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Climate of the Past An interactive open-access journal of the European Geosciences Union
https://doi.org/10.5194/cp-2017-137
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
21 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).
Patterns of extreme weather associated with observed and proxy River Ammer flood records
Norel Rimbu1, Monica Ionita1,2, Markus Czymzik3,5, Achim Brauer4, and Gerrit Lohmann1,2 1Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
2MARUM – Center for Marine Environmental Sciences, University of Bremen, Bremen, Germany
3Lund University, Department of Geology, Lund, Sweden
4GFZ German Research Centre for Geosciences, Climate Dynamics and Landscape Evolution, Potsdam, Germany
5Leibniz Institute for Baltic Sea Research (IOW), Marine Geology, Rostock-Warnemünde, Germany
Abstract. We investigate the relationship between the variability in the frequency of River Ammer floods (southern Germany) and temperature/precipitation extremes over Europe using observational River Ammer discharge data back to 1926 and the 5500-year-long flood layer record from varved Lake Ammersee sediments. We show that observed River Ammer flood frequency variability is not only related with local extreme precipitation, but also with large-scale temperature extreme anomalies. Less (more) extreme high temperatures over central and western (northeastern) Europe are recorded during periods of increased River Ammer flood frequency. We argue that changing radiative forcing due to cloudiness anomaly patterns associated with River Ammer floods induce these extreme temperature anomalies. Consistent patterns are obtained using observed discharge and proxy flood layer frequency data. Furthermore, a higher frequency of observed River Ammer floods and flood layers is associated with enhanced blocking activity over northeastern Europe. A blocking high over this region increases the probability of wave breaking and associated heavy precipitation over western Europe. A similar blocking pattern is associated with periods of reduced solar activity. Consequently, solar modulated changes in blocking frequency over northeastern Europe could explain the connection between River Ammer floods and solar activity, as also identified in previous studies. We argue that multi-decadal to millennial flood frequency variations in the Mid- to Late Holocene flood layer record from Lake Ammersee characterizes also the extreme temperatures in northeastern Europe.

Citation: Rimbu, N., Ionita, M., Czymzik, M., Brauer, A., and Lohmann, G.: Patterns of extreme weather associated with observed and proxy River Ammer flood records, Clim. Past Discuss., https://doi.org/10.5194/cp-2017-137, in review, 2017.
Norel Rimbu et al.
Norel Rimbu et al.
Norel Rimbu et al.

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Short summary
Multi-decadal to millennial flood frequency variations in the Mid- to Late Holocene in a flood layer record from Lake Ammersee is strongly related to the occurrence of extreme precipitation and temperatures in the northeastern Europe.
Multi-decadal to millennial flood frequency variations in the Mid- to Late Holocene in a flood...
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