Naslov
The impact of boundary forcing on RegCM4.2 surface energy budget

Autori
Güttler, Ivan ; Branković, Čedo ; Srnec, Lidija ; Patarčić, Mirta.

Izvornik
Climatic change (0165-0009) 125 (2014), 1; 67-78

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
surface energy budget; model errors; RegCM; GEWEX/SRB; ERA-Interim; HadGEM2-ES

Sažetak
The surface energy budget components from two simulations of the regional climate model RegCM4.2 over the European/north African domain during the period 1989-2005 are analysed. The simulations differ in specified boundary forcings which were obtained from ERA-Interim reanalysis and the HadGEM2-ES Earth system model. Surface radiative and turbulent fluxes are compared against ERA-Interim. Errors in surface radiative fluxes are derived with respect to the GEWEX/SRB satellite-based products. In both space and time, we find a high degree of realism in the RegCM surface energy budget components, but some substantial errors and differences between the two simulations are also present. The most prominent error is an overestimation of the net surface shortwave radiation flux of more than 50 W/m2 over central and southeastern Europe during summer months. This error strongly correlates with errors in the representation of total cloud cover, and less strongly with errors in surface albedo. During other seasons the amplitude of the surface energy budget components is more in line with reference datasets. The errors may limit the usefulness of RegCM simulations in applications (e.g. high-quality simulation-driven impact studies). However, by using a simple diagnostic model for error interpretation we suggest potential sensitivity studies aiming to reduce the underestimation of cloud cover and overestimation of shortwave radiation flux.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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