12- 1The University of Tokyo, Institute of Industrial Science (IIS), Yoshimura Lab, Kashiwa, Japan (cauquoin@iis.u-tokyo.ac.jp)
- 2Alfred Wegener Institute (AWI), Helmholtz Centre for Polar and Marine Sciences, 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.
In this regard, Cauquoin and Werner (2021) [1] produced a simulation at T127 horizontal resolution (~0.9°) with the ECHAM6-wiso model nudged to the ERA5 reanalyses [2, 3] for the period from 1979 to present time. The simulation results have been used extensively in many studies focusing on, for example, snow-vapor interactions in polar regions, processes controlling isotopic content of water vapor and precipitation in the Asian monsoon area, or the use of isotope information to reconstruct past cyclone frequency.
To go further and considering that one limitation for isotope model-data comparisons is the spatial resolution, we present here new ECHAM6-wiso nudged simulation at 0.5° horizontal resolution for the extended period 1940-2024. This higher resolution will be very useful to improve the interpretation of various water isotope records. Also, the extended data period from 1950 to present time is an opportunity to enhance statistical analyses related to interannual changes in isotopes and climate under global warming. An example of application (EGU26-12139) is presented in the same session as the present abstract.
[1] Cauquoin and Werner (2021). Journal of Advances in Modeling Earth Systems, https://doi.org/10.1029/2021MS002532.
[2] Hersbach al. (2020). Quarterly Journal of the Royal Meteorological Society, https://doi.org/10.1002/qj.3803.
[3] Soci et al. (2024). Quarterly Journal of the Royal Meteorological Society, https://doi.org/10.1002/qj.4803.
How to cite: Cauquoin, A. and Werner, M.: Very high-resolution simulation with ECHAM6-wiso nudged to ERA5 reanalyses for the period 1940-2024, EGU General Assembly 2026, Vienna, Austria, 3–8 May 2026, EGU26-15201, https://doi.org/10.5194/egusphere-egu26-15201, 2026.
