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IMOS - Satellite Remote Sensing - MODIS - 01 day - Net Primary Productivity (OC3 model and Eppley-VGPM algorithm)

Created 23/06/2025

Updated 23/06/2025

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The Aqua satellite platform carries a MODIS sensor that observes sunlight reflected from within the ocean surface layer at multiple wavelengths. These multi-spectral measurements are used to infer the concentration of chlorophyll-a (Chl-a), most typically due to phytoplankton, present in the water. Modelling is then used to compute an estimate of the Net Primary Productivity (NPP). The model used is based on the standard vertically generalised production model (VGPM). The VGPM is a "chlorophyll-based" model that estimates net primary production from chlorophyll using a temperature-dependent description of chlorophyll-specific photosynthetic efficiency. For the VGPM, net primary production is a function of chlorophyll, available light, and the photosynthetic efficiency. The only difference between the Standard VGPM and the Eppley-VGPM is the temperature-dependent description of photosynthetic efficiencies, with the Eppley approach using an exponential function to account for variation in photosynthetic efficiencies due to photoacclimation. The similarity between these models (VGPM vs E_VGPM) is described more extensively in a paper by Elena-Carr et al (2006.). VGPM is a Depth Integrated Model(DIM) described by Behrenfeld and Falkowski (1997), with modification due to Eppley (1972) as implemented by Antoine and Morel (1996). There are multiple retrieval algorithms for estimating Chl-a. These data (eppley_npp_chl_oc3) use the OC3 method implemented by the NASA Ocean Biology Processing Group in the SeaDAS processing software l2gen. The OC3 algorithm is described at https://oceancolor.gsfc.nasa.gov/atbd/chlor_a/ (and links therein). The Eppley_NPP_chl_oc3 product (based on the IMOS chl_oc3 product) is experimental and was created for comparison purposes with Eppley_NPP_chl_gsm, which is the recommended NPP product. It should only be used with full understanding of the algorithms. If you do not know which product to use, then go with Eppley_NPP_chl_gsm. Production of contemporary MODIS data ceased at 2024/12/26. Users requiring similar Ocean Colour Radiometry data beyond 2024 should consider the VIIRS instruments on the SNPP and NOAA20+ series of satellites, also provided by IMOS.

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Additional Info

Field Value
Title IMOS - Satellite Remote Sensing - MODIS - 01 day - Net Primary Productivity (OC3 model and Eppley-VGPM algorithm)
Language eng
Licence Not Specified
Landing Page https://data.gov.au/data/dataset/969500a2-0e04-465a-9aa5-7efafb3d46a1
Contact Point
Australian Ocean Data Network
Edward.King@csiro.au
Reference Period 01/07/2002 - 26/12/2024
Geospatial Coverage
Map data © OpenStreetMap contributors
{
  "coordinates": [
    [
      [
        80.0,
        -60.0
      ],
      [
        179.9,
        -60.0
      ],
      [
        179.9,
        10.0
      ],
      [
        80.0,
        10.0
      ],
      [
        80.0,
        -60.0
      ]
    ]
  ],
  "type": "Polygon"
}
Data Portal Australian Oceans Data Network

Data Source

This dataset was originally found on Australian Oceans Data Network "IMOS - Satellite Remote Sensing - MODIS - 01 day - Net Primary Productivity (OC3 model and Eppley-VGPM algorithm)". Please visit the source to access the original metadata of the dataset:
https://catalogue.aodn.org.au/geonetwork/srv/eng/csw/dataset/imos-satellite-remote-sensing-modis-01-day-net-primary-productivity-oc3-model-and-eppley-vgpm-a