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  • 1
    Publication Date: 2021-05-19
    Description: The Mediterranean is expected to be one of the most prominent and vulnerable climate change “hotspots” of the twenty-first century, and the physical mechanisms underlying this finding are still not clear. Furthermore, complex interactions and feedbacks involving ocean–atmosphere–land–biogeochemical processes play a prominent role in modulating the climate and environment of the Mediterranean region on a range of spatial and temporal scales. Therefore, it is critical to provide robust climate change information for use in vulnerability–impact–adaptation assessment studies considering the Mediterranean as a fully coupled environmental system. The Mediterranean Coordinated Regional Downscaling Experiment (Med-CORDEX) initiative aims at coordinating the Mediterranean climate modeling community toward the development of fully coupled regional climate simulations, improving all relevant components of the system from atmosphere and ocean dynamics to land surface, hydrology, and biogeochemical processes. The primary goals of Med-CORDEX are to improve understanding of past climate variability and trends and to provide more accurate and reliable future projections, assessing in a quantitative and robust way the added value of using high-resolution and coupled regional climate models. The coordination activities and the scientific outcomes of Med-CORDEX can produce an important framework to foster the development of regional Earth system models in several key regions worldwide.
    Description: Published
    Keywords: MED-CORDEX ; Climate changes
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.1187-1208
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  • 2
    Publication Date: 2023-07-05
    Description: Cyclones are essential elements of the climate system and water cycle but also major natural hazards in the densely populated Mediterranean basin. In the framework of the COST Action "European network for Mediterranean cyclones in weather and climate - MedCyclones", a model intercomparison project investigates the dynamics and predictability of case studies using modelling setups that are not yet available to operational forecasting systems. The intercomparison involves 10 sets of simulations based on 5 mesoscale models and multiple combinations of physical parameterizations. All sets include the same sensitivity simulations to initial and lateral boundary conditions and horizontal resolution. Here we focus on tropical-like cyclone (Medicane) Ianos that hit Greece in mid September 2020 and was poorly predicted by operational forecasts. Models systematically perform better when initialized from operational IFS analysis data compared to the widely used ERA5 reanalysis. Reducing horizontal grid spacing from 10 km (convection-parameterized) to 2 km (convection-permitting) further improves the cyclone track and intensity. This highlights the critical organization of convection during the early cyclogenesis for the phasing with an upper-level jet. Higher resolution enhances convective activity and favorably preconditions the jet, which controls the subsequent cyclone intensification and evolution.The 10 sets of simulations show robust agreement but also reveal model specificities such as the possible need for a convective parameterization even at 2 km horizontal grid spacing. While they require generalization to other cases of Mediterranean cyclones, the results shall provide guidance for the next generation of global convection-permitting models in weather and climate.
    Language: English
    Type: info:eu-repo/semantics/conferenceObject
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