Second-moment budgets in cloud topped boundary layers: A large-eddy simulation study

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dc.identifier.uri Heinze, Rieke Mironov, Dmitrii Raasch, Siegfried 2015-08-04T12:47:18Z 2015-08-04T12:47:18Z 2015
dc.identifier.citation Heinze, Rieke; Mironov, Dmitrii; Raasch, Siegfried: Second-moment budgets in cloud topped boundary layers: A large-eddy simulation study. In: Journal of Advances in Modeling Earth Systems 7 (2015), Nr. 2, S. 510-536. DOI:
dc.description.abstract A detailed analysis of second-order moment budgets for cloud topped boundary layers (CTBLs) is performed using high-resolution large-eddy simulation (LES). Two CTBLs are simulated—one with trade wind shallow cumuli, and the other with nocturnal marine stratocumuli. Approximations to the ensemble-mean budgets of the Reynolds-stress components, of the fluxes of two quasi-conservative scalars, and of the scalar variances and covariance are computed by averaging the LES data over horizontal planes and over several hundred time steps. Importantly, the subgrid scale contributions to the budget terms are accounted for. Analysis of the LES-based second-moment budgets reveals, among other things, a paramount importance of the pressure scrambling terms in the Reynolds-stress and scalar-flux budgets. The pressure-strain correlation tends to evenly redistribute kinetic energy between the components, leading to the growth of horizontal-velocity variances at the expense of the vertical-velocity variance which is produced by buoyancy over most of both CTBLs. The pressure gradient-scalar covariances are the major sink terms in the budgets of scalar fluxes. The third-order transport proves to be of secondary importance in the scalar-flux budgets. However, it plays a key role in maintaining budgets of TKE and of the scalar variances and covariance. Results from the second-moment budget analysis suggest that the accuracy of description of the CTBL structure within the second-order closure framework strongly depends on the fidelity of parameterizations of the pressure scrambling terms in the flux budgets and of the third-order transport terms in the variance budgets. eng
dc.description.sponsorship COST/ES/0905
dc.description.sponsorship DFG
dc.language.iso eng eng
dc.publisher Hoboken : Wiley Periodicals
dc.rights CC BY-NC-ND 4.0 Unported
dc.subject large-eddy simulation eng
dc.subject cloud topped boundary layers eng
dc.subject atmospheric turbulence eng
dc.subject modeling eng
dc.subject parameterizations eng
dc.subject second-moment budgets eng
dc.subject LES eng
dc.subject boundary layer process eng
dc.subject Subgrid-scale parameterization eng
dc.subject SGS eng
dc.subject large eddy simulation eng
dc.subject Grobstruktursimulation ger
dc.subject Large Eddy Simulation ger
dc.subject LES ger
dc.subject Meteorlogie ger
dc.subject Atmosphärische Turbulenz ger
dc.subject Parametrisierung ger
dc.subject Grenzschichtprozess ger
dc.subject.classification LES ger
dc.subject.classification Atmosphärische Turbulenz ger
dc.subject.classification Parametrisierung ger
dc.subject.classification Grenzschicht ger
dc.subject.ddc 550 | Geowissenschaften ger
dc.title Second-moment budgets in cloud topped boundary layers: A large-eddy simulation study eng
dc.type Article
dc.type Text
dc.relation.essn 1942-2466
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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