Manganese in surface waters of the Atlantic Ocean

Shiller, Alan M.

doi:10.1029/97gl01456

Cited by 56 publications

(34 citation statements)

References 31 publications

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“…Dissolved Mn is frequently elevated in the surface waters of the low latitudes as a result of atmospheric inputs alongside increased solubility due to photoreduction [114][115][116]. However, concentrations in the surface SO can be very low and are associated with marked near surface depletion [69,100,116] alongside some evidence suggesting the potential for (co-)limitation by this element alongside Fe [110,112,113].…”

Section: (D) Deficiency Beyond N P and Fe: Mn And Znmentioning

confidence: 99%

“…However, concentrations in the surface SO can be very low and are associated with marked near surface depletion [69,100,116] alongside some evidence suggesting the potential for (co-)limitation by this element alongside Fe [110,112,113]. In the context of the large-scale oceanic circulation, strong upwelling of Mn deficient deep waters (more than 600 m) within the SO (figures 4f, 7c,d) may thus contribute to the potential for development of any such Mn (co-)limitation.…”

Section: (D) Deficiency Beyond N P and Fe: Mn And Znmentioning

confidence: 99%

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Diagnosing oceanic nutrient deficiency

Moore¹

2016

Phil. Trans. R. Soc. A.

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Section: (D) Deficiency Beyond N P and Fe: Mn And Znmentioning

confidence: 99%

Section: (D) Deficiency Beyond N P and Fe: Mn And Znmentioning

confidence: 99%

Diagnosing oceanic nutrient deficiency

Moore¹

2016

Phil. Trans. R. Soc. A.

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“…Mn estimates for the Pacific and Atlantic have ranged from a few years to 20 years (Martin et al, 1985(Martin et al, , 1980Martin and Knauer, 1984;Shiller, 1997). Low-end dust-based estimates for Fe in the equatorial Atlantic match more closely with results from this study at 6 days to 62 days (Croot et al, 2004), whereas an estimate for the North Pacific Gyre for the upper 100 m to 200 m were estimated at 6 months to 12 months using a 230 Th-232 Th method and Fe:Th solubility data (Hayes et al, 2015).…”

Section: τTotmentioning

confidence: 99%

An investigation of basin-scale controls on upper ocean export and remineralization

Black¹

2018

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The biological carbon pump (BCP) helps to moderate atmospheric carbon dioxide levels by bringing carbon to the deep ocean, where it can be sequestered on timescales of centuries to millennia. Climate change is predicted to decrease the efficiency of the global BCP, however, the magnitude and timescale of this shift is largely uncertain and will likely impact some areas of the global ocean more significantly than others. Therefore, it is imperative that we (1) accurately quantify surface export and remineralization of particulate organic carbon (POC) via the BCP over large regions of the global ocean, (2) examine the factors controlling these POC fluxes and their variability, which includes the cycling of biologically-relevant trace metals, and (3) establish if and how the BCP is changing over time.This thesis focuses on addressing various aspects of these objectives using the 234 Th-238 U method across basin-scale GEOTRACES transects. First, the export and remineralization of POC were examined across large gradients in productivity, upwelling, community structure, and dissolved oxygen in the southeastern tropical Pacific Ocean. Although low oxygen zones are traditionally thought to have decreased POC flux attenuation relative to other regions of the global ocean and the low oxygen Pacific locations followed this pattern, regions that were functionally anoxic had enhanced attenuation in the upper 400 m. Second, trace metal export and remineralization were quantified across the Pacific transect. Because many trace metals are necessary for the metabolic functions of marine organisms and can co-limit marine productivity, the controls on the cycling of trace metals in the upper ocean were examined. Lastly, POC export was determined across two transects in the Western Arctic Ocean, where light and nutrient availability drive the biological pump. Upper ocean export estimates in the central basin did not reflect a substantial change in the biological pump compared to studies from the last three decades, however, an extensive maximum in 234 Th relative to 238 U deeper in the water column indicated that rapid vertical transport had occurred, which could suggest a more efficient biological pump in the Arctic Ocean.

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“…There are many components to the oceanic Mn cycle (Shiller, 1997;Statham et al, 1998). Rivers (6%), hydrothermal venting (17%), aeolian deposition (3%) and particle weathering (74%) fluxes are the main sources of Mn to the ocean (80 x 109 mol y-) (Bender et al, 1977;Martin and Knauer, 1980).…”

Section: Global Karst Subterranean Estuary Element Fluxesmentioning

confidence: 99%

Temporal variability in chemical cycling of the subterranean estuary and associated chemical loading to the coastal ocean

Gonneea¹

2014

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Manganese in surface waters of the Atlantic Ocean

Cited by 56 publications

References 31 publications

Diagnosing oceanic nutrient deficiency

Diagnosing oceanic nutrient deficiency

An investigation of basin-scale controls on upper ocean export and remineralization

Temporal variability in chemical cycling of the subterranean estuary and associated chemical loading to the coastal ocean

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