Dissolved manganese in the Atlantic sector of the Southern Ocean

Middag, Rob; Baar, de Henricus; Laan, Patrick; Cai, Pinghe; Ooijen, Jan C van

doi:10.1016/j.dsr2.2010.10.043

Cited by 133 publications

(171 citation statements)

References 78 publications

Supporting

Mentioning

154

Contrasting

Order By: Relevance

“…Data on the distributions of the macronutrient elements N, P, Si [44,[62][63][64][65][66][67], the micronutrient elements Fe, Mn, Ni, Zn and Cd [64,[68][69][70][71][72][73][74][75][76][77][78][79][80][81][82][83][84] and the non-nutrient element Al [67,85,86] were downloaded from the IDP2014 collection [20] and imported into a Matlab™ environment for analysis. For each sampling location and/or seawater volume/water mass, a ranking of the relative deficiencies of multiple nutrient elements was calculated by dividing observed dissolved concentrations by an assumed 'typical' stoichiometric ratio within newly formed organic (biological) material (figure 1) [11,18].…”

Section: Methodsmentioning

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%

“…Moreover, Mn is estimated to be the 2°deficient nutrient within the surface SO (figure 7d) and is almost as deficient as Fe within the sub-surface SO, as illustrated through consideration of CDW (figure 4f ). Indeed, away from the influence of hydrothermal vents [104], low deep ocean Mn concentrations [69,114] as a consequence of strong oxidative scavenging [94] result in Mn being estimated to be the most deficient nutrient throughout the Atlantic at depths more than 600 m (figure 7c).…”

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

confidence: 99%

See 2 more Smart Citations

Diagnosing oceanic nutrient deficiency

Moore¹

2016

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

Section: Methodsmentioning

confidence: 99%

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%

See 1 more Smart Citation

Diagnosing oceanic nutrient deficiency

Moore¹

2016

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

show abstract

“…Although abundant in the Earth's crust, it is scarce in the oceans, reaching only low nanomolar concentrations in near-surface waters (Landing and Bruland, 1987;Middag et al, 2011). Marine manganese can take the form of insoluble oxides (Mn 3 þ and Mn 4 þ ), as well as the soluble, Mn 2 þ version, which can arise via photochemical reduction of Mn oxides (Sunda and Huntsman, 1994).…”

Section: Introductionmentioning

confidence: 99%

Manganese uptake in marine bacteria; the novel MntX transporter is widespread in Roseobacters, Vibrios, Alteromonadales and the SAR11 and SAR116 clades

2012

View full text Add to dashboard Cite

We showed that two very different manganese transporters occur in various important genera of marine bacteria. The ABC transporter encoded by sitABCD of the model Roseobacter-clade bacterium Ruegeria pomeroyi DSS-3 is required for Mn2+ import and was repressed by the Mur (Manganese uptake regulator) transcriptional regulator in Mn-replete media. Most genome-sequenced Roseobacter strains contain SitABCD, which are in at least two sub-groups, judged by their amino-acid sequences. However, a few Roseobacters, for example, Roseovarius nubinhibens, lack sitABCD, but these contain another gene, mntX, which encodes a predicted inner membrane polypeptide and is preceded by cis-acting Mur-responsive MRS sequences. It was confirmed directly that mntX of Roseovarius nubinhibens encodes a manganese transporter that was required for growth in Mn-depleted media and that its expression was repressed by Mur in Mn-replete conditions. MntX homologues occur in the deduced proteomes of several bacterial species. Strikingly, all of these live in marine habitats, but are in distantly related taxonomic groups, in the γ- and α-proteobacteria. Notably, MntX was prevalent in nearly all strains of Vibrionales, including the important pathogen, Vibrio cholerae. It also occurs in a strain of the hugely abundant Candidatus Pelagibacter (SAR11), and in another populous marine bacterium, Candidatus Puniceispirillum marinum (SAR116). Consistent with this, MntX was abundant in marine bacterial metagenomes, with one sub-type occurring in an as-yet unknown bacterial clade.

show abstract

“…A more complex source-sink interplay has been invoked for hydrothermal activity and their associated plume dispersion in the deep ocean. While for iron (Fe) (Klunder et al, 2011;Conway and John, 2014;Resing et al, 2015) or manganese (Mn) (Middag et al, 2010;Hatta et al, 2015), hydrothermal activities are an important source, REE are scavenged when hydrothermal fluid mixes with seawater (Klinkhammer et al, 1983;German et al, 1991;Elderfield and Schultz, 1996). In addition, a potential influence of hydrothermal activity on the marine Nd isotopic composition has not been documented yet.…”

Section: Introductionmentioning

confidence: 99%

TAG Plume: Revisiting the Hydrothermal Neodymium Contribution to Seawater

et al. 2018

View full text Add to dashboard Cite

We present results on the distribution of ε Nd and [Nd] from the TAG hydrothermal vent field and adjacent locations collected during the GEOTRACES GA03 cruise in October 2011. Our results show that Nd isotopes directly below and above the plume do not significantly deviate from average NADW (ε Nd = −12.3 ± 0.2). Within the plume, however, isotope values are shifted slightly toward more radiogenic values up to ε Nd = −11.4. Interestingly at the same time a significant decrease in [Nd] along with rare earth element (REE) fractionation is observed, indicating enhanced scavenging within the plume despite the change in Nd isotopes. Elemental concentrations of Nd are reduced by 19.6-18.5 pmol/kg, coinciding with the maximum increase of mantle derived helium (xs 3 He) from 0.203 to 0.675 fmol/kg, resulting in an average 1.8 pmol/kg decrease in [Nd] relative to an expected linear increase with depth. The inventory loss of Nd within the plume sums up to 614 nmoles/m 2 , or 6%, if a continuous increase of [Nd] with depth is assumed. Compared to BATS and the western adjacent station USGT11-14, the local inventory loss is even higher at 10%. The tight relationship of xs 3 He increase and [Nd] decrease allows us to estimate scavenging rates at TAG suggesting 40 mol/year are removed within the TAG plume. A global estimate using power output along ocean ridges yields an annual Nd removal of 3.44 × 10 6 mol/year, which is about 71% of riverine and dust flux combined or 6-8% of the estimated global flux of Nd into the ocean. The change in Nd isotopic composition of up to 0.7 more radiogenic ε Nd values suggests an exchange process between hydrothermally derived particles and seawater in which during the removal process an estimated 1.1 mol/year of hydrothermal Nd is contributed to the seawater at the TAG site. This estimate is only 0.1% of the global Nd signal added to the ocean by boundary exchange processes at ocean margins, limiting the ability of changing the Nd isotopic composition on a global scale in contrast to the more significant estimated sink of elemental Nd in hydrothermal plumes from this study.

show abstract

Dissolved manganese in the Atlantic sector of the Southern Ocean

Cited by 133 publications

References 78 publications

Diagnosing oceanic nutrient deficiency

Diagnosing oceanic nutrient deficiency

Manganese uptake in marine bacteria; the novel MntX transporter is widespread in Roseobacters, Vibrios, Alteromonadales and the SAR11 and SAR116 clades

TAG Plume: Revisiting the Hydrothermal Neodymium Contribution to Seawater

Contact Info

Product

Resources

About