EGU2020-16822
https://doi.org/10.5194/egusphere-egu2020-16822
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Dependence of benefits of convection permitting models on large-scale conditions

Danijel Belusic1, Petter Lind1, Oskar Landgren2, Dominic Matte3, Rasmus Anker Pedersen4, Erika Toivonen5, Felicitas Hansen1, and Fuxing Wang1
Danijel Belusic et al.
  • 1Swedish Meteorological and Hydrological Institute, Rossby Centre, Norrkoping, Sweden (danijel.belusic@smhi.se)
  • 2Norwegian Meteorological Institute, Oslo, Norway
  • 3University of Copenhagen, Copenhagen, Denmark
  • 4Danish Meteorological Institute, Copenhagen, Denmark
  • 5Finnish Meteorological Institute, Helsinki, Finland

Current literature strongly indicates large benefits of convection permitting models for subdaily summer precipitation extremes. There has been less insight about other variables, seasons and weather conditions. We examine new climate simulations over the Nordic region, performed with the HCLIM38 regional climate model at both convection permitting and coarser scales, searching for benefits of using convection permitting resolutions. The Nordic climate is influenced by the North Atlantic storm track and characterised by large seasonal contrasts in temperature and precipitation. It is also in rapid change, most notably in the winter season when feedback processes involving retreating snow and ice lead to larger warming than in many other regions. This makes the area an ideal testbed for regional climate models. We explore the effects of higher resolution and better reproduction of convection on various aspects of the climate, such as snow in the mountains, coastal and other thermal circulations, convective storms and precipitation with a special focus on extreme events. We investigate how the benefits of convection permitting models change with different variables and seasons, and also their sensitivity to different circulation regimes.

How to cite: Belusic, D., Lind, P., Landgren, O., Matte, D., Pedersen, R. A., Toivonen, E., Hansen, F., and Wang, F.: Dependence of benefits of convection permitting models on large-scale conditions, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-16822, https://doi.org/10.5194/egusphere-egu2020-16822, 2020