Atlantic Ocean Analysis and Forecast

MERCATOR-GLOBAL-PSY2V3-FOR

Production description (2008-07-23)

PropertyValue
PRODUCT-IDMERCATOR-GLOBAL-PSY2V3-FOR
PRODUCT TYPEocean-forecast
OUTPUT TYPEgrid-feature
PARAMETERS GROUP (from BODC)RFVL: Horizontal velocity of the water column (currents)
PSAL: Salinity of the water column
ASLV: Sea level
TEMP: Temperature of the water column
PARAMETERS (parameter, unit, convention)sea_ice_area_fraction,1,CF
sea_ice_thickness,m,CF
sea_ice_x_velocity,m_s-1,CF
sea_ice_y_velocity,m_s-1,CF
sea_surface_height_above_geoid,m,CF
sea_water_potential_temperature,K,CF
sea_water_salinity,1e-3,CF
sea_water_x_velocity,m_s-1,CF
sea_water_y_velocity,m_s-1,CF

Overview

Short description

The Operational Mercator global Ocean analysis and forecast – regional eddy resolving MERSEA 1/12deg.- forecasting system is running every week providing 14 days of 3D regional ocean forecast including Sea Ice as well as 14 days of ocean analysis. It is the operational nominal product for the North and Tropical Atlantic and Mediterranean basins..

Long product description (OVERVIEW)

The target MERSEA 1/12deg. regional forecasting system uses the NEMO (Nucleus for European Models of the Ocean) modeling system version 1.09 which includes the version 9 of the ocean model OPA, coupled to the thermodynamic-dynamic sea ice model LIM2 (Louvain sea Ice Model 2).

The atmospheric forcing fields which drive the system are calculated from ECMWF operational atmospheric analyses and forecast using an empirical bulk formulae parameterization.

The data assimilation technique is a multi-data and multivariate assimilation algorithm consisting of a Singular Extended Evolutive Kalman (SEEK) filter analysis method. The SEEK filter is a reduced-order Kalman filter introduced in the context of mesoscale ocean models with large computational needs. This method assimilates jointly satellite Sea Level Anomaly and Sea Surface Temperature, and in situ profiles of temperature and salinity. The error statistics are represented in a sub-space spanned by a small number of dominant 3D error directions.

The sea ice is fully comprehensive with the implementation of the LIM2 model. With sea ice concentration, sea ice/snow thicknesses, sea ice drift and sea ice thermal content prognosed by this multi-layer model based on the Semtner 3-layers and the Hibler visco-plastic formulations, the analyses and forecast handle most of the processes linked to the sea ice lifecycle.

The combination of an energy-enstrophy conserving scheme for momentum advection with a partial steps representation of the bottom topography yields significant improvements in the mean circulation and in the representation of western boundary currents such as the Gulf Stream and the downstream flow of the North Atlantic Current. In order to better resolve the upper layers, the vertical grid (50 levels) has been refined at the surface ending with a discretization of 1m until 20m depth and of 500m for the bottom layers. This surface refined-mesh has been designed to improve the circulation in the coastal shelves and to represent more adequately the impact of the atmospheric diurnal cycle, which is planned to be explicitly modeled in the near future.

In order to solve problems related to the size of each output file, the global output fields are available on the global area at the resolution of 1/2deg.. They also have been split up into several files. Ocean Fields are hence available in the following areas for delivery:
Area Grid resolution Projection

NAT North Atlantic 1/6deg. Mercator

TAT Tropical Atlantic 1/4deg. Mercator

MED Mediterranean Sea 1/8deg. Mercator

SPATIAL RESOLUTION: native 1/12deg.

GRID TYPE or GEOGRAPHICAL PROJECTION:
Area Grid resolution Projection

NAT North Atlantic 1/6deg. Mercator

TAT Tropical Atlantic 1/4deg. Mercator

MED Mediterranean Sea 1/8deg. Mercator

 

VERTICAL COVERAGE: 43 levels from 0 to 5000 meters.

0/5/10/15/20/25/30/40/50/60/75/100/125/150/175/200/225/250/300/400/500/600/700/800/900/1000/1100/1200/1300/

1400/1500/1750/2000/2250/2500/2750/3000/3250/3500/4000/4500/5000/5500/

In the MED area (Mediterranean Sea) , 40 levels from 0 to 4000 meters.

0/5/10/15/20/25/30/40/50/60/75/100/125/150/175/200/225/250/300/400/500/600/700/800/900/1000/1100/1200/1300/

1400/1500/1750/2000/2250/2500/2750/3000/3250/3500/4000/

 

TEMPORAL COVERAGE since 2008-04-09 – ONGOING

It is a time series with a sliding window of 1 year length

TEMPORAL RESOLUTION daily mean fields

Temporal window of each update 28days

Forecast length 14days

Analysis length 14days

Update frequency weekly every Tuesday

Time series Length of forecast: 14 days sliding window

Time series Length of best estimate analysis: 1 year sliding window

Operational or historical time series? Operational

Delivery

DistributorLicenceFormat
MERCATOR OCEANsee: http://www.mercator-ocean.fr/html/produits/description/acces_en.htmlopendap/application_octet-stream#cf
MERCATOR OCEANsee: http://www.mercator-ocean.fr/html/produits/description/acces_en.htmlhttp/Live Access Server
MERCATOR OCEANsee: http://www.mercator-ocean.fr/html/produits/description/acces_en.htmlopendap/application_octet-stream#cf
MERCATOR OCEANsee: http://www.mercator-ocean.fr/html/produits/description/acces_en.htmlopendap/application_octet-stream#cf