Aquarius Level 3: 7-Day Sea Surface Density Maps from Satellite

Aquarius Level 3 data provides sea surface density estimates at a 1-degree spatial resolution, averaged over 7-day time scales. The dataset is produced by NASA and Argentina's CONAE using radiometer and scatterometer measurements from the AQUARIUS/SAC-D satellite. Version 5.0 data was last updated in March 2026.

Use Cases

• Modeling global ocean circulation patterns based on gridded sea surface density data.
• Analyzing seasonal salinity variations based on 7-day averaged density products.
• Calibrating ocean models using satellite-derived density estimates from the Aquarius instrument.
• Studying surface roughness corrections for salinity retrieval based on the described scatterometer backscatter data.

Strengths

• Data is derived from a dedicated satellite instrument with three radiometers and a scatterometer, providing multiple measurement angles.
• Spatial resolution is 1 degree, with density estimates based on the TEOS-10 standard.
• The dataset represents version 5.0, suggesting iterative processing improvements.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale modeling.
• Data is limited to descending satellite passes, which may not provide full diurnal coverage.

Provenance

Source

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

Collection Method

Satellite remote sensing using the Aquarius instrument's radiometers and scatterometer onboard the AQUARIUS/SAC-D satellite.

Time Range

Averaged over 7-day time scales.

Freshness

Last updated 2026-03-13 14:55:26.034877; freshness should be verified.

Geography

Global ocean coverage, with a total cross-track swath of 370 km.