Numerical forecasts of the seas around Sardinia and coastal waters (western Mediterranean)
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This is an electronic report for the daily numerical forecast of the sea state in the seas around Sardinia (hydrodynamics, waves) produced at a spatial resolution of 3 km, in the Oristano coastal waters (central Sardinian Sea) e in the Bonifacio Mouths and La Maddalena Archipelago (NE Sardinia) by the WMED system. The time used is UTC (+1 hour with solar time, +2 hours with legal time). General domain:
3-16 °E; 36.5-44.5 °N
Overview - Western Mediterranean Forecast -
The numerical simulation system of the marine circulation at sub-regional scale (3 km) of the seas around Sardinia gives a daily forecast, to maximum 5 days, of some hydrodynamical mean fields (temperature, salinity, speed and other physical parameters) starting from 00:00 UTC. The system is operative since February 2005. The simulation numerical model is based on the 3D ocean circulation model called POM (Princeton Ocean Model developed by Blumberg and Mellor, 1987) and is numerically coupled to lateral boundaries with the simulation numerical model of the whole Mediterranean circulation (MFSTEP-OGCM), developed at the Dynamics and Climatology Unit of the INGV in Bologna (Pinardi et al., 2003). The numerical coupling is one-way asynchronously nested. At the surface boundary the forecast numerical model at sub-regional scale is forced through momentum fluxes, heat and "water"
calculated by the hourly fields of the atmospheric parameters (wind speed, wind direction, humidity, cloud coverage, solar radiation, etc.). These parameters are simulated by the forecast numerical model at high spatial resolution (10 km) of the atmospheric circulation (called Skiron), developed at the Atmospheric Modeling & Weather Forecasting Group of the Athens University (Kallos et al., 2005). The calculation of fluxes at the air-sea interface is realised
asynchronously
by the use of an interactive algorithm based on the bulk formulae. The forecasting numerical system works in Slave Mode and Near-Real-Time, i.e. the simulation model is daily re-initialized by using the daily numerical fields produced by the numerical simulation model at basin scale (5 km) MFSTEP-OGCM. Near-Real-Time means that "assimilated" data are available within 3 days from the real acquisition date of the data. Due to acquisition and calculation times, the forecast is realised with a late of about 15 hours.The numerical simulation system of the coastal wave field provides a daily forecast, to maximum 5 days, of the wave height & direction in the western Mediterranean area (seas around Sardinia) at steps of 3 hours. The core of the forecasting system is the SHYFEM, a finite element hydrodynamic numerical model that has been already validated and calibrated in previous studies (Ferrarin et al., 2004, Cucco et al., 2006). Such a model well reproduces the tide and wind induced water circulation in the study area where it is applied in its 2D version in order to reproduce the wave height & direction. Numerical simulations are carried out over a computational domain that represents the area between 003°-016° of longitude E and 36.5°-44.5° of latitude N, by means of a finite element staggered grid. The numerical grid consists nodes and triangular elements with different spatial resolutions varying from 10m, for the smallest coastal areas, to few kms off-shore. The model considers the off-shore perimeter of the computational domain as open boundary. The model is forced by an astronomic tide imposed at the open boundary and by a wind intensity and direction imposed as surface boundary condition. Meteorological data are provided by means of the SKIRON high resolution atmospheric numerical model.
- Bonifacio Mouths and La Maddalena Archipelago -
The numerical simulation system of the coastal circulation provides two daily forecasts, to maximum 3 days each, of the barotropic current velocities and waves in the Bonifacio Mouths and in La Maddalena Archipelago at steps of 6 hours. The core of the forecasting system is the SHYFEM, a finite element hydrodynamic numerical model that has been already validated and calibrated in previous studies (Ferrarin et al., 2004, Cucco et al., 2006). Such a model well reproduces the tide and wind induced water circulation in the study area where it is applied in its 2D version in order to reproduce the barotropic current velocities and waves. Numerical simulations are carried out over a computational domain that represents the area between
009°6.899' and
009°37.06' of longitude E and,
41°6.2' and
41°25.683' of latitude N, by means of a finite element staggered grid. The numerical grid consists of
40000
nodes and
70000
triangular elements and is characterized by different spatial resolutions varying from 10m, for the smallest channels in the La Maddalena Archipelago, to few kms in the off-shore areas inside and outside the Bonifacio Mouths. The model considers the off-shore perimeter of the computational domain as open boundary. The model is forced by an astronomic tide imposed at the open boundary and by a wind intensity and direction imposed as surface boundary condition. Meteorological data are provided by atmospheric simulations carried out at the Athens University by means of SKYRON high resolution atmospheric numerical model.
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Contact |
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In Sardu |
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Versione Italiana |
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Dr Roberto Sorgente IAMC-CNR Oristano, c\o IMC, Loc. Sa Mardini, 09170 Torregrande, Oristano, Italy  tel. +39.0783.229015-229137 (direct) fax +39.0783.229135 email: roberto.sorgente@cnr.it |
Disclaimer: the contents offered in this portal are free, prepared with our highest care/diligence and accurately controlled by the researchers of the IAMC-CNR in Oristano. The IAMC-CNR in Oristano, nevertheless, refuse all responsibility, direct and indirect, towards users and generally of any third part, for incidental delays, inaccuracy, errors, omissions, damages (direct, indirect, consequent, punishable and sanctionable) coming from the above contents.
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