Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider

Hull, Tom, Greenwood, Naomi, Birchill, Antony, Beaton, Alexander, Palmer, Matthew and Kaiser, Jan ORCID: (2021) Simultaneous assessment of oxygen- and nitrate-based net community production in a temperate shelf sea from a single ocean glider. Biogeosciences, 18 (23). pp. 6167-6180. ISSN 1726-4189

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The continental shelf seas are important at a global scale for ecosystem services. These highly dynamic regions are under a wide range of stresses, and as such future management requires appropriate monitoring measures. A key metric to understanding and predicting future change are the rates of biological production. We present here the use of an autonomous underwater glider with an oxygen (O2) and a wet-chemical microfluidic total oxidised nitrogen (NOx-NO3-+NO2-) sensor during a spring bloom as part of a 2019 pilot autonomous shelf sea monitoring study. We find exceptionally high rates of net community production using both O2 and NOx-water column inventory changes, corrected for air-sea gas exchange in case of O2. We compare these rates with 2007 and 2008 mooring observations finding similar rates of NOx-consumption. With these complementary methods we determine the O2:N amount ratio of the newly produced organic matter (7.8g±0.4) and the overall O2:N ratio for the total water column (5.7g±0.4). The former is close to the canonical Redfield O2:N ratio of 8.6g±1.0, whereas the latter may be explained by a combination of new organic matter production and preferential remineralisation of more reduced organic matter at a higher O2:N ratio below the euphotic zone.

Item Type: Article
Additional Information: Funding Information: The glider work was funded by the UK National Environment Research Council (NERC; grant numbers NE/P013899/1, NE/P013902/2, NE/P013740/1, NE/P013864/1); the UK government’s Department for Environment, Food and Rural Affairs (Defra); and the World Wide Fund for Nature (WWF). The North Dogger SmartBuoy was funded by Defra (grant nos. ME3205 and SLA25).
Uncontrolled Keywords: ecology, evolution, behavior and systematics,earth-surface processes ,/dk/atira/pure/subjectarea/asjc/1100/1105
Faculty \ School: Faculty of Science > School of Environmental Sciences
University of East Anglia Research Groups/Centres > Theme - ClimateUEA
UEA Research Groups: Faculty of Science > Research Groups > Collaborative Centre for Sustainable Use of the Seas
Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences
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Depositing User: LivePure Connector
Date Deposited: 13 Dec 2021 08:30
Last Modified: 20 Mar 2023 10:50
DOI: 10.5194/bg-18-6167-2021


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