HYGEOS support forum

Dear Steinmetz,
Thank you for share the Polymer.

I would like to know what is the chl-a algorithm applied in Polymer?
Is the OC4me from Morel and Antoine (2007)? Some difference with Morel and Antoine (2011)?
Also I would like to know if you have some validation for the Polymer's chl-a product.

Thank you very much, Joao.

Hi Joao,

In Polymer, chl-a is not derived from the water reflectance as with bio-optical algorithms like OC4Me : it is derived as part of the optimization scheme. It is the final value of the parameter [chl] to the water reflectance model, described in https://doi.org/10.1364/OE.19.009783 (although the water reflectance model has been updated since then, as described in https://doi.org/10.1117/12.2500232). Applying a bio-optical algorithm to the water reflectance provided by Polymer may lead to different results.

Here you can find some validation results of Polymer's chl :
https://doi.org/10.1364/OE.26.00A678
https://doi.org/10.5194/os-11-139-2015

Thank you very much.
Regards.