HR: 0830h
AN: A31C-0038    [PDF]
TI: Turbulence Modeling of GABLS Stable Atmospheric Boundary Layer Intercomparison Case
AU: * Wunsch, S
EM: sewunsc@sandia.gov
AF: Sandia National Laboratories, P.O. Box 969, Livermore, CA 94551-0969 United States
AU: Kerstein, A
EM: arkerst@sandia.gov
AF: Sandia National Laboratories, P.O. Box 969, Livermore, CA 94551-0969 United States
AB: The GABLS arctic stable boundary layer intercomparison case is simulated using the One-Dimensional Turbulence (ODT) model. ODT is a single-column simulation in which vertical turbulent transport is represented by an unsteady, stochastic advective process, rather than the customary representation by a diffusive process. Unlike conventional single-column models, ODT resolves small-scale, unsteady motions and transport processes in the stable atmospheric boundary layer. In the GABLS intercomparison case, it captures small sporadic turbulent bursts that are not resolved by conventional single-column models or by large-eddy simulations. Strong property gradients in the shear-dominated near-surface boundary layer are resolved to the roughness scale, so a Monin-Obukhov-type near-surface parameterization is not needed. Results presented here include instantaneous and time-averaged vertical profiles of velocity components and potential temperature, and fluctuation statistics of turbulent fluxes and terms of the turbulent kinetic energy budget. The ODT approach is intermediate in cost between conventional single-column models and large-eddy simulations. ODT has been tested against experimental data for a number of different convective, stably-stratified, sheared, and reacting flow configurations. It has proven to be an efficient tool for studying parameter dependencies in various flows. With further development, ODT could be implemented in global circulation models to provide improved representation of vertical transport and mixing at a modest increase in computational cost.
DE: 0368 Troposphere--constituent transport and chemistry
DE: 3210 Modeling
DE: 3379 Turbulence
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting