• Catalogue PIGMA
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CATDS-PDC L4OS SMOS/SMAP-OI - Weekly optimal interpolation salinity field product from SMOS and SMAP satellites and ISAS

This product contains weekly salinity field, based on SMOS and SMAP satellite data, and ISAS (In-Situ Analysis System).

Simple

Date (Publication)
2024-06-18
Identifier
https://sextant.ifremer.fr/record/639a918e-0711-4eff-965d-15a728acb27d
Identifier
CATDS-PDC_L4OS_OI
Credit
CATDS (CNES, IFREMER, LOPS)
Author
  CATDS (CNES, IFREMER, LOPS) - CATDS
Principal investigator
  LOPS - Nicolas Kolodziejczyk
Publisher
  CATDS (CNES, IFREMER, LOPS)
Thèmes Sextant
  • /Imagery/Satellite Imagery
GEMET - INSPIRE themes, version 1.0
  • Orthoimagery
Theme
  • SMOS
  • CATDS
  • CPDC
  • L4OS
  • Ocean Salinity
  • Ocean Product
  • OI
  • ISAS
Centre de données ODATIS
  • CDS-CERSAT
ODATIS aggregation parameters and Essential Variable names
  • Salinity
Type de jeux de donnée ODATIS
  • /Données d'observation/satellite
Use limitation
Creative Commons license to apply : Attribution (BY) : http://creativecommons.org/licenses/?lang=en
Access constraints
License
Use constraints
License
Spatial representation type
grid Grid
Denominator
1
Metadata language
English
Character set
utf8 UTF8
Topic category
  • Geoscientific information
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S
E
W
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Begin date
2010-05-31
Reference system identifier
EPSG / WGS 84 / NSIDC EASE-Grid 2.0 Global (EPSG:6933) / 8.6
Number of dimensions
3
Dimension name
Column
Dimension size
1388
Dimension name
Vertical
Dimension size
584
Dimension name
Sample
Dimension size
14
Cell geometry
Area
Transformation parameter availability
No
Distribution format
  • NetCDF ( netcdf 3 with 64 bit offset option )

OnLine resource
RE07 (SMOS only) ( WWW:DOWNLOAD )

RE07-SMOS - Reprocessed products (06/2010 - 05/2021), SMOS only

OnLine resource
OPER (SMOS only) ( WWW:DOWNLOAD )

OPER-SMOS - Operational products (06/2021 - now), SMOS only

OnLine resource
ATBD L3/L4 OS ( WWW:LINK )

Algorithm Theoretical Basis Document L3/L4 OS

OnLine resource
Reference ( WWW:LINK-1.0-http--publication-URL )

Kolodziejczyk Nicolas, Hamon Michel, Boutin Jacqueline, Vergely Jean-Luc, Reverdin Gilles, Supply Alexandre, Reul Nicolas (2021). Objective analysis of SMOS and SMAP Sea Surface Salinity to reduce large scale and time dependent biases from low to high latitudes. Journal Of Atmospheric And Oceanic Technology, 38(3), 405-421. Publisher's official version : https://doi.org/10.1175/JTECH-D-20-0093.1 , Open Access version : https://archimer.ifremer.fr/doc/00665/77702/

OnLine resource
FTP Access ( WWW:DOWNLOAD )

FTP Access - All products are also available by ftp : server ftp.ifremer.fr, login ext-catds-cpdc, passwd catds2010, path Ocean_products/GRIDDED/... (same paths as in above https links)

OnLine resource
CATDS Web portal ( WWW:LINK )

CATDS Web portal

OnLine resource
Digital Object Identifier (DOI) ( DOI )
Hierarchy level
Dataset
Statement

The base products, for all the CATDS-PDC (Centre Aval de Traitement des Données SMOS - Production & Dissemination Center) processing chains, are the SMOS L1B products - https://doi.org/10.57780/SM1-e20cf57 - from ESA (European Space Agency).

From these, brightness temperatures at various incidence angles are reconstructed. The Sea Surface Salinity (SSS) are retrieved from multi-angular brightness temperatures through a maximum likehood Bayesian approach in which measured Tb and Tb simulated using a forward direct model are compared (see Zine et al. 2008 for a general description of the retrieval method, and pro_con table for a summary of the similarities/differences with respect to ESA level 2 ocean salinity processing).

The L4OS SMOS/SMAP-OI product contains global Level 4 analyses of the of the Sea Surface Salinity (SSS), Sea Surface Density (SSD) and Sea Surface Spiciness (SSSp), along with Sea Surface Absolute Salinity (SSA), Conservative Temperature (SCT), surface thermal expansion coefficient (alpha) and haline contraction coefficient (beta). The SSS product is obtained using an optimal interpolation (OI) algorithm, that combines ISAS in situ SSS OI analyses and satellites image to reduce large scale and temporally varying bias. Two version exists: one with SMOS (Soil Moisture Ocean Salinity) satellite data (since 06/2010), and one with both SMOS and SMAP (Soil Moisture Active and Passive) satellite data (since 04/2015). The SSS L4 product outcome is then combined with satellite SST products to compute thermodynamic sea water parameters using TEOS-10 (Kolodziejczyk et al., 2021).

Products from reprocessing RE07 are available for the period 06/2010 - 05/2021. Products from operational (OPER) processing are available since 06/2021. Reprocessed products and operational products are derived using the same algorithm and configuration, hence ensuring the temporal continuity.

These products are generated with a delay of about 1 month after the end of the period.

File naming :

SM_clas_MIR_CSF4On__startdate_enddate_vvv_ccc_7

- clas: File class (OPER : operational mode, REXX : reprocessing xx)

- n: 1 for SMOS only (since 06/2010), 2 for SMOS+SMAP (since 04/2015)

- startdate: sensing start date/time of the data (format yyyymmddThhmiss)

- enddate: sensing end date/time of the data (format yyyymmddThhmiss)

- vvv: version number of the processor generating the product

- ccc: file counter

File format :

In each archive file (.tgz extension), there are two files

- A Header file (.HDR), which is a text file, in XML Earth Explorer Header format

- A Data file (.DBL.nc), which is a netcdf file, format variant 2 (netcdf 3 with 64 bits offset option)

Simplified version:

This product is also available on Copernicus Marine Service as product MULTIOBS_GLO_PHY_SSS_L4_MY_015_015.

The files are in NetCDF 4, with the alternative file naming:

CATDS_CSF4On_startdate_enddate_vvv_p.nc

- n: 1 for SMOS only (2010-03/2015), 2 for SMOS+SMAP (after 04/2015)

- startdate : sensing start date/time of the data (format yyyymmddThhmiss)

- enddate : sensing end date/time of the data (format yyyymmddThhmiss)

- vvv : version number of the processor generating the product

- p: processing step: 2 for operational processing, 3 for reprocessed.

Reference :

Kolodziejczyk Nicolas, Hamon Michel, Boutin Jacqueline, Vergely Jean-Luc, Reverdin Gilles, Supply Alexandre, Reul Nicolas (2021). Objective analysis of SMOS and SMAP Sea Surface Salinity to reduce large scale and time dependent biases from low to high latitudes. Journal Of Atmospheric And Oceanic Technology, 38(3), 405-421. Publisher's official version : https://doi.org/10.1175/JTECH-D-20-0093.1 , Open Access version : https://archimer.ifremer.fr/doc/00665/77702/

File identifier
639a918e-0711-4eff-965d-15a728acb27d XML
Metadata language
English
Character set
UTF8
Hierarchy level
Dataset
Date stamp
2025-05-15T22:39:19.83525Z
Metadata standard name
ISO 19115-3 - SEXTANT
Metadata standard version
1.0
Point of contact
  IFREMER - Tarot Stephane
Centre Bretagne - ZI de la Pointe du Diable - CS 10070 - 29280 Plouzané , Brest , France
02 98 22 40 55
 
 

Overviews

overview

Spatial extent

N
S
E
W
thumbnail


Keywords

CATDS CPDC ISAS L4OS OI Ocean Product Ocean Salinity SMOS
Centre de données ODATIS
CDS-CERSAT
GEMET - INSPIRE themes, version 1.0
Orthoimagery
ODATIS aggregation parameters and Essential Variable names
Salinity
Thèmes Sextant
/Imagery/Satellite Imagery
Type de jeux de donnée ODATIS
/Données d'observation/satellite

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