Export of organic carbon, nutrients and metals by the mid-sized Pechora River to the Arctic Ocean

Chupakov, Artem V.; Pokrovsky, Oleg S.; Moreva, Olga Y.; Котова, Е. И.; Vorobyeva, Taissia Y.; Shirokova, Liudmila S.

doi:10.1016/j.chemgeo.2023.121524

Cited by 10 publications

(5 citation statements)

References 87 publications

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“…The objective of this work is to systematize and generalize the results of these studies [7][8][9][10] (including the unpublished data from A.V. Savenko) in conjunction with data from other literature sources [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] and to estimate the mean concentrations of dissolved trace elements in the river runoff from the White, Pechora, Kara, Laptev, and East Siberian sea watersheds.…”

Section: Introductionmentioning

confidence: 99%

Trace Element Composition of the Dissolved Matter Runoff of the Russian Arctic Rivers

Savenko,

Savenko

2024

Water

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Data on the content of dissolved trace elements (P, Si, Li, Rb, Cs, Be, Sr, Ba, Mn, Fe, Co, Ni, Cu, Zn, Cd, Tl, Pb, Al, Ga, Y, Ti, Zr, Hf, Th, U, rare earth elements, F, B, Ge, V, As, Sb, Cr, Se, Mo, and W) in the river runoff from the Russian Arctic sea watersheds were systematized and generalized. There is a tendency for the decrease in the trace element concentrations in the direction from west to east for the considered Arctic watersheds (the White, Pechora, Kara, Laptev, and East Siberian seas). It was shown that the concentrations of dissolved trace elements in the river runoff from the Russian Arctic sea watersheds are in general consistent with modern estimates of the average composition of the global river runoff.

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Section: Introductionmentioning

confidence: 99%

Trace Element Composition of the Dissolved Matter Runoff of the Russian Arctic Rivers

Savenko,

Savenko

2024

Water

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“…Calculations of pairwise correlation coefficients reveal significant relationships between these carriers and TE for each river. A comparison of element yields for the four Arctic rivers measured in this study with those available from recent high temporal resolution campaigns on the Severnaya Dvina, Pechora, and Taz [39,40,42] demonstrates general similarity, by the order of magnitude, for most major and minor solutes. The Ob River's fluxes are close to those of Taz, given a similarity in climatic, landscape, and lithological background, whereas Yenisey and Lena can be reasonably approximated by the fluxes measured in Severnaya Dvina and Pechora since the latter two have a combination of crystalline silicate and sedimentary (including carbonate) rocks on their watersheds.…”

Section: Correlation Dependencies Between Major and Trace Elements An...mentioning

confidence: 55%

“…Reliable data were obtained for dischargeweighted concentrations of more than 50 elements in water and suspended matter and their fluxes based on sampling during 3-5 years at least once a month ( [36][37][38][39] and references in these papers). High-frequency data have also been published recently for rivers of the Barents Sea basin such as Pechora [40]. A sizable amount of new information has become available for the largest Arctic rivers, Ob and Yenisey, and the catchments of Pur and Taz Rivers as well [41][42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Dissolved Major and Trace Elements in the Largest Eurasian Arctic Rivers: Ob, Yenisey, Lena, and Kolyma

Gordeev,

Pokrovsky,

Zhulidov

et al. 2024

Water

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In contrast to fairly good knowledge of dissolved carbon and major elements in great Arctic rivers, seasonally resolved concentrations of many trace elements remain poorly characterized, hindering assessment of the current status and possible future changes in the hydrochemistry of the Eurasian Arctic. To fill this gap, here we present results for a broad suite of trace elements in the largest rivers of the Russian Arctic (Ob, Yenisey, Lena, and Kolyma). For context, we also present results for major elements that are more routinely measured in these rivers. Water samples for this study were collected during an international campaign called PARTNERS from 2004 through 2006. A comparison of element concentrations obtained for Arctic rivers in this study with average concentrations in the world’s rivers shows that most elements in the Arctic rivers are similar to or significantly lower than the world average. The mineral content of the three greatest rivers (Ob, Yenisey, and Lena) varies within a narrow range (from 107 mg/L for Yenisey to 123 mg/L for Ob). The Kolyma’s mineral content is significantly lower (52.4 mg/L). Fluxes of all major and trace elements were calculated using average concentrations and average water discharge for the 2004–2006 period. Based on these flux estimates, specific export (i.e., t/km2/y) for most of the elements was greatest for the Lena, followed by the Yenisey, Ob, and Kolyma in decreasing order. Element pairwise correlation analysis identified several distinct groups of elements depending on their sources and relative mobility in the river water. There was a negative correlation between Fe and DOC concentration in the Ob River, which could be linked to different sources of these components in this river. The annual yields of major and trace elements calculated for each river were generally consistent with values assessed for other mid-size and small rivers of the Eurasian subarctic.

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“…Studies completed to date suggest that permafrost thaw enhances (bio)geochemical cycling of geochemically diverse metal(loid)s such as Fe, − Se, Hg, , and U . Despite their geochemically distinct properties, mobilization of these metal(loid)s during permafrost thaw is influenced by similar events including: (i) thaw and transport of porewater, (ii) metal–organic C chelation, ,, and (iii) changes in groundwater redox conditions driven by organic C biodegradation. , Understanding of the implications of permafrost thaw on metal(loid) mobility is predicated on understanding their speciation and geochemistry in permafrost regions, which is currently available from only a few studies examining a handful of metal(loid)s. − ,, …”

Section: Introductionmentioning

confidence: 99%

Arsenic Mobilization from Thawing Permafrost

Skierszkan,

Schoepfer,

Fellwock

et al. 2024

ACS Earth Space Chem.

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Thawing permafrost releases labile organic carbon and alters groundwater geochemistry and hydrology with uncertain outcomes for the mobility of hazardous metal(loid)s. Managing water quality in thawing permafrost regions is predicated on a detailed understanding of the speciation and abundance of metal(loid)s in permafrost soils and porewaters produced during thaw, which remains limited at present. This study contributes new knowledge on the sources and fate of arsenic during the thaw of organic-rich permafrost using samples collected from a subarctic permafrost region associated with geogenic arsenic (Dawson Range, Yukon, Canada). Several permafrost cores and active-layer samples from this region were analyzed for their solid-phase and aqueous geochemical characteristics and their arsenic speciation. Porewaters were extracted from permafrost cores after thaw under anaerobic conditions for aqueous geochemical analyses. Bedrock samples from the field site were also analyzed for arsenic speciation and mineralogy. X-ray diffraction and X-ray near-edge spectroscopy (XANES) analyses of weathered bedrock upgradient of soil sampling locations contained arsenic(V) hosted in iron-(oxyhydr)oxides and scorodite. XANES and micro X-ray fluorescence analyses of permafrost soils indicated a mixture of arsenic(III) and arsenic(V), indicating redox recycling of arsenic. Soil-bound arsenic was colocated with iron, likely as arseniferous iron-(oxyhydr)oxides that have been encapsulated by aggrading permafrost over geologic time. However, permafrost thaw produced porewater containing elevated dissolved arsenic (median 40 μg L −1 , range 2−96 μg L −1 ). Thawed permafrost porewater also contained elevated dissolved iron (median 5.5 mg L −1 , range 0.5−40 mg L −1 ) and dissolved organic carbon (median 423 mg L −1 , range 72−3240 mg L −1 ), indicative of reducing conditions. This study highlights that arsenic can be found in reactive forms in permafrost soil, and that its thaw can release arsenic and iron to porewater and produce poor water quality.

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Export of organic carbon, nutrients and metals by the mid-sized Pechora River to the Arctic Ocean

Cited by 10 publications

References 87 publications

Trace Element Composition of the Dissolved Matter Runoff of the Russian Arctic Rivers

Trace Element Composition of the Dissolved Matter Runoff of the Russian Arctic Rivers

Dissolved Major and Trace Elements in the Largest Eurasian Arctic Rivers: Ob, Yenisey, Lena, and Kolyma

Arsenic Mobilization from Thawing Permafrost

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