Toward a Harmonization for Using in situ Nutrient Sensors in the Marine Environment

Anne Daniel, Agathe Laës-Huon, Carol Barus, Alexander Beaton, Daniel Blandfort, Nathalie Guiges, Marc Knockaert, Dominique Muraron, Ian Salter, Malcom Woodward, Naomi Greenwood, Eric Achterberg

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Improved comparability of nutrient concentrations in seawater is required to enhance the quality and utility of measurements reported to global databases. Significant progress has been made over recent decades in improving the analysis and data quality for traditional laboratory measurements of nutrients. Similar efforts are required to establish high-quality data outputs from in situ nutrient sensors, which are rapidly becoming integral components of ocean observing systems. This paper suggests using the good practices routine established for laboratory reference methods to propose a harmonized set of deployment protocols and of quality control procedures for nutrient measurements obtained from in situ sensors. These procedures are intended to establish a framework to standardize the technical and analytical controls carried out on the three main types of in situ nutrient sensors currently available (wet chemical analyzers, ultraviolet optical sensors, electrochemical sensors) for their deployments on all kinds of platform. The routine reference controls that can be applied to the sensors are listed for each step of sensor use: initial qualification under controlled conditions in the laboratory, preparation of the sensor before deployment, field deployment and finally the sensor recovery. The fundamental principles applied to the laboratory reference method are then reviewed in terms of the calibration protocol, instrumental interferences, environmental interferences, external controls, and method performance assessment. Data corrections (linearity, sensitivity, drifts, interferences and outliers) are finally identified along with the concepts and calculations for qualification for both real time and time delayed data. This paper emphasizes the necessity of future collaborations between research groups, reference accredited laboratories, and technology developers, to maintain comparability of the concentrations reported for the various nutrient parameters measured by in situ sensors.
Original languageEnglish
Article number773
Pages (from-to)1-22
Number of pages22
JournalFrontiers in Marine Science
Volume6
DOIs
Publication statusPublished - 21 Jan 2020

Keywords

  • Sensor Technology
  • Nutrient biogeochemistry
  • Autonomous Sampling
  • JERICO
  • nutrient
  • EOVs
  • in situ sensor
  • data comparabilit
  • marine biogeochemistry
  • , ocean observing systems

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