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  • Author or Editor: H. A. Panofsky x
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H. A. Panofsky

Abstract

The theory of a number of different techniques for the computation of vertical motion in the atmosphere is discussed. A comparison of two independent techniques shows that both usually yield vertical velocities of the correct sign and order of magnitude.

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H. A. Panofsky

Abstract

Radiative cooling is computed for a warm, isothermal atmosphere streaming out over a cold surface. The study shows that the rate of cooling at heights from a few centimeters up to a few meters varies inversely as the square root of the distance from the ground, and that it varies somewhat more rapidly at larger distances.

The difference in radiative cooling at low levels between an isothermal and an adiabatic atmosphere is computed and found to be negligible in comparison with values derived from the isothermal atmosphere.

Comparison of radiative with observed cooling shows that radiative cooling is relatively small compared with cooling by turbulence in winds around 15 mph.

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H. L. Griffith, H. A. Panofsky, and I. Van der Hoven

Abstract

It is shown that a spectrum covering a large range of frequencies can be found by superposing estimates of spectra of means over periods of different lengths. The method is illustrated by the power spectrum of temperature at University Park, Pennsylvania, covering periods from 2 to 7300 days. The spectrum is characterized by a major peak at four days and several minor ones, the reality of which is uncertain.

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