Aqua MODIS SST4: Near Real-Time Sea Surface Temperature

Global ocean data provides sea surface temperature retrieved from mid-wave infrared bands (∼3.7–4.1 µm), specifically designed for use at night to avoid solar contamination. The dataset is produced by NASA's Ocean Biology DAAC as a near real-time (NRT) product, offering a snapshot from a single satellite orbit with reduced sensitivity to atmospheric water vapor compared to long-wave methods. It includes geophysical variables for temperature, bias, quality flags, and standard deviation.

Use Cases

• Monitoring tropical ocean heat content based on SST4 measurements.
• Assessing near real-time oceanic conditions for operational forecasting using NRT snapshots.
• Validating atmospheric correction models using the bias_sst4 and stdv_sst4 variables.
• Flagging low-quality data for analysis using the qual_sst4 and l2_flags integer bitmasks.
• Comparing satellite-derived SST with reference models using the sstref field.

Strengths

• Data is produced by the National Aeronautics and Space Administration, a highly authoritative source.
• Cross-platform presence on datagov and nasa_earthdata signals established importance and reuse.
• Includes multiple quality control variables (flags, quality levels, standard deviation) for informed analysis.

Limitations

• Near real-time products use less-than-optimal ancillary data and calibration, as stated in the description.
• Critical metadata such as row count, size, and specific license are conflicting or missing across sources.
• The dataset's temporal and geographic scope must be inferred from descriptions and is not explicitly stated.

Provenance

Source

National Aeronautics and Space Administration, Ocean Biology DAAC.

Collection Method

Satellite remote sensing data from the Aqua MODIS instrument, processed to Level-2.

Freshness

Last updated on datagov: 2026-03-13.

Geography

Global.