Bio-optical properties of two neigboring coastal regions of tropical Northern Australia

The Van Diemen Gulf and Darwin Harbour

David Blondeau-Patissier, Thomas Schroeder, Lesley A. Clementson, Vittorio E. Brando, Diane Purcell, Phillip Ford, David K. Williams, David Doxaran, Janet Anstee, Nandika Thapar, Miguel Tovar-Valencia

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    This study focuses on the seasonal and spatial characterization of inherent optical properties and biogeochemical concentrations in the Van Diemen Gulf and Darwin Harbour, two neighboring tropical coastal environments of Northern Australia that exhibit shallow depths (~20 m), large (>3 m) semi-diurnal tides, and a monsoonal climate. To gain insight in the functioning of these optically complex coastal ecosystems, a total of 23 physical, biogeochemical, and optical parameters were sampled at 63 stations during three field campaigns covering the 2012 wet and dry seasons, and the 2013 dry season. The total light absorption budget in the Van Diemen Gulf was dominated by non-algal particles (aNAP; >45%) during the dry season (May-October) and colored dissolved organic matter (aCDOM; 60%) during the wet season (November-April). The combined absorption by aNAP and aCDOM generally exceeded ~80% of the total absorption budget from 400 to 620 nm, with phytoplankton, aPhy, accounting for <20%. In Darwin Harbour, where only the dry season conditions were sampled, the total absorption budget was dominated by an equivalent contribution of aCDOM, aNAP, and phytoplankton. The major processes explaining the seasonal variability observed in the Van Diemen Gulf are resuspension from seasonal south-easterly trade winds in combination with the tidal energy and shallow bathymetry during the dry season months, and mostly terrestrial river runoff during the monsoon which discharge terrestrial CDOM from the surrounding wetlands. Due to light-limited conditions all year round, the particulate scattering coefficient [bp(555)] contributed significantly (90%) to the beam attenuation coefficient c(555), thus strongly limiting phytoplankton growth (Chlorophyll a ~1 mg.m-3). Spatially, the Van Diemen Gulf had higher total suspended solids and nutrient concentrations than Darwin Harbour, with dissolved organic carbon and aCDOM subjected to photobleaching during the dry season. Key bio-optical relationships derived from this comprehensive set of parameters, the first ever to be collected in this tropical coastal environment, were successfully used for a region-specific seasonal parameterization a region-specific seasonally parameterized ocean color algorithm. Challenges related to the parameterization, and the use, of ocean color remote sensing algorithms for these optically complex waters are discussed.

    Original languageEnglish
    Article number114
    Pages (from-to)1-27
    Number of pages27
    JournalFrontiers in Marine Science
    Volume4
    DOIs
    Publication statusPublished - 15 May 2017

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    harbors (waterways)
    Phytoplankton
    optical properties
    Ports and harbors
    optical property
    dry season
    tropics
    harbor
    Optical properties
    Parameterization
    Color
    Photobleaching
    Bathymetry
    tropical environment
    ocean color
    phytoplankton
    Tides
    Chlorophyll
    Wetlands
    Organic carbon

    Cite this

    Blondeau-Patissier, D., Schroeder, T., Clementson, L. A., Brando, V. E., Purcell, D., Ford, P., ... Tovar-Valencia, M. (2017). Bio-optical properties of two neigboring coastal regions of tropical Northern Australia: The Van Diemen Gulf and Darwin Harbour. Frontiers in Marine Science, 4, 1-27. [114]. https://doi.org/10.3389/fmars.2017.00114
    Blondeau-Patissier, David ; Schroeder, Thomas ; Clementson, Lesley A. ; Brando, Vittorio E. ; Purcell, Diane ; Ford, Phillip ; Williams, David K. ; Doxaran, David ; Anstee, Janet ; Thapar, Nandika ; Tovar-Valencia, Miguel. / Bio-optical properties of two neigboring coastal regions of tropical Northern Australia : The Van Diemen Gulf and Darwin Harbour. In: Frontiers in Marine Science. 2017 ; Vol. 4. pp. 1-27.
    @article{829d338533d245cfbf70ca5182fe27b7,
    title = "Bio-optical properties of two neigboring coastal regions of tropical Northern Australia: The Van Diemen Gulf and Darwin Harbour",
    abstract = "This study focuses on the seasonal and spatial characterization of inherent optical properties and biogeochemical concentrations in the Van Diemen Gulf and Darwin Harbour, two neighboring tropical coastal environments of Northern Australia that exhibit shallow depths (~20 m), large (>3 m) semi-diurnal tides, and a monsoonal climate. To gain insight in the functioning of these optically complex coastal ecosystems, a total of 23 physical, biogeochemical, and optical parameters were sampled at 63 stations during three field campaigns covering the 2012 wet and dry seasons, and the 2013 dry season. The total light absorption budget in the Van Diemen Gulf was dominated by non-algal particles (aNAP; >45{\%}) during the dry season (May-October) and colored dissolved organic matter (aCDOM; 60{\%}) during the wet season (November-April). The combined absorption by aNAP and aCDOM generally exceeded ~80{\%} of the total absorption budget from 400 to 620 nm, with phytoplankton, aPhy, accounting for <20{\%}. In Darwin Harbour, where only the dry season conditions were sampled, the total absorption budget was dominated by an equivalent contribution of aCDOM, aNAP, and phytoplankton. The major processes explaining the seasonal variability observed in the Van Diemen Gulf are resuspension from seasonal south-easterly trade winds in combination with the tidal energy and shallow bathymetry during the dry season months, and mostly terrestrial river runoff during the monsoon which discharge terrestrial CDOM from the surrounding wetlands. Due to light-limited conditions all year round, the particulate scattering coefficient [bp(555)] contributed significantly (90{\%}) to the beam attenuation coefficient c(555), thus strongly limiting phytoplankton growth (Chlorophyll a ~1 mg.m-3). Spatially, the Van Diemen Gulf had higher total suspended solids and nutrient concentrations than Darwin Harbour, with dissolved organic carbon and aCDOM subjected to photobleaching during the dry season. Key bio-optical relationships derived from this comprehensive set of parameters, the first ever to be collected in this tropical coastal environment, were successfully used for a region-specific seasonal parameterization a region-specific seasonally parameterized ocean color algorithm. Challenges related to the parameterization, and the use, of ocean color remote sensing algorithms for these optically complex waters are discussed.",
    keywords = "Coastal waters, Northern Australia, Optical properties, Seasonal variability, Tropical waters, Water quality",
    author = "David Blondeau-Patissier and Thomas Schroeder and Clementson, {Lesley A.} and Brando, {Vittorio E.} and Diane Purcell and Phillip Ford and Williams, {David K.} and David Doxaran and Janet Anstee and Nandika Thapar and Miguel Tovar-Valencia",
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    Blondeau-Patissier, D, Schroeder, T, Clementson, LA, Brando, VE, Purcell, D, Ford, P, Williams, DK, Doxaran, D, Anstee, J, Thapar, N & Tovar-Valencia, M 2017, 'Bio-optical properties of two neigboring coastal regions of tropical Northern Australia: The Van Diemen Gulf and Darwin Harbour', Frontiers in Marine Science, vol. 4, 114, pp. 1-27. https://doi.org/10.3389/fmars.2017.00114

    Bio-optical properties of two neigboring coastal regions of tropical Northern Australia : The Van Diemen Gulf and Darwin Harbour. / Blondeau-Patissier, David; Schroeder, Thomas; Clementson, Lesley A.; Brando, Vittorio E.; Purcell, Diane; Ford, Phillip; Williams, David K.; Doxaran, David ; Anstee, Janet; Thapar, Nandika; Tovar-Valencia, Miguel.

    In: Frontiers in Marine Science, Vol. 4, 114, 15.05.2017, p. 1-27.

    Research output: Contribution to journalArticleResearchpeer-review

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    T1 - Bio-optical properties of two neigboring coastal regions of tropical Northern Australia

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    AU - Blondeau-Patissier, David

    AU - Schroeder, Thomas

    AU - Clementson, Lesley A.

    AU - Brando, Vittorio E.

    AU - Purcell, Diane

    AU - Ford, Phillip

    AU - Williams, David K.

    AU - Doxaran, David

    AU - Anstee, Janet

    AU - Thapar, Nandika

    AU - Tovar-Valencia, Miguel

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    N2 - This study focuses on the seasonal and spatial characterization of inherent optical properties and biogeochemical concentrations in the Van Diemen Gulf and Darwin Harbour, two neighboring tropical coastal environments of Northern Australia that exhibit shallow depths (~20 m), large (>3 m) semi-diurnal tides, and a monsoonal climate. To gain insight in the functioning of these optically complex coastal ecosystems, a total of 23 physical, biogeochemical, and optical parameters were sampled at 63 stations during three field campaigns covering the 2012 wet and dry seasons, and the 2013 dry season. The total light absorption budget in the Van Diemen Gulf was dominated by non-algal particles (aNAP; >45%) during the dry season (May-October) and colored dissolved organic matter (aCDOM; 60%) during the wet season (November-April). The combined absorption by aNAP and aCDOM generally exceeded ~80% of the total absorption budget from 400 to 620 nm, with phytoplankton, aPhy, accounting for <20%. In Darwin Harbour, where only the dry season conditions were sampled, the total absorption budget was dominated by an equivalent contribution of aCDOM, aNAP, and phytoplankton. The major processes explaining the seasonal variability observed in the Van Diemen Gulf are resuspension from seasonal south-easterly trade winds in combination with the tidal energy and shallow bathymetry during the dry season months, and mostly terrestrial river runoff during the monsoon which discharge terrestrial CDOM from the surrounding wetlands. Due to light-limited conditions all year round, the particulate scattering coefficient [bp(555)] contributed significantly (90%) to the beam attenuation coefficient c(555), thus strongly limiting phytoplankton growth (Chlorophyll a ~1 mg.m-3). Spatially, the Van Diemen Gulf had higher total suspended solids and nutrient concentrations than Darwin Harbour, with dissolved organic carbon and aCDOM subjected to photobleaching during the dry season. Key bio-optical relationships derived from this comprehensive set of parameters, the first ever to be collected in this tropical coastal environment, were successfully used for a region-specific seasonal parameterization a region-specific seasonally parameterized ocean color algorithm. Challenges related to the parameterization, and the use, of ocean color remote sensing algorithms for these optically complex waters are discussed.

    AB - This study focuses on the seasonal and spatial characterization of inherent optical properties and biogeochemical concentrations in the Van Diemen Gulf and Darwin Harbour, two neighboring tropical coastal environments of Northern Australia that exhibit shallow depths (~20 m), large (>3 m) semi-diurnal tides, and a monsoonal climate. To gain insight in the functioning of these optically complex coastal ecosystems, a total of 23 physical, biogeochemical, and optical parameters were sampled at 63 stations during three field campaigns covering the 2012 wet and dry seasons, and the 2013 dry season. The total light absorption budget in the Van Diemen Gulf was dominated by non-algal particles (aNAP; >45%) during the dry season (May-October) and colored dissolved organic matter (aCDOM; 60%) during the wet season (November-April). The combined absorption by aNAP and aCDOM generally exceeded ~80% of the total absorption budget from 400 to 620 nm, with phytoplankton, aPhy, accounting for <20%. In Darwin Harbour, where only the dry season conditions were sampled, the total absorption budget was dominated by an equivalent contribution of aCDOM, aNAP, and phytoplankton. The major processes explaining the seasonal variability observed in the Van Diemen Gulf are resuspension from seasonal south-easterly trade winds in combination with the tidal energy and shallow bathymetry during the dry season months, and mostly terrestrial river runoff during the monsoon which discharge terrestrial CDOM from the surrounding wetlands. Due to light-limited conditions all year round, the particulate scattering coefficient [bp(555)] contributed significantly (90%) to the beam attenuation coefficient c(555), thus strongly limiting phytoplankton growth (Chlorophyll a ~1 mg.m-3). Spatially, the Van Diemen Gulf had higher total suspended solids and nutrient concentrations than Darwin Harbour, with dissolved organic carbon and aCDOM subjected to photobleaching during the dry season. Key bio-optical relationships derived from this comprehensive set of parameters, the first ever to be collected in this tropical coastal environment, were successfully used for a region-specific seasonal parameterization a region-specific seasonally parameterized ocean color algorithm. Challenges related to the parameterization, and the use, of ocean color remote sensing algorithms for these optically complex waters are discussed.

    KW - Coastal waters

    KW - Northern Australia

    KW - Optical properties

    KW - Seasonal variability

    KW - Tropical waters

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