Title

CATDS-PDC L3OS 2Q - Debiased daily valid ocean salinity values product from SMOS satellite

Date (Publication)

2022-02-14

Date

Citation identifier

CATDS-PDC_L3OS_2Q

Citation identifier

DOI:10.12770/12dba510-cd71-4d4f-9fc1-9cc027d128b0

Abstract

This product is an intermediate product, that provides, in daily files, SSS corrected from land-sea contamination and latitudinal bias. Ascending and descending orbits are processed separately

Credit

CATDS (CNES, IFREMER, LOCEAN, ACRI)

Point of contact

Organisation name	Individual name	Electronic mail address	Role
CATDS		support@catds.fr	Author
LOCEAN	Jacqueline Boutin	jb@locean-ipsl.upmc.fr	Principal investigator
CATDS (CNES, IFREMER, LOCEAN, ACRI)		support@catds.fr	Publisher
ACRI	Jean-Luc Vergely	jean-luc.vergely@latmos.ipsl.fr	Principal investigator

Thèmes Sextant

• /Imagery/Satellite Imagery

GEMET - INSPIRE themes, version 1.0

• Orthoimagery

Theme

• SMOS

• CATDS

• CPDC

• L3OS

• Ocean Salinity

• 2Q

• Ocean Product

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

2010-01-12

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/L3OS/RE07/MIR_CSF2QA	RE07-ASC
WWW:DOWNLOAD-1.0-link--download	https://data.catds.fr/cpdc/Ocean_products/GRIDDED/L3OS/RE07/MIR_CSF2QD	RE07-DESC
WWW:DOWNLOAD-1.0-link--download	https://data.catds.fr/cpdc/Ocean_products/GRIDDED/L3OS/OPER/MIR_CSF2QA	OPER-ASC
WWW:DOWNLOAD-1.0-link--download	https://data.catds.fr/cpdc/Ocean_products/GRIDDED/L3OS/OPER/MIR_CSF2QD	OPER-DESC
WWW:LINK	https://doi.org/10.13155/92266	ATBD L3/L4 OS
WWW:LINK	http://www.catds.fr/content/download/68781/908673	Pros/cons table
WWW:LINK-1.0-http--publication-URL	http://doi.org/10.1016/j.rse.2018.05.022	Reference
WWW:DOWNLOAD-1.0-link--download	ftp://ftp.ifremer.fr/	FTP Access

OnLine resource

Protocol	Linkage	Name
WWW:LINK	https://www.catds.fr/sipad/	CATDS Sipad
WWW:LINK	https://www.catds.fr/	CATDS Web portal

OnLine resource

Protocol	Linkage	Name
WWW:LINK-1.0-http--metadata-URL	https://doi.org/10.12770/12dba510-cd71-4d4f-9fc1-9cc027d128b0

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 qualified L3OS 2Q product is an intermediate product, that provides, in daily files, SSS corrected from land-sea contamination and latitudinal bias. Ascending and descending orbits are processed separately.

Products from reprocessing RE07 are available for the period 01/2010 - 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 5 days (Please see below for alternative 1-day delay products).

File naming:

SM_clas_MIR_CSF2Qx_startdate_enddate_vvv_ccc_7

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

- x : A for ascending orbit, D for descending orbit

- 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)

Alternative 1-day delay products:

Since 07/2019, 1-day delay products are also available, in operational (OPER) processing only.

These products are only available by FTP (i.e. not by Sipad). The paths and file names are identical, except that the "MIR" tags are replaced by "NRT".

Simplified version:

This product is also available on Copernicus Marine Service as product MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014.

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

CATDS_CSF2Qx_startdate_enddate_vvv_p.nc

- x : A for ascending orbit, D for descending orbit

- 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: 1 for NRT (1-day delay), 2 for regular (5-day delay), 3 for reprocessed.

Reference :

Boutin J., Vergely J.L., Marchand S., D'Amico F., Hasson A., Kolodziejczyk Nicolas, Reul Nicolas, Reverdin G., Vialard J. (2018). New SMOS Sea Surface Salinity with reduced systematic errors and improved variability. Remote Sensing of Environment, 214, 115-134. Publisher's official version : http://doi.org/10.1016/j.rse.2018.05.022 , Open Access version : http://archimer.ifremer.fr/doc/00441/55254/

Metadata

File identifier

12dba510-cd71-4d4f-9fc1-9cc027d128b0

Metadata language

English

Character set

UTF8

Hierarchy level

Dataset

Date stamp

2025-01-28T08:44:01.250152Z

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	Stephane.Tarot@ifremer.fr	Local service desk