The effect of surface flooding on the physical–biogeochemical dynamics of a warm-core eddy off southeast Australia

Baird, Mark E.; Suthers, Iain M.; Griffin, David A.; Hollings, Ben; Pattiaratchi, Charitha; Everett, Jason D.; Roughan, Moninya; Oubelkheir, Kadija; Doblin, Martina A.

doi:10.1016/j.dsr2.2010.10.002

Cited by 51 publications

(42 citation statements)

References 51 publications

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“…High b values indicate steep and therefore local flux attenuation in the upper layer which, in our case, could be explained by the vertical structure of the ACME with its well-isolated local core. Again, our findings for flux attenuation are comparable to those obtained during a North Atlantic bloom experiment (Berelson, 2001), but also to observations recently conducted in the North Atlantic subtropical gyre (Marsay et al, 2015). Controversial discussions in the scientific literature exist about different dependencies of the b parameter.…”

Section: Oxygen Utilization and Carbon Exportsupporting

confidence: 75%

“…POC fluxes derived here generally show higher values than those found in other open-ocean studies but are comparable to values associated with a North Atlantic spring bloom event (Berelson, 2001). Moreover, POC fluxes for this ACME were also in line with estimates made for other eddies, such as enhanced POC fluxes determined at the rim of a CE in the Western Pacific (Shih et al, 2015) or inside a CE in the ETNA (Fig.…”

Section: Oxygen Utilization and Carbon Exportsupporting

confidence: 67%

“…Physical transport processes in frontal regions and mesoscale eddies have been found to generate biogeochemical responses that are very different from the general background conditions (Baird et al, 2011;Mahadevan, 2014;Stramma et al, 2013). A key process in driving the generation of anomalies is the vertical flux of nutrients into the euphotic zone, which enhances primary productivity, a process that is of particular importance in usually oligotrophic environments (Falkowski et al, 1991;McGillicuddy et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Oxygen utilization and downward carbon flux in an oxygen-depleted eddy in the eastern tropical North Atlantic

et al. 2016

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Abstract. The occurrence of mesoscale eddies that develop suboxic environments at shallow depth (about 40-100 m) has recently been reported for the eastern tropical North Atlantic (ETNA). Their hydrographic structure suggests that the water mass inside the eddy is well isolated from ambient waters supporting the development of severe near-surface oxygen deficits. So far, hydrographic and biogeochemical characterization of these eddies was limited to a few autonomous surveys, with the use of moorings, underwater gliders and profiling floats. In this study we present results from the first dedicated biogeochemical survey of one of these eddies conducted in March 2014 near the Cape Verde Ocean Observatory (CVOO). During the survey the eddy core showed oxygen concentrations as low as 5 µmol kg −1 with a pH of around 7.6 at approximately 100 m depth. Correspondingly, the aragonite saturation level dropped to 1 at the same depth, thereby creating unfavorable conditions for calcifying organisms. To our knowledge, such enhanced acidity within near-surface waters has never been reported before for the open Atlantic Ocean. Vertical distributions of particulate organic matter and dissolved organic matter (POM and DOM), generally showed elevated concentrations in the surface mixed layer (0-70 m), with DOM also accumulating beneath the oxygen minimum. With the use of reference data from the upwelling region where these eddies are formed, the oxygen utilization rate was calculated by determining oxygen consumption through the remineralization of organic matter. Inside the core, we found these rates were almost 1 order of magnitude higher (apparent oxygen utilization rate (aOUR); 0.26 µmol kg −1 day −1 ) than typical values for the open North Atlantic. Computed downward fluxes for particulate organic carbon (POC), were around 0.19 to 0.23 g C m −2 day −1 at 100 m depth, clearly exceeding fluxes typical for an oligotrophic open-ocean setting. The observations support the view that the oxygen-depleted eddies can be viewed as isolated, westwards propagating upwelling systems of their own, thereby represent re-occurring alien biogeochemical environments in the ETNA.

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Section: Oxygen Utilization and Carbon Exportsupporting

confidence: 75%

Section: Oxygen Utilization and Carbon Exportsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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Oxygen utilization and downward carbon flux in an oxygen-depleted eddy in the eastern tropical North Atlantic

et al. 2016

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“…These include: (1) physical and biogeochemical studies of offshore eddies (Baird et al, 2011), (2) characterization of internal tides and sediment resuspension (Boettger et al, 2015;Pattiaratchi and De Oliveira, 2016), and (3) examination of the influence of the East Australian Current on shelf dynamics (Schaeffer and Roughan, 2015). Schaeffer et al (2016) compiled a shelf climatology using Slocum glider data, and Jones et al (2012) 2016).…”

Section: Science Highlightsmentioning

confidence: 99%

Ocean Glider Observations Around Australia

et al. 2017

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“…WSP is characterized as the presence of meso-scale eddies formed from EAC [25]; warm eddies, containing poor nutrients, are oligotrophic, whereas cold eddies contain nutrient-rich waters [26]. SPSG appears to be the most oligotrophic and stable body [27].…”

Section: Introductionmentioning

confidence: 99%

Spatial Distribution of the Particulate Organic Ligand in the South Pacific Ocean Surface Waters

Hirose¹,

Saito²,

Pp³

2013

Oceanography

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The effect of surface flooding on the physical–biogeochemical dynamics of a warm-core eddy off southeast Australia

Cited by 51 publications

References 51 publications

Oxygen utilization and downward carbon flux in an oxygen-depleted eddy in the eastern tropical North Atlantic

Oxygen utilization and downward carbon flux in an oxygen-depleted eddy in the eastern tropical North Atlantic

Ocean Glider Observations Around Australia

Spatial Distribution of the Particulate Organic Ligand in the South Pacific Ocean Surface Waters

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