IMOS Himawari-8: 4-Hour Sea Surface Temperature for Australasia

IMOS provides a regional GHRSST Level 3 collated dataset of sea surface temperature (SST) on a 0.02-degree grid over the Australasian domain (70E to 190E, 70S to 20N). The Bureau of Meteorology produces this product using SSTskin retrievals from the AHI imager on the Himawari-8 satellite, composited over 4-hour intervals in real-time and delayed mode. The data is compliant with the GHRSST Data Specification version 2.

Use Cases

• Monitoring diurnal and seasonal sea surface temperature cycles based on 4-hourly composited data.
• Validating ocean circulation and climate models based on high-resolution (0.02-degree) SSTskin measurements.
• Studying marine heatwave events in the Australasian region based on reprocessed multi-swath satellite retrievals.

Strengths

• Data is produced in both real-time and reprocessed delayed modes, offering operational and research-grade versions.
• SST retrievals use the Radiative Transfer Model (RTTOV12.3) and a Bayesian cloud clearing method developed at the University of Reading.
• The product is compliant with the international GHRSST Data Specification (GDS) version 2, ensuring interoperability.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment for large-scale statistical modeling.
• The description does not specify the exact temporal coverage of the reprocessed data.

Provenance

Source

Bureau of Meteorology, produced for the Integrated Marine Observing System (IMOS).

Collection Method

SSTskin retrievals from the AHI imager on the Himawari-8 satellite, processed using RTTOV12.3 and a Bayesian cloud clearing method, then composited into 4-hourly products.

Freshness

Last updated 2026-07-10 04:57:18.001704; freshness should be verified.

Geography

Australasian domain (70E to 190E, 70S to 20N).