Metabolic balance in the mixed layer of the oligotrophic North Pacific Ocean from diel changes in O2/Ar saturation ratios. Issue 9 (5th May 2015)

• Record Type: Journal Article
• Authors: Ferrón, Sara; Wilson, Samuel T.; Martínez‐García, Sandra; Quay, Paul D.; Karl, David M.
• Is Part Of: Geophysical research letters. Volume 42:Issue 9(2015:May)
• Page Start: 3421
• Page End: 3430
• Publication Date: 2015-05-05
• Subjects: Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2015GL063555
• Languages: English
• ISSNs: 0094-8276

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <p>In situ measurements were made to determine oxygen (O₂) metabolic balance in the upper oligotrophic ocean from diel changes in O₂ 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 O₂ production, estimated from in situ diel changes in O₂/Ar saturation, agreed well with those calculated using other independent methods. Net oxygen production (NOP), estimated from in situ diel changes in O₂/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 ± 9.3 mmol O₂ m⁻² d⁻¹ compared to 11.7 ± 1.1 mmol O₂ m⁻² d⁻¹, respectively).</p> </abstract>