HR: 1330h
AN: H23B-03    [Abstracts]
TI: Bulk Surface Momentum Parameters for Satellite-Derived Vegetation Fields
AU: * Jasinski, M F
EM: Michael.F.Jasinski@nasa.gov
AF: NASA Goddard Space Flight Center, Hydrological Sciences Branch, Code 614.3, Greenbelt, MD 20771 United States
AU: Borak, J S
EM: borak@hsb.gsfc.nasa.gov
AF: Science Systems and Applications, Inc, 10210 Greenbelt Rd, Suite 600, Lanham, MD 20706 United States
AU: Crago, R D
EM: rcrago@bucknell.edu
AF: Bucknell University, Department of Civil and Environmental Engineering, Lewisburg, PA 17837 United States
AB: Most numerical atmospheric simulation models and land surface hydrology models used today require knowledge of aerodynamic roughness in the parameterization of surface fluxes. In this paper, the bulk parameters associated with the absorption of surface momentum by vegetated landscapes are theoretically estimated within the context of Raupach's roughness sublayer formulation and the canopy area index. The estimated parameters include the bulk plant drag coefficient, maximum u_*/u_h, sheltering coefficient, and canopy area density at onset of sheltering. The test case includes the U.S. Southern Great Plains, that includes four principal IGBP land classes; Evergreen needleleaf, grassland, crops, and savanna/shrub. The estimation approach uses the Method of Moments and roughness data from several international field experiments and other published data. The above procedure provides a physically based approach for estimating roughness length for seasonally variable vegetation fields using satellite data.
DE: 1833 Hydroclimatology
DE: 3307 Boundary layer processes
DE: 3360 Remote sensing
SC: Hydrology [H]
MN: 2005 Joint Assembly