Distribution of Cd, Pb and Cu between dissolved fraction, inorganic particulate and phytoplankton in seawater of Terra Nova Bay (Ross Sea, Antarctica) during austral summer 2011–12

Illuminati, Silvia; Annibaldi, Anna; Romagnoli, Tiziana; Libani, Giulia; Antonucci, Matteo; Scarponi, Giuseppe; Totti, Cecilia; Truzzi, Cristina

doi:10.1016/j.chemosphere.2017.07.087

Cited by 22 publications

(14 citation statements)

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“…Most of the dissolved Cu observations were taken from the GEOTRACES Intermediate Data Product 2017 (version 2; Mawji et al, 2015; Schlitzer et al, 2018; individually published in Heller & Croot, 2015; Jacquot & Moffett, 2015; Little et al, 2018; Roshan & Wu, 2015, 2018), plus some non‐GEOTRACES data (individually published in Bruland, 1980; Danielsson et al, 1985; Ezoe et al, 2004; Fitzwater et al, 2000; Fujishima et al, 2001; Illuminati et al, 2017; Jacquot et al, 2013; Lai et al, 2008; Löscher, 1999; Martin et al, 1993; Moore, 1978; Nolting & De Baar, 1994; Nolting et al, 1991; Posacka et al, 2017; Saager et al, 1992, 1997; Sanudo‐Wilhelmy et al, 2002; Yeats & Campbell, 1983). In this study, we also determined dissolved Cu concentration along a meridional transect in the tropical‐subtropical Pacific (stations inside brown contour in supporting information Figure S1), applying the method of Mg (OH) 2 coprecipitation combined with isotope dilution mass spectrometry (Wu & Boyle, 1997; details of blank and standard seawater measurements are very similar to those reported in Roshan & Wu, 2015, 2018).…”

Section: Methodsmentioning

confidence: 99%

Constraining the Global Ocean Cu Cycle With a Data‐Assimilated Diagnostic Model

Roshan

DeVries

2020

Global Biogeochemical Cycles

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Copper (Cu) is a biologically important trace metal for marine plankton, but it is also toxic at high concentrations. Understanding the global distribution of Cu and the processes controlling its cycling in the ocean is important for understanding how the distribution of this important element can respond to climate change. Here, we use available observations of dissolved copper, an artificial neural network, and an ocean circulation inverse model, to derive a global estimate of the three-dimensional distribution and cycling of dissolved Cu in the ocean. We find that there is net removal by bio-assimilation and/or scavenging of dissolved Cu in the surface ocean at a rate of~1.7 Gmol yr −1 and that both the concentration and export of dissolved Cu are highest in the Southern Ocean. In the subsurface above the near-sediment layer, dissolved Cu is removed at a net rate of~2.4 Gmol yr −1 , consistent with scavenging onto sinking particles, contributing to an increase in the flux of particulate Cu with depth. This removal of Cu by scavenging in the interior ocean is balanced by a net near-sediment source of dissolved Cu, which sustains a gradual increase in the concentration of dissolved Cu with depth. Globally, this net near-sediment source is estimated at~2.6 Gmol yr −1 in the deep ocean and~0.8 Gmol yr −1 along continental shelves and slopes. Our results suggest an active oceanic dissolved Cu cycle with a mean internal ocean residence time of~530 years, highlighting the potential for climate-driven changes in the marine Cu cycle.

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Section: Methodsmentioning

confidence: 99%

Constraining the Global Ocean Cu Cycle With a Data‐Assimilated Diagnostic Model

Roshan

DeVries

2020

Global Biogeochemical Cycles

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“…Accuracy of the measurements carried out in our laboratory is usually checked by the analysis of various certified reference materials (CRMs) [ 71 , 73 , 74 , 75 , 76 ]. Since no certified reference material was available for PHg determination in atmospheric particulate matter, the accuracy of the measurements was checked by computing the percentage of recovery by triplicate analyses of filters spiked with Hg standard solutions in two Hg(II) mass levels (typically, 0.30 ng and 1.0 ng).…”

Section: Methodsmentioning

confidence: 99%

Seasonal Evolution of Size-Segregated Particulate Mercury in the Atmospheric Aerosol Over Terra Nova Bay, Antarctica

et al. 2020

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Size-fractionated particulate mercury (PHg) measurements were performed from November 2017 to January 2018 at Terra Nova Bay (Antarctica) for the first time. Samples were collected every 10 days by a six-stage high-volume cascade impactor with size classes between 10 μm and 0.49 μm. Total PHg concentrations were maxima (87 ± 8 pg m−3) in November, then decreased to values ~40% lower and remained almost constant until the end of the sampling period (~30 pg m−3). The trimodal aerosol mass distribution reveals that from 30% to 90% of the total PHg came in the size > 1.0 μm. Hg in the two coarse fractions was probably produced by the adsorption of oxidized Hg species transported by air masses from the Antarctic plateau or produced locally by sea ice edges. PHg in accumulation mode seemed to be related to gas–particle partitioning with sea salt aerosol. Finally, average dry deposition fluxes of PHg were calculated to be 0.36 ± 0.21 ng m−2 d−1 in the accumulation mode, 47 ± 44 ng m−2 d−1 in the first coarse mode, and 37 ± 31 ng m−2 d−1 in the second coarse mode. The present work contributed to the comprehension of the Hg biogeochemical cycle, but further research studies are needed.

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“…Lead was the only element with an opposite trend, significantly decreasing as the δ 13 C increased in both primary and secondary consumers, suggesting that settled phytoplankton, macroalgae and sediment represent also important Pb sources for invertebrates in Tethys Bay. Lead is defined as a "scavenging type" element that typically shows increasing concentration at higher depths (Frache et al, 2001;Illuminati et al, 2017), hence this behaviour may have contributed to the observed patterns. Indeed, Illuminati et al, (2017) found that the effect of the sea ice melting on Pb seawater content is not relevant in summer, being the surface water layer (~15 m depth) mostly interested by atmospheric deposition and wet deposition from continental land (Dalla Riva et al, 2003), while the sinking of biogenic particles following the phytoplankton bloom affects the Pb level in the deeper layers (~100m -same maximum depth where the phytoplankton was sampled in this study).…”

Section: Horizontal and Vertical Food Web Structure Drives Trace Element Transfermentioning

confidence: 99%

“…Lead is defined as a "scavenging type" element that typically shows increasing concentration at higher depths (Frache et al, 2001;Illuminati et al, 2017), hence this behaviour may have contributed to the observed patterns. Indeed, Illuminati et al, (2017) found that the effect of the sea ice melting on Pb seawater content is not relevant in summer, being the surface water layer (~15 m depth) mostly interested by atmospheric deposition and wet deposition from continental land (Dalla Riva et al, 2003), while the sinking of biogenic particles following the phytoplankton bloom affects the Pb level in the deeper layers (~100m -same maximum depth where the phytoplankton was sampled in this study). Our isotopic results, in agreement with literature findings (Elias-Piera et al, 2013;Norkko et al, 2007), support the hypothesis that benthic macroalgae, sediment and phytodetritus are important organic matter sources in the trophic web of Tethys Bay, hence representing relevant sources of Pb for many organisms with potential detrimental effects.…”

Section: Horizontal and Vertical Food Web Structure Drives Trace Element Transfermentioning

confidence: 99%

“…As sediment is a sink for contaminants, its resuspension together with upwelling of TE-enriched waters have been recognized as important processes responsible for TE recycling in Antarctic continental shelf (Corami et al, 2005). Seasonal dynamics of se-ice melting and phytoplankton production are the main factors controlling the element concentration in seawater: as the sea-ice formation sequesters dissolved and particulate nutrients and TEs in winter, the following sea-ice melting, during the austral summer, releases them again in the surface water, fuelling pelagic production (Frache et al, 2001;Grotti et al, 2005;Illuminati et al, 2017). At the same time, packice is a seasonal habitat for many microscopic organisms (hereafter called "sympagic organisms") which represent additional sources of organic matter and TEs for pelagic consumers as soon as ice melts, and also for benthic organisms once settled on the seafloor (Grotti et al, 2005;Morata et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

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Horizontal and vertical food web structure drives trace element trophic transfer in Terra Nova Bay, Antarctica

Signa

Calizza

Costantini

et al. 2019

Environmental Pollution

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Despite in the last decades a vast amount of literature has focused on trace element (TE) contamination in Antarctica, the assessment of the main pathways driving TE transfer to the biota is still an overlooked issue. This limits the ability to predict how variations in sea-ice dynamics and productivity due to climate change will affect TE allocation in food webs. Here, food web structure of Tethys Bay (Terra Nova Bay, Ross Sea, Antarctica) was first characterised using carbon and nitrogen stable isotopes (δ 13 C, δ 15 N) of organic matter sources (sediment and planktonic, benthic and sympagic primary producers) and consumers (zooplankton, benthic invertebrates and vertebrates). Then, relationships between TEs (Cd, Cr, Co, Cu, Hg, Ni, Pb and V) and stable isotopes were assessed in order to evaluate if and how horizontal (organic matter pathways) and vertical (trophic position) food web features influence TE transfer to the biota. Regressions between log[TE] and δ 13 C revealed that the sympagic pathway drives accumulation of V in primary consumers and of Cd and Hg in secondary consumers, and that a coupled benthic/planktonic pathway drives Pb transfer to all consumers. Regressions between log[TE] and δ 15 N showed that only Hg biomagnifies across trophic levels, while all the others TEs showed a biodilution pattern, consistent with patterns observed in temperate food webs. Although the Cd behavior needs further investigations, the present findings provide new insights about the role of basal sources in the transfer of TEs in polar systems, especially important nowadays in light of the forecasted trophic changes potentially resulting from future climate change-induced modification of sea-ice dynamics.Capsule : Depiction of trace element transfer in the Antarctic food web highlighted an important role of both sympagic and phytoplanktonic pathways, suggesting that forecasted modification of sea-ice dynamics due to climate change may alter contaminant accumulation and biomagnification patterns.

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Distribution of Cd, Pb and Cu between dissolved fraction, inorganic particulate and phytoplankton in seawater of Terra Nova Bay (Ross Sea, Antarctica) during austral summer 2011–12

Cited by 22 publications

References 63 publications

Constraining the Global Ocean Cu Cycle With a Data‐Assimilated Diagnostic Model

Constraining the Global Ocean Cu Cycle With a Data‐Assimilated Diagnostic Model

Seasonal Evolution of Size-Segregated Particulate Mercury in the Atmospheric Aerosol Over Terra Nova Bay, Antarctica

Horizontal and vertical food web structure drives trace element trophic transfer in Terra Nova Bay, Antarctica

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