Esper, Cook and Schweingruber put together a northern hemisphere temperature reconstruction using tree rings, with particular emphasis on low-frequency signals. They write "we show that the average of these chronologies supports the large-scale occurrence of the MWP over the NH extratropics."Low-Frequency Signals in Long Tree-Ring Chronologies for Reconstructing Past Temperature Variabilityhttp://www.sciencemag.org/content/295/5563/2250DB2
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