Temperature and precipitation variability in the European Alps since 1500
Corresponding Author
Carlo Casty
Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
Institute of Geography and NCCR Climate, University of Bern, Switzerland
Climate and Environmental Physics, Physics Institute, Sidlerstrasse 5, CH-3012 Bern, SwitzerlandSearch for more papers by this authorHeinz Wanner
Institute of Geography and NCCR Climate, University of Bern, Switzerland
Search for more papers by this authorJürg Luterbacher
Institute of Geography and NCCR Climate, University of Bern, Switzerland
Search for more papers by this authorJan Esper
Swiss Federal Research Institute WSL, CH-8903 Birmensdorf, Switzerland
Search for more papers by this authorReinhard Böhm
ZAMG—Central Institute for Meteorology and Geodynamics, Vienna, Austria
Search for more papers by this authorCorresponding Author
Carlo Casty
Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
Institute of Geography and NCCR Climate, University of Bern, Switzerland
Climate and Environmental Physics, Physics Institute, Sidlerstrasse 5, CH-3012 Bern, SwitzerlandSearch for more papers by this authorHeinz Wanner
Institute of Geography and NCCR Climate, University of Bern, Switzerland
Search for more papers by this authorJürg Luterbacher
Institute of Geography and NCCR Climate, University of Bern, Switzerland
Search for more papers by this authorJan Esper
Swiss Federal Research Institute WSL, CH-8903 Birmensdorf, Switzerland
Search for more papers by this authorReinhard Böhm
ZAMG—Central Institute for Meteorology and Geodynamics, Vienna, Austria
Search for more papers by this authorAbstract
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° × 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 controled Alpine temperature and precipitation variability through the recent past. Copyright © 2005 Royal Meteorological Society
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