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Robustness of future atmospheric circulation changes over the EURO-CORDEX domain

handle: 11729/3315 , 11250/3137661
AbstractEuropean climate is associated with variability and changes in the mid-latitude atmospheric circulation. In this study, we aim to investigate potential future change in circulation over Europe by using the EURO-CORDEX regional climate projections at 0.11° grid mesh. In particular, we analyze future change in 500-hPa geopotential height (Gph), 500-hPa wind speed and mean sea level pressure (MSLP) addressing different warming levels of 1 °C, 2 °C and 3 °C, respectively. Simple scaling with the global mean temperature change is applied to the regional climate projections for monthly mean 500-hPa Gph and 500-hPa wind speed. Results from the ensemble mean of individual models show a robust increase in 500-hPa Gph and MSLP in winter over Mediterranean and Central Europe, indicating an intensification of anticyclonic circulation. This circulation change emerges robustly in most simulations within the coming decade. There are also enhanced westerlies which transport warm and moist air to the Mediterranean and Central Europe in winter and spring. It is also clear that, models showing different responses to circulation depend very much on the global climate model ensemble member in which they are nested. For all seasons, particularly autumn, the ensemble mean is much more correlated with the end of the century than most of the individual models. In general, the emergence of a scaled pattern appears rather quickly.
- Işık University Turkey
- Bjerknes Centre for Climate Research Norway
- University of Copenhagen Denmark
- NORCE NORWEGIAN RESEARCH CENTRE AS Norway
- Danish Meteorological Institute Denmark
Simulations, CLIMATE-CHANGE PROJECTIONS, Climate-change projections, 551, 333, UNCERTAINTIES, CMIP5 models, Atmospheric circulation, Change signals, Climate change, Lapse-rate, Variability, Patterns, LAPSE-RATE, Regional climate modeling, Uncertainties, SIMULATIONS, VARIABILITY, PATTERNS, EURO-CORDEX, CMIP5 MODELS, CHANGE SIGNALS
Simulations, CLIMATE-CHANGE PROJECTIONS, Climate-change projections, 551, 333, UNCERTAINTIES, CMIP5 models, Atmospheric circulation, Change signals, Climate change, Lapse-rate, Variability, Patterns, LAPSE-RATE, Regional climate modeling, Uncertainties, SIMULATIONS, VARIABILITY, PATTERNS, EURO-CORDEX, CMIP5 MODELS, CHANGE SIGNALS
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