Quantitative estimates of temperature and precipitation changes over the last millennium from pollen and lake-level data at Lake Joux, Swiss Jura Mountains |
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| Authors: | Michel Magny Odile Peyron Boris Vannière Bruno Vermot-Desroches |
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| Institution: | a CNRS-UMR 6249, Laboratoire Chrono-Environnement, UFR des Sciences et Techniques, 16 route de Gray, 25 030 Besançon, Franceb Météo-France, 36 Avenue de l'Observatoire, 25030 Besançon, France |
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| Abstract: | This paper presents quantitative climate estimates for the last millennium, using a multi-proxy approach with pollen and lake-level data from Lake Joux (Swiss Jura Mountains). The climate reconstruction, based on the Modern Analogue Technique, indicates warmer and drier conditions during the Medieval Warm Period (MWP). MWP was preceded by a short-lived cold humid event around AD 1060, and followed by a rapid return around AD 1400 to cooler and wetter conditions which generally characterize the Little Ice Age (LIA). Around AD 1450 (solar Spörer minimum), the LIA attained a temperature minimum and a summer precipitation maximum. The solar Maunder minimum around AD 1690 corresponded at Joux to rather mild temperatures but maximal annual precipitation. These results generally agree with other records from neighbouring Alpine regions. However, there are differences in the timing of the LIA temperature minimum depending on the proxy and/or the method used for the reconstruction. As a working hypothesis, the hydrological signal associated with the MWP and LIA oscillations at Lake Joux may have been mainly driven by a shift around AD 1400 from positive to negative NAO modes in response to variations in solar irradiance possibly coupled with changes in the Atlantic meridional overturning circulation. |
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| Keywords: | West-central Europe Last millennium MWP LIA Precipitation Temperature Modern Analogue Technique NAO Solar forcing |
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