EGU2020-12319, updated on 12 Jun 2020
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

High-resolution isotopic simulations from ECHAM6-wiso nudged with ERA5 reanalyses: new products for isotopic model-data comparisons

Alexandre Cauquoin1,2 and Martin Werner2
Alexandre Cauquoin and Martin Werner
  • 1Institute of Industrial Science (IIS), The University of Tokyo, Chiba, Japan (
  • 2Alfred Wegener Institute (AWI), Paleoclimate Dynamics, Bremerhaven, Germany

For several decades, the comparison of climate data with results from water isotope-enabled Atmosphere General Circulation Models (AGCMs) significantly helped to a better understanding of the processes ruling the water cycle, which is one of the main drivers of the climate variability. For the modern period, the use of AGCMs nudged with weather forecasts reanalyses is a powerful way to obtain model outputs under the same weather conditions than at the sampling time of the observations.

Here we present new isotopic simulations results from ECHAM6-wiso [1] nudged with the last reanalyses dataset from the European Centre for Medium-Range Weather Forecasts (ECMWF), ERA5 [2], at different spatial resolutions over the period 1979-2018. Model results are evaluated against isotopic data compilations, including GNIP (Global Network of Isotopes in Precipitation [3]), speleothems [4], ice cores datasets and water vapor measurements. To quantify the impact of these reanalyses on our simulations, we also performed nudged simulations with the previous model version ECHAM5-wiso [5] by using ERA5 data and its predecessor ERA-Interim [6].

These new simulation products could be a useful contribution to the isotopic data community for the interpretation of their water isotope records and for the exploration of the mechanisms controlling the variability of the surrounding water isotopic composition.


[1] Cauquoin et al., Clim. Past, 15, 1913–1937,, 2019.

[2] Copernicus Climate Change Service (C3S), 2017.

[3] IAEA, the GNIP Database, available at:

[4] Comas-Bru et al., Clim. Past, 15, 1557–1579,, 2019.

[5] Werner et al., Geosci. Model Dev., 9, 647–670,, 2016.

[6] Dee et al., Q. J. R. Meteorol. Soc., 137, 553–597,, 2011.

How to cite: Cauquoin, A. and Werner, M.: High-resolution isotopic simulations from ECHAM6-wiso nudged with ERA5 reanalyses: new products for isotopic model-data comparisons, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12319,, 2020


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