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VAN M. POLOWCHAK and H. A. PANOFSKY

Abstract

After removal of the annual variation, daily temperatures at 17 North American stations were subjected to spectrum analysis. Winter spectra at west coast maritime stations were characterized by energy mostly at periods of the order of 2 weeks, whereas at east coast stations, most of the variance was produced with periods of the order of a week, with intermediate spectra in the center of the continent.

In summer, the spectra were flatter and maxima less distinct; still, the shorter periods predominated at the northeast coast.

From the spectra, a “rhythm” index was defined which quantitatively characterizes the rhythm of the temperature variation in the various regions of North America.

The variance of temperature deviations from normal was also computed and appears to be an index of continentality.

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CHIN-HUA HUANG, H. A. PANOFSKY, and ARTHUR SCHWALB

Abstract

Various synoptic variables are related to satellite radiation data. It is shown that: (1) Vertical motion is related jointly to window radiation and water vapor radiation. (2) Surface relative humidity can be estimated from window radiation and cloud brightness. (3) Ceilings can be estimated from window radiation and cloud brightness.

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