Sentences with phrase «significant volcanic signal»
All reconstructions show a highly significant volcanic signal, and all but Moberg et al. (which ends in 1925) show a detectable greenhouse gas signal at the 5 % significance level.
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Results from wavelet analysis and SEA reveal significant periodicities near the solar DeVries frequency in the volcanic and residual «volcano free» contributions during the LIA, making a clear separation of the solar and volcanic forcing signals difficult.