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First published May 2005

Last-millennium summer-temperature variations in western Europe based on proxy data

J. Guiot, A. Nicault, C. Rathgeber, J. L. Edouard, F. Guibal, G. Pichard, and C. TillView all authors and affiliations
Volume 15, Issue 4
https://doi.org/10.1191/0959683605hl819rp

Abstract

We present a method of multiproxy reconstruction of the climate of Europe during the last millennium. The proxies used comprise long tree-ring width series, grape harvest dates, Greenland ice oxygen isotope series and temperature indices based on historical documents. The proxies are calibrated using gridded April to September mean temperatures for western Europe, i.e., between 10°W and 20°E and between 35°N and 55°N. They are calibrated also using the long instrumental summer temperature series of the Marseilles observatory of Longchamp, which begins in the mid-eighteenth century. The method is a combination of an analogue technique, which is able to deal with missing data, an artificial neural network technique for an optimal non-linear calibration and a bootstrap technique for calculating error bars on the reconstruction. About 70% of the temperature variance is reconstructed. The amplitude of the past temperature variations is particularly well reconstructed, which is important when considering whether the recent temperature trend is or is not within the natural variability It appears that the temperature of the last decade of the twentieth century was reached only 14 times during the last millennium. The reconstruction is discussed with respect to other multiproxy and borehole temperature reconstructions. We conclude that a reconstruction such ours, with a specific regional focus (as opposed to the larger Northern Hemisphere) is more reliable and is in better agreement with borehole results, even allowing for the fact that only a part of the long-term variance is reconstructed. ‘Little Ice Age’ (c. AD 1560-1930) summers were 0.2±0.5°C cooler than the 1961-1990 period. Borehole temperatures indicate a cooling of 0.4°C which falls in the 95% confidence interval of our reconstructions.

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Published In

Volume 15, Issue 4
Pages: 489 - 500
Article first published: May 2005
Issue published: May 2005

Keywords

  1. Dendroclimatology
  2. climatic change
  3. climate reconstruction
  4. multiproxy reconstruction
  5. ‘Little Ice Age’
  6. western Europe

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J. Guiot
CEREGE CNRS Université Paul Cézanne UMR 6635, Europô le méditerranéen de lĺArbois BP 80, F-13545 Aix-en-Provence cedex 4, France
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A. Nicault
CEREGE CNRS Université Paul Cézanne UMR 6635, Europô le méditerranéen de lĺArbois BP 80, F-13545 Aix-en-Provence cedex 4, France
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C. Rathgeber
Climate Research Unit, University of East Anglia, Norwich NR47T9, UK
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F. Guibal
IMEP CNRS Université Paul Cézanne UMR 6336, bâtiment Villemin, Domaine du Petit Arbois, avenue Louis Philibert, F-13290 Aix-les-Milles, France
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G. Pichard
11 avenue du Parc Borely, 13008 Marseille, France
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C. Till
48 rue de la Neuville, B-1348 Louvain-la-Neuve, Belgium
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