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@INPROCEEDINGS{PoshyvailoStrube:905404,
      author       = {Poshyvailo-Strube, Liubov and Wagner, Niklas and Görgen,
                      Klaus and Furusho, Carina and Hartick, Carl and Kollet,
                      Stefan},
      title        = {{G}roundwater {E}ffects on {T}errestrial {S}ystems in
                      {E}urope: {E}volution of {P}ast {H}eatwaves},
      reportid     = {FZJ-2022-00656},
      year         = {2021},
      abstract     = {Due to climate change, hot years in Europe (EU) will likely
                      happen more often, causing frequent hydroclimatic extreme
                      events (e.g., heavy precipitation, droughts, heatwaves) with
                      multiple socio-economic impacts. Consistent climate data is
                      needed for strategies on climate change mitigation and
                      adaptation, but high-resolution hydroclimatic data at
                      EU-scale is still lacking. Moreover, in most climate models,
                      the groundwater (GW) representation and interaction with the
                      atmosphere is generally simplified or missing, leading to
                      biases in simulation of the extreme heat events.We
                      investigate heat events evolution in EU from 1976 to 2005,
                      based on an ensemble of regional climate models (RCMs)
                      forced by global climate models. The ensemble is
                      complemented with Terrestrial Systems Modelling Platform
                      (TSMP) simulations, where full 3D soil and GW dynamics are
                      explicitly represented, closing the terrestrial water cycle
                      from the GW across the land surface into the atmosphere.
                      From the comparison of TSMP and other RCMs lacking GW, we
                      assess the effects of GW on the evolution of EU heatwaves by
                      analysing their main characteristics such as frequency,
                      duration and intensity.Our results show that heat events are
                      differently impacted by GW, depending on the time span and
                      region. Moreover, GW does not have explicit effects on the
                      hot (air temperature exceeds the 90th percentile) days
                      frequency. Hence we found out that GW affects the duration
                      of heat events by decreasing the mean number of hot day
                      events with a duration longer than 3 days. The mean number
                      of long hot events (duration > 6 days) is decreased by a
                      factor of 1.5-2.3. Also, there is an increase in the mean
                      number of short hot events (duration < 3 days).
                      Interestingly, the amplitude (intensity) of heatwaves (heat
                      events exceeding 6 consecutive days) is affected by GW too
                      — the frequency of heatwaves with an amplitude larger than
                      4°C, in comparison to the 90th temperature percentile, is
                      decreased by a factor of 2 and more, while, the frequency of
                      heatwaves with low amplitudes is increased. As conclusion,
                      GW smooths out the heatwaves effect on terrestrial systems
                      in EU.The results emphasize the importance of GW in RCMs,
                      and its impact on heatwaves evolution. Further, this study
                      will be extended to investigate the future evolution of
                      heatwaves based on different climate change scenarios.},
      month         = {Dec},
      date          = {2021-12-13},
      organization  = {AGU Fall Meeting 2021, New Orleans, LA
                       (online) (USA), 13 Dec 2021 - 17 Dec
                       2021},
      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)},
      pid          = {G:(DE-HGF)POF4-2173 / G:(DE-HGF)POF4-2A2},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/905404},
}