NOAA Paleoclimatology Program - Casty et al. 2005 European Alps Temperature and Precipitation Reconstructions

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Temperature and Precipitation Variability in the European Alps Since 1500.

	Temperature and Precipitation Variability in the European Alps Since 1500. International Journal of Climatology Volume 25, Issue 14, pp. 1855-1880, 30 November 2005 Carlo Casty^1,2, Heinz Wanner², Jürg Luterbacher², Jan Esper³, Reinhard Böhm⁴ ¹ Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland ² Institute of Geography and NCCR Climate, University of Bern, Switzerland ³ Swiss Federal Research Institute WSL, CH-8903 Birmensdorf, Switzerland ⁴ ZAMG - Central Institute for Meteorology and Geodynamics, Vienna, Austria
ABSTRACT: High-resolution temperature and precipitation variations and their seasonal extremes since 1500 are presented for the European Alps (43.25-48.25 °N and 4.25-16.25 °E). The spatial resolution of the gridded reconstruction is given by 0.5° x 0.5° and monthly (seasonal) grids are reconstructed back to 1659 (1500-1658). The reconstructions are based on a combination of long instrumental station data and documentary proxy evidence applying principal component regression analysis. Annual, winter and summer Alpine temperatures indicate a transition from cold conditions prior to 1900 to present day warmth. Very harsh winters occurred at the turn of the seventeenth century. Warm summers were recorded around 1550, during the second half of the eighteenth century and towards the end of the twentieth century. The years 1994, 2000, 2002, and particularly 2003 were the warmest since 1500. Unlike temperature, precipitation variation over the European Alps showed no significant low-frequency trend and increased uncertainty back to 1500. The years 1540, 1921 and 2003 were very likely the driest in the context of the last 500 years. Running correlations between the North Atlantic Oscillation Index (NAOI) and the Alpine temperature and precipitation reconstructions demonstrate the importance of this mode in explaining Alpine winter climate over the last centuries. Winter NAOI correlates positively with Alpine temperatures and negatively with precipitation. These correlations, however, are temporally unstable. We conclude that the Alps are situated in a band of varying influence of the NAO, and that other atmospheric circulation modes controlled Alpine temperature and precipitation variability through the recent past.

Download data from the WDC Paleo archive: European Alps Temperature and Precipitation Reconstructions Data Description Griddded temperature, seasonal (1 MB file) Griddded temperature, monthly (6 MB file) Griddded precipitation, seasonal (1 MB file) Griddded precipitation, monthly (6 MB file)
To read or view the full study, please visit the Wiley website. It was published in International Journal of Climatology , Volume 25, Issue 14, pp. 1855-1880, 30 November 2005.


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