Heard Island Sea Level Data from Two Methods, 2025-2026 Antarctic Season

Water level measurements from two locations at Heard Island between 19 October 2025 and 18 January 2026. Data was collected using a seabed pressure sensor in Atlas Cove and a GNSS interferometric reflectometry system at Magnet Point, approximately 7 kilometers apart. This dataset is a collaborative effort between the Australian Antarctic Data Centre, the Royal Australian Navy, and the Southern Ocean Sea Level Monitoring Project.

Use Cases

• Calibrating satellite sea level altimetry based on in-situ pressure and GNSS-IR measurements.
• Studying local tidal and wave dynamics in Atlas Cove based on high-frequency bottom pressure data.
• Validating GNSS interferometric reflectometry (GNSS-IR) methods for coastal sea level retrieval.
• Analyzing atmospheric pressure effects on sea surface height derived from the co-located weather station.

Strengths

• Covers a specific 92-day period during the 2025/26 Antarctic season.
• Includes data from two distinct measurement methods (pressure sensor and GNSS-IR) separated by 7 kilometers.
• Atmospheric pressure data from a co-located Automatic Weather Station is incorporated for processing.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data is provided in PNG and HTML formats, which may not be standard for time-series analysis.

Provenance

Source

Australian Ocean Data Network via data_gov_au.

Collection Method

Method 1: Pressure sensor on a seabed frame. Method 2: GNSS data processed with GNSS interferometric reflectometry (GNSS-IR).

Time Range

19 October 2025 to 18 January 2026 (inclusive).

Freshness

Last updated 2026-06-04 07:19:57.533178; freshness should be verified

Geography

Heard Island, specifically Atlas Cove and Magnet Point.