Geochemistry of mercury in surface sediments of the Kuril Basin of the Sea of Okhotsk, Kuril-Kamchatka Trench and adjacent abyssal plain and northwest part of the Bering Sea

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

doi:10.1016/j.dsr2.2017.09.002

Cited by 30 publications

(13 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Maximum concentrations in recent Atacama sediments, which ranged up to 401 ng g −1 (see Fig. S2 ) are the highest reported from remote locations anywhere including in the Kamchatka Trench and abyssal plains (158 ng g −1 16 ) and bathyal areas of the Southern Ocean (87 ng g −1 15 ). They approach the maxima reported from some of the most contaminated shelf sites world-wide including the Bohai Sea, China (574 ng g −1 29 ) and the Laurentian Trough, Canada (520 ng g −1 11 ).…”

Section: Resultsmentioning

confidence: 91%

“…(Plots show mean ± SD values, for the top few cm of sediment cores or surface sediment grab samples. 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 .…”

Section: Resultsmentioning

confidence: 99%

“… 11 – 17 for Hg concentration data on bathyal and abyssal sites; and Refs. 16 , 18 , 19 for hadal sites).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

High mercury accumulation in deep-ocean hadal sediments

Sanei

Outridge

Oguri

et al. 2021

Sci Rep

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

High mercury accumulation in deep-ocean hadal sediments

Sanei

Outridge

Oguri

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Moreover, waters from the Sea of Okhotsk, characterized by a high level of primary production, enter the Pacific Ocean in the region of the Kuril-Kamchatka Trench through numerous straits between the Kuril Islands ( Belyaev, 1989 ; Shuntov, 2001 ). Therefore, the bottom sediments of the Kuril-Kamchatka Trench have high organic matter content ( Belyaev, 1989 ; Itoh et al, 2011 ; Jamieson, 2015 ; Sattarova & Aksentov, 2018 ; Kamenev, 2019 ). This creates favorable conditions for the existence of a large number of species of benthic animals in the hadal zone of the trench, many of which are found in very large numbers at its bottom ( Belyaev, 1989 ).…”

Section: Discussionmentioning

confidence: 99%

Three new deep-sea species of Thyasiridae (Mollusca: Bivalvia) from the abyssal plain of the northwestern Pacific Ocean and hadal depths of the Kuril-Kamchatka Trench

Kamenev¹

2020

PeerJ

View full text Add to dashboard Cite

The Thyasiridae is the most species-rich family of bivalves in the abyssal and hadal zones of the northwestern Pacific Ocean. In recent years, with at least 14 thyasirid species found in that region at depths exceeding 3,000 m. Some of them are the numerically dominant species in bottom communities. However, all members in that family have not yet been identified to the species level. Based on the material collected from 1953 to 2016 by five deep-sea expeditions, three new species of Thyasiridae (Mollusca: Bivalvia) are described from the abyssal and hadal zones of the northwestern Pacific. “Axinulus” roseus sp. nov. was found in the Kuril-Kamchatka Trench at 9,000–9,583 m depth. This species has a large rhomboidal shell with strong commarginal sculpture, a well defined, long and deep lunule and escutcheon without an auricle, a ctenidium consisting of a single demibranch, extensively lobed lateral pouches, and a large prodissoconch with specific sculpture. It is one of the dominant species in terms of abundance in macrobenthic communities in the deepest basin of the Kuril-Kamchatka Trench with a population density of up to 396 ind. m−2. The species has a shell length of up to 9.0 mm and it is the largest thyasirid with a single demibranch. “Axinulus” oliveri sp. nov. was found in a vast region of the northwestern Pacific on the abyssal plain adjacent to the Kuril-Kamchatka Trench, on the abyssal slope of the Kuril Islands, and in the Kuril-Kamchatka Trench at 4,648–6,168 m depth. This species is characterized by its ovate-rhomboidal shell, a well defined, deep and long escutcheon with a distinct auricle, a ctenidium with a single demibranch, and extensively lobed lateral pouches. It is widespread in the northwestern Pacific and forms populations with a density of up to 36 ind. m−2. Scanning electron microscopic observation of the gills of “A.” roseus sp. nov. and “A.” oliveri sp. nov. revealed that these species are not chemosymbiotic. “Axinulus” roseus sp. nov. and “A.” oliveri sp. nov. are provisionally assigned to the genus Axinulus, because they differ from the type species of the genus in a number of morphological and anatomical features. Parathyasira fragilis sp. nov. was found on the abyssal plain adjacent to the Kuril-Kamchatka Trench at 5,249–5,399 m depth. This species is distinguished by its very thin, fragile, dorsoventrally elongated, rhomboidal shell with very long anterodorsal margin and a long, wide, flat lunule. The taxonomic position of the new species is discussed.

show abstract

“…The mixture of the geochemical components located at various depths of the continental slope and trench implies that sediments from upper to lower slope has been incorporated into a single bed (Völker et al, 2008). Other examples of the geochemical complex circulation, system of deposition and transport given by various studies (e.g., Sattarova & Aksentov, 2018;Lehu et al, 2015).…”

Section: Fig 3 Geoid Modelling Of the Study Areamentioning

confidence: 99%

Generic Mapping Tools and Matplotlib Package of Python for Geospatial Data Analysis in Marine Geology

Lemenkova

2019

International Journal of Environment and Geoinformatics

View full text Add to dashboard Cite

Understanding patterns of the correlation between the geomorphology and geology of the seafloor of the hadal trenches is important for the proper ocean modelling. Current paper focuses on the west Pacific Ocean region with a special case of Mariana Trench, the deepest hadal trench on the planet. Methodology of the research include combination of Generic Mapping Tools (GMT) and Quantum GIS based mapping of the geographic location, bathymetry, geodesy, sediment thickness, geomorphic shape, tectonic and geologic structure of the Mariana Trench area, and statistical analysis by means of Python. A GMT was selected for GIS visualization due to its powerful functionality and effective cartographic solutions. An object-oriented high-level programming language, Python was chosen for the data analysis and scientific plotting. The statistical analysis includes following steps: 1) Data distribution by the box plots; 2) Data sorting and grouping by stem plots; 3) Correlation analysis by 3D comparative plots referred to four tectonic plates; 4) Principal Component Analysis; 5) Analysis of Variance. The statistical analysis of the data set was performed in Matplotlib library and its dependencies: NumPy, SciPy and Pandas. A combination of the powerful methods by GMT with data analysis supported by Python programming language is an important method in geosciences aimed to increase the effectiveness of the data analysis by cartographic mapping, statistical computations and graph plotting. This paper illustrated usage of GMT, QGIS and Python for combined data analysis scheme. The results demonstrated correlation between the sediment thickness, slope steepness, depths and location of the bathymetric profiles crossing adjacent tectonic plates: Philippine, Pacific, Caroline and Mariana.

show abstract

Geochemistry of mercury in surface sediments of the Kuril Basin of the Sea of Okhotsk, Kuril-Kamchatka Trench and adjacent abyssal plain and northwest part of the Bering Sea

Cited by 30 publications

References 33 publications

High mercury accumulation in deep-ocean hadal sediments

High mercury accumulation in deep-ocean hadal sediments

Three new deep-sea species of Thyasiridae (Mollusca: Bivalvia) from the abyssal plain of the northwestern Pacific Ocean and hadal depths of the Kuril-Kamchatka Trench

Generic Mapping Tools and Matplotlib Package of Python for Geospatial Data Analysis in Marine Geology

Contact Info

Product

Resources

About