RAMSSA: Daily Sea Surface Temperature Analysis for the Australian Region

Daily Level 4 sea surface temperature analysis produced operationally by the Australian Bureau of Meteorology. The Regional Australian Multi-Sensor SST Analysis (RAMSSA) v1.0 system blends infrared and microwave satellite observations with in situ data from ships and buoys on a 1/12-degree grid over the Australian region (20N - 70S, 60E - 170W). Observations are filtered to remove diurnal warming effects, resulting in daily foundation SST estimates.

Use Cases

• Modeling ocean-atmosphere interactions based on daily foundation sea surface temperature estimates.
• Analyzing regional climate trends based on a multi-sensor satellite and in situ data blend.
• Validating oceanographic models using a gridded analysis product filtered for diurnal warming.

Strengths

• Daily operational production suggests consistent temporal coverage.
• Data fusion from multiple satellite sensors (AVHRR, AMSR-2) and in situ sources (ships, buoys).
• Spatial analysis on a 1/12-degree grid over a defined region (20N - 70S, 60E - 170W).
• Processing includes filtering for diurnal warming using wind speed thresholds (below 6 m/s day, less than 2 m/s night).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Freshness should be verified despite the listed last update date of 2026-07-10.

Provenance

Source

Australian Bureau of Meteorology, part of the International Group for High Resolution Sea Surface Temperature (GHRSST).

Collection Method

Optimal interpolation (OI) blending infrared SST from AVHRR (NOAA, METOP), microwave SST from AMSR-2 (GCOM-W), and in situ data from the Global Telecommunications System (GTS).

Freshness

Produced daily on an operational basis.

Geography

Australian region (20N - 70S, 60E - 170W).