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Interpolation of LES cloud surfaces for use in direct calculations of entrainment and detrainment

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dc.contributor.author Dawe, Jordan T.
dc.contributor.author Austin, Philip H.
dc.date.accessioned 2011-03-25T18:23:18Z
dc.date.available 2011-03-25T18:23:18Z
dc.date.issued 2011-02-01
dc.identifier.citation Dawe, Jordan T., Austin, Philip H. 2011. Interpolation of LES Cloud Surfaces for Use in Direct Calculations of Entrainment and Detrainment. Monthly Weather Review, 139(2) 444–456. dx.doi.org/10.1175/2010MWR3473.1 en
dc.identifier.uri http://hdl.handle.net/2429/32934
dc.description.abstract Direct calculations of the entrainment and detrainment of air into and out of clouds require knowledge of the relative velocity difference between the air and the cloud surface. However, a discrete numerical model grid forces the distance moved by a cloud surface over a time step to be either zero or the width of a model grid cell. Here a method for the subgrid interpolation of a cloud surface on a discrete numerical model grid is presented. This method is used to calculate entrainment and detrainment rates for a large-eddy simulation (LES) model, which are compared with rates calculated via the direct flux method of Romps. The comparison shows good agreement between the two methods as long as the model clouds are well resolved by the model grid spacing. This limitation of this technique is offset by the ability to resolve fluxes on much finer temporal and spatial scales, making it suitable for calculating entrainment and detrainment profiles for individual clouds. Copyright 2011 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act or that satisfies the conditions specified in Section 108 of the U.S. Copyright Act (17 USC §108, as revised by P.L. 94-553) does not require the AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a web site or in a searchable database, or other uses of this material, except as exempted by the above statement, requires written permission or a license from the AMS. Additional details are provided in the AMS Copyright Policy, available on the AMS Web site located at (http://www.ametsoc.org/) or from the AMS at 617-227-2425 or copyright@ametsoc.org. en
dc.language.iso eng en
dc.publisher American Meteorological Society en
dc.title Interpolation of LES cloud surfaces for use in direct calculations of entrainment and detrainment en
dc.type text en
dc.type.text article en
dc.description.affiliation Earth and Ocean Sciences, Dept. of (EOS), Dept of en
dc.description.reviewstatus Reviewed en
dc.rights.copyright Austin, Philip H. en
dc.description.scholarlevel Faculty en

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