Wednesday, June 6th 2012, 8:44 AM EDT
Based on data from a few carefully selected tree rings, dogmatic warmist scientists like to insist that the Medieval Warm Period really did not exist globally and was only a local North Atlantic phenomenon.
The climate, they tell us, was pretty much steady over the last couple thousand years – until man began to prosper a hundred years ago.
However, yet another new study, one by Michael Shawn Fletcher and Patricio Iván Moreno, has been published and adds more to the growing mountain of evidence that the Medieval Warm Period was indeed a global phenomenon. This in turn means that natural climate drivers are dominating the development of the climate, and not CO2.
Yeah, like we’re really surprised.
The authors did an analysis of pollen and charcoal from Laguna San Pedro, a small closed-basin lake located in the Andes of Chile. Their results reveal centennial-scale changes in vegetation, climate and fire regime since 1500 cal yr before present.
According to the study’s abstract, they found periods of relatively low summer moisture and increased fire activity between 1500–1300 and 1000–725 cal yr BP. The period 1000–725 cal yr BP (i.e. Medieval Warm Period) is characterised by remarkably rapid bulk sediment accumulation, from which they infer prolonged annual sedimentation resulting from a decrease in the duration of lake freezing under a warmer climate. Before the Medieval Warm Period, i.e. 1300–1000, they found relatively moist conditions during summer and low fire activity. After the Medieval Warm Period, from 725–121 cal yr BP, there was slow bulk sediment accumulation implying a cool and wet climate. Adios Hockey Stick!
Click source to read FULL report from P. Gosselin