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  • Author or Editor: Stephen K. Cox x
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Bruce A. Albrecht, Stephen K. Cox, and Michael Prokofyev

Significant differences in U.S. and U.S.S.R. aircraft measurements of hemispherical infrared irradiance were noted during GATE in-flight intercomparisons. In specific instances the downward irradiance measured by the U.S.S.R. instrument (a Kozyrev pyrgeometer) was as much as 1.5 times greater than the irradiance measured with the U.S. 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 reference junctions. When corrections based upon this analysis were applied to the U.S.S.R. data, the maximum intercomparison differences between the U.S. and the U.S.S.R. data were <5%.

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Graeme L. Stephens, Stephen K. Cox, Paul W. Stackhouse Jr., John Davis, and the AT622 Class

This paper describes a classroom project that exposes students to research data collected during the Cirrus II First ISCCP (International Satellite Cloud Climatology Program) Regional Experiment Information Systems Office from Parsons, Kansas, during November and December 1991. The data employed in this project were primarily those obtained from a Michelson interferometer. The students were assigned a number of tasks that were aimed at (i) providing them with a basic understanding of a Michelson interferometer and, most importantly, an appreciation of the importance of calibration, (ii) understanding the spectral distribution of clear-sky emission and identifying major gaseous absorption features, (iii) understanding the effects of cirrus clouds on the emission spectrum, and finally (iv) learning how these spectra may be used to derive certain properties of the clouds and in so doing appreciate some of the limitations and ambiguities of this particular type of remote sensing.

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Stephen K. Cox, David S. McDougal, David A. Randall, and Robert A. Schiffer
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