Aquarius: Seasonal Sea Surface Salinity Climatology from Satellite

Aquarius Level 3 sea surface salinity data provides gridded 1-degree spatial resolution seasonal climatology maps. This version 5.0 product is the official end-of-mission public data release from the NASA-CONAE AQUARIUS/SAC-D satellite, using only measurements from descending orbital passes. The satellite's three radiometers and a scatterometer measured brightness temperature and ocean backscatter at 1.413 GHz and 1.26 GHz to estimate salinity.

Use Cases

• Modeling global ocean circulation and freshwater fluxes based on gridded sea surface salinity maps.
• Studying seasonal and climatological salinity patterns based on the 1-degree resolution seasonal climatology product.
• Calibrating or validating other salinity measurement systems based on the satellite's radiometer and scatterometer data.
• Analyzing the relationship between sea surface salinity and density for climate studies.

Strengths

• Data is the official Version 5.0 end-of-mission public release, representing a finalized product.
• Provides a specific seasonal climatology product, averaging data over consistent time scales.
• Spatial resolution is explicitly defined as 1 degree for the gridded mapped image data.
• Instrument specifications are detailed, including radiometer frequencies (1.413 GHz) and footprint sizes (e.g., 76 km x 94 km).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and dataset size are unknown, which may limit suitability assessment.
• The product uses only data from descending satellite passes, which may not capture diurnal variability.

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

Seasonal climatology, implying multi-year averaging for the final product.

Freshness

Last updated 2026-03-13 14:50:20.553760; freshness should be verified.

Geography

Global ocean coverage within the instrument's 370 km cross-track swath.