Sub-Antarctic Acoustic Travel Time Measurements from 1995-1997

Inverted echo sounder data were collected south of Australia from March 1995 to March 1997 as part of the Sub-Antarctic Flux and Dynamics Experiment (SAFDE). The dataset includes both highest-quality processed versions and low-pass filtered, calibrated versions for combined analysis. Data collection was supported by National Science Foundation grants and processed by NOAA NCEI.

Use Cases

• Analyze temporal variations in acoustic travel time to infer changes in ocean temperature and current structure.
• Calibrate low-pass filtered IES data to a common pressure level for integrated analysis with other oceanographic measurements.
• Study Sub-Antarctic flux and dynamics by correlating processed echo sounder records with regional atmospheric forcing.
• Validate ocean acoustic tomography models using the high-quality, minimally processed IES data versions.

Strengths

• Two-year continuous measurement period from March 1995 to March 1997.
• Includes both minimally processed and calibrated, filtered data versions for different analytical needs.

Limitations

• Data is over 25 years old, limiting relevance for studying recent oceanographic changes.
• Specific sample size, geographic coordinates, and sensor resolution details are unknown.

Provenance

Source

NOAA National Centers for Environmental Information (NCEI) under accession 0157074.

Collection Method

Data collected using inverted echo sounders (IES) deployed south of Australia.

Time Range

March 1995 to March 1997.

Freshness

Data collection ended in March 1997; no updates are expected.

Geography

Southern Ocean region south of Australia.