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    Proxies of community production derived from the diel variability of particulate attenuation and backscattering coefficients in the northwest Mediterranean Sea

    204850_137576_Barnes-Antoine-L_O2014-2133.pdf (1.587Mb)
    Access Status
    Open access
    Authors
    Barnes, M.
    Antoine, David
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Barnes, M. and Antoine, D. 2014. Proxies of community production derived from the diel variability of particulate attenuation and backscattering coefficients in the northwest Mediterranean Sea. Limnology and Oceanography. 59 (6): pp. 2133-2149.
    Source Title
    Limnology and Oceanography
    DOI
    10.4319/lo.2014.59.6.2133
    ISSN
    0024-3590
    School
    Department of Imaging and Applied Physics
    URI
    http://hdl.handle.net/20.500.11937/6199
    Collection
    • Curtin Research Publications
    Abstract

    A 6 yr time series of high frequency inherent optical property (IOP) measurements in the Mediterranean was used to derive information on the diel and seasonal variability of particulate production. Empirical relationships between particulate attenuation (cp), particulate backscattering (bbp), and particulate organic carbon allowed calculation of estimates of net community production (NCP), daytime NCP (NCPd), and gross community production (GCP) from the diel variations in either IOP. Similar seasonal variations and good correlation (r = 0.83, p < 0.001) between daily means of cp and bbp were observed, yet differences in the timing and amplitude of their diel cycles led to significant differences in their derived production metrics. Best agreement was obtained during bloom proliferation (44.1–66.7% shared variance) when all three production estimates were highest, while worst was during bloom decline. Best overall correlation was found for NCPd. Accordingly, only cp-derived estimates reproduced predicted seasonal variations in community production and seasonality of ‘‘traditional’’ chlorophyll-based primary production models. Analysis of the diel cycles of ‘‘real-time’’ net community production (NCPh), determined from the first-derivative of either cp or bbp, revealed ca. fourfold to eightfold lower daytime NCPh, twofold to fivefold lower daily maximum NCPh, and twice as much intraseasonal variability relative to the mean amplitude of diel variations for bbp. Although the timing of maximum of cp-derived NCPh was consistently prior to solar noon, significant seasonal differences in the timing of maximum bbp-derived NCPh was observed. Particulate backscattering may be used to infer biogeochemical properties, while greater understanding of the diel cycles of bbp is needed before bbp can be used to investigate daily community production

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