30 Mar 2020
30 Mar 2020
Large scale climate signals of a European oxygen isotope network from tree-rings – predominantly caused by ENSO teleconnections?
- 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
- 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.
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Daniel F. Balting et al.


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RC1: 'Review of Balting et al. ‘Large scale climate signals of a European oxygen isotope network from tree-rings - predominantly caused by ENSO teleconnections?’', Anonymous Referee #1, 05 Aug 2020
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AC1: 'Reply to Reviewer 1', Daniel Balting, 22 Sep 2020
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AC1: 'Reply to Reviewer 1', Daniel Balting, 22 Sep 2020
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RC2: 'Review of Large scale climate signals of a European oxygen isotope network from tree-rings - predominantly caused by ENSO teleconnections?', Anonymous Referee #2, 18 Aug 2020
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AC2: 'Reply to Reviewer 2', Daniel Balting, 22 Sep 2020
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AC2: 'Reply to Reviewer 2', Daniel Balting, 22 Sep 2020


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RC1: 'Review of Balting et al. ‘Large scale climate signals of a European oxygen isotope network from tree-rings - predominantly caused by ENSO teleconnections?’', Anonymous Referee #1, 05 Aug 2020
-
AC1: 'Reply to Reviewer 1', Daniel Balting, 22 Sep 2020
-
AC1: 'Reply to Reviewer 1', Daniel Balting, 22 Sep 2020
-
RC2: 'Review of Large scale climate signals of a European oxygen isotope network from tree-rings - predominantly caused by ENSO teleconnections?', Anonymous Referee #2, 18 Aug 2020
-
AC2: 'Reply to Reviewer 2', Daniel Balting, 22 Sep 2020
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AC2: 'Reply to Reviewer 2', Daniel Balting, 22 Sep 2020
Daniel F. Balting et al.
Daniel F. Balting et al.
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