Aquarius V5.0: Seasonal Sea Surface Salinity

Aquarius Level 3 data provides sea surface salinity mapped at a 1-degree spatial resolution averaged over seasonal time scales. This version 5.0 product is the official end-of-mission release from the NASA/CONAE AQUARIUS/SAC-D satellite, using only descending pass retrievals. The instrument uses three radiometers at 1.413 GHz and a scatterometer at 1.26 GHz to measure brightness temperature and ocean backscatter for salinity estimation.

Use Cases

• Monitoring seasonal changes in global ocean salinity based on gridded 1-degree resolution maps.
• Studying ocean circulation and freshwater fluxes using satellite-derived sea surface salinity data.
• Validating and improving ocean models with spatially averaged salinity observations from descending satellite passes.
• Analyzing the relationship between surface roughness and salinity using scatterometer backscatter correction data.

Strengths

• Represents the official end-of-mission public data release (version 5.0) from a collaborative NASA and CONAE satellite mission.
• Provides specific instrument details: three radiometers at 29°, 38°, and 46° incidence angles with footprints ranging from 76x94 km to 96x156 km.
• Data is processed to a standardized 1-degree gridded format, facilitating global analysis and comparison.

Limitations

• Metadata completeness is low: column names, row counts, and exact file sizes are unknown across all platforms.
• The dataset appears static (end-of-mission release), but update dates conflict: one source lists 2026-03-13 while another lists 2015-06-07.
• The product uses only retrieved values from descending satellite passes, which may limit temporal coverage or introduce sampling bias.

Provenance

Source

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

Collection Method

Satellite remote sensing from the AQUARIUS/SAC-D instrument, consisting of radiometers and a scatterometer.

Freshness

2026-03-13 17:15:54.420845

Geography

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