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Intercomparison of Sensible Heat Flux from Large Aperture Scintillometer and Eddy Covariance Methods: Field Experiment over a Homogeneous Semi-arid Region |
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| Authors: | Dawit A Zeweldi Mekonnen Gebremichael Junming Wang Theodore Sammis Jan Kleissl David Miller |
| Institution: | 1. Civil and Environmental Engineering Department, University of Connecticut, 261 Glenbrook Road, Unit 2037, Storrs, CT, 06269-2037, USA 2. Department of Agronomy and Horticulture, New Mexico State University, Las Cruces, NM, 88003-8001, USA 3. Department of Mechanical and Aerospace Engineering, University of California-San Diego, San Diego, CA, 92093-0411, USA 4. Natural Resources management and Engineering Department, University of Connecticut, Storrs, CT, 06269-4087, USA |
| Abstract: | Scintillometers are becoming increasingly popular for the validation of satellite remote sensing sensible heat-flux estimates due to the comparable spatial resolutions. However, it is important to gain confidence in the accuracy of the sensible heat-flux measurements obtained by the scintillometer. Large aperture scintillometer (LAS) and eddy-covariance (EC) measurements were collected over a homogeneous, dry and semi-arid region near Las Cruces, New Mexico, USA, where the homogeneity allowed direct comparison of the two instruments despite their differences in footprint sizes. The differences between the sensible heat-flux measured by both LAS and EC systems fall within the differences between two EC systems. We conclude that the large aperture scintillometer is a reliable system for measuring sensible heat flux in a dry semiarid region. |
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