Terra MODIS GSM: Global Mapped Ocean Optical Properties
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Description
Global ocean-color fields derived from Terra MODIS satellite data using the Garver-Siegel-Maritorena (GSM) semi-analytical model. The dataset provides multiple optical properties, including absorption by gelbstoff and detrital material, particulate backscattering, and chlorophyll-a concentration. It is produced by OB_CLOUD and represents version 2022.0.
Use Cases
Modeling phytoplankton biomass based on retrieved chlorophyll-a concentration (chl_gsm).
Studying dissolved organic matter dynamics based on absorption by gelbstoff and detrital material (adg_443_gsm).
Analyzing water clarity and particle loads based on particulate backscattering (bbp_443_gsm).
Comparing semi-analytical model retrievals against simple band-ratio algorithms for ocean color.
Strengths
Provides three key geophysical variables (adg_443_gsm, bbp_443_gsm, chl_gsm) for ocean analysis.
Uses a physics-based semi-analytical model (GSM) that retrieves multiple properties simultaneously.
Data is derived from the established Terra MODIS satellite sensor.
Limitations
Column-level documentation is absent; field semantics must be inferred after download.
Row count, file formats, and sample data are unknown, which may limit suitability assessment.
Last update date is unknown; freshness unverified.
Provenance
Source
nasa_earthdata
Collection Method
Derived by inverting water-leaving reflectance from the Terra MODIS satellite with the Garver-Siegel-Maritorena (GSM) model.
Time Range
Version 2022.0 is specified, but temporal coverage is not detailed.
Freshness
Version 2022.0 is specified, but the last update date is unknown.