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@INPROCEEDINGS{PoshyvailoStrube:1022229,
      author       = {Poshyvailo-Strube, Liubov and Wagner, Niklas and Görgen,
                      Klaus and Furusho, Carina and Hartick, Carl and Kollet,
                      Stefan},
      title        = {{G}roundwater in terrestrial systems modelling: a new
                      climatology of extreme heat events in {E}urope},
      reportid     = {FZJ-2024-01350},
      year         = {2023},
      abstract     = {The representation of groundwater processes is simplified
                      in most regional climate models (RCMs), potentially leading
                      to biases in simulated heat waves. We introduce aunique
                      dataset from the regional Terrestrial Systems Modeling
                      Platform (TSMP) forced by the Max Planck Institute Earth
                      System Model with Low Resolution (MPI-ESM-LR)historical
                      boundary conditions in the context of dynamical downscaling
                      of global climate models (GCMs) for climate change studies.
                      TSMP explicitly represents 3Dsubsurface and groundwater
                      hydrodynamics together with overland flow, closing the water
                      and energy cycle from the bedrock to the top of the
                      atmosphere. We perform ananalysis of summer heat events
                      (i.e., a series of consecutive days with a near-surface
                      temperature exceeding the 90th percentile) for the
                      historical time period 1976-2005relative to the reference
                      period 1961-1990 in a TSMP climate change scenario control
                      run. For comparison, the analysis is repeated for an
                      ensemble of GCM-RCMsimulations with simplified groundwater
                      dynamics from the Coordinated Regional Climate Downscaling
                      Experiment for European domain (EURO-CORDEX).Our results
                      show that TSMP simulates the number of heat events
                      consistently with the CORDEX ensemble, although there are
                      systematic differences. Compared to theCORDEX ensemble, TSMP
                      simulates lower mean and interannual variability in the
                      frequency of hot days (i.e., days with a near-surface
                      temperature exceeding the 90thpercentile) on average over
                      Europe. The decadal change in the number of hot days is also
                      lower in TSMP than on average in the CORDEX ensemble. TSMP
                      systematicallysimulates fewer heat waves (i.e., heat events
                      lasting 6 days or more) compared to the CORDEX ensemble,
                      moreover, they are less intense. We find that Southern
                      Europe isparticularly sensitive to groundwater coupling,
                      while Scandinavia is the least sensitive. Therefore, an
                      explicit representation of groundwater may be a key for bias
                      reduction insimulated duration and intensity of heat waves,
                      particularly in Southern Europe. The results emphasise the
                      importance of groundwater coupling in long-term
                      regionalclimate simulations and potential implications for
                      climate change projections. This work is currently under
                      review for the ESD journal.},
      month         = {Sep},
      date          = {2023-09-25},
      organization  = {2nd TERENO-OZCAR Conference, Bonn
                       (Germany), 25 Sep 2023 - 28 Sep 2023},
      subtyp        = {Other},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217) / 2A2 - HI-CAM (CARF - CCA) (POF4-2A2) /
                      ClimXtreme Verbundprojekt Modul C Impacts - Teilprojekt 7:
                      IHAX - Einfluss der anthropogene Wassernutzung auf
                      Extremereignisse in regionalen Klimasimulationen
                      (01LP1903G)},
      pid          = {G:(DE-HGF)POF4-2173 / G:(DE-HGF)POF4-2A2 /
                      G:(BMBF)01LP1903G},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1022229},
}