Further e\ idelice i s prcseiited for the prcsericc of a persistent pcriodicity somewhat in excess of 2 years duration. I t s existence can be shown in the surface temperature a t widely separated stations along two ineridiaiis from Norway t o South Africa and from Canada to Cape Horn. Time series analysis by means of a narrow band-pass filter indicates phase relations among the stations, the most iinportant of theae being t h a t t h e intertropical rcgions appear to be mutually in phase and that the higher-latitude statioiis are out of phase with the tropical stations. In the Northern Hemisphere, a t extratropical stations, the amplitudes of thc pulse arc largest when the pulsc extremes coincide with the winter months.
Wind-data presentations are varied. Some serve one purpose better than another. A relatively new type of wind rose is presented in order that its potential may be exploited. This is the standard vector-deviation wind rose. It is an easily reproduced rose and may be constructed from values of the vector mean wind, standard deviations of the latitudinal and meridional wind components, and the correlation between the components. If the distribution is circular, rather than elliptical, only the vector mean and the standard vector deviation are needed. Methods to test for ellipticity and to construct the roses are given.
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