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Low-Frequency Oscillations of the Large-Scale Stratospheric Temperature Field

Xin Hai GaoPhysics Department, Iowa State University, Ames, IA 50011

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John L. StanfordPhysics Department, Iowa State University, Ames, IA 50011

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Abstract

Low-frequency analyses are reported for four years of 3-day-mean satellite microwave and infrared data representative of temperatures in the stratosphere. In data representative of 30–150 mb temperatures oscillations with 39–51 day periods are observed as a tropical dipole pattern in the Indonesia/central Pacific. In addition, the first evidence is presented for such oscillations in the southeast Pacific. Furthermore, significant 39–51 day oscillations are observed in the mid- and upper stratosphere, centered near 60°S latitude.

Abstract

Low-frequency analyses are reported for four years of 3-day-mean satellite microwave and infrared data representative of temperatures in the stratosphere. In data representative of 30–150 mb temperatures oscillations with 39–51 day periods are observed as a tropical dipole pattern in the Indonesia/central Pacific. In addition, the first evidence is presented for such oscillations in the southeast Pacific. Furthermore, significant 39–51 day oscillations are observed in the mid- and upper stratosphere, centered near 60°S latitude.

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