HR: 0800h
AN: A41D-07    [Abstracts]
TI: Numerical Modeling of Topography-Related Heterogeneity in the Atmospheric Boundary Layer: Implication for Area-Averaged Estimates of Surface Fluxes
AU: * Mostovoy, G V
EM: mostovoi@gri.msstate.edu
AF: GeoResources Institute, Mississippi State University, HPCC, 2 Research Blvd., Starkville, MS 39759, United States
AU: Anantharaj, V
EM: val@gri.msstate.edu
AF: GeoResources Institute, Mississippi State University, HPCC, 2 Research Blvd., Starkville, MS 39759, United States
AU: Nair, U
EM: nair@nsstc.uah.edu
AF: Department of Atmospheric Sciences, University of Alabama in Huntsville, 320 Sparkman Drive, Huntsville, AL , United States
AB: Numerical simulations with the Regional Atmospheric Modeling System (RAMS) were used to study surface fluxes perturbations within the atmospheric boundary layer, caused by topography variations at horizontal scales less than 100 meters. Previous studies have shown that the integral effects, averaged over typical distances of 1 km or more, of these surface fluxes perturbations might be as high as 10% as compared with those over a flat surface. We examined area-averaged effects of these perturbations simulated with RAMS over a surface topography represented by an isolated hill and a series of bell-shaped low hills. Both 2D and 3D RAMS simulations were used with different background meteorological conditions and slope values. Particular attention will be paid on potential decomposition of fluxes integral changes into different parts associated with a direct effect of a surface area increase and wind speed, air temperature and humidity changes.
DE: 3307 Boundary layer processes
DE: 3329 Mesoscale meteorology
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly