Aquarius: Daily Global Sea Surface Density from Satellite Radiometry

Aquarius Level 3 data provides daily, gridded sea surface density at a 1-degree spatial resolution, derived from the final V5.0 mission release. Surface density is calculated using the TEOS-10 standard, combining retrieved salinity from three satellite radiometers at 1.413 GHz with collocated sea surface temperature data. The dataset results from a NASA-CONAE satellite collaboration, using a scatterometer at 1.26 GHz to correct for ocean surface roughness in salinity estimation.

Use Cases

• Monitoring global ocean density stratification based on daily 1-degree gridded data.
• Analyzing seasonal and interannual density variability using the multi-scale (daily, 7-day, monthly) averaged products.
• Validating ocean circulation models with satellite-derived sea surface density estimates.
• Studying the relationship between salinity, temperature, and density using the TEOS-10 based calculations.
• Assessing surface roughness corrections in remote sensing, leveraging the collocated scatterometer backscatter data.

Strengths

• Represents the official end-of-mission public data release (Version 5.0) from the AQUARIUS/SAC-D satellite.
• Provides data at multiple temporal scales: daily, 7-day, monthly, and seasonal averages.
• Derived from a sophisticated instrument suite with three radiometers and a dedicated scatterometer for roughness correction.
• Based on the international TEOS-10 standard for seawater thermodynamic properties.

Limitations

• Key metadata such as row count, file size, and specific column names are unavailable across all platforms.
• A significant conflict exists in the 'last updated' date between platforms (2015 vs. 2026), casting doubt on data maintenance.
• Spatial resolution is 1 degree, which may be too coarse for studying fine-scale oceanographic features.

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 (1.413 GHz) and scatterometer (1.26 GHz), with collocated ancillary SST data.

Time Range

Coverage corresponds to the operational lifetime of the Aquarius mission, though exact dates are not provided.

Freshness

2026-03-13 17:23:07.535081

Geography

Global ocean coverage, with a total instrument swath of approximately 370 km (radiometers) and 390 km (scatterometer).