engleski

Evaluating RegCM4 surface climatology over the Mediterranean

Regional climate model RegCM4 is forced by ERA-Interim reanalysis over Europe and Mediterranean region for the period 1989-2008 in two experiments differing in horizontal resolution: 50 km and 12.5 km experiments. Model climatology is evaluated using following observational datasets: (1) CRU TS 3.0 and E-OBS 7.0 near-surface air temperature T2m and total precipitation R over land ; (2) CM SAF CLARA-A1 global satellite-based net surface shortwave radiation SWR, net surface longwave radiation LWR, total cloud cover CLD and surface albedo ALB ; (3) HOAPS 3.2 satellite-based total precipitation R, sensible and latent heat flux over ocean (SHF and LHF) and (4) ESA ECV soil moisture SMR satellite-based product. Using comprehensive set of ground- and satellite- based datasets, RegCM4 systematic errors are derived and reduction of systematic errors in the 12.5 km resolution experiment is found. For example, large summer warm bias in 50-km run is substantially reduced in the 12.5-km run and is accompanied with and increase in the CLD and decrease in the SWR in the 12.5-km run in summer months.

regional climate model; Mediterranean

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