GSM model data provides three key geophysical variables for global ocean surfaces derived from ENVISAT MERIS satellite reflectance measurements. The dataset offers a physics-based alternative to simple band-ratio chlorophyll algorithms by simultaneously retrieving multiple optical properties. It was last updated in May 2012 by the organization OB_CLOUD.
Use Cases
- Model phytoplankton biomass distribution by analyzing the global chl_gsm (Chlorophyll-a concentration) field.
- Study dissolved organic material by mapping adg_443_gsm (Absorption by gelbstoff and detrital material) spatial and temporal patterns.
- Investigate particulate scattering dynamics using the bbp_443_gsm (Particulate backscattering) variable.
- Validate semi-analytical ocean color inversion models by comparing the three simultaneous GSM retrievals against in-situ measurements.
- Analyze seasonal cycles in marine optical properties by examining time-series of the provided GSM variables.
Strengths
- Provides three core, simultaneously retrieved optical variables for each observation point.
- Offers a physics-based retrieval method (GSM model) as an alternative to empirical algorithms.
- Data is derived from the ENVISAT MERIS instrument, a major satellite mission for ocean color.
Limitations
- Data recency is low, with the last update recorded in 2012, limiting analysis of recent ocean states.
- Specific spatial resolution, temporal coverage, and data volume (rows/size) are unknown from the input.
Provenance
- Source
- NASA Earthdata (platform), organization OB_CLOUD.
- Collection Method
- Derived by inverting water-leaving reflectance from the ENVISAT MERIS instrument using the Garver-Siegel-Maritorena (GSM) semi-analytical model.
- Time Range
- null
- Freshness
- Last updated 2012-05-09; update frequency is null.
- Geography
- Global ocean coverage.