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RISEddy Diffusivity and Countergradient Transport in the Convective Atmospheric Boundary Layer
Publisher: American Meteorological Society
Abstract: To describe the heat and scalar fluxes in the convective boundary layer, we propose expressions for eddy diffusivities and countergradient terms. The latter expressions can be used in a modified flux-gradient approach, ...
Model Impacts of Entrainment and Detrainment Rates in Shallow Cumulus Convection
Publisher: American Meteorological Society
Abstract: A mass flux parameterization scheme for shallow cumulus convection is evaluated for a case based on observations and large eddy simulation (LES) results for the Barbados Oceanographic and Meteorological Experiment (BOMEX). ...
Local Versus Nonlocal Boundary-Layer Diffusion in a Global Climate Model
Publisher: American Meteorological Society
Abstract: The results of a local and a nonlocal scheme for vertical diffusion in the atmospheric boundary layer are compared within the context of a global climate model. The global model is an updated version of the NCAR Community ...
Evaluation of the Kinetic Energy Approach for Modeling Turbulent Fluxesin Stratocumulus
Publisher: American Meteorological Society
Abstract: The modeling of vertical mixing by a turbulence scheme on the basis of prognostic turbulent kinetic energy (E) and a diagnostic length scale (l) is investigated with particular emphasis on the representation of entrainment. ...
Simulation of Surface Fluxes and Boundary Layer Development over the Pine Forest in HAPEX-MOBILHY
Publisher: American Meteorological Society
Abstract: The interaction of the atmospheric boundary layer with the heterogeneous pine forest in HAPEX-MOBILHY on a scale of order 10 km is studied. A state-of-the-art, coupled atmosphere-soil-vegetation model is used and is run ...
Influence of Soil Moisture on Boundary Layer Cloud Development
Publisher: American Meteorological Society
Abstract: The daytime interaction of the land surface with the atmospheric boundary layer (ABL) is studied using a coupled one-dimensional (column) land surface?ABL model. This is an extension of earlier work that focused on modeling ...
A Simple Scheme for Daytime Estimates of the Surface Fluxes from Routine Weather Data
Publisher: American Meteorological Society
Abstract: In this paper a simple empirical scheme is presented, which gives hourly estimates of the surface fluxes of heat and momentum from routine weather data during daytime. The scheme is designed for grass surfaces, but it ...
Estimation of Surface Radiation and Energy Flux Densities from Single-Level Weather Data
Publisher: American Meteorological Society
Abstract: A scheme is proposed that relates surface flux densities of sensible heat, latent heat, and momentum to routine weather data. The scheme contains parameterizations concerning the radiation components and the surface energy ...
A Simple Parameterization of the Surface Fluxes of Sensible and Latent Heat During Daytime Compared with the Penman-Monteith Concept
Publisher: American Meteorological Society
Abstract: A comparison is made between two methods for determining the surface fluxes of sensible and latent heat during daytime. The first method, known as the Penman-Monteith approach, incorporates a more complete description of ...
Impact of Skewness and Nonlocal Effects on Scalar and Buoyancy Fluxes in Convective Boundary Layers
Publisher: American Meteorological Society
Abstract: Large-eddy simulation (LES) results of three prototype convective boundary layers (CBL) are used to study flux budgets and to test simple expressions for scalar and buoyancy fluxes. The simulated CBLs differ in their ...