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An inter-comparison of surface energy flux measurement systems used during FIFE, 1987During the first International Satellite Land Surface Climatology Program Field Experiment (FIFE-87), 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 nearly all 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. Net radiation, Bowen ratio, and latent heat fluxes were compared between the rover and the host for the stations visited. Linear regression analysis was used to examine the relationship between rover measurements and host measurements. These inter-comparisons are needed to examine the influence of instrumentation on measurement uncertainty. Highly significant effects of instrument type were detected from these comparisons. Instruments of the same type showed average differences of less than 5 percent for net radiation, 10 percent for Bowen ratio, and 6 percent for latent heat flux. The corresponding average differences for 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 REBS model. The 4-way components methed and the Thornswaite type give similar values to the REBS. The SERBS type Bowen ratio systems exhibit slightly lower Bowen ratios and thus higher latent heat fluxes, compared to the AZET systems. Eddy correlation systems showed slightly lower latent heat flux in comparison to the Bowen ratio systems.
Document ID
19910007159
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Nie, D. (Kansas State Univ. Manhattan., United States)
Kanemasu, E. T. (Georgia Univ. Griffin., United States)
Fritschen, L. J. (Washington Univ. Seattle., United States)
Weaver, H. (Geological Survey 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. (Department of Agriculture Beltsville, MD., United States)
Stewart, J. B. (Institute of Hydrology Wallingford, United Kingdom)
Date Acquired
September 6, 2013
Publication Date
January 1, 1990
Subject Category
Geophysics
Report/Patent Number
NASA-CR-187699
NAS 1.26:187699
Accession Number
91N16472
Funding Number(s)
CONTRACT_GRANT: NAG5-389
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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