High-resolution net and gross biological production during a Celtic Sea spring bloom

Seguro, I; Marca, AD; Painting, SJ; Shutler, JD; Suggett, DJ; Kaiser, J

High-resolution net and gross biological production during a Celtic Sea spring bloom

Seguro, I Marca, AD Painting, SJ Shutler, JD Suggett, DJ

Kaiser, J

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Publication Type:: Journal Article
Citation:: Progress in Oceanography, 2019, 177
Issue Date:: 2019-10-01

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Field	Value	Language
dc.contributor.author	Seguro, I	en_US
dc.contributor.author	Marca, AD	en_US
dc.contributor.author	Painting, SJ	en_US
dc.contributor.author	Shutler, JD	en_US
dc.contributor.author	Suggett, DJ https://orcid.org/0000-0001-5326-2520	en_US
dc.contributor.author	Kaiser, J	en_US
dc.date.issued	2019-10-01	en_US
dc.identifier.citation	Progress in Oceanography, 2019, 177	en_US
dc.identifier.issn	0079-6611	en_US
dc.identifier.uri	http://hdl.handle.net/10453/136258
dc.description.abstract	© 2017 The Authors 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 <6 h 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.	en_US
dc.relation	http://purl.org/au-research/grants/arc/FT130100202
dc.relation.ispartof	Progress in Oceanography	en_US
dc.relation.isbasedon	10.1016/j.pocean.2017.12.003	en_US
dc.subject.classification	Oceanography	en_US
dc.title	High-resolution net and gross biological production during a Celtic Sea spring bloom	en_US
dc.type	Journal Article
utslib.citation.volume	177	en_US
utslib.for	0405 Oceanography	en_US
utslib.for	0403 Geology	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.publication-status	Published	en_US
pubs.volume	177	en_US

Abstract:

© 2017 The Authors 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 <6 h 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.

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