MERCATOR French Ocean System: Medium-Resolution Atlantic Product (assimilation by optimal interpolation of altimetry and in situ data)
Entry ID: PSY1V2

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Summary
Abstract: Mercator has been providing weekly analysis and real-time nowcast (T0), and
forecast (T0+7 days and T0 +14 days) bulletins of the three-dimensional ocean
in the North and tropical Atlantic up to 20 degrees S since January 17th 2001.
This medium-resolution bulletin (PSY1V2, 1/3 degree; one point computed every
35 km at the equator) gives conditions from the surface right down to the
bottom and covers the North and Tropical Atlantic. This resolution is
suitable for monitoring ocean circulation on a large scale. For more
information see Mercator Configurations Summary at
"http://www.mercator-ocean.fr/html/mod_actu/public/welcome_en.php3"

Additional information about the Model:
---------------------------------------------------
Mercator ocean system is based on the 8.1 version of the OPA z-coordinates code
(Madec et al. 1998). OPA is an incompressible Navier-Stokes primitive-
equation model using Boussinesq rigid-lid approximation that describes the
temporal evolution of velocity, temperature and salinity in three dimensions.
Mixed layer dynamic is ruled by TKE turbulent closure equations (1.5 closure
scheme) (Blanke et al. 1993). The ocean model configuration used in this
prototype (PSY2) is the first model configuration (1/3 degrees) "Maquette
Atlantique Nord" (MNATL) between 20 degrees S and 70 degrees N with 43 vertical
levels. No ice model is used. Ice is "diagnostic", i.e., assumed present under
a fixed freezing temperature (1.8 degrees Celsius). The bathymetry is processed
from the Smith and Sandwell (1997) data base and ETOPO5. Momentum and heat
forcings are daily ECMWF forcing. Surface temperature is restored from Reynolds
analyses (Reynolds & Smith, 1994), which include satellite and in-situ
observations. Surface salinity is restored from climatology. The model is
initialized using Reynaud (Reynaud et al. 1998) seasonal climatology.

Assimilation Method:
--------------------------
The data assimilation method (SAM; Systeme d'Assimilation Mercator) used is the
reduced-order optimal interpolation (OI) scheme SOFA (Sub Optimal Filtering of
Altimetry) (De Mey and Benkiran, 2002) coupled with the PALM software coupler
(PALM group, 2000). The baroclinic component is corrected applying a
lifting-lowering method similar to Cooper and Haines method (1996). Data
assimilation is stopped along isobaths 500m towards the coast. Sea level
anomaly (SLA) from Jason1/ERS2-Envisat/GFO is assimilated along track, once a
week. The mean sea surface height (MSSH) used during the assimilation process
is the one from Rio et al. (2003) diagnosed from in-situ observations in the
Atlantic ocean. In the Mediterranean basin, MSSH is made out of several
numerical simulations. Version 1 products assimilates altimetry data (SLA)
only, while version 2 products assimilates altimetry and in situ data (SLA,
Sea Surface Temperature (SST), Sea Surface Salinity (SSS) and In situ
profiles).

Mercator bulletins contain a range of parameters selected to depict ocean
conditions and dynamics. These include: salinity, temperature, surface
currents, zonal, meridian and vertical velocities, transport, sea surface
height, mixed layer depth, barotropic height, baroclinic height. "Model:
analysis and forecasting" 3D ocean products can be accessed on-line through
Mercator Web Products (full domain and zonal animations, whole maps, zonal
maps, sections and moorings graphs). For additional product information see
"http://www.mercator-ocean.fr/html/produits/description/welcome_en.html".
Mercator web products are designed for a wide audience (freely available),
while numerical products are files for professional users and are available on
a remote server. Please make an e-mail request to products@mercator-ocean.fr
Archive bulletins are also available to identify longer-term patterns.

Mercator web Medium-resolution North and Tropical Atlantic (PSY1V2, 1/3
degrees) products can be browsed on MERCATOR product web site:
"http://bulletin.mercator-ocean.fr/html/welcome_en.jsp"

Related URL
Link: VIEW PROJECT HOME PAGE
Description: Mercator Ocean Main Webpage


Link: VIEW PROJECT HOME PAGE
Description: Mercator Ocean Web products.
3D modelled ocean: nowcasts and forecasts (medium resolution Atlantic 1/3
degree; high resolution North Atlantic and Mediterranean 1/15 degree; global
low resolution 2 degree); and global observed ocean, data intercomparison and 3
D reconstitution of oceanic fields.


Link: VIEW RELATED INFORMATION
Description: Mercator Web products hanbook webpage (including the "Model: analysis and
forecasting" products handbook and the "Observed ocean" products handbook).
This handbook gives you the keys to understanding the 2,000 images you can see
every week in the Mercator Web bulletin. The "observed ocean" system is based
on altimetry and in situ data measurements. Additional information about
Mercator configuration can also be found.


Parent DIF
This data set description is a member of a collection. The collection is described in
MERCATOR


Data Set Citation
Dataset Originator/Creator: Mercator Ocean
Dataset Title: Medium-resolution Atlantic (PSY1V2)
Version: V2 (altimetry and in situ data assimilation)
Online Resource: http://www.mercator-ocean.fr/html/mod_actu/public/welcome_en.php3


Temporal Coverage
Start Date: 2001-01-17


Location Keywords
OCEAN > ATLANTIC OCEAN
OCEAN > ATLANTIC OCEAN > NORTH ATLANTIC OCEAN
GEOGRAPHIC REGION > TROPICS


Data Resolution
Latitude Resolution: 1/3 degrees (35 km at the equator)
Longitude Resolution: 1/3 degrees (35 km at the equator)
Vertical Resolution: 43 levels from surface to bottom (12-200m)
Temporal Resolution: daily, weekly


Science Keywords
OCEANS >OCEAN CIRCULATION >DIFFUSION    [Definition]
OCEANS >OCEAN CIRCULATION >OCEAN CURRENTS    [Definition]
OCEANS >OCEAN CIRCULATION >OCEAN MIXED LAYER    [Definition]
OCEANS >OCEAN HEAT BUDGET >HEAT FLUX    [Definition]
OCEANS >OCEAN TEMPERATURE >OCEAN MIXED LAYER    [Definition]
OCEANS >OCEAN TEMPERATURE >SEA SURFACE TEMPERATURE    [Definition]
OCEANS >OCEAN TEMPERATURE >THERMOCLINE    [Definition]
OCEANS >OCEAN TEMPERATURE >WATER TEMPERATURE    [Definition]
OCEANS >OCEAN WINDS >WIND STRESS    [Definition]
OCEANS >SALINITY/DENSITY >HALOCLINE    [Definition]
OCEANS >SALINITY/DENSITY >PYCNOCLINE    [Definition]
OCEANS >SALINITY/DENSITY >SALINITY    [Definition]
OCEANS >SEA SURFACE TOPOGRAPHY >SEA SURFACE HEIGHT    [Definition]


ISO Topic Category
ELEVATION
OCEANS


Platform
ERS-2 >European Remote Sensing Satellite-2    [Information]
GFO-1 >GEOSAT FOLLOW-ON-1    [Information]
JASON-1    [Information]
NOAA POES >NOAA Polar Orbiting Environmental Satellites    [Information]
ENVISAT >Environmental Satellite    [Information]


Instrument
ALTIMETERS    [Information]
RADAR ALTIMETERS    [Information]
CTD >Conductivity, Temperature, Depth    [Information]
DRIFTING BUOYS    [Information]
XBT >Expendable Bathythermographs    [Information]
AVHRR >Advanced Very High Resolution Radiometer    [Information]
POSEIDON-2 >JASON-1 RADAR ALTIMETER    [Information]


Project
GODAE >Global Ocean Data Assimilation Experiment    [Information]
MERSEA >Marine Environment and Security for the European Area    [Information]
MERCATOR >MERCATOR OCEAN-Operational Oceanography    [Information]


Access Constraints
Mercator web real time image products (GIF format) are designed for a wide
audience (freely available, except zonal maps younger than 30 days need
authorized access), while numerical products are files for professional users
and are available on a remote server with authorized access.

Please, you must justify your request to these products. E-mail request to
products@mercator-ocean.fr or download the form


Keywords
model assimilation
altimetry data
sea surface temperature
in situ data
model intercomparison
operational oceanography


Data Set Progress
IN WORK


Originating Center


Data Center
MERCATOR OCEAN-Operational Oceanography, France    [Information]
Data Center URL: http://www.mercator-ocean.fr/

Data Center Personnel
Name: GIP MERCATOR OCEAN USER SERVICES
Phone: 33 5 61 39 38 02
Fax: 33 5 61 39 38 99
Email: products at mercator-ocean.fr
Contact Address:
Parc Technologique du Canal
8-10 rue Hermes
City: Ramonville St Agne
Postal Code: 31520
Country: FRANCE



Distribution
Distribution_Media: Image Browse (public access), Remote Server (restricted access)
Distribution_Format: GIF, NetCDF, CF/COARDS


Personnel
VINCENT TOUMAZOU
Role: TECHNICAL CONTACT
Email: vincent.toumazou at mercator-ocean.fr


MELANIE F. MEAUX
Role: DIF AUTHOR
Email: gsfc-gcmduso at mail.nasa.gov



Creation and Review Dates
DIF Creation Date: 2004-12-28
Last DIF Revision Date: 2009-04-15

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