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Free keywords:
baroclinic coupled mode; barotropic linear coupling; canonical correlation analysis; stratosphere cyclonic vortex; stratospheric circulation pattern; tropospheric circulation pattern; tropospheric goepotential height
Abstract:
The associated anomaly patterns of the stratospheric geopotential height field and the tropospheric geopotential and temperature height fields of the Northern Hemisphere are determined applying the canonical correlation analysis. With this linear multivariate technique the coupled modes of variability of time series of two fields are isolated in the space of empirical orthogonal functions. The one dataset is the 50-hPa geopotential height field; the other set consists of different height fields of the tropospheric pressure levels and the temperature of the 850-hPa pressure level. For the winter months (December, January, February) two natural coupled modes, a barotropic and a baroclinic one, of linear relationship between stratospheric and tropospheric circulation are found. -from Authors
