Data_Sheet_1_Exploring Ocean Biogeochemistry Using a Lab-on-Chip Phosphate Analyser on an Underwater Glider.PDF

• Main Authors: Antony J. Birchill (6247553), A. D. Beaton (11120565), Tom Hull (5287216), Jan Kaiser (2510149), Matt Mowlem (6505559), R. Pascal (11120568), A. Schaap (11120571), Yoana G. Voynova (11120574), C. Williams (7648361), M. Palmer (7481321)
• Format: Dataset
• Language: unknown
• Published: 2021
• Subjects: Oceanography; Marine Biology; Marine Geoscience; Biological Oceanography; Chemical Oceanography; Physical Oceanography; Marine Engineering; Seaglider observations; phosphate; lab on a chip (LoC); North Sea; shelf sea biogeochemistry; autonomous and remotely operated underwater vehicle; Kongsberg; North Atlantic
• Online Access: https://doi.org/10.3389/fmars.2021.698102.s001

The ability to make measurements of phosphate (PO 4 3– ) 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 PO 4 3– dataset from an underwater glider (Kongsberg Seaglider) equipped with a PO 4 3– 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 PO 4 3– (<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 PO 4 3– 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.