P36 The sensitivity of changes in SST for extreme precipitation events on the west coast of Norway

Sandvik, Mari Ingeborg, and Asgeir Sorteberg, University of Bergen, Norway

Weather Research and Forecast (WRF) model has been used on 27 extreme

precipitation events located on the west coast of Norway between 1980-2011. The goal of the study is to see how sensitive the intensity and distribution of the

precipitation for these case studies are to a warmer/colder Atlantic Ocean, with a

uniform change of ±2°C. To secure that the large-scale system remains the same

when the Sea Surface Temperature (SST) is changed, spectral nudging is introduced. To be able to avoid the need of a convective scheme, and the uncertainties it brings, a nested domain with a 2km grid resolution is used over Southern Norway. As a result the model is underestimating the daily precipitation compared to overestimating with the use of a convection scheme. The case studies are then divided into 3 clusters depending on how the wind comes into the coast. The reason for this is to be able to search for patterns within each of the clusters.