Aquarius Level 3: Annual Sea Surface Salinity Maps at 1-Degree Resolution

Aquarius Level 3 sea surface salinity data provides gridded annual averages at a 1-degree spatial resolution. This version 5.0 dataset is the official end-of-mission public release from the NASA and CONAE collaborative AQUARIUS/SAC-D satellite mission. The data is derived from three radiometers and a scatterometer measuring brightness temperature and ocean backscatter at L-band frequencies.

Use Cases

• Modeling global ocean circulation and freshwater fluxes based on gridded annual sea surface salinity.
• Studying climate variability and its impact on ocean salinity based on long-term, spatially mapped data.
• Calibrating and validating other satellite or in-situ salinity measurements based on the standard mapped image product.
• Analyzing seasonal to interannual salinity trends in specific ocean basins based on the annual averaged data.

Strengths

• Official end-of-mission public data release (version 5.0), suggesting a finalized and validated product.
• Data is gridded at a consistent 1-degree spatial resolution, facilitating global analysis.
• Derived from a dedicated instrument suite with three radiometers and a scatterometer for roughness correction.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and exact data volume are unknown, which may limit suitability assessment.

Provenance

Source

National Aeronautics and Space Administration (NASA) and Comision Nacional de Actividades Espaciales (CONAE).

Collection Method

Satellite remote sensing via the AQUARIUS/SAC-D mission's radiometers and scatterometer.

Time Range

Annual averages, but specific years of coverage are not stated in the provided metadata.

Freshness

Last updated 2026-03-13 14:51:50.882421; freshness should be verified.

Geography

Global ocean coverage, inferred from the satellite's 370 km cross-track swath.