Validation of High-resolution Climate Simulations over Northern Europe.

HR: 1340h
AN: A13B-0908 [Abstracts]
TI: Validation of High-resolution Climate Simulations over Northern Europe.
AU: * Muna, R A
EM: muna@iarc.uaf.edu
AF: Nils Gunnar Kvamsto, Office room: 319, O-floyen Geofysisk Institutt,AllＨaten 70, Bergen, 5007 Norway
AU: * Muna, R A
EM: muna@iarc.uaf.edu
AF: Vladimir Alexeev, International Arctic Research Center 930 Koyukuk Drive P.O. Box 757340, Fairbanks, AK 99775 United States
AB: Two AMIP2-type (Gates 1992) experiments have been performed with climate versions of ARPEGE/IFS model examine for North Atlantic North Europe, and Norwegian region and analyzed the effect of increasing resolution on the simulated biases. The ECMWF reanalysis or ERA-15 has been used to validate the simulations. Each of the simulations is an integration of the period 1979 to 1996. The global simulations used observed monthly mean sea surface temperatures (SST) as lower boundary condition. All aspects but the horizontal resolutions are similar in the two simulations. The first simulation has a uniform horizontal resolution of T63L. The second one has a variable resolution (T106Lc3) with the highest resolution in the Norwegian Sea. Both simulations have 31 vertical layers in the same locations. For each simulation the results were divided into two seasons: winter (DJF) and summer (JJA). The parameters investigated were mean sea level pressure, geopotential and temperature at 850 hPa and 500 hPa. To find out the causes of temperature bias during summer, latent and sensible heat flux, total cloud cover and total precipitation were analyzed. The high-resolution simulation exhibits more or less realistic climate over Nordic, Artic and European region. The overall performance of the simulations shows improvements of generally all fields investigated with increasing resolution over the target area both in winter (DJF) and summer (JJA).
DE: 1626 Global climate models (3337, 4928)
DE: 3337 Global climate models (1626, 4928)
DE: 4928 Global climate models (1626, 3337)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005