Unexpected quasi-independence of coloured dissolved organic matter absorption from chlorophyll-<i>a</i> concentration in the Southern Ocean

Li, Juan; Antoine, David; Huot, Yannick

doi:10.5194/bg-23-3073-2026

Articles | Volume 23, issue 9

https://doi.org/10.5194/bg-23-3073-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/bg-23-3073-2026

© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 9

Research article

|

08 May 2026

Research article |

| 08 May 2026

Unexpected quasi-independence of coloured dissolved organic matter absorption from chlorophyll-a concentration in the Southern Ocean

Juan Li, David Antoine, and Yannick Huot

Supplement

https://doi.org/10.5194/bg-23-3073-2026-supplement

Data sets

Particulate light absorption coefficients (350-750 nm) measured using the filter pad method during the Antarctic Circumnavigation Expedition (ACE) during the austral summer of 2016/2017 D. Antoine et al. https://doi.org/10.5281/zenodo.3993096

Phytoplankton pigment concentrations of seawater sampled during the Antarctic Circumnavigation Expedition (ACE) during the Austral Summer of 2016/2017 D. Antoine et al. https://doi.org/10.5281/zenodo.3816726

Physical and biogeochemical oceanography data from underway measurements with an AquaLine Ferrybox during the Antarctic Circumnavigation Expedition (ACE) F. A. Haumann et al. https://doi.org/10.5281/zenodo.3660852

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Short summary

Evidence is growing that bio-optical relationships in the Southern Ocean differ from what they are elsewhere. Uncertainties about these properties are far from been resolved. However, our study adds a new piece to this puzzle by examining the bio-optical properties of the absorption coefficient of colored dissolved organic matter, which is the least documented property in oceanic waters. As for the methodology, this is the first time that Biogeochemical-Argo float data are used to quantify it.