Analysis of the GATE aircraft pyrgeometer instrumentation, An
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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 ...