pollen data as a "high frequency" climate indicators
In a new study by Helama et al. Reconciling
pollen-stratigraphical and tree-ring evidence for high-and low-frequency temperature variability in the past millennium Monday, December 27, 2010
How Many Bodyguards Do I Need?
(Abstract), on the one hand, the authors conclude that it - not quite unexpectedly - probably in the "high-latitude Regions of Europe a MWP - write politically correct MCA - existed. Second, they lead to evidence that not only tree ring data, but also pollen proxy data to identify "high-frequency variations" in vergangenen Klimata herangezogen werden können.
Hier ein Teilauszug des Abstracts:
Climate change and variability assessments require an understanding of their long-term and period (low-frequency) and short-term and period (high-frequency) variations. Pollen data have conventionally been thought of as a proxy of low-frequency variation of past climates but of more limited applicability for studying high frequencies. Likewise, tree-rings are commonly supposed to reflect faithfully high-frequency variations, with additional uncertainties attributable to variations at lower frequencies. Here we challenge this view in the context of pollen and tree-ring based temperature reconstructions from high-latitude Europe. ...
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