Accession Number : AD0702236

Title :   RADIATION DATA AND ANALYSES FOR THE 1966 AND 1967 MICROMETEOROLOGICAL FIELD RUNS AT DAVIS, CALIFORNIA.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV DAVIS DEPT OF WATER SCIENCE AND ENGINEERING

Personal Author(s) : Morgan,D. L. ; Pruitt,W. O. ; Lourence,F. J.

Report Date : FEB 1970

Pagination or Media Count : 53

Abstract : 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)

Descriptors :   (*ATMOSPHERES, SOLAR RADIATION), (*SOLAR RADIATION, MEASUREMENT), MICROMETEOROLOGY, CLOUD COVER, ENERGY, PYRHELIOMETERS, RADIATION PYROMETERS, HEAT FLUX, CLOUDS, CLASSIFICATION, STATISTICAL ANALYSIS, CALIFORNIA

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE