An analysis of the GATE aircraft pyrgeometer instrumentation

Albrecht, Bruce A., author
Cox, Stephen K., author
Prokofyev, Mikhail Alekseevich, author
Department of Atmospheric Science, Colorado State University, publisher
Journal Title
Journal ISSN
Volume Title
Colorado State University. Libraries
Significant differences in US and USSR aircraft measurements of hemispherical infrared irradiance were noted during GATE in-flight intercomparisons. In specific instances the downward irradiance measured by the USSR instrument (a Kozyrev pyrgeometer) was as much as 1.5 times greater than the irradiance measured with the US instrument (an Eppley pyrgeometer). A post-GATE intercomparison at Colorado State University verified these differences; the pyrgeometer measurements were compared with independent measurements obtained with an infrared bolometer and with a radiative transfer calculation. The differences noted during GATE and post-GATE intercomparisons may be attributed to differences in calibration techniques and the accurate determination of the temperature of the instrument's thermopile cold junctions. When corrections based upon this analysis were applied to the USSR data, the maximum intercomparison differences were less than 5 percent.
Includes bibliographical references (page 28).
November 1976.