GHRSST Level 4 AVHRR_OI Global Blended Sea Surface Temperature Analysis (GDS2) from NCEI

A GHRSST Level 4 sea surface temperature dataset is produced daily on a 0.25-degree global grid by NOAA National Centers for Environmental Information. It uses optimal interpolation to blend satellite (AVHRR) and in-situ observations from ships, buoys, and Argo floats. The v2.1 version includes major improvements for data after January 1, 2016, such as enhanced in-situ data sources and revised bias corrections.

Use Cases

• Modeling global ocean heat uptake and climate change indicators based on the daily, interpolated sea surface temperature fields.
• Validating satellite sea surface temperature retrievals using the integrated in-situ data from ships, buoys, and Argo floats.
• Studying Arctic warming and sea-ice interactions based on the revised sea-ice-concentration to SST conversion designed to remove warm biases.
• Assessing diurnal to seasonal SST variability using the near-real-time preliminary data with 1-day latency.
• Correcting historical satellite SST biases in reanalysis projects using the updated in-situ data ingest planned for pre-2016 records.

Strengths

• Daily production on a consistent 0.25-degree global grid provides regular temporal coverage.
• Version 2.1 incorporates major improvements including large increases of buoy data and addition of Argo float data for bias correction.
• Data sources are explicitly listed as satellite (AVHRR) and in-situ platforms (ships, buoys, Argo floats).
• Includes a near-real-time preliminary version with 1-day latency, followed by a final version after 2 weeks.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Improvements in version 2.1 only apply to data after January 1, 2016; pre-2016 data remains from the previous version.
• Row count and dataset size are unknown, which may limit suitability assessment.

Provenance

Source

NOAA National Centers for Environmental Information (NCEI).

Collection Method

Optimal interpolation (OI) of satellite (AVHRR) and in-situ (ships, buoys, Argo floats) observations.

Time Range

Data from 1982 onward, with a planned update for the entire period.

Freshness

Last updated 2026-03-13 02:32:49.373092; freshness should be verified.

Geography

Global coverage on a 0.25-degree grid.