On a New Expression for the Diurnal Variation of Air Temperature

Abstract

A new expression A0+A sin (σt -γsinσt+ε) is suggested by the author to show the diurnal variation of air temperature. Method for finding the four constants A0, A, and is given and its applicability and the degree of approximation are discussed by some actual data. Physical remarks and some applications to climatology are also given in this paper. A noticeable success is the discovery of an expression with only the diurnal single period, not containing the semi-diurnal or other higher harmonic periods which are of no physical significance.