EASTWARD-MOVING DISTURBANCE NEAR THE TROPOPAUSE ALONG THE EQUATOR DURING THE TOGA COARE IOP

The three eastward-moving disturbances localized near the tropopause d uring January and February 1993 were investiated using (Japan Meteorol ogical Agency) global analysis data and the rawinsonde data at some st ations during the TOGA COARE IOP (November 1992-February 1993). These events are considered to be part of equatorial trapped internal Kelvin waves with upward energy propagation. These waves have large amplitud e only in the several ten degree longitudes around the western Pacific . In January, the wave form is far from a sinusoidal one when the ampl itude becomes very large. Change from the easterly to the westerly is much more rapid than change from the westerly to the easterly.