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2020 Changes in North Atlantic atmospheric circulation in a warmer climate favor winter flooding and summer drought over Europe
https://journals.ametsoc.org/view/journals/clim/aop/JCLI-D-20-0311.1/JCLI-D-20-0311.1.xml
Our paper “Changes in North Atlantic atmospheric circulation in a warmer climate favor winter flooding and summer drought over Europe” is now released online in Journal of Climate:
We used a very high resolution climate model (GFDL CM2.6: gfdl.noaa.gov/cm2-6/) to assess changes in atmospheric circulation patterns under an experiment of increasing carbon dioxide concentrations
The high resolution of the model allows for mesoscale oceanic eddies to be resolved and it has a realistic representation of the AMOC. This is important for the ocean-atmosphere interactions that play a significant role in forming the dominant atmospheric circulation patterns
...
we find robust changes in certain atmospheric circulation patterns over the North Atlantic
In winter (and particularly in February), zonal regimes (NAO+ like) are increasing by ~30% in frequency in the 2xCO2. In summer (and particularly in August), Atlantic Ridge, a high-pressure system off the UK coast, is increasing by ~60%
Those robust changes in a warmer world may have great implications for European climate. In winter the increase of zonal circulation is linked to increased rainfall over northwestern Europe, increasing the risk of flooding in the area
In summer, the increase of the AR is linked to less precipitation and longer dry spells over western and central Europe, contributing to higher drought risk. Those dynamical changes act supplementary to the thermodynamic effects of a warming world, exacerbating the impacts