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

Daniel, Anne; Laës-Huon, Agathe; Barus, Carole; Beaton, Alexander; Blandfort, Daniel; Guigues, Nathalie; Knockaert, Marc; Munaron, Dominique; Salter, Ian; Woodward, E. Malcolm S.; Greenwood, Naomi; Achterberg, Eric P.

doi:10.3389/fmars.2019.00773

Cited by 27 publications

(18 citation statements)

References 70 publications

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“…Hence, we adopted a simple substitution method. While the oceanographic community is working toward harmonising the use of in situ nutrient sensors, including providing recommendations for defining the limit of detection (Daniel et al, 2020), it is not yet providing recommendations for non-detect treatment.…”

Section: Lab-on-chip Long Term Performance and Data Screeningmentioning

confidence: 99%

“…In situ techniques enhance the spatial and temporal resolution and coverage, providing marine chemists with a more detailed insight into biogeochemical cycling, and enhance monitoring capabilities (Daniel et al, 2020). Additionally, in situ techniques remove the need for sample preservation (Nightingale et al, 2015), which is a considerable advantage.…”

Section: Introductionmentioning

confidence: 99%

“…Electrochemical PO 4 3− sensor prototypes under development have the potential to offer small, low power, and reagent free detection. However, current prototypes are not sufficiently developed for large scale use (Jońca et al, 2013;Daniel et al, 2020;Wei et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider

et al. 2021

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The ability to make measurements of phosphate (PO43–) concentrations at temporal and spatial scales beyond those offered by shipboard observations offers new opportunities for investigations of the marine phosphorus cycle. We here report the first in situ PO43– dataset from an underwater glider (Kongsberg Seaglider) equipped with a PO43– Lab-on-Chip (LoC) analyser. Over 44 days, a 120 km transect was conducted in the northern North Sea during late summer (August and September). Surface depletion of PO43– (<0.2 μM) was observed above a seasonal thermocline, with elevated, but variable concentrations within the bottom layer (0.30–0.65 μM). Part of the variability in the bottom layer is attributed to the regional circulation and across shelf exchange, with the highest PO43– concentrations being associated with elevated salinities in northernmost regions, consistent with nutrient rich North Atlantic water intruding onto the shelf. Our study represents a significant step forward in autonomous underwater vehicle sensor capabilities and presents new capability to extend research into the marine phosphorous cycle and, when combined with other recent LoC developments, nutrient stoichiometry.

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Section: Lab-on-chip Long Term Performance and Data Screeningmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider

et al. 2021

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“…Over the past 30 years, advances in technology and analytical chemistry have allowed the development of submersible analyzers for marine waters that can provide in situ NO 3 − measurements. To date, wet-chemical colorimetric analyzers and ultraviolet (UV) optical sensor technologies are available for marine water applications (Daniel et al, 2020). These sensors allow autonomous NO 3 − analysis in marine waters on various platforms and at enhanced temporal and spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

“…To date, the OPUS is lacking a reliable sensor calibration and data processing approach for marine waters. There is nevertheless a need to standardize the handling of the raw spectral data of the sensors to ensure the output data is comparable among different studies that cover different regions of the global ocean (Daniel et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Improved Calibration and Data Processing Procedures of OPUS Optical Sensor for High-Resolution in situ Monitoring of Nitrate in Seawater

et al. 2021

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Nitrate, an essential nutrient for primary production in natural waters, is optically detectable in the ultraviolet spectral region of 217–240 nm, with no chemical reagents required. Optical nitrate sensors allow monitoring at high temporal and spatial resolutions that are difficult to achieve with traditional approaches involving collection of discrete water samples followed by wet-chemical laboratory analysis. The optical nitrate measurements are however subject to matrix interferences in seawater, including bromide, at the spectral range of interest. Significant progress has been made over the last 10 years in improving data quality for seawater nitrate analysis using the ISUS and SUNA (Seabird Scientific, United States) optical sensors. Standardization of sensor calibration and data processing procedures are important for ensuring comparability of marine nitrate data reported in different studies. Here, we improved the calibration and data processing of the OPUS sensor (TriOS GmbH, Germany), and tested five OPUS sensors simultaneously deployed under identical conditions in the laboratory in terms of inter-sensor similarities and differences. We also improved the sampling interval of the OPUS to 3 s in a continuous mode by a custom-built controller, which facilitates the integration of the sensor into autonomous profiling systems. Real-time, high-resolution, in situ measurements were conducted through (1) underway surface measurements in the southeastern North Sea and (2) depth profiles on a conductivity–temperature–depth frame in the tropical Atlantic Ocean. The nitrate data computed from the optical measurements of the sensor agreed with data from discrete water samples analyzed via conventional wet-chemical methods. This work demonstrates that the OPUS sensor, with improved calibration and data processing procedures, allows in situ quantification of nitrate concentrations in dynamic coastal waters and the open ocean, with an accuracy better than ∼2 μM and short-term precision of 0.4 μM NO3–. The OPUS has a unique depth rating of 6,000 m and is a good and cost-effective nitrate sensor for the research community.

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Perspective for the Conservation of Coral Reefs in the East China Sea

Takeuchi

2023

Coral Reefs of the World

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

Abstract: emphasizes the necessity of future collaborations between research groups, referenceaccredited laboratories, and technology developers, to maintain comparability of the concentrations reported for the various nutrient parameters measured by in situ sensors.

Cited by 27 publications

References 70 publications

Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider

Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider

Improved Calibration and Data Processing Procedures of OPUS Optical Sensor for High-Resolution in situ Monitoring of Nitrate in Seawater

Perspective for the Conservation of Coral Reefs in the East China Sea

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