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Journal of Climate
Vol.11, 1529-1537, 1998
© American Meteorological Society
ISSN 0894-8755

The global range of the stratospheric decadal wave, Part I: Its association with the sunspot cycle in summer and in the annual mean, and with the troposphere

H. van Loon* and K. Labitzke +

*Present affilation: National Center for Atmospheric Research,
Boulder, Colorado, CO 80307, U.S.A.
+Meteorologisches Institut, Freie Universität Berlin,
12165 Berlin, Germany


Abstract

We correlate the 23-year series of the re-analyzed 30-hPa heights and temperatures and the 10-hPa heights with the 11-year solar cycle - for the summers of both hemispheres and for the annual mean. The size and spatial pattern of the correlations on the northern hemisphere are the same as those of the correlations computed with a nearly twice as long series from the Freie Universität Berlin: A belt of correlation, which encircles the hemisphere in the outer tropic-subtropics. The correlation pattern is similar on the southern hemisphere.

The spatial distribution of correlations between 30-hPa temperatures and the solar cycle has the same configuration as the height correlation with the cycle. The largest temperature correlations move with the sun from one summer hemisphere to the other.

The first eigenvector in a principal component analysis of the 30-hPa heights in summer and in the annual mean has the same shape as the above mentioned pattern in the correlations between the stratospheric data and the 11-year solar cycle. EOF 1 explains 77% of the variance in summer on the northern and 72% on the southern hemisphere, and the time series of its amplitude is dominated by a decadal wave in phase with the 11-year sunspot cycle.



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