SYNTHESIS OF 500-MB. HEIGHT AND TEMPERATURE DATA BY CONSIDERATION OF SURFACEPRESSURE AND TEMPERATURE AND THE BEHAVIOR OF DENSITY WITH HEIGHT1

A procedure for synthesizing 500-mb. height and temperature data over oceanic areas using only sea level data as an input is developed. The procedure is tested by comparing the synthetic data to observed 500-mb. data at 4YN and 4YP and by comparing 500-mb. synthetic data charts to 500-mb. charts based on observed data. The North Pacific is chosen for the latter test. The 500-mb. height variations given by synthetic data compare favorably with the observed height variations at 4YN and 4YP. While certain errors are apparent in the synthetic 500-mb. chart it does show many of the features of the chart produced from observed data.