IMOS MODIS: Daily Chlorophyll-a Concentration from Ocean Color Satellite

The Aqua satellite's MODIS sensor provides multi-spectral measurements of sunlight reflected from the ocean surface layer. These data use the OC3 algorithm to infer chlorophyll-a concentration, a proxy for phytoplankton biomass. Production of contemporary MODIS data ceased on 2024-12-26, with users directed to VIIRS instruments for newer data.

Use Cases

• Modeling phytoplankton bloom dynamics based on chlorophyll-a concentration.
• Monitoring long-term trends in ocean productivity based on satellite-derived ocean color.
• Validating biogeochemical ocean models based on spatially extensive remote sensing data.
• Assessing water quality and marine ecosystem health based on inferred phytoplankton presence.

Strengths

• Data uses the OC3 algorithm recommended by NASA's Ocean Biology Processing Group.
• Provides daily temporal resolution for monitoring rapid changes.
• Data production is explicitly documented as ceasing on 2024-12-26, providing a clear historical endpoint.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• Data may reflect geographic or temporal bias inherent to the satellite's coverage and the data_gov_au source.

Provenance

Source

Australian Ocean Data Network (AODN) via the Integrated Marine Observing System (IMOS).

Collection Method

Satellite remote sensing from the MODIS sensor on NASA's Aqua platform, processed with the SeaDAS l2gen software using the OC3 algorithm.

Time Range

Data production ceased on 2024-12-26; specific start date is not provided.

Freshness

Last updated 2026-07-13 20:48:54.894686; freshness should be verified as data production ceased in 2024.

Geography

Likely covers ocean areas observable by the Aqua satellite's MODIS sensor, but specific spatial coverage is not detailed.