publications by Roni Avissar.


Papers Published

  1. Avissar, Roni and Eloranta, Edwin W. and Gurer, Kemal and Tripoli, Gregory J., Evaluation of the large-eddy simulation option of the regional atmospheric modeling system in simulating a convective boundary layer: a FIFE case study, Journal of the Atmospheric Sciences, vol. 55 no. 7 (1998), pp. 1109 - 1130 [1520-0469(1998)055<1109:AEOTLE>2.0.CO;2] .
    (last updated on 2007/03/27)

    Abstract:
    A large-eddy simulation (LES) model was used to simulate the convective boundary layer (CBL) that developed over the domain of the First International Satellite Land Surface Climatology Project Field Experiment (FIFE). Three simulations were produced using different boundary conditions at the ground surface. The diurnal variation of mean surface fluxes and their spatial distribution were derived from the FIFE network of observations. The mean profiles of temperature and specific humidity were compared to those observed with atmospheric soundings at 0900, 1030, and 1230 local time. The simulated structure of turbulence was qualitatively compared with that obtained from a volume-image lidar (VIL) scanning the CBL over the simulated domain during that day. Power spectra and autocorrelations of mixing were calculated from the model outputs and were compared to those obtained from the VIL. In general, the model performed very well.

    Keywords:
    Computer simulation;Mathematical models;Boundary conditions;Heat flux;Atmospheric temperature;Atmospheric humidity;Correlation methods;Spectrum analysis;Calculations;