Methane Anomaly Measurements in Ragay Gulf Waters

Vertical methane distribution data characterizes unusual mid-water and bottom-water plumes, 80 to 100 meters thick, within the Ragay Gulf of the Philippines. The dataset includes average methane supersaturation of 206±16.5% in surface waters and estimated sea-air flux rates. Measurements were collected by the Australian Ocean Data Network and last updated in April 2026.

Use Cases

• Analyze methane concentration anomalies relative to water depth and temperature-depth gradient.
• Model sea-air methane flux using estimated rates of 101 nmole.cm-2.y-1 and wind speed conditions.
• Compare thermogenic methane plume characteristics, persisting over kilometre-scale distances, with biogenic sources.
• Assess methane supersaturation levels, ranging from 178% to 237%, in the top 5 meters of seawater.

Strengths

• Data includes methane measurements from nine distinct sampling locations.
• Provides specific flux estimates and supersaturation percentages with defined ranges.

Limitations

• Unknown sample size (rows) and specific column structure.
• Primary data formats are PDF and HTML, not machine-readable tabular formats.
• Temporal coverage of the measurements is not specified.

Provenance

Source

Australian Ocean Data Network

Collection Method

Vertical distribution measurements of methane in the water column.

Freshness

Last updated in April 2026.

Geography

Ragay Gulf, Philippines archipelago.