Abstract: Recent results from large-eddy simulations indicate that the eddy diffusivity for scalar diffusion through the top of a convective boundary layer is different from that for diffusion through the bottom. From this, one can ...

Abstract: Through the innovative use of laboratory experiments, numerical simulations, and direct measurements, researchers have greatly extended our knowledge of planetary boundary layer (PBL) structure over the last 15 years. This ...

Abstract: In mesoscale modeling the scale l of the energy- and flux-containing turbulence is much smaller than the scale ? of the spatial filter used on the equations of motion, and in large-eddy simulation (LES) it is much larger. ...

Abstract: Not available

Abstract: One-dimensional spectra are frequently used to relate features of measured and simulated meteorological field variables in the turbulent atmospheric boundary layer (ABL), but two-dimensional spectra can provide more reliable ...

Abstract: To examine the fidelity of the simulated turbulent flow, we analyzed the spectra of 96?&96?96 large-eddy-simulation results. We derived expressions for the inertial-range spectra of a filtered wind field, compared our ...

Abstract: We examine the fidelity of one-dimensional spectra of vertical velocity derived from multiple-Doppler radar observations. For analytical tractability, we use the following assumptions: 1) the turbulent atmosphere has ...

Abstract: We represent the three-dimensional, time-dependent field of a passive, conservative scalar in the conservative boundary layer as the sum of ?top-down? and ?bottom-up? components created by the scalar fluxes through the top ...

Abstract: We show that the horizontal turbulent velocity components measured by the common sonic anemometer array can suffer attenuation and crosstalk as a result of the flow blockage caused by the acoustic transducer assemblies. ...

Abstract: We show that the turbulence statistics from our (96)3 large-eddy-simulation (LES) studies of a convective boundary layer are in excellent agreement with those from the Deardorff?Willis laboratory convection tank. Using ...