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    Processing Bio-Argo nitrate concentration at the DAC Level. Version 1.1, March 3rd 2018.

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    Date
    2018
    Author
    Johnson, Ken
    Pasqueron De Fommervaul, Orens
    Serra, Romain
    D'Ortenzio, Fabrizio
    Schmechtig, Catherine
    Claustre, Herve
    Poteau, Antoine
    Status
    Published
    Pages
    22pp.
    
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    Abstract
    The only method used to date to measure dissolved nitrate concentration (NITRATE) with sensors mounted on profiling floats is based on the absorption of light at ultraviolet wavelengths by nitrate ion (Johnson and Coletti, 2002; Johnson et al., 2010; 2013; D’Ortenzio et al., 2012). Nitrate has a modest UV absorption band with a peak near 210 nm, which overlaps with the stronger absorption band of bromide, which has a peak near 200 nm. In addition, there is a much weaker absorption due to dissolved organic matter and light scattering by particles (Ogura and Hanya, 1966). The UV spectrum thus consists of three components, bromide, nitrate and a background due to organics and particles. The background also includes thermal effects on the instrument and slow drift. All of these latter effects (organics, particles, thermal effects and drift) tend to be smooth spectra that combine to form an absorption spectrum that is linear in wavelength over relatively short wavelength spans. If the light.....
    Resource URL
    http://www.argodatamgt.org/documentation/
    Publisher
    IFREMER for Argo Data Management
    Villefranche-sur-Mer, France
    Document Language
    en
    Essential Ocean Variables (EOV)
    Nutrients
    Maturity Level
    TRL 8 Actual system completed and "mission qualified" through test and demonstration in an operational environment (ground or space)
    Best Practice Type
    Standard Operating Procedure
    Manual
    DOI Original
    10.13155/46121
    Citation
    Johnson, K.; Pasqueron De Fommervault, O.; Serr, R.; D'Ortenzio, F.; Schmechtig, C.; Claustre, H. and Poteau Antoine (2018) Processing Bio-Argo nitrate concentration at the DAC Level. Version 1.1, March 3rd 2018. IFREMER for Argo Data Management, 22pp. DOI: http://doi.org/10.13155/46121
    URI
    http://hdl.handle.net/11329/492
    http://dx.doi.org/10.25607/OBP-74
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    • Argo Community Practices [27]

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