A New Method for Incorporating Point Sources Into Eulerian Dispersion Models

Different parameterizations of subgrid-scale fluxes are utilized in a nonhydrostatic and anelastic mesoscale model to study their influence on simulated Arctic cold air outbreaks. A local closure, a profile closure and two nonlocal closure schemes are applied, including an improved scheme, which is based on other nonlocal closures. It accounts for continuous subgrid-scale fluxes at the top of the surface layer and a continuous Prandtl number with respect to stratification. In the limit of neutral stratification the improved scheme gives eddy diffusivities similar to other parameterizations, whereas for strong unstable stratifications they become much larger and thus turbulent transports are more efficient. It is shown by comparison of model results with observations that the application of simple nonlocal closure schemes results in a more realistic simulation of a convective boundary layer than that of a local or a profile closure scheme. Improvements are due to the nonlocal formulation of the eddy diffusivities and to the inclusion of heat transport, which is independent of local gradients (countergradient transport).

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“…Schltinzen and Krell, 1994;Schltinzen and Krell, 1994), and to study tracer transports (e.g. Bigalke, 1992;Schltinzen and Pahl, 1992).…”

Section: Model Descriptionmentioning

confidence: 99%

Modelling the arctic convective boundary-layer with different turbulence parameterizations

Lüpkes

Schlünzen²

1996

Boundary-Layer Meteorol

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Sensitivity of sulphate aerosol size distributions and CCN concentrations over North America to SO_x emissions and H₂O₂ concentrations

Salzen¹,

Leighton²,

Ariya³

et al. 2000

J. Geophys. Res.

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A New Method for Incorporating Point Sources Into Eulerian Dispersion Models

Cited by 2 publications

References 8 publications

Modelling the arctic convective boundary-layer with different turbulence parameterizations

Modelling the arctic convective boundary-layer with different turbulence parameterizations

Sensitivity of sulphate aerosol size distributions and CCN concentrations over North America to SO_x emissions and H₂O₂ concentrations

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A New Method for Incorporating Point Sources Into Eulerian Dispersion Models

Cited by 2 publications

References 8 publications

Modelling the arctic convective boundary-layer with different turbulence parameterizations

Modelling the arctic convective boundary-layer with different turbulence parameterizations

Sensitivity of sulphate aerosol size distributions and CCN concentrations over North America to SOx emissions and H2O2 concentrations

Contact Info

Product

Resources

About

Sensitivity of sulphate aerosol size distributions and CCN concentrations over North America to SO_x emissions and H₂O₂ concentrations