Aqua MODIS IOP: Global Mapped Ocean Optical Properties, Near Real-time

NASA's Ocean Biology DAAC produces near real-time (NRT) Level-3 mapped data of inherent optical properties (IOPs) from the Aqua MODIS satellite. The dataset includes geophysical variables like total absorption and backscattering coefficients, derived using the Generalized Inherent Optical Properties (GIOP) model framework. These products provide a snapshot of ocean conditions within a single orbit, supporting water-type classification and biogeochemical studies.

Use Cases

• Water-type classification based on inherent optical properties like absorption and backscattering coefficients.
• Water-clarity assessment using the total absorption and particulate backscattering coefficients.
• Biogeochemical studies leveraging phytoplankton absorption and CDOM/detritus absorption coefficients.
• Cross-sensor comparison for satellite ocean color data using IOPs, which are more robust than apparent optical properties.

Strengths

• Provides near real-time (NRT) data, offering a snapshot of ocean conditions within a single orbit.
• Includes multiple derived geophysical variables, such as total absorption (a), total backscattering (bb), and component-specific coefficients.
• Supports multiple applications including water-type classification, clarity assessment, and biogeochemical studies as stated in the description.

Limitations

• Description metadata is limited; actual data quality requires manual inspection after download.
• The inputs and calibration used for NRT products are described as 'less than optimal'.
• Row count, file formats, and column-level documentation are unknown, which may limit suitability assessment.

Provenance

Source

NASA Ocean Biology DAAC (OB_CLOUD), from Aqua MODIS satellite.

Collection Method

Derived from spectral Remote Sensing Reflectance (Rrs) using the Generalized Inherent Optical Properties (GIOP) model framework.

Freshness

Near real-time (NRT); version 2022.0.

Geography

Global