PACE OCI Level-3 PAR: Global Ocean Photosynthetically Available Radiation

Global satellite-derived estimates of downwelling solar radiation in the 400–700 nm range available for photosynthesis at the ocean surface. The data suite quantifies daily or instantaneous usable light energy in moles of photons per square meter, produced by NASA's PACE mission. It is used to estimate marine primary production and interpret phytoplankton bloom dynamics.

Use Cases

• Estimate marine primary production based on photosynthetically available radiation (PAR) data.
• Interpret phytoplankton bloom dynamics using satellite-based light energy estimates.
• Provide context for optical and biogeochemical measurements with surface PAR data.
• Support ecosystem models with daily or instantaneous usable light energy inputs.

Strengths

• Provides satellite-based estimates of a key biophysical variable (PAR).
• Covers the global ocean surface.
• Quantifies energy in the specific 400–700 nm range relevant for photosynthesis.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Last update date is unknown; freshness unverified.

Provenance

Source

NASA PACE OCI instrument, via nasa_earthdata platform.

Collection Method

Satellite remote sensing.

Geography

Global ocean surface.