IMOS Satellite Altimetry Calibration and Validation Data for Ocean Climate Studies

The IMOS Satellite Altimeter Calibration and Validation Sub-Facility provides in situ oceanographic measurements for validating satellite altimeters. Data includes sea surface height, significant wave height, bottom pressure, temperature, salinity, and water currents from sites in Bass Strait, the Southern Ocean, and the Great Barrier Reef. The facility has operated since 1992, contributing to missions like TOPEX/Poseidon, Sentinel-6, Sentinel-3, and SWOT.

Use Cases

• Validate satellite altimeter absolute bias based on in situ sea surface height measurements.
• Analyze ocean dynamic processes at regional scales based on water current and sea surface height data.
• Calibrate nadir altimeters for climate studies based on long-term, sustained sea surface height records.
• Study wave climate and its interaction with sea level based on significant wave height measurements.

Strengths

• Provides the only southern hemisphere in situ calibration and validation site for satellite altimetry, operational since 1992.
• Includes a suite of complementary oceanographic variables: sea surface height, significant wave height, bottom pressure, temperature, salinity, and water currents.
• Data contributes to validation teams for major satellite missions including Sentinel-6 Michael Freilich, Sentinel-3, and SWOT.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Temporal extents and sampling rates vary by site and deployment, complicating uniform analysis.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

Australian Ocean Data Network via IMOS (Integrated Marine Observing System).

Collection Method

Data collected via GNSS-equipped buoys and sub-surface moored instrumentation including temperature, pressure, salinity sensors and ADCPs.

Time Range

Data collection likely spans from 1992 to present, with temporal extents varying by site.

Freshness

Last updated 2026-07-10 19:25:15.230612; freshness should be verified.

Geography

Primary site in Bass Strait, with additional sites at the Southern Ocean Flux Station (SOFS), Davies Reef, and Yongala in the Great Barrier Reef region.