Accession Number:

AD0678080

Title:

An Experiment in Numerical Prediction in Equatorial Latitudes

Descriptive Note:

Scientific rept.

Corporate Author:

NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF METEOROLOGY

Personal Author(s):

Report Date:

1968-10-01

Pagination or Media Count:

82.0

Abstract:

In order to obtain the dynamical structure of the tropical atmosphere in equatorial latitudes a short range prediction experiment is proposed. The initial field contains the intertropical convergence zone and associated disturbances over western Pacific Ocean during March 1965. A complete initial state is constructed using a consistent balance system of equations. The procedure involves construction of pressure, temperature and vertical motion distributions starting from an observed rotational part of the wind field. It is shown that this procedure, whose validity assumes a small Rossby number, does not yield a realistic structure of the vertical motion. A short range prediction with a multi-level prediction model yields some interesting solutions in the vicinity of the intertropical convergence zone. During the first 18 hours of prediction an adjustment of the motion and the mass field ensues with gravity inertia oscillations. A detailed discussion of some dynamical aspects at 24 hours is presented. An important feature of the model is a parameterization of cumulus convection as a function of large-scale moisture convergence. The role of cumulus scale heating in the vicinity of the intertropical convergence zone is explored by carrying out experiments with and without diabatic heating. Author

Subject Categories:

  • Meteorology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE