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Impact of observed North Atlantic multidecadal variations to European summer climate: a linear baroclinic response to surface heating

MPS-Authors
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Ghosh,  Rohit
Decadal Climate Predictions - MiKlip, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;
IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society;

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Müller,  Wolfgang A.
Decadal Climate Predictions - MiKlip, The Ocean in the Earth System, MPI for Meteorology, Max Planck Society;

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Bader,  Juergen
Director’s Research Group LES, The Land in the Earth System, MPI for Meteorology, Max Planck Society;

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art%3A10.1007%2Fs00382-016-3283-4.pdf
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Citation

Ghosh, R., Müller, W. A., Baehr, J., & Bader, J. (2017). Impact of observed North Atlantic multidecadal variations to European summer climate: a linear baroclinic response to surface heating. Climate Dynamics, 38, 3547-3563. doi:10.1007/s00382-016-3283-4.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002B-44E2-8
Abstract
The observed prominent multidecadal variations in the central to eastern (C--E) European summer temperature are closely related to the Atlantic multidecadal variability (AMV). Using the Twentieth Century Reanalysis project version 2 data for the period of 1930--2012, we present a mechanism by which the multidecadal variations in the C--E European summer temperature are associated to a linear baroclinic atmospheric response to the AMV-related surface heat flux. Our results suggest that over the north-western Atlantic, the positive heat flux anomaly triggers a surface baroclinic pressure response to diabatic heating with a negative surface pressure anomaly to the east of the heat source. Further downstream, this response induces an east-west wave-like pressure anomaly. The east-west wave-like response in the sea level pressure structure, to which we refer as North-Atlantic-European East West (NEW) mode, is independent of the summer North Atlantic Oscillation and is the principal mode of variations during summer over the Euro-Atlantic region at multidecadal time scales. The NEW mode causes warming of the C--E European region by creating an atmospheric blocking-like situation. Our findings also suggest that this NEW mode is responsible for the multidecadal variations in precipitation over the British Isles and north-western Europe.