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Seguro, Isabel 
ORCID: https://orcid.org/0000-0001-8453-0057, Marca, Alina D., Painting, Suzanne J., Shutler, Jamie D., Suggett, David J and Kaiser, Jan ORCID: https://orcid.org/0000-0002-1553-4043
(2019)
High-resolution net and gross biological production during a Celtic Sea spring bloom.
Progress in Oceanography, 177.
ISSN 0079-6611
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Abstract
Shelf seas represent only 10% of the ocean area, but support up to 30% of all oceanic primary production. There are few measurements of shelf-sea biological production at high spatial and temporal resolution in such heterogeneous and physically dynamic systems. Here, we use dissolved oxygen-to-argon (O2/Ar) ratios and oxygen triple isotopes (16O, 17O, 18O) to estimate net and gross biological production in the Celtic Sea during spring 2015. O2/Ar ratios were measured continuously using a shipboard membrane inlet mass spectrometer (MIMS). Additional discrete water samples from CTD hydrocasts were used to measure O2/Ar depth profiles and the δ(17O) and δ(18O) values of dissolved O2. These high-resolution data were combined with wind-speed based gas exchange parameterisations to calculate biologically driven air-sea oxygen fluxes. After correction for disequilibrium terms and diapycnal diffusion, these fluxes yielded estimates of net community (N(O2/Ar)) and gross O2 production (G(17O)). N(O2/Ar) was spatially heterogeneous and showed predominantly autotrophic conditions, with an average of (33±41) mmol m-2 d-1. G(17O) showed high variability between 0 and 424 mmol m-2 d-1. The ratio of N(O2/Ar) to G(17O), ƒ(O2), was (0.18±0.03) corresponding to 0.34±0.06 in carbon equivalents. We also observed rapid temporal changes in N(O2/Ar), e.g. an increase of 80 mmol m-2 d-1 in less than 6 hours during the spring bloom, highlighting the importance of high-resolution biological production measurements. Such measurements will help reconcile the differences between satellite and in situ productivity observations, and improve our understanding of the biological carbon pump.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | net community production,gross production,ar ratio,oxygen triple isotopes,shelf seas,spring bloom,shelf seas,spring bloom,gross production,ar ratio,oxygen triple isotopes,geology,aquatic science ,/dk/atira/pure/subjectarea/asjc/1900/1907 |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences Faculty of Science > School of Biological Sciences University of East Anglia Research Groups/Centres > Theme - ClimateUEA |
| UEA Research Groups: | Faculty of Science > Research Groups > Atmospheric Chemistry (former - to 2018) Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences |
| Related URLs: | |
| Depositing User: | Pure Connector |
| Date Deposited: | 08 Dec 2017 11:09 |
| Last Modified: | 20 Mar 2023 10:44 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/65722 |
| DOI: | 10.1016/j.pocean.2017.12.003 |
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