Waves at 200 mb during GATE

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  • 1 Department of Meteorology, Florida State University, Tallahassee 32306
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Abstract

A 200 mb data set obtained during the GATE experiment of the 1974 summer for the period 15 June-23 September and covering the global tropics 25°S to 45°N has been analyzed to determine the presence of certain wave modes in the tropical troposphere.

The wavenumber-frequency method of analysis was used and the flow separated into eastward and westward moving waves. Results show what could be identified as Kelvin, Rossby and mixed Rossby- gravity waves. The period of the Kelvin wave was longer than that normally reported for similar waves in the stratosphere.

Abstract

A 200 mb data set obtained during the GATE experiment of the 1974 summer for the period 15 June-23 September and covering the global tropics 25°S to 45°N has been analyzed to determine the presence of certain wave modes in the tropical troposphere.

The wavenumber-frequency method of analysis was used and the flow separated into eastward and westward moving waves. Results show what could be identified as Kelvin, Rossby and mixed Rossby- gravity waves. The period of the Kelvin wave was longer than that normally reported for similar waves in the stratosphere.

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