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Jay S. Winston

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Jay S. Winston

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Jay S. Winston

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Examination of 5-day mean radiation data over the Pacific sector with respect to latitude and time reveals well-marked continuity of the radiation maxima and minima. Variations in the radiation features for the Northern Hemisphere, particularly the pronounced south-north gradient in radiation northward from the subtropics, indicate some definite relationships to variations in the intensity of the westerly circulation, with stronger gradients when the westerlies are strong. Analysis of 5-day mean long-wave radiation data at 45N over the Pacific sector with respect to longitude and time also reveals clear-cut continuity which, to a great extent, is related to the mid-tropospheric wave pattern at 45N. Although the scale of the radiation pattern is smaller than that of the 500-mb height field, preferred positions of radiation maxima and minima relative to the wave pattern are indicated.

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Jay S. Winston

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Statistics of planetary wave number and wave length as observed on 5-day mean 700-mb charts are presented for each ten degrees of latitude between 30N and 70N for each month of the year. These statistics show that there tend to be fewer waves around latitude circles in the colder half of the year. As might be expected from the variation in the length of latitude circles, there are more waves at tower latitudes than at high latitudes, but wave lengths are actually longer at middle and low latitudes than at high latitudes. The monthly and latitudinal variations in the longitudinal dimensions of waves are explained to a moderate degree by variations in physical parameters suggested by theoretical and laboratory models. Specifically, it has been found that wave length exhibits a direct relationship to thermal Rossby number, zonal wind speed in mid-troposphere, and static stability.

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Jay S. Winston

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Jay S. Winston

The annual course of zonal wind speed at 700 mb for latitudes 20° to 90 °N is portrayed in three ways—from monthly normal data, from monthly mean data averaged over a recent seven year period, and from 5-day mean data averaged over the same seven years. In a broad sense these representations have much in common, but the 5-day data reveal certain well-marked shorter period variations in the westerlies which appear to be related to singularities of the general circulation.

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Jay S. Winston

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THE CLIMATE OF SPRING 1982

A Season of Abnormally Strong Subtropical Westerlies

Jay S. Winston

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JAY S. WINSTON

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JAY S. WINSTON

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