High latitude Southern Ocean phytoplankton have distinctive bio-optical properties
Studying the biogeochemistry of the Southern Ocean using remote sensing relies on accurate interpretation of ocean colour through bio-optical and biogeochemical relationships between quantities and properties of interest. During the Antarctic Circumnavigation Expedition of the 2016/2017 Austral Summ...
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ftdatacite:10.6084/m9.figshare.c.5361953 2023-05-15T14:01:42+02:00 High latitude Southern Ocean phytoplankton have distinctive bio-optical properties Robinson, Charlotte Huot, Yannick Schuback, Nina Ryan-Keogh, Thomas thomalla, sandy Antoine, David 2021 https://dx.doi.org/10.6084/m9.figshare.c.5361953 https://osapublishing.figshare.com/collections/High_latitude_Southern_Ocean_phytoplankton_have_distinctive_bio-optical_properties/5361953 unknown The Optical Society https://dx.doi.org/10.1364/oe.426737 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY 40599 Oceanography not elsewhere classified FOS Earth and related environmental sciences 40501 Biological Oceanography 90905 Photogrammetry and Remote Sensing FOS Environmental engineering Collection article 2021 ftdatacite https://doi.org/10.6084/m9.figshare.c.5361953 https://doi.org/10.1364/oe.426737 2021-11-05T12:55:41Z Studying the biogeochemistry of the Southern Ocean using remote sensing relies on accurate interpretation of ocean colour through bio-optical and biogeochemical relationships between quantities and properties of interest. During the Antarctic Circumnavigation Expedition of the 2016/2017 Austral Summer, we collected a spatially comprehensive dataset of phytoplankton pigment concentrations, particulate absorption and particle size distribution, and compared simple bio-optical and particle property relationships as a function of chlorophyll \textit{a}. Similar to previous studies we find that the chlorophyll-specific phytoplankton absorption coefficient is significantly lower than in other oceans at comparable chlorophyll concentrations. This appears to be driven in part by lower concentrations of accessory pigments per unit chlorophyll \textit{a} as well as increased pigment packaging due to relatively larger sized phytoplankton at low chlorophyll \textit{a} than is typically observed in other oceans. We find that the contribution of microphytoplankton (>20 $\mu$m size) to chlorophyll \textit{a} estimates of phytoplankton biomass is significantly higher than expected for the given chlorophyll \textit{a} concentration, especially in higher latitudes south of the Southern Antarctic Circumpolar Current Front. Phytoplankton pigments are more packaged in larger cells, which resulted in a flattening of phytoplankton spectra as measured in these samples when compared to other ocean regions with similar chlorophyll \textit{a} concentration. Additionally, we find that at high latitude locations in the Southern Ocean, pheopigment concentrations can exceed mono-vinyl chlorophyll \textit{a} concentrations. Finally, we observed very different relationships between particle volume and chlorophyll \textit{a} concentrations in high and low latitude Southern Ocean waters, driven by differences in phytoplankton community composition and acclimation to environmental conditions, and varying contribution of non-algal particles to the particulate matter. Our data confirm that, as previously suggested, the relationships between bio-optical properties and chlorophyll \textit{a} in the Southern Ocean are different to other oceans. In addition, distinct bio-optical properties were evident between high and low latitude regions of the Southern Ocean basin. Here we provide a region-specific set of power law functions describing the phytoplankton absorption spectrum as a function of chlorophyll \textit{a}. Article in Journal/Newspaper Antarc* Antarctic Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Austral |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
40599 Oceanography not elsewhere classified FOS Earth and related environmental sciences 40501 Biological Oceanography 90905 Photogrammetry and Remote Sensing FOS Environmental engineering |
spellingShingle |
40599 Oceanography not elsewhere classified FOS Earth and related environmental sciences 40501 Biological Oceanography 90905 Photogrammetry and Remote Sensing FOS Environmental engineering Robinson, Charlotte Huot, Yannick Schuback, Nina Ryan-Keogh, Thomas thomalla, sandy Antoine, David High latitude Southern Ocean phytoplankton have distinctive bio-optical properties |
topic_facet |
40599 Oceanography not elsewhere classified FOS Earth and related environmental sciences 40501 Biological Oceanography 90905 Photogrammetry and Remote Sensing FOS Environmental engineering |
description |
Studying the biogeochemistry of the Southern Ocean using remote sensing relies on accurate interpretation of ocean colour through bio-optical and biogeochemical relationships between quantities and properties of interest. During the Antarctic Circumnavigation Expedition of the 2016/2017 Austral Summer, we collected a spatially comprehensive dataset of phytoplankton pigment concentrations, particulate absorption and particle size distribution, and compared simple bio-optical and particle property relationships as a function of chlorophyll \textit{a}. Similar to previous studies we find that the chlorophyll-specific phytoplankton absorption coefficient is significantly lower than in other oceans at comparable chlorophyll concentrations. This appears to be driven in part by lower concentrations of accessory pigments per unit chlorophyll \textit{a} as well as increased pigment packaging due to relatively larger sized phytoplankton at low chlorophyll \textit{a} than is typically observed in other oceans. We find that the contribution of microphytoplankton (>20 $\mu$m size) to chlorophyll \textit{a} estimates of phytoplankton biomass is significantly higher than expected for the given chlorophyll \textit{a} concentration, especially in higher latitudes south of the Southern Antarctic Circumpolar Current Front. Phytoplankton pigments are more packaged in larger cells, which resulted in a flattening of phytoplankton spectra as measured in these samples when compared to other ocean regions with similar chlorophyll \textit{a} concentration. Additionally, we find that at high latitude locations in the Southern Ocean, pheopigment concentrations can exceed mono-vinyl chlorophyll \textit{a} concentrations. Finally, we observed very different relationships between particle volume and chlorophyll \textit{a} concentrations in high and low latitude Southern Ocean waters, driven by differences in phytoplankton community composition and acclimation to environmental conditions, and varying contribution of non-algal particles to the particulate matter. Our data confirm that, as previously suggested, the relationships between bio-optical properties and chlorophyll \textit{a} in the Southern Ocean are different to other oceans. In addition, distinct bio-optical properties were evident between high and low latitude regions of the Southern Ocean basin. Here we provide a region-specific set of power law functions describing the phytoplankton absorption spectrum as a function of chlorophyll \textit{a}. |
format |
Article in Journal/Newspaper |
author |
Robinson, Charlotte Huot, Yannick Schuback, Nina Ryan-Keogh, Thomas thomalla, sandy Antoine, David |
author_facet |
Robinson, Charlotte Huot, Yannick Schuback, Nina Ryan-Keogh, Thomas thomalla, sandy Antoine, David |
author_sort |
Robinson, Charlotte |
title |
High latitude Southern Ocean phytoplankton have distinctive bio-optical properties |
title_short |
High latitude Southern Ocean phytoplankton have distinctive bio-optical properties |
title_full |
High latitude Southern Ocean phytoplankton have distinctive bio-optical properties |
title_fullStr |
High latitude Southern Ocean phytoplankton have distinctive bio-optical properties |
title_full_unstemmed |
High latitude Southern Ocean phytoplankton have distinctive bio-optical properties |
title_sort |
high latitude southern ocean phytoplankton have distinctive bio-optical properties |
publisher |
The Optical Society |
publishDate |
2021 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5361953 https://osapublishing.figshare.com/collections/High_latitude_Southern_Ocean_phytoplankton_have_distinctive_bio-optical_properties/5361953 |
geographic |
Antarctic Southern Ocean The Antarctic Austral |
geographic_facet |
Antarctic Southern Ocean The Antarctic Austral |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_relation |
https://dx.doi.org/10.1364/oe.426737 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5361953 https://doi.org/10.1364/oe.426737 |
_version_ |
1766271727748251648 |