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dc.contributor.authorMechem, David B.
dc.contributor.authorKogan, Yefim L.
dc.contributor.authorOvtchinnikov, Mikhail
dc.contributor.authorDavis, Anthony B.
dc.contributor.authorEvans, K. Franklin
dc.contributor.authorEllingson, Robert G.
dc.date.accessioned2014-11-25T17:53:01Z
dc.date.available2014-11-25T17:53:01Z
dc.date.issued2008-12-01
dc.identifier.citationMechem, David B. et al. (2008). "Multidimensional Longwave Forcing of Boundary Layer Cloud Systems." J. Atmos. Sci., 65(12):3963-3977. http://www.dx.doi.org/10.1175/2008JAS2733.1.en_US
dc.identifier.issn0022-4928
dc.identifier.urihttp://hdl.handle.net/1808/15865
dc.descriptionThis is the publisher's version, also available electronically from http://journals.ametsoc.org/doi/abs/10.1175/2008JAS2733.1.en_US
dc.description.abstractThe importance of multidimensional (MD) longwave radiative effects on cloud dynamics is evaluated in an eddy-resolving model (ERM)—the two-dimensional analog to large-eddy simulation (LES)—framework employing multidimensional radiative transfer [Spherical Harmonics Discrete Ordinate Method (SHDOM)]. Simulations are performed for a case of unbroken, marine boundary layer stratocumulus and a broken field of trade cumulus. “Snapshot” calculations of MD and independent pixel approximation (IPA; 1D) radiative transfer applied to simulated cloud fields show that the total radiative forcing changes only slightly, although the MD effects significantly modify the spatial structure of the radiative forcing. Simulations of each cloud type employing MD and IPA radiative transfer, however, differ little. For the solid cloud case, relative to using IPA, the MD simulation exhibits a slight reduction in entrainment rate and boundary layer total kinetic energy (TKE) relative to the IPA simulation. This reduction is consistent with both the slight decrease in net radiative forcing and a negative correlation between local vertical velocity and radiative forcing, which implies a damping of boundary layer eddies. Snapshot calculations of the broken cloud case suggest a slight increase in radiative cooling, although few systematic differences are noted in the interactive simulations. This result is attributed to the fact that radiative cooling is a relatively minor contribution to the total energetics. For the cloud systems in this study, the use of IPA longwave radiative transfer is sufficiently accurate to capture the dynamical behavior of boundary layer clouds. Further investigations are required to generalize this conclusion for other cloud types and longer time integrations.en_US
dc.publisherAmerican Meteorological Societyen_US
dc.subjectClouds
dc.subjectBoundary layer
dc.subjectLongwave radiation
dc.subjectRadiative forcing
dc.subjectRadiative transfer
dc.titleMultidimensional Longwave Forcing of Boundary Layer Cloud Systemsen_US
dc.typeArticle
kusw.kuauthorMechem, David B.
kusw.kudepartmentGeographyen_US
kusw.kudepartmentEnvironmental Studiesen_US
dc.identifier.doi10.1175/2008JAS2733.1
kusw.oaversionScholarly/refereed, publisher version
kusw.oapolicyThis item does not meet KU Open Access policy criteria.
dc.rights.accessrightsopenAccess


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