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GEOPHYSICAL RESEARCH LETTERS, VOL. 23, NO. 5, PAGES 543–546, 1996

Interannual Variability in the Stratospheric-Tropospheric Circulation in a Coupled Ocean-Atmosphere GCM

Akio Kitoh

Meteorological Research Institute, Tsukuba, Ibaraki, Japan


Hiroshi Koide

Meteorological Research Institute, Tsukuba, Ibaraki, Japan


Kunihiko Kodera

Meteorological Research Institute, Tsukuba, Ibaraki, Japan


Seiji Yukimoto

Meteorological Research Institute, Tsukuba, Ibaraki, Japan


Akira Noda

Meteorological Research Institute, Tsukuba, Ibaraki, Japan


Abstract

Relationships between the northern winter stratospheric and tropospheric circulations and the sea surface temperature (SST) simulated by a global coupled ocean-atmosphere general circulation model are investigated. Two modes are extracted for interannual variability of the zonal-mean zonal wind by an empirical orthogonal function analysis. The first mode is related with interannual variations of the stratospheric polar vortex. This mode has a significant correlation with the North Pacific SST through tropospheric circulation changes. The second mode is the variation of the tropospheric subtropical jet and is related with the simulated El Niño. Model results imply no strong relationship between El Niño and the polar vortex.

Received 22 September 1995; accepted 9 January 1996.

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Citation: Kitoh, A., H. Koide, K. Kodera, S. Yukimoto, and A. Noda (1996), Interannual Variability in the Stratospheric-Tropospheric Circulation in a Coupled Ocean-Atmosphere GCM, Geophys. Res. Lett., 23(5), 543–546.