GHRSST Level 4 DMI_OI: Global Daily Sea Surface Temperature Analysis at 0.05° Grid

A daily global sea surface temperature analysis produced operationally by the Danish Meteorological Institute using an optimal interpolation method. The analysis combines nighttime skin and subskin temperature observations from five satellite sensors, including AVHRR, SEVIRI, AMSR2, VIIRS, and MODIS on Aqua, and masks ice areas using the EUMETSAT OSI-SAF ice field. This dataset follows the GHRSST Data Processing Specification version 2 and is provided on a 0.05-degree grid.

Use Cases

• Modeling ocean heat content and climate patterns based on the daily, global 0.05-degree gridded analysis.
• Validating satellite sensor performance based on the multi-sensor fusion of AVHRR, SEVIRI, AMSR2, VIIRS, and MODIS data.
• Studying diurnal warming cycles based on the use of nighttime-only skin and subskin temperature observations.
• Analyzing polar and sub-polar ocean dynamics based on the inclusion of an ice mask from the EUMETSAT OSI-SAF.

Strengths

• Integrates data from five distinct satellite sensor systems, likely improving spatial and temporal coverage.
• Produced on a daily operational basis, suggesting regular updates and consistency.
• Adheres to the standardized GHRSST Data Processing Specification version 2.
• Uses an optimal interpolation approach on a global 0.05-degree grid, suggesting a structured, high-resolution product.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count and total file size are unknown, which may limit suitability assessment for large-scale projects.

Provenance

Source

Danish Meteorological Institute (DMI), distributed via NASA.

Collection Method

Optimal interpolation (OI) of nighttime GHRSST L2P skin and subskin SST observations from multiple satellites.

Time Range

Daily production suggests ongoing temporal coverage, but specific start date is unknown.

Freshness

Last updated 2026-03-13 02:32:59.209643; freshness should be verified.

Geography

Global coverage on a 0.05-degree grid.