Development and Evaluation of a Shortwave Full-Spectrum Correlated K-Distribution Radiative Transfer Algorithm for Numerical Weather Prediction

Abstract

The Full Spectrum Correlated k-distribution (FSCK) method, originally developed for applications in combustion systems, is adapted for use in shortwave atmospheric radiative transfer. By weighting k-distributions by the solar source function, the FSCK method eliminates the requirement that the Planck function be constant over a spectral interval. Consequently, integration may be carried out across the full spectrum as long as the assumption of correlation from one atmospheric level to the next remains valid. Errors resulting from the lack of correlation across the full spectrum are removed by partitioning the spectrum at a wavelength of 0.68 m into two bands. The resulting two-band approach in the FSCK formalism requires only 15 quadrature points per atmospheric layer. This represents a 40 90% reduction in computation time relative to existing correlated k-distribution models.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 2004
Accession Number
ADA430195

Entities

People

  • Daniel T. Pawlak

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Air Force
  • Algorithms
  • Carbon Monoxide
  • Climate Change
  • Computational Science
  • Dielectric Gases
  • Meteorology
  • Optical Properties
  • Radiative Transfer
  • Scattering
  • Solar Energy
  • Solar Radiation
  • Spectra
  • Three Dimensional
  • Two Dimensional
  • Weather Forecasting

Readers

  • Calculus or Mathematical Analysis
  • Computational Modeling and Simulation
  • Spectroscopy.