Measuring and Estimating Fluxes of Carbon, Major and Trace Elements to the Arctic Ocean

Pokrovsky, Oleg S.

doi:10.1007/978-3-319-24409-9_6

Cited by 2 publications

(2 citation statements)

References 71 publications

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“…This increase is likely due to increased inflow of manganese-rich groundwater resulting from permafrost thawing. Thawing ground ice augments the influx of dissolved substances and serves as a significant source for their introduction into the Ob River water, alongside mineral weathering and plant li er decomposition [59].…”

Section: Discussionmentioning

confidence: 99%

Climate Change and the Ob River: A Reassessment of Major and Trace Element Fluxes to the Arctic Ocean

Moskovchenko,

Soromotin,

Khoroshavin

et al. 2024

Preprint

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This study investigated the content of macro- and microelements in the lower reaches of the Ob River (Western Siberia). Seasonal sampling was performed over a four-year period (2020-2023) during the main hydrological seasons (winter low water, spring-summer floods, and early fall low water) at three river stations. Suspended and dissolved fractions were separated by filtration through 0.45-micron nitrocellulose filters. The results revealed significant seasonal variations in the elemental content of the Ob River water, associated with changes in catchment inputs, physical and chemical conditions of the aquatic environment, and the amount and composition of incoming suspended sediment. During high water flow events in the Ob River, the concentration of suspended solids increased substantially. These included significant quantities of sparingly soluble hydrolysates such as Al, Ti, Zr, Ga. During the winter period when the Ob River was ice-covered, a 2- to 3-fold rise was observed in the concentration of Na, Mg, Ca, K, Si, Mn. Having accounted for these seasonal variations in water chemistry, we were able to refine our estimates of elemental export to the Arctic Ocean. Compared to estimates from previous studies, we observed with 2.3-fold higher dissolved loads of Mn, 2.1-fold for Zn, 1.6-fold for Fe, and 1.4-fold for Pb.

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Section: Discussionmentioning

confidence: 99%

Climate Change and the Ob River: A Reassessment of Major and Trace Element Fluxes to the Arctic Ocean

Moskovchenko,

Soromotin,

Khoroshavin

et al. 2024

Preprint

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“…Spring thaw and late‐summer rain events (referred as peak events in the following) are two key periods for lateral transport of soil constituents to Arctic rivers (Beel et al., 2021). According to the pulse‐shunt model (Raymond et al., 2016), the spring snowmelt and summer rain events are the periods when DOC can be flushed directly from soils into Arctic rivers (Finlay et al., 2006; Koch et al., 2013; Kutscher et al., 2017; Mann et al., 2012; Raymond et al., 2007; Rember & Trefry, 2004; Spencer et al., 2009; Wickland et al., 2012) accompanied by high riverine concentrations of mineral elements (Bagard et al., 2011; Krickov et al., 2019; Pokrovsky, 2016; Pokrovsky et al., 2010; Vorobyev et al., 2019). However, what is not known is how the changes in soil hydrology in response to permafrost degradation will modulate the transfer of mineral element‐bound DOC during peak events at the soil‐river interface.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Changes in Hydrology and Permafrost Degradation Control Mineral Element‐Bound DOC Transport From Permafrost Soils to Streams

Hirst

Mauclet

Monhonval

et al. 2022

Global Biogeochemical Cycles

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Mineral elements bind to dissolved organic carbon (DOC) in permafrost soils, and this may contribute to the stabilization or the degradation of organic carbon along the soil to river continuum. Permafrost thaw enlarges the pool of soil constituents available for soil to river transfer. The unknown is how changes in hydrology upon permafrost degradation affect the connection between soil‐derived mineral element‐bound DOC and headwater streams. Here, we study Al, Fe, Ca, and DOC concentrations in water from a headwater stream at Eight Mile Lake, Alaska, USA (colloidal [0.22 μm–1 kDa] and truly dissolved [<1 kDa] fractions) and in soil pore waters sampled across a gradient of permafrost degradation at the same location. We target the peak flow to base flow transition to show that there is a narrow window of mineral element‐bound DOC colloid transport from soils to streams. We show that during spring thaw and maximum thaw there is an enhanced lateral transfer of mineral element‐bound DOC colloids in extensively degraded sites compared to minimally degraded sites. This is explained by a more rapid response of hydrology at peak flow to base flow transition at degraded sites. Our results suggest that ongoing permafrost degradation and the associated response of soils to changing hydrology can be detected by targeting the composition and size of mineral element‐DOC associations in soil waters and headwater streams during peak flow‐baseflow transitions.

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Measuring and Estimating Fluxes of Carbon, Major and Trace Elements to the Arctic Ocean

Cited by 2 publications

References 71 publications

Climate Change and the Ob River: A Reassessment of Major and Trace Element Fluxes to the Arctic Ocean

Climate Change and the Ob River: A Reassessment of Major and Trace Element Fluxes to the Arctic Ocean

Seasonal Changes in Hydrology and Permafrost Degradation Control Mineral Element‐Bound DOC Transport From Permafrost Soils to Streams

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