Regional Earth System Modeling
A number of regional climate model (RCM) systems have been developed during the last two decades in order to downscale the output from large scale global climate model simulations and produce fine scale regional climate change information useful for impact assessment and adaptation studies (e.g. Giorgi 2006a).
To date most RCMs have been essentially composed by an atmospheric component coupled to a land surface scheme and driven over ocean areas by prescribed sea surface temperature (SST). Although such a RCM can be sufficient for many applications, there are cases in which the fine scale feedbacks associated with air-sea interactions can substantially influence the spatial and temporal structure of regional climates.
The development of a Regional Earth System Model has been one of the main objective of the Regional climate variability research area of ENEA. Our main focus is the Mediterranean climate variability, together with the simulations of the African climate.
- Modelling the Mediterranean coupled system
- Mediterranean ocean variability
- Land-surface atmosphere interaction
- River modeling
- Impact modeling
- African climate
Modelling the Mediterranean coupled system
We developed an atmosphere-ocean regional climate model (AORCM) for the Mediterranean basin, called the PROTHEUS system, composed by the regional climate model RegCM3 as the atmospheric component and by a regional configuration of the MITgcm model as the oceanic component. The model is applied to an area encompassing the Mediterranean Sea and compared to a stand-alone version of its atmospheric component. An assessment of the model performances is done by using available observational datasets.
Despite a persistent bias, the PROTHEUS system is able to capture the inter-annual variability of seasonal SST and also the fine scale spatio-temporal evolution of observed SST anomalies, with spatial correlation as high as 0.7 during summer. The close inspection of a 10-day strong wind event during the summer of 2000 pr