P1.29

Downscaling of Era40 in Mountainous Terrain

Idar Barstad, Bjerknes Centre for Climate Research and Univ. of Bergen, Bergen, Norway; and A. Sorteberg, F. Flatoy, and M. Deque

A novel downscaling approach of the Era40 data set has been taken and results for comparison with observations in Norway will be presented. The method applies a nudging technique in a stretched global model, focused in the Norwegian Sea (67N, 5W). The effective resolution is three times the one of the Era40, equivalent to about 30km grid spacing in the area of focus. Longer waves (The comparison to observations incorporate numerous station data points of i) precipitation (#357), ii) temperature (#98) and iii) wind (#10), and the downscaled data set shows large improvements over Era40. The daily precipitation show considerably reduction in bias (from 50% to 11%), and a two-fold reduction at 99.9%tile (-59% to 29%). The daily temperature showed a bias reduction of about a degree in most areas, and relative large RMSE reduction (from 7.5 to 5.0 except winter). The wind comparison showed a slight improvement in bias, and significant improvements in RMSE.

  Extended Abstract (800K)

Poster Session 1, Ice Breaker Reception with Mountain Meteorology Poster Session 1
Monday, 11 August 2008, 5:30 PM-7:00 PM, Sea to Sky Ballroom A

Previous paper  Next paper

Browse or search entire meeting

AMS Home Page