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

Birchill, Antony J., Beaton, A. D., Hull, Tom, Kaiser, Jan, Mowlem, Matt, Pascal, R., Schaap, A., Voynova, Yoana G., Williams, C. and Palmer, M. (2021) Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider. Frontiers in Marine Science, 8. ISSN 2296-7745

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Abstract

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.

Item Type: Article
Uncontrolled Keywords: north sea,seaglider observations,autonomous and remotely operated underwater vehicle,lab on a chip (loc),phosphate,shelf sea biogeochemistry,oceanography,global and planetary change,aquatic science,water science and technology,environmental science (miscellaneous),ocean engineering,sdg 14 - life below water ,/dk/atira/pure/subjectarea/asjc/1900/1910
Faculty \ School: Faculty of Science > School of Environmental Sciences
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Depositing User: LivePure Connector
Date Deposited: 15 Jul 2021 00:18
Last Modified: 17 Nov 2021 04:46
URI: https://ueaeprints.uea.ac.uk/id/eprint/80563
DOI: 10.3389/fmars.2021.698102

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