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Sensible heat flux - Radiometric surface temperature relationship for eight semiarid areasMeasurements of sensible heat flux, radiometric surface temperature, air temperature, and wind speed made at eight semiarid rangeland sites were used to investigate the sensible heat flux-aerodynamic resistance relationship. The individual sites covered a wide range of vegetation (0.1-4 m tall) and cover (3%-95% bare soil) conditions. Mean values of k/B, a quantity related to the resistance of heat versus momentum transfer at the surface, for the individual sites varied between 3.5 and 12.5. A preliminary test of the utility of an excess resistance based on the mean value of k/B showed that the difference between the mean estimated and measured sensible heat fluxes varied +/- 60 W/sq m for the eight semiarid sites. For the eight sites the values of k/B were plotted against the roughness Reynolds number. The plot showed considerable scatter with values ranging between and beyond the theoretical curves for bluff rough and permeable rough surfaces.
Document ID
19950034565
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Stewart, J. B.
(Inst. of Hydrology, Wallingford, Oxfordshire United Kingdom)
Kustas, W. P.
(USDA-ARS, Beltsville, MD United States)
Humes, K. S.
(USDA-ARS, Beltsville, MD United States)
Nichols, W. D.
(USGS Water Resources Division, Carson City, NV United States)
Moran, M. S.
(USDA-ARS, Phoenix, AZ United States)
De Bruin, H. A. R.
(Agricultural Univ. Wageningen, Netherlands)
Date Acquired
August 16, 2013
Publication Date
September 1, 1994
Publication Information
Publication: Journal of Applied Meteorology
Volume: 33
Issue: 9
ISSN: 0894-8763
Subject Category
Earth Resources And Remote Sensing
Accession Number
95A66164
Distribution Limits
Public
Copyright
Other

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