Mercury geochemistry of deep-sea sediment cores from the Kuril area, northwest Pacific

Аксентов, К. И.; Sattarova, Valentina V.

doi:10.1016/j.pocean.2019.102235

Cited by 21 publications

(14 citation statements)

References 42 publications

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“…Hg in these sediments was assumed to be a result of Hg binding by phytoplankton depositing Hg-bearing organic matter in the photic zone. A similar conclusion was reached by Aksentov and Sattarova (2020), who used a thermoscanning technique to detect Hg forms. They found that biological productivity controlled the Hg burial in northwestern Pacific bottom sediments and that the forms of Hg depended on the diatom content.…”

Section: Introductionsupporting

confidence: 72%

“…Seasonal blooms in the surface waters will also cause temporally variable fluxes of elements in the deep ocean (Fowler and Knauer, 1986;Michel et al, 2002;Pilskaln et al, 2004). For Hg, these findings are supported by water column (Lamborg et al, 2014b) and marine sediment measurements (Kita et al, 2013;Aksentov and Sattarova, 2020). Lamborg et al (2014b) described a nutrientlike distribution of Hg in the water column of oceans.…”

Section: Introductionmentioning

confidence: 74%

“…In the global biogeochemical cycle of Hg, the ocean, as the dominant physical feature of our planet Earth, is of specific concern. A substantial amount of Hg (∼ 80 %) which is emitted to the atmosphere from natural and anthropogenic sources reaches the ocean (Horowitz et al, 2017;Schartup et al, 2019), and ocean sediments are considered to be the ultimate sink of Hg on a timescale of tens of thousands of years (Fitzgerald et al, 2007;Selin, 2009;Amos et al, 2013). Despite the important role of marine sedimentation in the global Hg biogeochemical cycle, little is known about the rates or amount of Hg accumulation in marine sediments, especially in the open ocean.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the important role of marine sedimentation in the global Hg biogeochemical cycle, little is known about the rates or amount of Hg accumulation in marine sediments, especially in the open ocean. In contrast to the well-studied Hg cycling in terrestrial environments, knowledge about the temporal and spatial distribution of Hg in the marine environment is limited to model estimations (Mason and Sheu, 2002;Sunderland and Mason, 2007), water column measurements (Cossa et al, 2011;Lamborg et al, 2014b;Canário et al, 2017), and very few sediment measurements (Kita et al, 2013;Aksentov and Sattarova, 2020). A main reason for our limited understanding of the fate of Hg in the oceans is the lack of high-resolution marine sedimentary records, especially from the deep ocean (Zaferani et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Biogeochemical processes accounting for the natural mercury variations in the Southern Ocean diatom ooze sediments

Zaferani

Biester

2020

Ocean Sci.

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Abstract. Due to its toxic nature and its high potential for biomagnification, mercury is a pollutant of concern. Understanding the marine biogeochemical cycle of mercury is crucial as consumption of mercury-enriched marine fish is the most important pathway of human exposure to monomethylmercury, a neurotoxin. However, due to the lack of long-term marine records, the role of the oceans in the global mercury cycle is poorly understood. We do not have well-documented data of natural mercury accumulations during changing environmental conditions, e.g., sea surface conditions in the ocean. To understand the influence of different sea surface conditions (climate-induced changes in ice coverage and biological production) on natural mercury accumulation, we used a continuous ∼170 m Holocene biogenic sedimentary record from Adélie Basin, East Antarctica, which mainly consists of silica-based skeletons of diatoms. We performed principal component analysis and regression analysis on element concentrations and corresponding residuals, respectively, to investigate the link between sediment mercury accumulation, terrestrial inputs, and phytoplankton productivity. Preindustrial mercury in the remote marine basin shows extremely high accumulation rates (median: 556 µg m−2 yr−1) that displayed periodic-like variations. Our analyses show that the variations in total mercury concentrations and accumulation rates are associated with biological production and related scavenging of water-phase mercury by rapidly sinking algae or algae-derived organic matter after intense algae blooms. High accumulation rates of other major and trace elements further reveal that, in regions of high primary productivity, settling of biogenic materials removes a large fraction of dissolved or particulate-bound elements from the free water phase through scavenging or biological uptake. The link between mercury cycling and primary production will need to be considered in future studies of the marine mercury cycle under primary production enhancement through climatic, temperature, and nutrient availability changes.

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Section: Introductionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Biogeochemical processes accounting for the natural mercury variations in the Southern Ocean diatom ooze sediments

Zaferani

Biester

2020

Ocean Sci.

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“…Study locations and Hg data sources in panel ( A ): 1—Marianna/Yap Trenches 18 , 2—Marianna Trench 19 , 3—Kermadec Trench and abyssal plain (this study), 4—New Britain Trench 19 , 5—Kuril-Kamchatka Trench and abyssal plain 16 , 6—Atacama Trench and abyssal plain and slope (this study). In panel ( B ), the locations and sources for data points 3 and 6 are the same as in panel A, but for point 5 the flux is from one core on the Kuril Basin abyssal plain 17 . Linear regression equations are shown as dashed lines, and in ( B ) the regression was forced through the origin.…”

Section: Resultsmentioning

confidence: 99%

High mercury accumulation in deep-ocean hadal sediments

Sanei

Outridge

Oguri

et al. 2021

Sci Rep

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Ocean sediments are the largest sink for mercury (Hg) sequestration and hence an important part of the global Hg cycle1. Yet accepted global average Hg flux data for deep-ocean sediments (> 200 m depth) are not based on measurements on sediments but are inferred from sinking particulates2. Mercury fluxes have never been reported from the deepest zone, the hadal (> 6 km depth). Here we report the first measurements of Hg fluxes from two hadal trenches (Atacama and Kermadec) and adjacent abyssal areas (2–6 km). Mercury concentrations of up to 400 ng g−1 were the highest recorded in marine sediments remote from anthropogenic or hydrothermal sources. The two trench systems differed significantly in Hg concentrations and fluxes, but hadal and abyssal areas within each system did not. The relatively low recent mean flux at Kermadec was 6–15 times higher than the inferred deep-ocean average1,3, while the median flux across all cores was 22–56 times higher. Thus, some hadal and abyssal sediments are Hg accumulation hot-spots. The hadal zone comprises only ~ 1% of the deep-ocean area, yet a preliminary estimate based on sediment Hg and particulate organic carbon (POC) fluxes suggests total hadal Hg accumulation may be 12–30% of the estimate for the entire deep-ocean. The few abyssal data show equally high Hg fluxes near trench systems. These results highlight a need for further research into deep-ocean Hg fluxes to better constrain global Hg models.

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Mercury and stable nitrogen isotope ratios in the hair of bearded seals (Erignathus barbatus nauticus) from the Sea of Okhotsk

Trukhin,

Kalinchuk,

Rumiantseva

et al. 2024

Environ Sci Pollut Res

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Mercury geochemistry of deep-sea sediment cores from the Kuril area, northwest Pacific

Cited by 21 publications

References 42 publications

Biogeochemical processes accounting for the natural mercury variations in the Southern Ocean diatom ooze sediments

Biogeochemical processes accounting for the natural mercury variations in the Southern Ocean diatom ooze sediments

High mercury accumulation in deep-ocean hadal sediments

Mercury and stable nitrogen isotope ratios in the hair of bearded seals (Erignathus barbatus nauticus) from the Sea of Okhotsk

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