# Copernicus Marine Global L4 Sea Surface Salinity and Density
*data products*

## Specifications
- **level**: L4
- **distributor**: copernicus-marine-service
- **access endpoint**: https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_S_SURFACE_MYNRT_015_013/description
- **access model**: open
- **primary data portal url**: https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_S_SURFACE_MYNRT_015_013/description
- **use cases**: ["Gap-free sea surface salinity analysis","Sea surface density","Ocean freshwater monitoring"]
- **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":"L4","distributor":"copernicus-marine-service","access_endpoint":"https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_S_SURFACE_MYNRT_015_013/description","access_model":"open","primary_data_portal_url":"https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_S_SURFACE_MYNRT_015_013/description","use_cases":"[\"Gap-free sea surface salinity analysis\",\"Sea surface density\",\"Ocean freshwater monitoring\"]","deployment_context":"orbital"}
- **relevance**: in-scope

## Editorial
The Copernicus Marine Global L4 Sea Surface Salinity and Density product (ID MULTIOBS_GLO_PHY_S_SURFACE_MYNRT_015_013) provides daily, globally gap-free L4 analyses of sea surface salinity (SSS) and sea surface density (SSD), distributed by the Copernicus Marine Service.[^cmems-sss-desc]

The product is produced by the Consiglio Nazionale delle Ricerche (CNR), Italy. It is generated by merging L-band satellite SSS retrievals from SMOS and SMAP with Argo float near-surface salinity profiles, applying an optimal interpolation approach to produce a complete spatial field at each daily time step.[^cmems-sss-desc] The 0.125 x 0.125 degrees global grid spans the full ocean surface and is available in near-real-time (NRT) and multiyear reprocessed (REP) streams.

Sea surface density is derived directly from the SSS and collocated sea surface temperature fields. Both variables are provided in a single NetCDF file per time step. The product is freely accessible under the Copernicus Marine open-data licence via the CMEMS data portal.[^cmems-sss-desc]

## Compositional position
- ocean-salinity (topics) --[topic_capabilities]--> Copernicus Marine Global L4 Sea Surface Salinity and Density

## Sources
- [cmems-sss-desc] | Copernicus Marine Global L4 Sea Surface Salinity and Density - product description | https://data.marine.copernicus.eu/product/MULTIOBS_GLO_PHY_S_SURFACE_MYNRT_015_013/description | tier=agency-doc | accessed=2026-06-11

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Source: https://eo-atlas.org/data_products/copernicus-marine-l4-sea-surface-salinity-density
Maintainer: SpectraWorks B.V. (CC-BY 4.0)