Dissolved Oxygen, Silicon, Phosphorous and Suspended Matter Concentrations During the Spring Breakup of the Lena River

Pivovarov, S.; Hölemann, Jens; Kassens, Heidemarie; Antonow, Martin; Dmitrenko, Igor

doi:10.1007/978-3-642-60134-7_23

Cited by 26 publications

(40 citation statements)

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“…During AugustSeptember, when the river discharge is low but the rates of coastal erosion are highest, the mean PM concentration (24.2 mg l −1 in the surface layer and 25.4 mg l −1 in the near bottom layer, Semiletov et al, 2005) obtained over the western part of the ESAS inner shelf (>40 m in depth) is several times higher than that reported for the Lena River-Laptev Sea shelf system during the "surge freshet" (Pivovarov et al, 1999). This controversy between the paradigm of a "dominant" role for the surge freshet in Lena River discharge of solids vs. the importance of the Lena's summer discharge can be resolved because rates of river bank erosion are maximum during the warmest months of August and September; this erosion has the potential to bring more PM/POC per Lena River water unit than in flooding time (May-early June) when the upper soil body in the low Lena stream is still frozen.…”

Section: Fluvial Transport and Sedimentation In The Lenamentioning

confidence: 64%

“…PM in the western part of the ESAS ranged between 4.7 mg l −1 and 79.7 mg l −1 in the surface water, and between 5.2 mg l −1 and 106.4 mg l −1 in the near-bottom water , vs. up to 20 mg l −1 during the flooding peak, with a maximum of 70 mg l −1 observed at one station located near the main channel (Bol'shaya Trofimovskaya) outlet (Pivovarov et al, 1999). During AugustSeptember, when the river discharge is low but the rates of coastal erosion are highest, the mean PM concentration (24.2 mg l −1 in the surface layer and 25.4 mg l −1 in the near bottom layer, Semiletov et al, 2005) obtained over the western part of the ESAS inner shelf (>40 m in depth) is several times higher than that reported for the Lena River-Laptev Sea shelf system during the "surge freshet" (Pivovarov et al, 1999).…”

Section: Fluvial Transport and Sedimentation In The Lenamentioning

confidence: 95%

“…However, sediment transport dynamics during breakup are poorly known and the limited data that exist are controversial. For example, Pivovarov et al (1999) showed an increase of particulate matter (PM) concentration from the clear winter water in May (0.5-3 mg l −1 ) up to 20 mg l −1 during the flooding peak, with a maximum of 70 mg l −1 observed at one station located near the main channel (Bol'shaya Trofimovskaya) outlet. A similar range of PM concentrations was observed along the Lena River after breakup time (late June-August), as discussed in this paper.…”

Section: Introductionmentioning

confidence: 99%

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Carbon transport by the Lena River from its headwaters to the Arctic Ocean, with emphasis on fluvial input of terrestrial particulate organic carbon vs. carbon transport by coastal erosion

et al. 2011

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Abstract. The Lena River integrates biogeochemical signals from its vast drainage basin, and the integrated signal reaches far out over the Arctic Ocean. Transformation of riverine organic carbon (OC) into mineral carbon, and mineral carbon into the organic form in the Lena River watershed, can be considered to be quasi-steady-state processes. An increase in Lena discharge exerts opposite effects on total organic (TOC) and total inorganic (TCO 2 ) carbon: TOC concentration increases, while TCO 2 concentration decreases. Significant inter-annual variability in mean values of TCO 2 , TOC, and their sum (total carbon, TC) has been found. This variability is determined by changes in land hydrology which cause differences in the Lena River discharge. There is a negative correlation in the Lena River between TC in September and its mean discharge in August; a time shift of about one month is required for water to travel from Yakutsk to the Laptev Sea. Total carbon entering the sea with the Lena discharge is estimated to be almost 10 Tg C yr −1 . The annual Lena River discharge of particulate organic carbon (POC) can be as high as 0.38 Tg (moderate to high estimate). If we instead accept Lisytsin's (1994) statement that 85-95 % of total particulate matter (PM) (and POC) precipitates on the marginal "filter", then only about 0.03-0.04 Tg of Lena River POC reaches the Laptev Sea. The Lena's POC export would then be two orders of magnitude less than the annual input of eroded terrestrial carbon onto the shelf of the Laptev and East SiberianCorrespondence to: I. P. Semiletov (igorsm@iarc.uaf.edu) seas, which is estimated to be about 4 Tg. Observations support the hypothesis of a dominant role for coastal erosion (Semiletov, 1999a, b) in East Siberian Arctic Shelf (ESAS) sedimentation and the dynamics of the carbon/carbonate system. The Lena River is characterized by relatively high concentrations of the primary greenhouse gases, dissolved carbon dioxide (CO 2 ) and methane (CH 4 ). During all seasons the river is supersaturated in CO 2 compared to the atmosphere, by up to 1.5-2 fold in summer, and 4-5 fold in winter. This results in a significant CO 2 supersaturation in the adjacent coastal sea. Localized areas of dissolved CH 4 along the Lena River and in the Lena delta channels may reach 100 nM, but the CH 4 concentration decreases to 5-20 nM towards the sea, which suggests that riverborne export of CH 4 plays but a minor role in determining the ESAS CH 4 budget in coastal waters. Instead, the seabed appears to be the source that provides most of the CH 4 to the Arctic Ocean.

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Section: Fluvial Transport and Sedimentation In The Lenamentioning

confidence: 64%

Section: Fluvial Transport and Sedimentation In The Lenamentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Carbon transport by the Lena River from its headwaters to the Arctic Ocean, with emphasis on fluvial input of terrestrial particulate organic carbon vs. carbon transport by coastal erosion

et al. 2011

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“…Marine organic carbon is derived from open-water production during the ice-free months, export of ice algae, and new production in polynyas (Sakshaug et al, 2004;Nitishinsky et al 2007). Generally, marine productivity in the Laptev Sea is low and controlled by the nutrients derived from Atlantic water, but spring outflow from the Lena River provides an additional temporary land-derived nutrient source (Pivovarov et al, 1999;Sakshaug et al, 2004;Nitishinsky et al, 2007;Bourgeois et al, 2017) during late spring ice melt (Raymond et al, 2007). Terrestrially derived nutrients can also directly affect marine productivity by new production, or indirectly due to plankton production from remineralized, terrestrially derived dissolved organic carbon and particulate organic carbon Tesi et al, 2017).…”

Section: Marine Versus Terrestrial Organic Matter Contributionmentioning

confidence: 99%

Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment

et al. 2018

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Abstract. The Siberian Arctic Sea shelf and slope is a key region for the degradation of terrestrial organic material transported from the organic-carbon-rich permafrost regions of Siberia. We report on sediment carbon mineralization rates based on O 2 microelectrode profiling; intact sediment core incubations; 35 S-sulfate tracer experiments; pore-water dissolved inorganic carbon (DIC); δ 13 C DIC ; and iron, manganese, and ammonium concentrations from 20 shelf and slope stations. This data set provides a spatial overview of sediment carbon mineralization rates and pathways over large parts of the outer Laptev and East Siberian Arctic shelf and slope and allows us to assess degradation rates and efficiency of carbon burial in these sediments. Rates of oxygen uptake and iron and manganese reduction were comparable to temperate shelf and slope environments, but bacterial sulfate reduction rates were comparatively low. In the topmost 50 cm of sediment, aerobic carbon mineralization dominated degradation and comprised on average 84 % of the depthintegrated carbon mineralization. Oxygen uptake rates and anaerobic carbon mineralization rates were higher in the eastern East Siberian Sea shelf compared to the Laptev Sea shelf. DIC / NH + 4 ratios in pore waters and the stable carbon isotope composition of remineralized DIC indicated that the degraded organic matter on the Siberian shelf and slope was a mixture of marine and terrestrial organic matter. Based on dual end-member calculations, the terrestrial organic carbon contribution varied between 32 and 36 %, with a higher contribution in the Laptev Sea than in the East Siberian Sea. Extrapolation of the measured degradation rates using isotope end-member apportionment over the outer shelf of the Laptev and East Siberian seas suggests that about 16 Tg C yr −1 is respired in the outer shelf seafloor sediment. Of the organic matter buried below the oxygen penetration depth, between 0.6 and 1.3 Tg C yr −1 is degraded by anaerobic processes, with a terrestrial organic carbon contribution ranging between 0.3 and 0.5 Tg yr −1 .

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“…Létolle et al, 1993;RArcticNET, 2011). The riverine influence reveals a strong seasonality with highest freshwater input during and briefly after the spring breakup in June (Pivovarov et al, 1999). In summer the shelf hydrography functions like an estuarine system that derives its water and material from both terrestrial and oceanic sources (e.g.…”

Section: Introductionmentioning

confidence: 99%

Interannual variability of surface and bottom sediment transport on the Laptev Sea shelf during summer

et al. 2013

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Sediment transport dynamics were studied during ice-free conditions under different atmospheric circulation regimes on the Laptev Sea shelf (Siberian Arctic). To study the interannual variability of suspended particulate matter (SPM) dynamics and their coupling with the variability in surface river water distribution on the Laptev Sea shelf, detailed oceanographic, optical (turbidity and Ocean Color satellite data), and hydrochemical (nutrients, SPM, stable oxygen isotopes) process studies were carried out continuously during the summers of 2007 and 2008. Thus, for the first time SPM and nutrient variations on the Laptev Sea shelf under different atmospheric forcing and the implications for the turbidity and transparency of the water column can be presented. <br><br> The data indicate a clear link between different surface distributions of riverine waters and the SPM transport dynamics within the entire water column. The summer of 2007 was dominated by shoreward winds and an eastward transport of riverine surface waters. The surface SPM concentration on the southeastern inner shelf was elevated, which led to decreased transmissivity and increased light absorption. Surface SPM concentrations in the central and northern Laptev Sea were comparatively low. However, the SPM transport and concentration within the bottom nepheloid layer increased considerably on the entire eastern shelf. The summer of 2008 was dominated by offshore winds and northward transport of the river plume. The surface SPM transport was enhanced and extended onto the mid-shelf, whereas the bottom SPM transport and concentration was diminished. This study suggests that the SPM concentration and transport, in both the surface and bottom nepheloid layers, are associated with the distribution of riverine surface waters which are linked to the atmospheric circulation patterns over the Laptev Sea and the adjacent Arctic Ocean during the open water season. A continuing trend toward shoreward winds, weaker stratification and higher SPM concentration throughout the water column might have severe consequences for the ecosystem on the Laptev Sea shelf

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Dissolved Oxygen, Silicon, Phosphorous and Suspended Matter Concentrations During the Spring Breakup of the Lena River

Cited by 26 publications

References 3 publications

Carbon transport by the Lena River from its headwaters to the Arctic Ocean, with emphasis on fluvial input of terrestrial particulate organic carbon vs. carbon transport by coastal erosion

Carbon transport by the Lena River from its headwaters to the Arctic Ocean, with emphasis on fluvial input of terrestrial particulate organic carbon vs. carbon transport by coastal erosion

Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment

Interannual variability of surface and bottom sediment transport on the Laptev Sea shelf during summer

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