POSTER Session 3

A NEW POC ALGORITHM FOR OPEN AND COASTAL WATERS IN THE FRAME OF THE OCROC PROJECT (COPERNICUS MARINE SERVICE): APPLICATION TO OLCI OBSERVATIONS

Carbon monitoring from space is critical for the reporting and verification of carbon stocks and changes in both coastal and open ocean waters. In the frame of the OCROC project (Copernicus 2 – 1st Service Evolution Call for Tenders), we focus on the particulate (POC) and dissolved (DOC) organic carbon of surface oceanic and coastal waters, which represent the two components of the total organic carbon (TOC) in the ocean. Due to their different role in the carbon cycle, as well as their different carbon export pathways toward the deep ocean, the spatio-temporal distribution of POC and DOC and their relative contributions to TOC have to be characterized over the global ocean. In this presentation we will only focus on POC. While surface POC spatio-temporal patterns are now relatively well described over open ocean waters, thanks to the availability of different algorithms, POC over coastal waters are still not well described. To better account for the bio-optical complexity of marine (coastal and oceanic) waters, and to better address the transition between coastal and open ocean waters three different algorithms have been combined using an Optical Water Class (OWC) approach to estimate POC. Uncertainty for each group of OWC has been estimated based on a large match-up data set. Description of the algorithms, results of the validation, and application to OLCI data will be shown. POC products are made available through a specific section (intitled oceanic carbon demonstration products) at https://boc.acri.fr/ for evaluation and feedbacks by the community.

Hubert Loisel, Laboratoire d’Océanologie et de Géosciences (LOG), France, [email protected]

Daniel S.F. Jorge, Laboratoire d’Océanologie et de Géosciences (LOG), France, [email protected]

Marine Bretagnon, ACRI-ST, France, [email protected]

Julien Demaria, ACRI-ST, France, [email protected]

Aurélien Prat, ACRI-ST, France, [email protected]

Lucile Duforêt-Gaurier, Laboratoire d’Océanologie et de Géosciences (LOG), France, [email protected]

Vincent Vantrepotte, Laboratoire d’Océanologie et de Géosciences (LOG), France, [email protected]

Man Tran Duy, Laboratoire d’Océanologie et de Géosciences (LOG), France, [email protected]

Ikram Salah Salah, Laboratoire d’Océanologie et de Géosciences (LOG), France, [email protected]

Antoine Mangin, ACRI-ST, France, [email protected]

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