Current IPCC assessments of the future climate are mainly based on simulations of rather coarse-resolution global climate models. To assess climate changes at a regional scale requires use of higher-resolution climate models downscaling results of global models.

SEEVCCC, having a key objective to study how the climate over Eastern Europe and surrounding areas will change over the multi-decadal periods, is developing a new Regional Earth Modelling System (SEEVCCC REMS). REMS will be composed of the following key sub-models:

• atmospheric NCEP/NMMB model
• ocean model
• aerosol (incl. mineral dust, sea-salt, biomass burning) DREAM model
• hydrology HYPROM model

REMS will be designed to provide components of the Earth system (sub-models) to interact through different feedback mechanisms. In REMS, NMMB is a major driver of other sub-model components. The sub-models represent callable routines in NMMB, i.e. one time step of the atmospheric driver is followed by time steps of the sub-model components. Whenever possible and feasible, two-way interaction rather than one-way forcing between modelling components of the system will be developed.

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