HR: 0800h
AN: H21H-0829    [Abstracts]
TI: Estimation of Evapotranspiration Using Optical Scintillometry
AU: * Gomez, J
AF: New Mexico Tech, 801 Leroy Place, Socorro, NM 87801, United States
AU: Kleissl, J
EM: jkleissl@ucsd.edu
AF: University of California at San Diego, La Jolla, San Diego, CA 92093, United States
AU: Hendrickx, J M
EM: hendrick@nmt.edu
AF: New Mexico Tech, 801 Leroy Place, Socorro, NM 87801, United States
AU: Hartogensis, O K
EM: Oscar.Hartogensis@wur.nl
AF: Wageningen University, Wageningen, Wageningen, 94303, Netherlands
AU: Hong, S H
EM: hong@nmt.edu
AF: New Mexico Tech, 801 Leroy Place, Socorro, NM 87801, United States
AU: Rahn, T
EM: trahn@lanl.gov
AF: Los Alamos National Laboratory, Los Alamos, Socorro, NM 87544, United States
AB: The estimation of spatial and temporal distributions of evapotranspiration is a long standing challenge for hydrologic science. In this study we present our experiences with the new technology of scintillometry for estimation of evapotranspiration over transects with lengths between 200 and 5,000 m. Large Aperture Scintillometers operating at optical wavelengths are employed to measure the sensible heat flux over dry desert grasslands in the Middle Rio Grande Valley and over moist grasslands in the Valles Caldera. Net radiation and soil heat fluxes are measured with a 4 component net radiation meter and soil heat flux plates, respectively, and evaluated with remote sensing algorithms. The evapotranspiration is estimated as the difference between net radiation minus the sum of sensible heat flux and soil heat flux. The estimated daily and instantaneous evapotranspiration rates are compared with eddy covariance measurements. We will evaluate the potential of scintilllometers for reliable and robust evaluation of evapotranspiration rates for hydrologists.
DE: 1814 Energy budgets
DE: 1818 Evapotranspiration
DE: 1843 Land/atmosphere interactions (1218, 1631, 3322)
SC: Hydrology [H]
MN: 2007 Fall Meeting