Improvements in modeling the microphysical and radiative properties of cirrus clouds using the Regional Atmospheric Modeling System (RAMS). Final report

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Description

The main work activity during this period was the refinement and GCM parameterization of the treatment of ice cloud radiative properties, developed for this project. The treatment has now been rigorously tested and improved, and can now be used with confidence in radiation transfer schemes. The ice Cloud radiation scheme has also proven useful in satellite remote sensing. The radiation scheme differs from others in the thermal infrared, where it is assumed that photon tunneling does not occur for real ice particles (tunneling can be viewed as a process by which photons outside a particle`s area-cross section can still be ... continued below

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7 p.

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Mitchell, D.L.; Koracin, D. & Edwards, J.M. August 1, 1998.

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  • Mitchell, D.L.
  • Koracin, D. Univ. of Nevada System, Reno, NV (United States). Desert Research Inst.
  • Edwards, J.M. United Kingdom Meteorological Office, Bracknell (United Kingdom). Hadley Centre for Climate Prediction and Research

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Description

The main work activity during this period was the refinement and GCM parameterization of the treatment of ice cloud radiative properties, developed for this project. The treatment has now been rigorously tested and improved, and can now be used with confidence in radiation transfer schemes. The ice Cloud radiation scheme has also proven useful in satellite remote sensing. The radiation scheme differs from others in the thermal infrared, where it is assumed that photon tunneling does not occur for real ice particles (tunneling can be viewed as a process by which photons outside a particle`s area-cross section can still be absorbed). Single particle T-matrix and Mie calculations suggest that a particle`s ability to capture energy through tunneling depends on surface morphology, with more tunneling the more circular (or less angular) a surface is. This assumption leads to retrievals of mean particle size which are similar to those observed in tropical cirrus by optical imaging probes, whereas retrieved sizes using Mie theory are about 1/3 those predicted by this scheme. The retrieval method requires channels in the 8--9 {micro}m and 11--12 {micro}m ranges. This assumption about tunneling, as well as treating size distributions in the radiation scheme as bimodal, allows retrievals over a broader range of mean particle size than previous schemes permitted, making such size retrievals applicable to most types of cirrus clouds.

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7 p.

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OSTI as DE98006116

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  • Other Information: PBD: [1998]

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  • Other: DE98006116
  • Report No.: DOE/ER/61775--T1
  • Grant Number: FG03-94ER61775
  • DOI: 10.2172/656468 | External Link
  • Office of Scientific & Technical Information Report Number: 656468
  • Archival Resource Key: ark:/67531/metadc702167

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  • August 1, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 6, 2015, 3:07 p.m.

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Mitchell, D.L.; Koracin, D. & Edwards, J.M. Improvements in modeling the microphysical and radiative properties of cirrus clouds using the Regional Atmospheric Modeling System (RAMS). Final report, report, August 1, 1998; United States. (digital.library.unt.edu/ark:/67531/metadc702167/: accessed September 24, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.