HR: 16:00h
AN: H14B-01 INVITED     [Abstracts]
TI: Estimation of Land Surface Latent Heat Flux and Its Determinants Based on Remotely Sensed Measurements
AU: * Entekhabi, D
EM: darae@mit.edu
AF: MIT, 48-331, Cambridge, MA 02139 United States
AB: Evaporation from land surfaces links the water, energy and carbon cycles yet there are neither adequate in situ networks nor established remote sensing-based approaches that allow mapping of the flux. A review of the major roadblocks to estimation of evaporation fields is presented. Difficulties in establishing robust methods using existing remotely sensed measurements, principally land surface temperature and vegetation indices, will be included. It is shown that such approaches have closure requirements and that empirical closure relations are unreliable. Possible ways forward is to use adjoint state estimation with energy balance constraint. Additionally the capability of future sensing capabilities, principally surface soil moisture remote sensing, to further constrain the problem is presented. The value of Hydros, the Hydrosphere State Mission, to the estimation of latent heat flux from land surfaces is outlined.
DE: 0315 Biosphere/atmosphere interactions (0426, 1610)
DE: 1640 Remote sensing (1855)
DE: 1818 Evapotranspiration
DE: 1855 Remote sensing (1640)
DE: 1895 Instruments and techniques: monitoring
SC: Hydrology [H]
MN: Fall Meeting 2005