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The Discrete Ordinate Algorithm, DISORT for Radiative Transfer

  • Istvan LaszloEmail author
  • Knut Stamnes
  • Warren J. Wiscombe
  • Si-Chee Tsay
Chapter
Part of the Springer Praxis Books book series (PRAXIS)

Abstract

The discrete ordinate method for the transfer of monochromatic unpolarized radiation in non-isothermal, vertically inhomogeneous media, as implemented in the computer code Discrete-Ordinate-Method Radiative Transfer, DISORT, is reviewed. Both the theoretical background and its algorithmic implementation are covered. Among others, described are the reduction of the order of the standard algebraic eigenvalue problem to increase efficiency in both the homogenous and particular solutions of the system of coupled ordinary differential equations, application of the scaling transformation to make the solution unconditionally stable for arbitrary large values of optical depth, application of the δ-M method to handle highly anisotropic scattering, the correction of intensities by the Nakajima-Tanaka method, and the implementation of a realistic bidirectional bottom boundary. Numerical considerations that make the implementation robust and efficient are also discussed. Examples of setting up DISORT runs are shown by using test cases with increasing complexity. Brief summaries of the versions released to date are provided, as well.

Notes

Acknowledgments

The authors thank Z. Lin, S. Stamnes, L. Rokke, M. Zhou and H. Liu for their critical reading of and useful comments on an earlier version of the manuscript, and A. Kokhanovsky for inviting us to write this review and for his patience. IL acknowledges the assistance of K. Laszlo with typing in many of the equations.

Disclaimer

The contents of this paper are solely the opinions of the authors and do not constitute a statement of policy, decision, or position on behalf of the U.S. National Oceanic and Atmospheric Administration (NOAA) or the U.S. Government.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Istvan Laszlo
    • 1
    Email author
  • Knut Stamnes
    • 2
  • Warren J. Wiscombe
    • 3
  • Si-Chee Tsay
    • 3
  1. 1.Center for Satellite Applications and ResearchNational Oceanic and Atmospheric AdministrationCollege ParkUSA
  2. 2.Department of Physics and Engineering PhysicsStevens Institute of TechnologyHobokenUSA
  3. 3.Climate and Radiation Laboratory, Code 613NASA Goddard Space Flight CenterGreenbeltUSA

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