Automated on-line flow-injection ICP-MS determination of trace metals (Mn, Fe, Co, Ni, Cu and Zn) in open ocean seawater: Application to the GEOTRACES program

Lagerström, Maria; Field, M. Paul; Séguret, Marie J.M.; Fischer, Lisa; Hann, Stephan; Sherrell, Robert M.

doi:10.1016/j.marchem.2013.06.001

Cited by 156 publications

(83 citation statements)

References 36 publications

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“…Seawater samples were prepared for analysis of dissolved Fe and other trace metals at Rutgers University using the commercially available version of an automated preconcentration and matrix elimination system (SeaFAST pico®, ESI, Omaha, NB) which operates on the same principle as reported in Lagerström et al . [], and employs the method of isotope dilution, but collects eluates offline rather than directly analyzing online.…”

Section: Methodsmentioning

confidence: 99%

Mixing and phytoplankton dynamics in a submarine canyon in the West Antarctic Peninsula

et al. 2016

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Bathymetric depressions (canyons) exist along the West Antarctic Peninsula shelf and have been linked with increased phytoplankton biomass and sustained penguin colonies. However, the physical mechanisms driving this enhanced biomass are not well understood. Using a Slocum glider data set with over 25,000 water column profiles, we evaluate the relationship between mixed layer depth (MLD, estimated using the depth of maximum buoyancy frequency) and phytoplankton vertical distribution. We use the glider deployments in the Palmer Deep region to examine seasonal and across canyon variability. Throughout the season, the ML becomes warmer and saltier, as a result of vertical mixing and advection. Shallow ML and increased stratification due to sea ice melt are linked to higher chlorophyll concentrations. Deeper mixed layers, resulting from increased wind forcing, show decreased chlorophyll, suggesting the importance of light in regulating phytoplankton productivity. Spatial variations were found in the canyon head region where local physical water column properties were associated with different biological responses, reinforcing the importance of local canyon circulation in regulating phytoplankton distribution in the region. While the mechanism initially hypothesized to produce the observed increases in phytoplankton over the canyons was the intrusion of warm, nutrient enriched modified Upper Circumpolar Deep Water (mUCDW), our analysis suggests that ML dynamics are key to increased primary production over submarine canyons in the WAP.

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Section: Methodsmentioning

confidence: 99%

Mixing and phytoplankton dynamics in a submarine canyon in the West Antarctic Peninsula

et al. 2016

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“…Dissolved iron concentrations in the western South Pacific were determined using a high-resolution inductively coupled plasma-mass spectrometer (Finnigan ELEMENT2, Thermo Electron Co.) following protocols of Lagerström et al (2013). Dissolved iron concentrations in the eastern South Pacific were determined by catalytic stripping voltammetry (Obata & (3-[4-(2-hydroxyethyl)piperazin-1-yl]propane-1-sulfonic acid) by POPSO (piperazine-N,N 0 -bis (2-hydroxypropanesulfonic acid); Sato et al, 2007).…”

Section: Dissolved Ironmentioning

confidence: 99%

Linkage Between Dinitrogen Fixation and Primary Production in the Oligotrophic South Pacific Ocean

Shiozaki

Bombar

Riemann

et al. 2018

Global Biogeochemical Cycles

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The import of nitrogen via dinitrogen fixation supports primary production, particularly in the oligotrophic ocean; however, to what extent dinitrogen fixation influences primary production, and the role of specific types of diazotrophs, remains poorly understood. We examined the relationship between primary production and dinitrogen fixation together with diazotroph community structure in the oligotrophic western and eastern South Pacific Ocean and found that dinitrogen fixation was higher than nitrate‐based new production. Primary production increased in the middle of the western subtropical region, where the cyanobacterium Trichodesmium dominated the diazotroph community and accounted for up to 7.8% of the phytoplankton community, and the abundance of other phytoplankton taxa (especially Prochlorococcus) was high. These results suggest that regenerated production was enhanced by nitrogen released from Trichodesmium and that carbon fixation by Trichodesmium also contributed significantly to total primary production. Although volumetric dinitrogen fixation was comparable between the western and eastern subtropical regions, primary production in the western waters was more than twice as high as that in the eastern waters, where UCYN‐A1 (photoheterotroph) and heterotrophic bacteria were the dominant diazotrophs. This suggests that dinitrogen fixed by these diazotrophs contributed relatively little to primary production of the wider community, and there was limited carbon fixation by these diazotrophs. Hence, we document how the community composition of diazotrophs in the field can be reflected in how much nitrogen becomes available to the wider phytoplankton community and in how much autotrophic diazotrophs themselves fix carbon and thereby influences the magnitude of local primary production.

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“…Seawater samples were analyzed for dissolved Fe, Mn, Zn, Cu and Ni over the period of January to August 2012, using an automated flow injection ICP-MS method developed at Rutgers University (Lagerström et al, 2013). Briefly, the automated device loaded a 9 mL aliquot of seawater, buffered online to pH 7.0 with 3 mL of acetic acid/ammonium hydroxide buffer, onto a column packed with Nobias PA1 chelating resin (Hitachi High-Technologies).…”

Section: Dissolved Trace Metal Analysismentioning

confidence: 99%

“…The long-term precision over many analytical runs over a period of months, as demonstrated by repeated analysis of a large volume in-house seawater standard from the Ross Sea (analyzed 5-6 times during each analytical session), was 1% for Ni and Cu, 2% for Zn and 3% for Fe and Mn (RSD; see Table 3 in Lagerström et al, 2013). Accuracy was verified by repeated analysis of reference seawater materials (SAFe S and D2, GEOTRACES S and D), which showed agreement within one standard deviation of the consensus values for almost all elements in all reference seawaters (see Table 5 in Lagerström et al, 2013).…”

Section: Dissolved Trace Metal Analysismentioning

confidence: 99%

Dynamics of dissolved iron and other bioactive trace metals (Mn, Ni, Cu, Zn) in the Amundsen Sea Polynya, Antarctica

Sherrell

Lagerström

Forsch

et al. 2015

Elementa: Science of the Anthropocene

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123

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The Amundsen Sea Polynya is experiencing large increases in glacial meltwater input and hosts an extremely productive and long-lasting summer phytoplankton bloom, suggesting a crucial role for natural Fe fertilization. Early summer distributions and dynamics of the dissolved bioactive metals Fe, Mn, Zn, Cu and Ni were investigated during a three week period in 2010-2011, using GEOTRACES-compliant methods. Dissolved Fe was very low (0.06-0.12 nmol kg −1 ) in the upper 20 m of the central polynya, suggesting that the sub-maximal rates of in situ primary productivity reported previously for this growth phase of the bloom are attributable to insufficient Fe availability. Weeks after the sampling period, phytoplankton biomass accumulated to peak bloom conditions, implying a continuous supply of bioavailable Fe to the euphotic zone. The dominant biologically-relevant Fe source was meltwater-enriched seawater flowing from the Dotson Ice Shelf cavity and delivering Fe at 0.7 nmol kg −1 to the broader polynya. The modest Fe content of Circumpolar Deep Water (CDW; 0.3 nmol kg −1 ), invading through cross-shelf troughs, was strongly augmented by benthic Fe inputs, which may combine with glacial meltwater dFe in the Dotson outflow. Sea ice melting provided a modest local Fe flux, insufficient to drive large annual blooms. Dissolved Mn was strongly reduced in surface waters, but displayed a subsurface maximum likely advected through the region from shallow coastal sediments. Nutrient-type elements Zn, Cu and Ni had large to small dynamic ranges, respectively, and increasing concentrations with depth, indicating uptake and remineralization within the polynya system. Surface water drawdown ratios of metals and nutrients provided novel estimates of metal quotas (metal/P) for the dominant bloom phytoplankton, Phaeocystis antarctica. At one unique mature bloom station, Zn and Cu were scavenged to low concentrations throughout the 350 m water column, a possible result of intense removal onto sinking Phaeocystis biodetritus. The Amundsen Sea appears to be a model region for studying the biogeochemical consequences of increased glacial meltwater inputs.

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Automated on-line flow-injection ICP-MS determination of trace metals (Mn, Fe, Co, Ni, Cu and Zn) in open ocean seawater: Application to the GEOTRACES program

Cited by 156 publications

References 36 publications

Mixing and phytoplankton dynamics in a submarine canyon in the West Antarctic Peninsula

Mixing and phytoplankton dynamics in a submarine canyon in the West Antarctic Peninsula

Linkage Between Dinitrogen Fixation and Primary Production in the Oligotrophic South Pacific Ocean

Dynamics of dissolved iron and other bioactive trace metals (Mn, Ni, Cu, Zn) in the Amundsen Sea Polynya, Antarctica

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