[1] This study presents the results of an application to a Bora severe weather episode (January 1995) in the northern Adriatic Sea of the regional two-way atmosphere-ocean coupled model (RAMS-DieCAST), developed jointly by the Università di Torino and the Istituto Sperimentale Talassografico del CNR, Trieste. RAMS-DieCAST showed significantly better ability to predict the sea surface temperature (SST) and its time evolution during the above mentioned episode using a full two-way coupling as opposed to simpler one-way forcing of the ocean. In this context, we found out that even in the highfrequency variability conditions that are typical of Bora events, heat fluxes from the sea must be taken into account for a better description of air-sea interaction processes in a dynamical framework. The SST evolution has been chosen as a validation parameter, owing to its availability and relevance for the characterization of the marine environment and local weather and climate studies. The simulations carried out with RAMS-DieCAST present a small systematic error in calculating the SST evolution; however, a sensitivity analysis of the model to the preparation of initial conditions of the simulation suggested that climatological initialization could be partly responsible for this error, which might be reduced by assimilating satellite-derived SSTs into the preparation of the initial conditions of the model.
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First results of gyrokinetic analysis of JET ELMy
H mode plasmas are presented.
ELMy H mode plasmas form the basis of conservative
performance predictions for tokamak reactors of the size of ITER.
Relatively high performance for long durations has been achieved and the
scaling appears to be favourable.
It will be necessary to sustain low Zeff and high
density for high fusion yield.
The article studies the degradation in confinement and the increase in
the anomalous heat transport observed in two JET plasmas:
one with an intense gas puff and the
other with a spontaneous transition from type I to III ELMs at the
heating power threshold.
Linear gyrokinetic analysis gives the growth rate γlin
of the fastest growing modes.
The flow shearing rate γE×B and γlin are large
near the top of the pedestal. Their ratio decreases approximately at the time when
the confinement degrades and the transport increases.
This suggests that tokamak reactors may require intense toroidal or
poloidal torque input to maintain sufficiently high
γE×B/γlin near the top of the pedestal for high confinement.
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