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An intercomparison of surface energy flux measurement systems used during FIFE 1987During FIFE 1987, surface energy fluxes were measured at 22 flux sites by nine groups of scientists using different measuring systems. A rover Bowen ratio station was taken to 20 of the flux stations to serve as a reference for estimating the instrument-related differences. The rover system was installed within a few meters from the host instrument of a site. Using linear regression analysis, net radiation, Bowen ratio, and latent heat fluxes were compared between the rover measurements and the host measurements. The average differences in net radiation, Bowen ratio, and latent heat flux from different types of instruments can be up to 10, 30, and 20 percent, respectively. The Didcot net radiometer gave higher net radiation while the Swissteco type showed lower values, as compared to the corrected radiation energy balance system (REBS) model. The four-way components method and the Thornthwaite type give similar values to the REBS. The surface energy radiation balance systems type Bowen ratio systems exhibit slightly lower Bowen ratios and thus higher latent heat fluxes, compared to the arid zone evapotranspiration systems. Eddy correlation systems showed slightly lower latent heat flux in comparison to the Bowen ratio systems. It is recommended that users of the flux data take these differences into account.
Document ID
19930036608
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Nie, D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kanemasu, E. T.
(Georgia Univ. Griffin, United States)
Fritschen, L. J.
(Washington Univ. Seattle, United States)
Weaver, H. L.
(USGS Denver, CO, United States)
Smith, E. A.
(Florida State Univ. Tallahassee, United States)
Verma, S. B.
(Nebraska Univ. Lincoln, United States)
Field, R. T.
(Delaware Univ. Newark, United States)
Kustas, W. P.
(USDA, Agricultural Research Service, Beltsville MD, United States)
Stewart, J. B.
(NERC Inst. of Hydrology, Wallingford, United Kingdom)
Date Acquired
August 15, 2013
Publication Date
November 30, 1992
Publication Information
Publication: Journal of Geophysical Research
Volume: 97
Issue: D17
ISSN: 0148-0227
Subject Category
Instrumentation And Photography
Accession Number
93A20605
Funding Number(s)
CONTRACT_GRANT: NAG5-389
Distribution Limits
Public
Copyright
Other

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