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dc.contributor.authorRobinson, Charlotte
dc.contributor.authorHuot, Yannick
dc.contributor.authorSchuback, Nina
dc.contributor.authorRyan-Keogh, Thomas J
dc.contributor.authorThomalla, Sandy J
dc.contributor.authorAntoine, David
dc.date.accessioned2023-01-10T02:11:03Z
dc.date.available2023-01-10T02:11:03Z
dc.date.issued2021
dc.identifier.citationRobinson, C. and Huot, Y. and Schuback, N. and Ryan-Keogh, T.J. and Thomalla, S.J. and Antoine, D. 2021. High latitude Southern Ocean phytoplankton have distinctive bio-optical properties. Optics Express. 29 (14): pp. 21084-21112.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/89993
dc.identifier.doi10.1364/OE.426737
dc.description.abstract

Abstract: 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 2016/2017Austral 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 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 a as well as increased pigment packaging due to relatively larger sized phytoplankton at low chlorophyll a than is typically observed in other oceans. We find that the contribution of microphytoplankton (>20 μm size) to chlorophyll a estimates of phytoplankton biomass is significantly higher than expected for the given chlorophyll 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 a concentration. Additionally, we find that at high latitude locations in the Southern Ocean, pheopigment concentrations can exceed mono-vinyl chlorophyll a concentrations. Finally, we observed very different relationships between particle volume and chlorophyll 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 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 a.

dc.languageEnglish
dc.publisherOptical Society of America (OSA)
dc.relation.sponsoredbyhttp://purl.org/au-research/grants/arc/DP160103387
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectScience & Technology
dc.subjectPhysical Sciences
dc.subjectOptics
dc.subjectNATURAL IRON-FERTILIZATION
dc.subjectSPECTRAL ABSORPTION-COEFFICIENTS
dc.subjectNONLINEAR MINIMIZATION SUBJECT
dc.subjectCHLOROPHYLL-A CONCENTRATION
dc.subjectLIGHT-ABSORPTION
dc.subjectIN-SITU
dc.subjectOPTICAL-PROPERTIES
dc.subjectANTARCTIC PHYTOPLANKTON
dc.subjectPHAEOCYSTIS-ANTARCTICA
dc.subjectKERGUELEN PLATEAU
dc.titleHigh latitude Southern Ocean phytoplankton have distinctive bio-optical properties
dc.typeJournal Article
dcterms.source.volume29
dcterms.source.number14
dcterms.source.startPage21084
dcterms.source.endPage21112
dcterms.source.issn1094-4087
dcterms.source.titleOptics Express
dc.date.updated2023-01-10T02:11:03Z
curtin.note

© 2021 Optical Society of America

curtin.departmentSchool of Earth and Planetary Sciences (EPS)
curtin.accessStatusOpen access
curtin.facultyFaculty of Science and Engineering
curtin.contributor.orcidAntoine, David [0000-0002-9082-2395]
curtin.contributor.orcidRobinson, Charlotte [0000-0001-8519-5641]
curtin.contributor.researcheridRobinson, Charlotte [O-2953-2017]
dcterms.source.eissn1094-4087
curtin.contributor.scopusauthoridAntoine, David [7003439584]
curtin.contributor.scopusauthoridRobinson, Charlotte [57189331987]


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