TU Bergakademie Freiberg , Brennhausgasse 14, 09596 Freiberg, Germany Phone: 0 37 31/39-3533, www.tu-freiberg.de Effects of atmospheric circulation on air temperature in Europe and northern Asia Andreas Hoy, Mait Sepp, Jörg Matschullat [email protected]
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TU Bergakademie Freiberg , Brennhausgasse 14, 09596 Freiberg, Germany
Effects of atmospheric circulation on air temperature in Europe and northern Asia. TU Bergakademie Freiberg , Brennhausgasse 14, 09596 Freiberg, Germany Phone: 0 37 31/39-3533, www.tu-freiberg.de. Andreas Hoy , Mait Sepp, Jörg Matschullat [email protected]. - PowerPoint PPT Presentation
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Outline of Research Context• Large increase of air temperature in Europe and northern Asia
(Siberia) within 1901-2010 – particularly visible in winter, amplified in recent climate normal (1981-2010)
• Regionally diverse warming (cooling) patterns cannot be explained by „global warming“ alone
• Warming in most (European) circulation forms (Jones/Lister 2009) if most of them warm, additional warming should be connected to changes in their distribution
• Objectives:1. To illustrate changes in circulation type frequency2. To investigate the spatial impact of more/less frequent
circulation types on air temperature3. To define regions mostly affected by circulation changes
EMS, 14.09.2012 [email protected] 12Winter 1981-2010 compared to 1901-2010
• Strong warming in Russia/moderate warming in Western and Central Europe in agreement to increasing westerlies (warm)/ decreasing easterlies (cold)
• Regional cooling in Greenland/ eastern Mediterranean connected to rather northerly inflow during westerlies
Conclusions
• Distinct impact of atmospheric circulation on air temperature changes in circulation type frequency naturally lead to changes in average air temperature
• In winter, westerlies largely increased/easterlies largely decreased in European/northern Asian realm
• Besides general warming, frequency shifts agree with large-scale warming pattern in most of northern/central Eurasia
• Regional (weak) cooling fits very well to detected frequency shifts