6 research outputs found
Last improvements in the data assimilation scheme for the Mediterranean Analysis and Forecast system of the Copernicus Marine Service
The Mediterranean Forecasting System (MFS) is a numerical ocean prediction system that produces
analyses, reanalyses and short term forecasts for the entire Mediterranean Sea and its Atlantic Ocean
adjacent areas. The system is now part of the Copernicus Marine Environment Monitoring Service
(CMEMS) providing regular and systematic information about the physical state and dynamics of the
Mediterranean Sea through the Med-MFC (Mediterranean Monitoring and Forecasting Center). MFS has
been implemented in the Mediterranean Sea with 1/16o horizontal resolution and 72 vertical levels and is
composed by the hydrodynamic model NEMO (Nucleus for European Modelling of the Ocean) 2-way
online coupled with the third generation wave model WW3 (WaveWatchIII) and forced by ECMWF
atmospheric fields at 1/8o horizontal resolution. The model solutions are corrected by the data
assimilation system (3D variational-3Dvar scheme adapted to the oceanic assimilation problem, Dobricic
and Pinardi, 2008) with a daily assimilation cycle of satellite Sea Level Anomaly (SLA) and vertical
profiles of Temperature and Salinity. In this study we present a new estimate the of the background error
covariance matrix with vertical Empirical Orthogonal Functions (EOFs) that are defined at each grid
point of the model domain in order to better account for the error covariance between temperature and
salinity in the shelf and open ocean areas. Moreover the Error covariance matrix is z-dependent and
varies in each month. This new dataset has been tested and validated for more than 2 years against a background error correlation matrix varying only seasonally and in thirteen sub-regions of the
Mediterranean Sea. Latest developments include the implementation of an upgraded 3Dvar (Storto et al.
2012) for a high-resolution model, 1/24o in the horizontal and 141 vertical levelsPublishedBergen, Norway3SR. AMBIENTE - Servizi e ricerca per la Societ
Last improvements in the data assimilation scheme for the Mediterranean Analysis and Forecast system of the Copernicus Marine Service
The Mediterranean Forecasting System (MFS) is a numerical ocean prediction system
that produces analyses, reanalyses and short term forecasts for the entire Mediterranean
Sea and its Atlantic Ocean adjacent areas. The system is now part of the Copernicus
Marine Environment Monitoring Service (CMEMS) providing regular and systematic
information about the physical state and dynamics of the Mediterranean Sea through
the Med-MFC (Mediterranean Monitoring and Forecasting Center).
MFS has been implemented in the Mediterranean Sea with 1/16o horizontal resolution
and 72 vertical levels and is composed by the hydrodynamic model NEMO (Nucleus
for European Modelling of the Ocean) 2-way online coupled with the third generation
wave model WaveWatchIII (Clementi et al., 2017a) and forced by ECMWF atmospheric
fields at 1/8° horizontal resolution. The model solutions are corrected by the data
assimilation system (3D variational scheme, Dobricic and Pinardi, 2008) with a daily
assimilation cycle of along track satellite Sea Level Anomaly (SLA) and vertical profiles
of Temperature and Salinity from ARGO and gliders. In this study we present a new
estimate of the background error covariance matrix with vertical Empirical Orthogonal
Functions (EOFs) that are defined at each grid point of the model domain in order to
better account for the error covariance between temperature and salinity in the shelf and
open ocean areas. Moreover the Observational error covariance matrix is z-dependent
and varies in each month. This new dataset has been tested and validated for more
than 2 years against a background error correlation matrix varying only seasonally and
in thirteen sub-regions of the Mediterranean Sea (Dobricic et al. 2005).PublishedBergen, Norway3SR. AMBIENTE - Servizi e ricerca per la Societ
A 1/24 degree resolution Mediterranean analysis and forecast modeling system for the Copernicus Marine Environment Monitoring Service
The Mediterranean Forecasting System (MFS) is a numerical ocean prediction system that operationally
produces analyses, reanalyses and short-term forecasts of the main physical parameters for the entire
Mediterranean Sea and its Atlantic Ocean adjacent areas. This work is specifically focused on the
description and evaluation of the analysis and forecast modeling system that covers the analysis of the
current situation and produces daily updates of the following 10 days forecast. The system has been
recently upgraded in the framework of the Copernicus Marine Environment Monitoring Service
(CMEMS) by increasing the grid resolution from 1/16o to 1/24o in the horizontal and from 72 to 141
vertical levels, by increasing the number of fresh water river inputs and by updating the data assimilation
scheme. 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. In order to validate the modeling system and to
estimate the accuracy of the model products, a quality assessment is regularly performed including both
pre-operational qualification and near real time (NRT) validation procedures. Pre-operational
qualification activities focus on testing the improvements of the quality of the new system with respect
to the previous version and relies on past simulation and historical data, while NRT validation activities
aim at routinely and on-line providing the skill assessment of the model analysis and forecasts and relies
on the NRT available observations. The focus of this work is to present the new operational modeling
system and the skill assessment including comparison with independent (insitu coastal moorings) and
quasi-independent (insitu vertical profiles and satellite) datasets.PublishedBergen, Norway3SR. AMBIENTE - Servizi e ricerca per la Societ
A 1/24° resolution Mediterranean physical analysis and forecasting system for the Copernicus Marine Environment Monitoring Service
This study describes a new model implementation for the Mediterranean Sea that has
been achieved in the framework of the Copernicus Marine Environment Monitoring
Service (CMEMS). The numerical ocean prediction system, that operationally produces
analyses and forecasts of the main physical parameters for the entire Mediterranean
Sea and its Atlantic Ocean adjacent areas, has been upgraded by increasing the grid
resolution from 1/16o to 1/24o in the horizontal and from 72 to 141 unevenly spaced
vertical levels, by increasing the number of fresh water river inputs and by updating
the data assimilation scheme. The model has a non-linear explicit free surface and it
is forced by surface pressure, interactive heat, momentum and water fluxes at the airsea
interface. The focus of this work is to present the new modelling system which
will become operational in the near future and the validation assessment including
the comparison with an independent non assimilated dataset (coastal moorings) and
quasi-independent (in situ vertical profiles and satellite) datasets. The results show
that the higher resolution model is capable of representing most of the variability
of the general circulation in the Mediterranean Sea, however some improvements
need to be implemented in order to enhance the model ability in reproducing specific
hydrodynamic features particularly the Sea Level Anomaly.PublishedBergen, Norway3SR. AMBIENTE - Servizi e ricerca per la Societ
Mediterranean Sea physics Analysis and Forecast (CMEMS MED-Currents 2015-2017)
The CMEMS Mediterranean Sea Physics Analysis and Forecast system comprises an Ocean General Circulation Model based on NEMO v3.6 and a variational data assimilation scheme (OceanVar) for temperature and salinity vertical profiles and satellite SLA along track data. The model has a 1/24\u2dauniform horizontal grid resolution and 141 unevenly spaced vertical levels. It spans the time period 2015-2017 and it is daily updated