Processing Bio-Argo nitrate concentration at the DAC Level. Version 1.1, March 3rd 2018.
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Pasqueron De Fommervaul, Orens
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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.....
PublisherIFREMER for Argo Data Management
Essential Ocean Variables (EOV)Nutrients
Maturity LevelTRL 8 Actual system completed and "mission qualified" through test and demonstration in an operational environment (ground or space)
Best Practice TypeStandard Operating Procedure
CitationJohnson, 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