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 satellite data, and ISAS (In-Situ Analysis System).
Simple
- Title
-
CATDS-PDC L4OS SMOS/SMAP-OI - Weekly optimal interpolation salinity field product from SMOS and SMAP satellites and ISAS
- Date (Publication)
- 2024-06-18
- Citation identifier
- CATDS-PDC_L4OS_OI
- Abstract
-
This product contains weekly salinity field, based on SMOS satellite data, and ISAS (In-Situ Analysis System).
- Credit
-
CATDS (CNES, IFREMER, LOPS)
- Point of contact
-
Organisation name Individual name Electronic mail address Role CATDS (CNES, IFREMER, LOCEAN, ACRI)
CATDS
Author LOPS
Nicolas Kolodziejczyk
Principal investigator CATDS (CNES, IFREMER, LOCEAN, ACRI)
Publisher
-
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-SAT-CERSAT
-
-
Thèmatiques ODATIS
-
-
Remote sensing
-
-
ODATIS aggregation parameters and Essential Variable names
-
-
Salinity
-
- 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
- Denominator
- 1
- Language
- English
- Character set
- UTF8
- Topic category
-
- Geoscientific information
- 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
- Distribution format
-
Name Version NetCDF
netcdf 3 with 64 bit offset option
- OnLine resource
-
Protocol Linkage Name WWW:DOWNLOAD-1.0-link--download
https://data.catds.fr/cpdc/Ocean_products/GRIDDED/L4OS/RE07/MIR_CSF4O1/ RE07 (SMOS only)
WWW:DOWNLOAD-1.0-link--download
https://data.catds.fr/cpdc/Ocean_products/GRIDDED/L4OS/OPER/MIR_CSF4O1/ OPER (SMOS only)
WWW:LINK
https://doi.org/10.13155/92266 ATBD L3/L4 OS
WWW:LINK-1.0-http--publication-URL
https://doi.org/10.1175/JTECH-D-20-0093.1 Reference
WWW:DOWNLOAD-1.0-link--download
ftp://ftp.ifremer.fr/ FTP Access
- OnLine resource
-
Protocol Linkage Name WWW:LINK
https://www.catds.fr/ CATDS Web portal
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--metadata-URL
https://doi.org/10.12770/639a918e-0711-4eff-965d-15a728acb27d Digital Object Identifier (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, 2 for SMOS+SMAP
- 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 04/2025)
- 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/
Metadata
- File identifier
- 639a918e-0711-4eff-965d-15a728acb27d
- Metadata language
- English
- Character set
- UTF8
- Hierarchy level
- Dataset
- Date stamp
- 2024-07-10T09:54:29.591Z
- Metadata standard name
-
ISO 19115:2003/19139 - SEXTANT
- Metadata standard version
-
1.0
- Metadata author
-
Organisation name Individual name Electronic mail address Role IFREMER
Tarot Stephane
Local service desk