# Copernicus Marine SMOS CATDS Qualified L2Q Sea Surface Salinity
*data products*

## Specifications
- **level**: L3
- **distributor**: copernicus-marine-service
- **access endpoint**: https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014/description
- **access model**: open
- **primary data portal url**: https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014/description
- **use cases**: ["SMOS sea surface salinity","Daily L3 salinity monitoring","Rain-corrected salinity analysis"]
- **deployment context**: orbital
- **entity type**: data_product
- **last verified date**: 2026-06-11
- **verified by**: agency-doc
- **claim status**: agency-sourced
- **provider**: copernicus-marine-service
- **attributes**: {"level":"L3","distributor":"copernicus-marine-service","access_endpoint":"https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014/description","access_model":"open","primary_data_portal_url":"https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014/description","use_cases":"[\"SMOS sea surface salinity\",\"Daily L3 salinity monitoring\",\"Rain-corrected salinity analysis\"]","deployment_context":"orbital"}
- **relevance**: in-scope

## Editorial
The Copernicus Marine SMOS CATDS Qualified L2Q Sea Surface Salinity product (ID MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014, DOI 10.48670/mds-00368) is a global L3 sea surface salinity dataset distributed by the Copernicus Marine Service.[^cmems-product-page][^cmems-doi]

The product is derived from SMOS (Soil Moisture and Ocean Salinity) mission observations processed by CATDS (Centre Aval de Traitement des Donnees SMOS) at IFREMER. The CATDS generates qualified L2Q per-orbit SSS swath retrievals from the MIRAS L-band (1.4 GHz) microwave radiometer aboard SMOS; these are then gridded to a daily 0.25-degree global L3 product and quality-filtered to remove contaminated retrievals.[^cmems-product-page] The slug designation L2Q refers to the upstream CATDS qualified L2 input; the distributed Copernicus Marine product is at L3 processing level.

Variables include daily sea surface salinity fields with associated uncertainty estimates and quality flags. Near-real-time (NRT) and multiyear reprocessed (REP) streams are provided. The product is open access via the CMEMS data portal under the Copernicus Marine licence.[^cmems-product-page]

## Compositional position
- ocean-salinity (topics) --[topic_capabilities]--> Copernicus Marine SMOS CATDS Qualified L2Q Sea Surface Salinity

## Sources
- [cmems-product-page] | SMOS CATDS Qualified L2Q Sea Surface Salinity - MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014 | https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014/description | tier=agency-doc | accessed=2026-06-11
- [cmems-doi] | MULTIOBS_GLO_PHY_SSS_L3_MYNRT_015_014 DOI record | https://doi.org/10.48670/mds-00368 | tier=agency-doc | accessed=2026-06-11

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Source: https://eo-atlas.org/data_products/copernicus-marine-smos-catds-l2q-sss
Maintainer: SpectraWorks B.V. (CC-BY 4.0)