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Metabolic balance in the mixed layer of the oligotrophic North Pacific Ocean from diel changes in O2/Ar saturation ratios
University of Hawai‘i at Mānoa, USA.
University of Hawai‘i at Mānoa, USA.
University of Hawai‘i at Mānoa, USA. (Ctr Ecol & Evolut Microbial Model Syst EEMiS)
University of Washington, USA.
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2015 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 42, no 9, p. 3421-3430Article in journal (Refereed) Published
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Text
Abstract [en]

In situ measurements were made to determine oxygen (O<inf>2</inf>) metabolic balance in the upper oligotrophic ocean from diel changes in O<inf>2</inf> to argon (Ar) ratios. The study took place during 13-24 March 2014, at the Hawaii Ocean Time-series Station ALOHA (A Long-term Oligotrophic Habitat Assessment), in the North Pacific Subtropical Gyre. Microbial community respiration and gross O<inf>2</inf> production, estimated from in situ diel changes in O<inf>2</inf>/Ar saturation, agreed well with those calculated using other independent methods. Net oxygen production (NOP), estimated from in situ diel changes in O<inf>2</inf>/Ar saturation, showed large day-to-day variability. However, when averaged over the entire observational period, mean diel NOP was in relatively good agreement with the estimated mean steady state NOP (9.2±9.3mmolO<inf>2</inf>m-2d-1 compared to 11.7±1.1mmolO<inf>2</inf>m-2d-1, respectively). Key Points Diel changes in O<inf>2</inf>/Ar were used to determine mixed layer ecosystem metabolism Estimated metabolic rates agreed well with other independent methods There was a net production of O<inf>2</inf> in the mixed layer during the sampling period.

Place, publisher, year, edition, pages
2015. Vol. 42, no 9, p. 3421-3430
Keywords [en]
net community production, North Pacific Subtropical Gyre, O2/Ar, oligotrophic ocean, respiration, Station ALOHA
National Category
Geophysics
Research subject
Natural Science
Identifiers
URN: urn:nbn:se:lnu:diva-55334DOI: 10.1002/2015GL063555ISI: 000355878300045Scopus ID: 2-s2.0-84930484087OAI: oai:DiVA.org:lnu-55334DiVA, id: diva2:951951
Available from: 2016-08-11 Created: 2016-08-10 Last updated: 2018-10-24Bibliographically approved

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Martínez-García, Sandra

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