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    Diel variability of the beam attenuation and backscattering coefficients in the northwestern Mediterranean Sea (BOUSSOLE site)

    204949_138128_jgrc20826.pdf (1.672Mb)
    Access Status
    Open access
    Authors
    Kheireddine, M.
    Antoine, David
    Date
    2014
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kheireddine, M. and Antoine, D. 2014. Diel variability of the beam attenuation and backscattering coefficients in the northwestern Mediterranean Sea (BOUSSOLE site). Journal of Geophysical Research: Oceans. 119 (8): pp. 5465-5482.
    Source Title
    Journal of Geophysical Research: Oceans
    DOI
    10.1002/2014JC010007
    ISSN
    2169-9275
    School
    Department of Imaging and Applied Physics
    Remarks

    © 2014. American Geophysical Union

    URI
    http://hdl.handle.net/20.500.11937/29258
    Collection
    • Curtin Research Publications
    Abstract

    The diel variability of the particulate beam attenuation coefficient, cp, and of the particulate backscattering coefficient, bbp, were investigated during five seasonal cycles at an oceanic site in the northwestern Mediterranean Sea, covering contrasting physical and trophic situations. We observed a diel cycle in cp and bbp, related to changes in phytoplankton properties (i.e., size and refractive index) induced by the accumulation of carbon within phytoplankton cells associated with photosynthetic processes, during the winter mixing of the water column, the development of the spring phytoplankton bloom, its decline, and during the summer oligotrophy. The relative amplitude of the cp diel variability was much larger during the spring bloom (20–50%) than during other seasons (10–20%), whereas that of bbp is steadily around 20% and does not show significant seasonal variability. The minimal cp and bbp occurred at sunrise and are synchronized, whereas maximum bbp values are often reached 3–6 h before those for cp (except during bloom conditions), which occur near sunset. These different amplitudes and timing are tentatively explained using Mie computations, which allow discerning the respective roles of changes in the particle size distribution and refractive index. The differences observed here in the diel cycles of cp and bbp show that they cannot be used interchangeably to determine the daily increase of the particle pool. This result has implications on the feasibility to determine net community production from the bbp diel changes, when only bbp is measured in situ or available from ocean color observations.

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