Implementation of a Rayleigh scattering optical depth parameterization

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A new procedure for calculating Rayleigh scattering cross sections and optical depths has been developed for use in the solar radiation transfer model of the LLNL Chemistry-Radiation-Transport Models. This procedure replaces the previous method for determining the optical depths in which the parameterization of Hansen and Travis (1974) was used to generate a table of optical depths for wavelengths ranging from 0.135 {mu}m to 0.729 {mu}m; the table was then placed directly in the shortwave package. Hansen and Travis calculate Rayleigh scattering optical depths, {tau}, using {tau} = 0.08569{lambda}{sup {minus}4} (1 + 0.0113{lambda}{sup {minus}2} + 0.00013{lambda}{sup {minus}4}) where {lambda} is ... continued below

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4 p.

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Kemball-Cook, S.R. & Grant, K.E. October 1, 1994.

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Description

A new procedure for calculating Rayleigh scattering cross sections and optical depths has been developed for use in the solar radiation transfer model of the LLNL Chemistry-Radiation-Transport Models. This procedure replaces the previous method for determining the optical depths in which the parameterization of Hansen and Travis (1974) was used to generate a table of optical depths for wavelengths ranging from 0.135 {mu}m to 0.729 {mu}m; the table was then placed directly in the shortwave package. Hansen and Travis calculate Rayleigh scattering optical depths, {tau}, using {tau} = 0.08569{lambda}{sup {minus}4} (1 + 0.0113{lambda}{sup {minus}2} + 0.00013{lambda}{sup {minus}4}) where {lambda} is wavelength in {mu}m and the standard surface pressure is 1013 mB. The new scheme uses instead the parameterization of Nicolet (1984) to find the Rayleigh scattering cross sections for an arbitrary set of wavelength bins, and from these cross sections, determines the optical depths. The Nicolet parameterization was recommended by the WMO (1986), and calculates Rayleigh scattering cross sections using O{sub RS} = 4.02 {times} 10{sup {minus}28}/{lambda}{sup {minus}}(4 + x) where x=0.389{lambda} + 0.09426/{lambda}-0.3328 for {lambda} < 0.55 {mu}m and x=0.04 for {lambda} > 0.55 {mu}m.

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4 p.

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OSTI as DE95013261

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  • Other Information: PBD: Oct 1994

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  • Other: DE95013261
  • Report No.: UCRL-ID--119127
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/78735 | External Link
  • Office of Scientific & Technical Information Report Number: 78735
  • Archival Resource Key: ark:/67531/metadc716774

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  • October 1, 1994

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  • Sept. 29, 2015, 5:31 a.m.

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  • June 23, 2016, 5:48 p.m.

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Kemball-Cook, S.R. & Grant, K.E. Implementation of a Rayleigh scattering optical depth parameterization, report, October 1, 1994; California. (digital.library.unt.edu/ark:/67531/metadc716774/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.