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    Inferring and removing a spurious response in the optical backscattering signal from an autonomous profiling float

    Access Status
    Fulltext not available
    Authors
    Wojtasiewicza, B.
    Walsh, I.
    Antoine, David
    Slawinski, D.
    Hardman-Mountford, N.
    Date
    2018
    Type
    Journal Article
    
    Metadata
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    Citation
    Wojtasiewicza, B. and Walsh, I. and Antoine, D. and Slawinski, D. and Hardman-Mountford, N. 2018. Inferring and removing a spurious response in the optical backscattering signal from an autonomous profiling float. Journal of Atmospheric and Oceanic Technology. 35 (11): pp. 2137-2146.
    Source Title
    Journal of Atmospheric and Oceanic Technology
    DOI
    10.1175/JTECH-D-18-0027.1
    ISSN
    0739-0572
    URI
    http://hdl.handle.net/20.500.11937/74521
    Collection
    • Curtin Research Publications
    Abstract

    Development of autonomous profiling floats, allowing for long-term continuous measurement of bio-optical variables, promises to significantly increase our knowledge of the variability of the particulate optical backscattering coefficient bbp in marine environments. However, because autonomous floats are designed for unattended data collection and only rarely are recovered for analysis of the condition of the sensors in situ, the quality-control analysis of float data streams is of paramount importance in both a particular dataset and the larger understanding of the response of sensors over the lifetime of the floats. Anomalous data from a backscattering sensor (MCOMS) mounted on autonomous profiling floats are reported here. The observed sensor behavior, which presents itself as significant differences in the values observed at the parking depth between profiles, caused by a steady increase in the signal during the profiling time, is neither common to all sensors nor can it be a function of changes in the particle population. A simple quality-control procedure that is able to detect this spurious sensor response is proposed. Further characterization of this effect will require laboratory experimentation under controlled conditions of temperature and pressure.

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