On the elemental composition of suspended matter of the Severnaya Dvina River (White Sea region)

Шевченко, В. П.; Pokrovsky, Oleg S.; Филиппов, А. С.; Lisitsyn, A. P.; Bobrov, V. A.; Bogunov, A Yu; Zavernina, N N; Zolotykh, E. O.; Isaeva, Alexandra B; Kokryatskaya, N. M.; Korobov, V. B.; Кравчишина, М. Д.; Novigatsky, А. N.; Politova, N. V.

doi:10.1134/s1028334x10020182

Cited by 37 publications

(12 citation statements)

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“…The average total REE concen tration in the studied samples varies from 26-37 ppm (areas from the Severnaya Dvina River upstream and downstream of the Pinega River mouth and lower reaches of the Pinega River) to 66-96 (Severnaya Dvina delta and Dvina Bay) and ~130 ppm (the boundary between Dvina Bay and basin and Terskii coast). This is slightly lower than the value given for the Severnaya Dvina River suspension [11], but the total character of REE distribution in these samples of bottom sediments and the Severnaya Dvina River sus pension does not differ.…”

contrasting

confidence: 57%

Systematics of Th, Cr, Hf, Co, and rare-earth elements in modern bottom sediments of the white sea and lower reaches of the Severnaya Dvina River

et al. 2012

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contrasting

confidence: 57%

Systematics of Th, Cr, Hf, Co, and rare-earth elements in modern bottom sediments of the white sea and lower reaches of the Severnaya Dvina River

et al. 2012

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“…Fast degradation of plant litter in water (Aerts & Chapin, ; Fraysse, Pokrovsky, & Meunier, ) may provide a significant and highly labile pool for OC and a number of major (Ca, Si, and K) and trace elements, especially during the spring flood period. Furthermore, the maximal concentration of river suspended matter (RSM) always occurs during the spring flood as demonstrated by other boreal rivers (McClelland et al, ; Pokrovsky et al, ; Shevchenko et al, ). The latter period of the year lasts less than 2 months (end of April to June) but provides more than 50% of overall export of the soluble components from the watershed.…”

Section: Introductionmentioning

confidence: 93%

Biogeochemistry of dissolved carbon, major, and trace elements during spring flood periods on the Ob River

Vorobyev

Pokrovsky

Kolesnichenko

et al. 2019

Hydrological Processes

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Detailed knowledge of the flood period of Arctic rivers remains one of the few factors impeding rigorous prediction of the effect of climate change on carbon and related element fluxes from the land to the Arctic Ocean. In order to test the temporal and spatial variability of element concentration in the Ob River (western Siberia) water during flood period and to quantify the contribution of spring flood period to the annual element export, we sampled the main channel year round in 2014-2017 for dissolved C, major, and trace element concentrations. We revealed high stability (approximately ≤10% relative variation) of dissolved C, major, and trace element concentrations in the Ob River during spring flood period over a 1-km section of the river channel and over 3 days continuous monitoring (3-hr frequency). We identified two groups of elements with contrasting relationship to discharge: (a) DIC and soluble elements (Cl, SO 4 , Li, B, Na, Mg, Ca, P, V, Cr, Mn, As, Rb, Sr, Mo, Ba, W, and U) negatively correlated (p < 0.05) with discharge and exhibited minimal concentrations during spring flood and autumn high flow and (b) DOC and particle-reactive elements (Al, Fe, Ti, Y, Zr, Nb, Cs, REEs, Hf, Tl, Pb, and Th), some nutrients (K), and metalloids (Ge, Sb, and Te), positively correlated (p < 0.05) with discharge and showed the highest concentrations during spring flood. We attribute the decreased concentration of soluble elements with discharge to dilution by groundwater feeding and increased concentration of DOC and particle-reactive metals with discharge to leaching from surface soil, plant litter, and suspended particles. Overall, the present study provides first-order assessment of fluxes of major and trace elements in the middle course of the Ob River, reveals their high temporal and spatial stability, and characterizes the mechanism of river water chemical composition acquisition.

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“…The field work was performed during several hydrological seasons: winter baseflow in March 2009, summer baseflow in July 2010 and 2012 and the start of ice formation/beginning of winter baseflow in November-December 2011 while the water was still free of ice. Detailed geological, climatic and geographic descriptions of the region are presented elsewhere (Shevchenko et al, 2004(Shevchenko et al, , 2010Pokrovsky et al, 2010;Koukina et al, 2001). Sampling was performed from the surface (0.5 m) horizon using a horizontal water sampler made of polycarbonate/PVC (Aquatic Research Co) hung with nylon cord from the PVC motor boat (July) or from the ice (March).…”

Section: Sampling and Analysesmentioning

confidence: 99%

Fate of colloids during estuarine mixing in the Arctic

et al. 2014

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Abstract. The estuarine behavior of organic carbon (OC) and trace elements (TE) was studied for the largest European sub-Arctic river, which is the Severnaya Dvina; this river has a deltaic estuary covered in ice during several hydrological seasons: summer (July 2010, 2012) and winter (March 2009) baseflow, and the November–December 2011 ice-free period. Colloidal forms of OC and TE were assessed for three pore size cutoffs (1, 10, and 50 kDa) using an in situ dialysis procedure. Conventionally dissolved (< 0.22 μm) fractions demonstrated clear conservative behavior for Li, B, Na, Mg, K, Ca, Sr, Mo, Rb, Cs, and U during the mixing of freshwater with the White Sea; a significant (up to a factor of 10) concentration increase occurs with increases in salinity. Si and OC also displayed conservative behavior but with a pronounced decrease in concentration seawards. Rather conservative behavior, but with much smaller changes in concentration (variation within ±30%) over a full range of salinities, was observed for Ti, Ni, Cr, As, Co, Cu, Ga, Y, and heavy REE. Strong non-conservative behavior with coagulation/removal at low salinities (< 5‰) was exhibited by Fe, Al, Zr, Hf, and light REE. Finally, certain divalent metals exhibited non-conservative behavior with a concentration gain at low (~ 2–5‰, Ba, Mn) or intermediate (~ 10–15‰, Ba, Zn, Pb, Cd) salinities, which is most likely linked to TE desorption from suspended matter or sediment outflux. The most important result of this study is the elucidation of the behavior of the "truly" dissolved low molecular weight LMW< 1 kDa fraction containing Fe, OC, and a number of insoluble elements. The concentration of the LMW fraction either remains constant or increases its relative contribution to the overall dissolved (< 0.22 μm) pool as the salinity increases. Similarly, the relative proportion of colloidal (1 kDa–0.22 μm) pool for the OC and insoluble TE bound to ferric colloids systematically decreased seaward, with the largest decrease occurring at low (< 5‰) salinities. Overall, the observed decrease in the colloidal fraction may be related to the coagulation of organo-ferric colloids at the beginning of the mixing zone and therefore the replacement of the HMW1 kDa–0.22 μm portion by the LMW< 1 kDa fraction. These patterns are highly reproducible across different sampling seasons, suggesting significant enrichment of the mixing zone by the most labile (and potentially bioavailable) fraction of the OC, Fe and insoluble TE. The size fractionation of the colloidal material during estuarine mixing reflects a number of inorganic and biological processes, the relative contribution of which to element speciation varies depending on the hydrological stage and time of year. In particular, LMW< 1 kDa ligand production in the surface horizons of the mixing zone may be linked to heterotrophic mineralization of allochthonous DOM and/or photodestruction. Given the relatively low concentration of particulate versus dissolved load of most trace elements, desorption from the river suspended material was less pronounced than in other rivers in the world. As a result, the majority of dissolved components exhibited either conservative (OC and related elements such as divalent metals) or non-conservative, coagulation-controlled (Fe, Al, and insoluble TE associated with organo-ferric colloids) behavior. The climate warming at high latitudes is likely to intensify the production of LMW< 1 kDa organic ligands and the associated TE; therefore, the delivery of potentially bioavailable trace metal micronutrients from the land to the ocean may increase.

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On the elemental composition of suspended matter of the Severnaya Dvina River (White Sea region)

Cited by 37 publications

References 7 publications

Systematics of Th, Cr, Hf, Co, and rare-earth elements in modern bottom sediments of the white sea and lower reaches of the Severnaya Dvina River

Systematics of Th, Cr, Hf, Co, and rare-earth elements in modern bottom sediments of the white sea and lower reaches of the Severnaya Dvina River

Biogeochemistry of dissolved carbon, major, and trace elements during spring flood periods on the Ob River

Fate of colloids during estuarine mixing in the Arctic

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