SMOS SSS L3 maps generated by CATDS CEC LOCEAN. debias V4.0

Date 2019-12
Temporal extent 2010-01-16 -2019-09-30
Author(s) Boutin JacquelineORCID1, Vergely Jean-Luc2, Thouvenin-Masson Clovis, Supply Alexandre, Khvorostyanov Dmitry1
Affiliation(s) 1 : Sorbonne Universite, LOCEAN UMR 7159 UPMC CNRS IRD MNHN, F-75005 PARIS, France
2 : ACRI-st, Guyancourt, France
DOI 10.17882/52804
Publisher SEANOE
Keyword(s) SMOS, Salinity, Satellite, Remote Sensing
Abstract

LOCEAN and ACRI-st work as Ocean Salinity Center of Expertise for CATDS (CATDS CEC-OS) in order to improve methodologies to be implemented in the future in the near real time CATDS processing chain (CATDS-CPDC). They have derived a methodology for correcting systematic SSS biases. Feedbacks from users about the quality of these new products are very welcome, as they are experimental.

This fourth version of Level 3 SMOS SSS corrected from systematic biases uses an improved ‘de-biasing’ technique: with respect to version 2 (see a full description of the method in Boutin et al. RSE  2018) and 3, it covers the global ocean, the adjustment of the long term mean SMOS SSS in very dynamical areas, like in river plumes, and the bias correction at high latitudes have been improved.

The successive evolutions of the corrections are recalled below:

V4      

Main evolutions : V3 + wind speed limited to 16m/s, Acard filtering, update of SST correction in cold waters, refined absolute correction    

Main improvements : Decrease of mean bias over the open ocean,  improved ice filtering, improved SSS at high latitudes (especially in the Southern Ocean)

V3

Main evolutions: V2 + SSS natural variability varying seasonally; latitudinal bias correction applied everywhere; SSS correction at low SST; improved absolute correction

Main improvements: V2 +  improved adjustment of land-sea biases close to coast; adjustment of high latitudinal biases

Corresponding CATDS Near Real time products: In development (to be released soon; global ocean coverage)

V2

Main evolutions: V1 + SSS natural variability varying spatially; no latitudinal bias correction outside 47S-47N

Main improvements: V1 + improved land-sea contamination in very dynamic areas

Reference: Boutin et al., 2018, RSE

Corresponding CATDS Near Real time products: L3Q products (RE05 and real time CPDC processings; limited to 47°N-47°S)

V1

Main evolutions: V0 + seasonal latitudinal correction (same SSS natural variability everywhere)

Main improvements: V0+ Reduced latitudinal biases

Corresponding CATDS Near Real time products: No

V0

Main improvements: Reduced land-sea contamination

Reference: Kolodziejczyk et al., 2016

Corresponding CATDS Near Real time products: No

Licence CC-BY-NC-ND
Utilisation In order to propose improved methodologies to be implemented in future CATDS-CPDC versions, LOCEAN/IPSL (UMR CNRS/UPMC/IRD/MNHN) and ACRI-st have derived a methodology for correcting systematic SSS biases. The fourth version uses an improved debiasing technique that is also implemented in the CATDS CPDC processing; only maps generation (filtering and smoothing) and geographical coverage differ from CATDS CPDC version. We welcome feedbacks from users about the quality of these new products, as they are experimental. The CATDS data are freely distributed. However, when using these data in a publication, we request that the following acknowledgement to be given.
Acknowledgments The L3_DEBIAS_LOCEAN_v4 Sea Surface Salinity maps have been produced by LOCEAN/IPSL (UMR CNRS/SU/IRD/MNHN) laboratory and ACRI-st company that participate to the Ocean Salinity Expertise Center (CEC-OS) of Centre Aval de Traitement des Donnees SMOS (CATDS). This product is distributed by the Ocean Salinity Expertise Center (CEC-OS) of the CNES-IFREMER Centre Aval de Traitemenent des Donnees SMOS (CATDS), at IFREMER, Plouzane (France).
User's manual

Detailed description of the dataset

Sensor metadata

Soil Moisture and Ocean Salinity (SMOS) satellite mission

Data

Data and documentation also available from CEC-OS

Data
File Size Format Processing Access Key
3 GB NC, NetCDF Processed data Access on demand 54823
3 GB NC, NetCDF Processed data Access on demand 54961
3 GB NC, NetCDF Processed data Access on demand 57467
V4.0 4 GB NC, NetCDF Quality controlled data Open access 69293
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How to cite 

Boutin Jacqueline, Vergely Jean-Luc, Thouvenin-Masson Clovis, Supply Alexandre, Khvorostyanov Dmitry (2019). SMOS SSS L3 maps generated by CATDS CEC LOCEAN. debias V4.0. SEANOE. https://doi.org/10.17882/52804


In addition to properly cite this dataset, it would be appreciated that the following work(s) be cited too, when using this dataset in a publication :


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 : https://doi.org/10.1016/j.rse.2018.05.022 , Open Access version : https://archimer.ifremer.fr/doc/00441/55254/