Aquarius V5.0: Annual Descending Pass Sea Surface Salinity Gridded Data

Aquarius Level 3 data provides global sea surface salinity measurements at a 1-degree spatial resolution, averaged annually from satellite descending passes. This version 5.0 product is a collaborative effort between NASA and Argentina's CONAE, using a satellite instrument with three radiometers and a scatterometer for surface roughness corrections. The data is rain-flagged, meaning precipitation effects on salinity retrieval are identified.

Use Cases

• Modeling global ocean salinity patterns and freshwater fluxes based on gridded annual averages.
• Studying the impact of rainfall on sea surface salinity retrieval using the rain-flagged data feature.
• Calibrating other salinity measurement systems against this satellite-derived standard mapped image data.
• Analyzing long-term trends in ocean salinity for climate change studies based on annual time scales.

Strengths

• Data is derived from a dedicated satellite instrument (Aquarius/SAC-D) with three radiometers and a scatterometer for correction.
• Provides salinity at a standardized 1-degree spatial resolution, facilitating global analysis.
• Product is rain-flagged, which helps identify and account for precipitation interference.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• Column-level documentation is absent; field semantics must be inferred after download.
• The dataset is specific to descending satellite passes, excluding ascending pass data.

Provenance

Source

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

Collection Method

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

Time Range

Annual averages.

Freshness

Last updated 2026-03-13 14:58:59.651462; freshness should be verified.

Geography

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