Abstract
Diurnal variations of air temperature and four other weather variables are presented for an oceanographic cruise that sailed along 35°N from California to Japan during March and April, 1976. The data were sampled every two hours for 35 days. Air temperature shows a double maximum, one before and one after a noon minimum, on several individual days and in the average over all days. A similar phenomenon was described 30 years ago for air temperaturesfrom two weather ships in the western Pacific. The only existing explanation, adiabatic heating due to the semidiurnal pressure variation, is shown to be too small to account for the morning maximum in the present temperature data. No alternative explanation is offered at this time.
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