Where do we stand in the past 4Ka of climate?
Figure 1 shows the reconstruction of the GISP2 temperature record for the past 4000 years using only a 3-period analytical model (here, they found optimal periods to be at 2804-year, 1186-year and 556-year). The model is somewhat successful in replicating the observed temperature in that it explains over 63% of the changes in the hind-casting period. In order to add scientific weight to their results, the authors also surveyed and extensively discussed the nature of the natural recurrent periods to known cyclical variations of Earth-Moon orbits, as well as to some of the known variations of solar magnetic activity and related solar outputs
Figure 1 shows the reconstruction of the GISP2 temperature record for the past 4000 years using only a 3-period analytical model (here, they found optimal periods to be at 2804-year, 1186-year and 556-year). The model is somewhat successful in replicating the observed temperature in that it explains over 63% of the changes in the hind-casting period. In order to add scientific weight to their results, the authors also surveyed and extensively discussed the nature of the natural recurrent periods to known cyclical variations of Earth-Moon orbits, as well as to some of the known variations of solar magnetic activity and related solar outputs