface albedo is determined by equating top of the atmosphere (TOA) albedo evaluated from Nimbus-7 data with TOA albedo predicted by a two-layer, two-stream radiative transfer model of the ...