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- W2023689798 abstract "Seasonal upwelling events along the Galician coastline of the North Atlantic furnish the upperwatercolumn with nutrients, resulting in strong summer phytoplankton blooms and the sustenance ofone of Europe’s largest fisheries. The episodic nature of these upwelling events result in considerablechallenges studying the region using traditional shipboard observations. This thesis demonstrates analternative sampling technique, providing high spatial and temporal resolution biogeochemical datathrough the use of an autonomous underwater glidertheSeaglider.SG510 “Orca” was outfitted with sensors to measure dissolved oxygen, temperature,salinity, chlorophyll a (chl a), coloured dissolved organic material (CDOM) and optical backscatter.Deployed for 113 days over summer 2010, Orca completed 17 zonal transects across the shelf,continental slope and open ocean at 42.1° N. Data collected during the campaign was used toassess both the physics of the watercolumn, and the effect these physical processes have on theregion’s biogeochemistry. As part of this biogeochemical study, a novel attempt at calculating netcommunity production (NCP) was completed using an oxygen inventory technique.Two major phytoplankton bloom events occurred during the deployment period, withrespective peak Chl a concentrations of 9.65 and 11.23 mg m3.During these bloom events, NCPvaried between (net autotrophic) values of 25 and 123 (±17 ) mmol m2.d1.Negative values ofNCP were only observed twice for 24 and 60 hours respectively, with a maximum heterotrophy of44(±17) mmol m2d1.Overall, the summer season featured a net autotrophic metabolic balance of+27 mmol m2d1.thus highlighting the importance of the region for net carbon sequestration.Finally, this thesis also demonstrates the success of using autonomous glider platforms for sustainedbiogeochemical and physical observations within a highly dynamic and challenging operationalenvironment with strong currents and considerable shipping traffic." @default.
- W2023689798 created "2016-06-24" @default.
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- W2023689798 date "2013-09-01" @default.
- W2023689798 modified "2023-09-28" @default.
- W2023689798 title "Seaglider observations of biogeochemical variability in the Iberian upwelling system" @default.
- W2023689798 hasPublicationYear "2013" @default.
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