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Ocean Colour CCI chlorophyll product compared to MyOcean and GlobColour

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The OC-CCI-v2.0 chlorophyll product (units of mg/m^3) is derived from merged MODIS-Aqua, SeaWiFS and MERIS data; generated in 2015 with the current input dataset versions. The SeaWiFS and MODIS data was processed from Level 1 to 2 within the project, with the NASA standard processing (SeaDAS 7.0), and POLYMER was used for the MERIS atmospheric correction. Then the MODIS and MERIS data were band shifted to the six main SeaWiFS bands and a bias correction applied before merging, after which the OC4v6 chlorophyll algorithm was applied; within Phase 2 of the project a research focus includes improving the products within Case-2 waters. See OC-CCI Product User Guide http://www.esa-oceancolour-cci.org/index.php?q=webfm_send/419

The MyOcean REP (reprocessed) products use the OC-CCI-v1.0 4km bias-corrected/merged remote-sensing reflectance (Rrs, surface ratio of upwelling radiance emerging from seawater to downwelling radiative flux in air), which is resampled to 1km for the regional datasets and then has the OC4 or OC5 chlorophyll algorithms applied alongside Rrs being made available. See MyOcean Product User Manual http://catalogue.myocean.eu.org/static/resources/myocean/pum/MYO2-OC-PUM...

The GlobColour RAN (reanalysis) products are produced by ACRI-ST using the GlobColour processor that merges MODIS-Aqua, SeaWiFS and MERIS; the dataset was originally generated in 2008 and has since been reprocessed (2nd reprocessing). There are several chlorophyll products available:

  • CHL1 merged products that include:
    • GSM derived product based on merged Level 2 data, following the approach proposed by Maritorena and Siegel (2005, RSE);
    • OC4Me algorithm (an inter-calibration is applied to the MODIS-Aqua and SeaWiFS Level 2 chlorophyll products to get MERIS algorithm compatible inputs) with a weighted averaging merging (AVW) method then applied to merge the adjusted MODIS and SeaWiFS products with MERIS data – there is also a simple average (AV) single sensor OC4Me product;
  • CHL2 that’s the MERIS C2R Neural Network algorithm (only available for input MERIS data).

See GlobColour Product User Guide http://www.globcolour.info/CDR_Docs/GlobCOLOUR_PUG.pdf