IMOS MODIS Chlorophyll-a Concentration via GSM Model

The Aqua satellite's MODIS sensor provides multi-spectral measurements of reflected sunlight from the ocean surface layer. These data use the Garver-Siegel-Maritorena (GSM) algorithm to infer chlorophyll-a concentration, primarily from phytoplankton. Production of contemporary MODIS data ceased on 2024-12-26, with users directed to VIIRS instruments for newer data.

Use Cases

• Monitoring phytoplankton bloom dynamics based on chlorophyll-a concentration estimates.
• Studying ocean primary productivity patterns using satellite-derived ocean color data.
• Validating biogeochemical models with remotely sensed chlorophyll-a data from the GSM algorithm.
• Assessing long-term trends in marine ecosystem health based on time-series chlorophyll observations.

Strengths

• Data is derived from the MODIS sensor on the well-established Aqua satellite platform.
• Uses the specific Garver-Siegel-Maritorena (GSM) retrieval algorithm, implemented in SeaDAS software.
• Processing is documented in the referenced IOCCG Report 5 from 2006.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data collection ceased on 2024-12-26, limiting temporal coverage for contemporary analysis.

Provenance

Source

Australian Ocean Data Network (via data.gov.au), sourced from the Integrated Marine Observing System (IMOS).

Collection Method

Satellite remote sensing via the MODIS sensor on the Aqua platform, processed with the GSM algorithm in SeaDAS.

Time Range

Coverage until 2024-12-26.

Freshness

Last updated 2026-07-10 03:29:58.165739; freshness should be verified.

Geography

Likely covers ocean areas observable by the Aqua satellite, specific regions not stated.