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, expressed in moles of photons per square meter. It is produced by NASA's PACE mission and used to estimate marine primary production and support ecosystem models.
Use Cases
- Estimating marine primary production based on photosynthetically available radiation (PAR) data.
- Interpreting phytoplankton bloom dynamics based on light availability measurements.
- Providing context for optical and biogeochemical measurements with satellite-derived PAR estimates.
- Supporting ecosystem models and educational resources on light–biology interactions in the ocean.
Strengths
- Provides estimates for a specific, biologically relevant light spectrum (400–700 nm).
- Includes both daily (par) and instantaneous (ipar) radiation measurements.
- Contains Level-2 processing flags (l2_flags) for data quality assessment.
Limitations
- Row count and dataset size are unknown, which may limit suitability assessment.
- Column-level documentation is absent; field semantics must be inferred after download.
- Last update date is unknown; freshness unverified.
Provenance
- Source
- NASA's PACE (Plankton, Aerosol, Cloud, ocean Ecosystem) mission via the nasa_earthdata platform.
- Collection Method
- Satellite remote sensing.
- Geography
- Regional ocean coverage (specific regions not specified).