EGU2020-9167
https://doi.org/10.5194/egusphere-egu2020-9167
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Future response of precipitation extremes over the Nordic region in a convection-permitting regional climate model

Petter Lind1, Danijel Belušić1, Erik Kjellström1, Fuxing Wang1, Erika Toivonen2, Rasmus A. Pedersen3, Dominic Matte4, and Andreas Dobler5
Petter Lind et al.
  • 1Swedish Meteorological and Hydrological Institute, Norrköping, Sweden (petter.lind@smhi.se)
  • 2Finnish Meteorological Institute, Helsinki, Finland
  • 3Danish Meteorological Institute, Copenhagen, Denmark
  • 4Niels Bohr Institute, Copenhagen, Denmark
  • 5MET Norway, Oslo, Norway

There is an increased need for more detailed climate information from impact researchers, stakeholders and policy makers for regional-to-local climate change assessments. In order to design relevant and informative planning strategies on these scales it is important to have reliable climate data and information on high spatial O(1km) and temporal (daily to sub-daily) scales. Such high-resolution data is also beneficial for climate impact modellers as input to their models, e.g. hydrological or urban models that operate on regional to local scales. It has been established that regional climate models (RCMs) provide added value compared to coarser global climate models (GCMs) or re-analysis (e.g. ERA-Interim). However, RCMs with standard spatial resolution O(10 − 50km) still suffer from inadequacies in representing important regional-to-local climate phenomena and characteristics, both from the implied ”smoothening” effect within each grid cell which limits the representation of fine scale surface forcings, and the need to parameterize small-scale processes like atmospheric convection. The latter particularly invokes uncertainties in future climate responses of short-duration precipitation extremes such as flash-floods. Here, we compare 20-year simulations with a very high resolution (3 km grid spacing) convection permitting regional climate model (CPRCM) with a standard high-resolution (12 km grid spacing) convection parameterized RCM and their abilities to simulate the climate characteristics of the Nordic region in Europe, with particular focus on precipitation extremes. The study covers both recent past (with boundary data from ERA-Interim and the EC-Earth GCM) and the end of the 21st century (boundary data from EC-Earth using the RCP8.5 radiative forcing scenario). The high model grid resolution combined with the extensive simulated time period which enables assessment on climatological time scales makes this study one of very few for this region.

How to cite: Lind, P., Belušić, D., Kjellström, E., Wang, F., Toivonen, E., Pedersen, R. A., Matte, D., and Dobler, A.: Future response of precipitation extremes over the Nordic region in a convection-permitting regional climate model, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-9167, https://doi.org/10.5194/egusphere-egu2020-9167, 2020

This abstract will not be presented.