Lead isotope exchange between dissolved and fluvial particulate matter: a laboratory study from the Johor River estuary

Chen, Mengli; Boyle, Edward A.; Lee, Jong-Mi; Nurhati, Intan Suci; Zurbrick, Cheryl M.; Switzer, Adam D.; Carrasco, Gonzalo

doi:10.1098/rsta.2016.0054

Cited by 22 publications

(28 citation statements)

References 62 publications

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“…The pattern of large enrichments of some metals (V, Cr, Ni, Cu, Zn and Pb) and small enrichments of others (Mn, Fe and also other elements including Ba, U, Th and rare earth elements) is seen in many datasets [12,13,15,38,67] and has persisted for many years, with similar values and patterns evident in data from the 1970s [64]. Lead, for which there has been a significant change owing to elimination of lead additions to automobile fuels [68], is an exception to this. The magnitude of enrichments is reduced in very dusty air masses such those from the Sahara, owing to the anthropogenic component being diluted by the dust component, as is evident from comparing enrichments in air arriving at Cape Verde from the north after passage over the North Atlantic for several days (table 5 and [13]) to the average of all air masses arriving at Cape Verde which therefore include air masses strongly influenced by Saharan dust [12].…”

Section: Atmospheric Deposition Of Other Trace Elementsmentioning

confidence: 99%

Atmospheric transport of trace elements and nutrients to the oceans

Jickells¹,

Baker²,

Chance³

2016

Phil. Trans. R. Soc. A.

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This paper reviews atmospheric inputs of trace elements and nutrients to the oceans in the context of the GEOTRACES programme and provides new data from two Atlantic GEOTRACES cruises. We consider the deposition of nitrogen to the oceans, which is now dominated by anthropogenic emissions, the deposition of mineral dust and related trace elements, and the deposition of other trace elements which have a mixture of anthropogenic and dust sources. We then consider the solubility (as a surrogate for bioavailability) of the various elements. We consider briefly the sources, atmospheric transport and transformations of these elements and how this results in strong spatial deposition gradients. Solubility of the trace elements also varies systematically between elements, reflecting their sources and cycling, and for some trace elements there are also systematic gradients in solubility related to dust loading. Together, these effects create strong spatial gradients in the inputs of bioavailable trace elements to the oceans, and we are only just beginning to understand how these affect ocean biogeochemistry.This article is part of the themed issue 'Biological and climatic impacts of ocean trace element chemistry'.

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Section: Atmospheric Deposition Of Other Trace Elementsmentioning

confidence: 99%

Atmospheric transport of trace elements and nutrients to the oceans

Jickells¹,

Baker²,

Chance³

2016

Phil. Trans. R. Soc. A.

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“…By this, we mean that in the open ocean with relatively low particulate concentrations and minimal sediment interactions we expect Pb to behave in a quasi-conservative manner over short mixing timescales. Although other work has demonstrated that isotopic exchange with particles can influence the dissolved Pb isotope composition (Wu et al, 2010;Chen et al, 2016), this occurs over much longer timescales than the mixing of Norwegian Sea water and LSW to form ISOW. Using our Pb data for Station 32 and the eOMP analysis that the deepest samples are 100 % ISOW and ∼ 20 % LSW (García-Ibáñez et al, 2017), we back-calculate a Norwegian Sea water that is ∼ 7 pmol kg −1 and 206 Pb / 207 Pb ∼ 1.180.…”

Section: Iceland Basin (S32-s36) and Reykjanes Ridge (S38)mentioning

confidence: 99%

Dissolved Pb and Pb isotopes in the North Atlantic from the GEOVIDE transect (GEOTRACES GA-01) and their decadal evolution

et al. 2018

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Abstract. During the 2014 GEOVIDE transect, seawater samples were collected for dissolved Pb and Pb isotope analysis. These samples provide a high-resolution "snapshot" of the source regions for the present Pb distribution in the North Atlantic Ocean. Some of these stations were previously occupied for Pb from as early as 1981, and we compare the 2014 data with these older data, some of which are reported here for the first time. Lead concentrations were highest in subsurface Mediterranean Water (MW) near the coast of Portugal, which agrees well with other recent observations by the US GEOTRACES program (Noble et al., 2015). The recently formed Labrador Sea Water (LSW) between Greenland and Nova Scotia is much lower in Pb concentration than the older LSW found in the West European Basin due to decreases in Pb emissions into the atmosphere during the past 20 years. Comparison of North Atlantic data from 1989 to 2014 shows decreasing Pb concentrations consistent with decreased anthropogenic inputs, active scavenging, and advection/convection. Although the isotopic composition of northern North Atlantic seawater appears more homogenous compared to previous decades, a clear spatiotemporal trend in isotope ratios is evident over the past 15 years and implies that small changes to atmospheric Pb emissions continue. Emissions data indicate that the relative proportions of US and European Pb sources to the ocean have been relatively uniform during the past 2 decades, while aerosol data may suggest a greater relative proportion of natural mineral Pb. Using our measurements in conjunction with emissions inventories, we support the findings of previous atmospheric analyses that a significant portion of the Pb deposited to the ocean in 2014 was natural, although it is obscured by the much greater solubility of anthropogenic aerosols over natural ones.

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“…24 National and international research programs such as GEOTRACES (www.geotraces.org) have been rapidly expanding our knowledge about the temporal and spatial distributions of Pb, and other trace elements, along with the internal cycling and equilibrium exchange of Pb between dissolved, colloidal, and particulate phases. 25,26 Recent studies report the distributions of Pb in the northwest Pacific Ocean, 27 eastern tropical Atlantic Ocean, 24 North Atlantic Ocean, 19 and the North Subarctic Atlantic including the Iceland Basin and the Irminger and Labrador Seas. 23 Nonetheless, the geochemistry of Pb in other regions, such as the Arctic Ocean, is still poorly characterized.…”

Section: ■ Introductionmentioning

confidence: 99%

Tracing Dissolved Lead Sources in the Canadian Arctic: Insights from the Canadian GEOTRACES Program

Colombo

Rogalla

Myers

et al. 2019

ACS Earth Space Chem.

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This study addresses an important knowledge gap in the distribution of lead (Pb) in the Arctic Ocean, by presenting dissolved Pb concentrations from samples collected during the GEOTRACES Canadian cruise in 2015. Dissolved Pb showed an increase in concentration from the Canada Basin toward Baffin Bay and the Labrador Sea. Canada Basin was the most isolated region from anthropogenic Pb inputs with low background concentrations (1.4−6.2 pmol kg −1 ) across most of the basin, although higher Pb features from the advection of Pacific-derived waters and sea ice meltwater were present. Likewise, high-Pb peaks (13.5−26.6 pmol kg −1 ) along narrow isopycnal surfaces (σ θ , 27.4−27.6) in Baffin Bay were attributed to the advection of North Atlantic waters spreading a high-Pb signature into the bay, contrasting with the low values (2.5−7.4 pmol kg −1 ) present in the mixed layer, Arctic and Baffin Bay deep waters. The Labrador Sea, largely influenced by the recirculation of North Atlantic waters, had the highest Pb concentrations (∼17−34 pmol kg −1 ) measured in this study. The Canadian Arctic Archipelago (CAA) represents a transition environment influenced by Arctic waters imprinting a low-Pb signature in the western CAA and the southern side of Parry Channel, while Baffin Bay waters prevailed in the eastern CAA recirculating westward along the northern side of Parry Channel and progressively losing their relatively high Pb signature. Extremely low concentrations were measured in Canada Basin and CAA waters, which reflect the remoteness of this region from anthropogenic inputs as well as the old ventilation age of deep waters' masses, providing a baseline for assessing future Pb studies. Finally, we successfully integrate modeling data with field observations demonstrating that dissolved lead, due to its distinctive anthropogenic signature in North Atlantic waters, can be a useful complementary tracer of water masses in the Canadian Arctic Ocean.

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Lead isotope exchange between dissolved and fluvial particulate matter: a laboratory study from the Johor River estuary

Abstract: One contribution of 20 to a discussion meeting issue 'Biological and climatic impacts of ocean trace element chemistry'.

Cited by 22 publications

References 62 publications

Atmospheric transport of trace elements and nutrients to the oceans

Atmospheric transport of trace elements and nutrients to the oceans

Dissolved Pb and Pb isotopes in the North Atlantic from the GEOVIDE transect (GEOTRACES GA-01) and their decadal evolution

Tracing Dissolved Lead Sources in the Canadian Arctic: Insights from the Canadian GEOTRACES Program

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