Highly variable Northern Hemisphere temperatures reconstructed from low- and high-resolution proxy data

Anders Moberg (), Dmitry M. Sonechkin, Karin Holmgren, Nina M. Datsenko and Wibjörn Karlén
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Anders Moberg: Stockholm University
Dmitry M. Sonechkin: Hydrometeorological Research Centre of Russia
Karin Holmgren: Stockholm University
Nina M. Datsenko: Hydrometeorological Research Centre of Russia
Wibjörn Karlén: Stockholm University

Nature, 2005, vol. 433, issue 7026, 613-617

Abstract: Palaeoclimate: tracking the trend A 2,000-year reconstruction of annual temperature for the Northern Hemisphere breaks new ground in the way it combines data from climate proxies with different inherent time scales — such as lake and ocean sediment and tree-ring data — to give full weight to each proxy at its optimum resolution. This technique, using wavelet transformation, makes the most of the available palaeoclimate data. The resulting reconstruction supports the case that multicentennial natural variability has been larger than is commonly thought, and that considerable natural climate variation can be expected in future. High temperatures occurred during the tenth century and notable ‘lows’ around 1600. But post-1990 temperatures stand out still as higher than at any time in the previous 2,000 years.

Date: 2005
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DOI: 10.1038/nature03265

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