Radiation Data and Analyses for the 1966 and 1967 Micrometeorological Field Runs at Davis, California
Technical Report
Description:... The report presents basic radiation data gathered at the University of California at Davis during nine intensive micrometeorological data-gathering periods in 1966 and 1967. A comparison is made between measurements of the total incoming solar radiation taken with an Eppley pyranometer and the combination of two components of incoming solar radiation measured by a tracking pyrheliometer and a shaded pyranometer, respectively. The results indicate relatively small differences between the sums of the components and the measured totals giving a high degree of confidence in these data. Two independent checks of the measured net radiation, a key in energy balance consideration, are made. A comparison of measured net radiation with the proper combination of other measured radiation components, the first independent check, shows very close agreement between the two for both clear- and cloudy-sky conditions. The second method of checking the measured net radiation, incorporating an estimate of the longwave atmospheric radiation, agrees closely for clear-sky periods but underestimates the measured net radiation for cloudy conditions. Various methods of estimating atmospheric radiation including the use of radiation charts and six empirical formulae are examined. (Author).
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