The 11-Year Solar Cycle In The Lower

We apply a novel method to extract the solar cycle signal from the atmospheric data in the lower stratosphere and troposphere. An alternative to traditional analysis is a nonlinear EMD (empirical mode decomposition) method. This method is adaptive and therefore highly ecient at identifying embedded structures, even those with small amplitudes. Using this analysis, the geopotential height in the Northern Hemisphere can be completely decomposed into ve non-stationary temporal modes including an annual cycle, a QBO signal, an ENSO-like mode, a solar cycle signal and a trend. High correlations with the sunspot cycle unambiguously establish that the fourth mode is an 11-year solar cycle signal