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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.
Copyright 1996 by the American Geophysical Union.
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