The GKSS simulation was forced with unusually large changes in natural radiative forcing in past centuries [the peak - to - peak solar forcing changes on centennial timescales (~ 1 W / m2) were about twice that used in other studies (e.g. Crowley, 2000) and much larger than the most recent estimates (~ 0.15 W / m2 — see Lean et al., 2002; Foukal et al., 2004)-RSB-. (mustelid.blogspot.ru)
Note that the atmospheric signal is smoothed during the pore close - off process, so that sharp fluctuations occurring at sub centennial timescales can not be resolved in Antarctic ice cores. (dotearth.blogs.nytimes.com)
The implications of our findings are that the modern observations of ocean - driven warming along the western Antarctic Peninsula need to be considered as part of a natural centennial timescale cycle of climate variability, and that in order to understand climate change along the Antarctic Peninsula, we need to understand the broader climate connections with the rest of the planet. (dotearth.blogs.nytimes.com)