On the half-yearly oscillations in the tropics

Abstract
The half-yearly component in the annual march of mean temperature and geostrophic zonal wind, below 100 mb and between 60° E and 120° E, is described by means of cross sections from pole to pole. We suggest that the second harmonics in the temperature, of opposite phase on the equator and in the subtropics, are linked with the position of the rising branch of the Hadley circulation twice a year near the equator. DOI: 10.1111/j.2153-3490.1970.tb00504.x

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