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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/cp-2020-39
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2020-39
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Mar 2020

30 Mar 2020

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This preprint is currently under review for the journal CP.

Large scale climate signals of a European oxygen isotope network from tree-rings – predominantly caused by ENSO teleconnections?

Daniel F. Balting1, Monica Ionita1, Martin Wegmann1, Gerhard Helle2, Gerhard H. Schleser3, Norel Rimbu1, Mandy B. Freund4,5, Ingo Heinrich2,6, Diana Caldarescu1, and Gerrit Lohmann1,7 Daniel F. Balting et al.
  • 1Alfred Wegener Institute, Bremerhaven, 27570, Germany
  • 2German Research Centre for Geosciences, Potsdam, 14473, Germany
  • 3IBG-3, Forschungszentrum Jülich, 52428, Germany
  • 4Climate and Energy College, University of Melbourne, Melbourne, 3010, Australia
  • 5CSIRO Agriculture and Food, Melbourne, Australia
  • 6Geography Department, Humboldt University, Berlin, 10099, Germany
  • 7Physics Department, University of Bremen, Bremen, 28359, Germany

Abstract. We investigate the annual variability of δ18O tree ring records from sites distributed all over Europe covering the last 400 years. An Empirical Orthogonal Function (EOF) analysis reveals two distinct modes of variability on the basis of the existing δ18O tree ring records. The first mode of δ18O variability is associated with anomaly patterns of the El Niño-Southern Oscillation (ENSO) and reflects a multi-seasonal climatic signal. The ENSO signal is visible for the last 130 years, but is found weak during the period 1600 to 1850 suggesting that the relationship between ENSO and the European climate may not stable over time. The second mode of δ18O variability, which captures an out-of-phase variability between northwestern and southeastern European δ18O tree ring records, is related to a regional summer atmospheric circulation pattern revealing a pronounced centre over the North Sea. Locally, the δ18O anomalies associated with this mode show the same (opposite) sign with temperature (precipitation). We infer that the investigation of large-scale atmospheric circulation patterns and related teleconnections far beyond instrumental records can be done with oxygen isotopic signature derived from tree rings. However, the European δ18Ocel tree network needs to be consolidated and updated, as well as additional research on the stationarity of reconstructed climate signals and the stationarity of teleconnections is advisable.

Daniel F. Balting et al.

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Daniel F. Balting et al.

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Latest update: 28 Oct 2020
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Short summary
To extend climate information back in time, we investigate the climate sensitivity of a δ18O network from tree rings, consisting of 26 European sites and covering the last 400years. Our results suggest that the δ18O variability is associated with large scale anomaly patterns which resemble to ones observed for the El Niño-Southern Oscillation. We conclude that the investigation of large-scale climate signals far beyond instrumental records can be done with a δ18O network derived from tree rings.
To extend climate information back in time, we investigate the climate sensitivity of a δ18O...
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