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Crise, Alessandro
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Crise, Alessandro
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- PublicationOpen AccessThe Copernicus Marine Service ocean forecasting system for the Mediterranean Sea(2019-05-06)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;; ; ; ; ;; ;The Mediterranean Monitoring and Forecasting Center (MED-MFC) is part of the Copernicus Marine Environment and Monitoring Service (CMEMS) and provides regular and systematic information on the time-evolving Mediterranean Sea physical (including waves) and biogeochemical state. The systems consist of 3 components: 1) Med-Physics, a numerical ocean prediction systems, based on NEMO model, that operationally produces analyses, reanalysis and short term forecasts of the main physical parameters; 2) Med-Biogeochemistry, a biogeochemical analysis, reanalysis and forecasting system based on the Biogeochemical Flux Model (BFM) which provides information on chlorophyll, phosphate, nitrate, primary productivity, oxygen, phytoplankton biomass, pH and pCO2; 3) Med-Waves based on WAM model and providing analysis, forecast and reanalysis products for waves. The systems have been recently upgraded at a resolution of 1/24 degree in the horizontal and 141 vertical levels. The Med-Physics analysis and forecasting system is composed by the hydrodynamic model NEMO 2-way coupled with the third-generation wave model WaveWatchIII and forced by ECMWF atmospheric fields. The model solutions are corrected by the 3DVAR data assimilation system (3D variational scheme adapted to the oceanic assimilation problem) with a daily assimilation cycle of sea level anomaly and vertical profiles of temperature and salinity. The model has a non-linear explicit free surface and it is forced by surface pressure, interactive heat, momentum and water fluxes at the air-sea interface. The biogeochemical analysis and forecasts are produced by means of the MedBFM v2.1 modeling system (i.e. the physical-biogeochemical OGSTM-BFM model coupled with the 3DVARBIO assimilation scheme) forced by the outputs of the Med-Physics product. Seven days of analysis/hindcast and ten days of forecast are bi-weekly produced on Wednesday and on Saturday, with the assimilation of surface chlorophyll concentration from satellite observations. In-situ data are mainly used to estimate model uncertainty at different spatial scales. The Med-Waves modelling system is based on the WAM Cycle 4.5.4 wave model code. It consists of a wave model grid covering the Mediterranean Sea at a 1/24° horizontal resolution, nested to a North Atlantic grid at a 1/6° resolution. The system is forced by ECMWF winds at 1/8°. Refraction due to surface currents is accounted by the system which assimilates altimeter along-track significant wave height observations. On a daily basis, it provides 1-day analysis and 5-day forecast hourly wave parameters. Currently, wave buoy observations of significant wave height and mean wave period along with satellite observations are used to calibrate and validate the Med-waves modelling system.111 64 - PublicationRestrictedA new EMAG metrological approach for submarine detection: fundamentals of the numerical protocols and preliminary field performance(2012-05-29)
; ; ; ; ; ; ; ;Faggioni, O.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia ;Soldani, M.; OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale) - Sgonico (TS) - Italy ;Leoncini, D.; OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale) - Sgonico (TS) - Italy ;Crise, A.; OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale) - Sgonico (TS) - Italy ;Grandinetti, P.; WASS SpA - Livorno - Italy ;Nasta, S.; Marina Militare Italiana - CSSN - La Spezia - Italy ;Zunino, R.; Università di Genova - Genova - Italy; ; ; ; ; ; The characteristics of the geomagnetic field and its artificial components make the capability of reading and classifying large underwater cinematic sources (e.g. submarines) somewhat random. As an example the “ASW far detection procedure” is also affected by the induced magnetic field produced by man-made telluric currents. This could generate some dangerous false alarm. The problem is not an instrumental issue related to the instrument precision of the sensor (commercial magnetometers have precisions greater than the one required by the application) but a classical metrological matter that could be overcome with a correct measurement procedure. This moves the problem from technological to phenomenological aspects. By applying the C.A.I.MA.N. (Coastal Anti-Intruder MAgnetometric Network) experience, inter-nodal distances in the observation chain were calculated so as to correlate the noise and de-correlate the target signal (source type SU.S. "SUbmarine Standard"). By means of C.A.I.MA.N. protocols, targets signal contained in the “detection magnetogram” F(target) was isolated from F(noise+target) magnetogram using F(noise) (that includes also natural variations) as Time-Domain filter, and then submitted to standard LP procedure to increase the information capability. Finally, to overcome metrological problems related to the low incremental ratio [∂F/∂s]ds of the detected signal, we propose a power domain analysis of the detection magnetogram. Also without a dedicated technology, in a preliminary experiment for SU.S. detection the C.A.I.MA.N. anti-intruder system has been occasionally modified: the first results obtained in this study were found encouraging and further detailed investigations within this framework should be undertaken in a future study.134 23 - PublicationOpen AccessPre-operational short-term forecasts for Mediterranean Sea biogeochemistry(2010)
; ; ; ; ; ; ; ; ;Lazzari, P.; Istituto Nazionale di Oceanografia e Geofisica sperimentale ;Teruzzi, A.; Istituto Nazionale di Oceanografia e Geofisica sperimentale ;Salon, S.; Istituto Nazionale di Oceanografia e Geofisica sperimentale ;Campagna, S.; CINECA ;Calonaci, C.; CINECA ;Colella, S.; CNR, ISAC ;Tonani, M.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Bologna, Bologna, Italia ;Crise, A.; Istituto Nazionale di Oceanografia e Geofisica sperimentale; ; ; ; ; ; ; Operational prediction of the marine environment is recognised as a fundamental research issue in Europe. We present a pre-operational implementation of a biogeochem- ical model for the pelagic waters of the Mediterranean Sea, developed within the framework of the MERSEA-IP Euro- pean project. The OPATM-BFM coupled model is the core of a fully automatic system that delivers weekly analyses and forecast maps for the Mediterranean Sea biogeochem- istry. The system has been working in its current configura- tion since April 2007 with successful execution of the fully automatic operational chain in 87% of the cases while in the remaining cases the runs were successfully accomplished af- ter operator intervention. A description of the system devel- oped and also a comparison of the model results with satel- lite data are presented, together with a measure of the model skill evaluated by means of seasonal target diagrams. Future studies will address the implementation of a data assimila- tion scheme for the biogeochemical compartment in order to increase the skill of the model’s performance.240 168