| Details1: | ...
What was done
In an attempt to gain that understanding, Qian and Lu began with the reconstructed global-mean temperature anomaly history of Mann et al. (2008), combined with HadCRUT3 data for 1000-2008, relative to 1961-1990 (Brohan et al., 2006); and after removing the mean temperatures of the Medieval Warm Period (MWP), the Little Ice Age (LIA) and what they denoted the Global Warming Period (GWP), they used a wavelet transform procedure to identify four oscillations in the millennial temperature time series with periods of 21.1, 62.5, 116.0 and 194.6 years. Next, they similarly examined a reconstructed 400-year solar radiation series based on 10Be data (Lean et al., 1995; Bard and Frank, 2006), using the results they obtained "to analyze their causality relationship" with the periodic oscillations they had detected in the reconstructed millennial global-mean temperature series.
... |
