@article{d0025995e8a74044ab21f9a1f6bb1709,
title = "Exploring ocean biogeochemistry using a lab-on-chip phosphate analyser on an underwater glider",
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.",
keywords = "autonomous and remotely operated underwater vehicle, lab on a chip (LoC), North Sea, phosphate, seaglider observations, shelf sea biogeochemistry, UKRI, NERC, NE/P013899/1",
author = "Birchill, {Antony J.} and Beaton, {A. D.} and Tom Hull and Jan Kaiser and Matt Mowlem and R. Pascal and A. Schaap and Voynova, {Yoana G.} and C. Williams and M. Palmer",
note = "Funding Information: We thank the captain and crew of MRV Scotia and the RV Heincke. We thank John Walk (Ocean Technology and Engineering, National Oceanography Centre), Michael Smart and Steven Woodward (Marine Autonomous Robotic Systems, National Oceanography Centre) for their invaluable input during LoC analyser Seaglider integration and deploying, piloting and recovering the Seaglider. We also thank Christian Ahlers, Alina Zacharzewski, and Tanja Pieplow (Helmholtz-Zentrum Hereon) for helping to collect and analyze discrete nutrient samples. Funding. This research was funded by the National Environment Research Council AlterEco Grant (Grant No. NE/P013899/1). This provided funding for the bulk of the work-deployment of seaglider and fabrication and testing of lab-on-chip analyser. Funding for Heincke cruise was awarded to R?diger R?ttgers and Holger Brix (Hereon), for project ShelfVal. Hereon funding was provided by the Helmholtz Association PACES II Program: Polar regions and coasts in the changing earth system. Funding Information: This research was funded by the National Environment Research Council AlterEco Grant (Grant No. NE/P013899/1). This provided funding for the bulk of the work-deployment of seaglider and fabrication and testing of lab-on-chip analyser. Funding for Heincke cruise was awarded to R{\"u}diger R{\"o}ttgers and Holger Brix (Hereon), for project ShelfVal. Hereon funding was provided by the Helmholtz Association PACES II Program: Polar regions and coasts in the changing earth system. Publisher Copyright: {\textcopyright} Copyright {\textcopyright} 2021 Birchill, Beaton, Hull, Kaiser, Mowlem, Pascal, Schaap, Voynova, Williams and Palmer.",
year = "2021",
month = jul,
day = "13",
doi = "10.3389/fmars.2021.698102",
language = "English",
volume = "8",
journal = "Frontiers in Marine Science",
issn = "2296-7745",
publisher = "Frontiers Media S. A.",
}
