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Interannual variability in the stratospheric‐tropospheric circulation in a Coupled Ocean‐Atmosphere GCM
Author(s) -
Kitoh Akio,
Koide Hiroshi,
Kodera Kunihiko,
Yukimoto Seiji,
Noda Akira
Publication year - 1996
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/96gl00158
Subject(s) - troposphere , climatology , empirical orthogonal functions , polar vortex , atmosphere (unit) , environmental science , atmospheric circulation , atmospheric sciences , gcm transcription factors , sea surface temperature , general circulation model , geology , meteorology , climate change , oceanography , physics
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.