Accession Number:

AD0292145

Title:

DIRECT MEASUREMENT OF THE MERIDIONAL CIRCULATION IN THE STRATOSPHERE DURING THE IGY

Descriptive Note:

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s):

Report Date:

1962-10-15

Pagination or Media Count:

1.0

Abstract:

The mean meridional circulation in the stratosphere of the northern hemisphere is determined from IGY data available for a network of approximately 240 stations during the period July 1957 - June 1958. Zonal averages for every 5 degrees latitude from the equator to 80 degrees N are presented. The yearly average suggests at 100 mb a three cell pattern with poleward motion north of 55 degrees N, equatorial motion from 15 to 55 degrees N and weak poleward motion from the equator to 15 degrees N. At higher levels equatorward motions are observed in middle and low latitudes. The highest meridional velocity of 60 cmsec is observed at 70 degrees N at the 100 mb level. These averages are compared with similar results for the southern hemisphere. Vertical velocities, computed adiabatically at 75 and 40 mb, made it possible to estimate the contribution of the diabatic heating to the horizontal meridional velocities at 50 mb, and also to give an estimate of the diabatic heating itself. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE