Air-Sea Gas Fluxes and Remineralization From a Novel Combination of pH and O2 Sensors on a Glider.

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Date
2021Author
Possenti, Luca
Humphreys, Matthew P.
Bakker, Dorothee C. E.
Cobas-García, Marcos
Fernand, Liam
Lee, Gareth A.
Pallottino, Francesco
Loucaides, Socratis
Mowlem, Matt Charles
Kaiser, Jan
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Accurate, low-power sensors are needed to characterize biogeochemical variability on underwater glider missions. However, the needs for high accuracy and low power consumption can be difficult to achieve together. To overcome this difficulty, we integrated a novel sensor combination into a Seaglider, comprising a spectrophotometric lab-on-a-chip (LoC) pH sensor and a potentiometric pH sensor, in addition to the standard oxygen (O2) optode. The stable, but less frequent (every 10 min) LoC data were used to calibrate the high-resolution (1 s) potentiometric sensor measurements. The glider was deployed for a 10-day pilot mission in August 2019. This represented the first such deployment of either type of pH sensor on a glider. The LoC pH had a mean offset of +0.005±0.008 with respect to pH calculated from total dissolved inorganic carbon content, c(DIC), and total alkalinity, AT, in co-located water samples. The potentiometric sensor required a thermal-lag correction to resolve the pH var.....
Journal
Frontiers in Marine ScienceVolume
8Issue
Article :696772Page Range
19pp.Document Language
enSustainable Development Goals (SDG)
14.aEssential Ocean Variables (EOV)
N/AMaturity Level
Pilot and DemonstratedSpatial Coverage
North SeaDOI Original
10.3389/fmars.2021.696772Citation
Possenti, L., Humphreys, M.P., Bakker, D.C.E., Cobas-García, M., Fernand, L., Lee, G.A., Pallottino, F., Loucaides, S., Mowlem, M.C. and Kaiser, J. (2021) Air-Sea Gas Fluxes and Remineralization from a Novel Combination of pH and O2 Sensors on a Glider. Frontiers in Marine Science, 8:696772, 19pp. DOI: 10.3389/fmars.2021.696772Collections
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