|TITLE||ATMOSPHERIC DYNAMICS LEADING TO WEST EUROPEAN SUMMER HEATWAVES DURING THE PAST CENTURIES|
|AUTHORS||M. Carmen Alvarez-castro (1), Davide Faranda (1), Pascal Yiou (1)|
- Laboratoire Des Sciences Du Climat Et De L'environnement (lsce) Gif-sur-yvette (France)
|ABSTRACT||The European summer heatwaves have been increasing in frequency and magnitude in the past decades. In western Europe, the recent summers of 2003 and 2015 were exceptionally warm. Many studies have shown that the genesis of the major heat events of the last decades was linked to anticyclonic atmospheric circulation and to spring precipitation deficit in southern Europe. Such results were obtained for the second part of the 20th century and projections into the 21st century.
We challenge this conceptual model by investigating an ensemble of 20CR reanalyses from the last part of the 19th century. We propose an innovative description of west European heat events. We argue that the atmospheric circulation patterns leading to the most intense heat events have changed during the last century. We also compare outputs of the historical experiment from CMIP5 (Coupled Model Intercomparison Project phase 5) with reanalysis datasets (20CR, ERA20C)to assess how models simulate such events.|