Dynamics of Dissolved Inorganic Carbon and CO2 Fluxes between the Water and the Atmosphere in the Main Channel of the Ob River

Pipko, I. I.; Pugach, S. P.; Савичев, Олег Геннадьевич; Репина, И. А.; Shakhova, N. E.; Moiseeva, Yu. A.; Barskov, K. V.; Сергиенко, В. И.; Semiletov, I. P.

doi:10.1134/s0012500819020101

Cited by 15 publications

(13 citation statements)

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“…2E) in the Southern study area. The highest values were reached in the Tom’ River and in the zone influenced by the Chulym River 23 . The spatial distribution of these parameters, on one side, followed the pattern of the permafrost area, and reflected an increase in groundwater supply in the drainage basin with a decrease in latitude 41 .…”

Section: Resultsmentioning

confidence: 94%

“…These molecular imprints might be indicative of high input of relatively fresh, low-degraded DOM from the Vasyugan mire to the middle stream of the Ob River. This can be also indicative of the input of fresh autochthonous organic matter in the South 23 along with the major contribution of the “swamp” DOM. These imprints almost completely disappear after the Ob River receives a huge inflow of the Irtysh River waters (St. 30).…”

Section: Resultsmentioning

confidence: 97%

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Signatures of Molecular Unification and Progressive Oxidation Unfold in Dissolved Organic Matter of the Ob-Irtysh River System along Its Path to the Arctic Ocean

Perminova

Shirshin

Zherebker

et al. 2019

Sci Rep

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The Ob-Irtysh River system is the seventh-longest one in the world. Unlike the other Great Siberian rivers, it is only slightly impacted by the continuous permafrost in its low flow. Instead, it drains the Great Vasyugan mire, which is the world largest swamp, and receives huge load of the Irtysh waters which drain the populated lowlands of the East Siberian Plain. The central challenge of this paper is to understand the processes responsible for molecular transformations of natural organic matter (NOM) in the Ob-Irtysh river system along the South-North transect. For solving this task, the NOM was isolated from the water samples collected along the 3,000 km transect using solid-phase extraction. The NOM samples were further analyzed using high resolution mass spectrometry and optical spectroscopy. The obtained results have shown a distinct trend both in molecular composition and diversity of the NOM along the South-North transect: the largest diversity was observed in the Southern “swamp-wetland” stations. The samples were dominated with humic and lignin-like components, and enriched with aminosugars. After the Irtysh confluence, the molecular nature of NOM has changed drastically: it became much more oxidized and enriched with heterocyclic N-containing compounds. These molecular features are very different from the aliphatics-rich permafrost NOM. They witnesses much more conservative nature of the NOM discharged into the Arctic by the Ob-Irtysh river system. In general, drastic reduction in molecular diversity was observed in the northern stations located in the lower Ob flow.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 97%

Signatures of Molecular Unification and Progressive Oxidation Unfold in Dissolved Organic Matter of the Ob-Irtysh River System along Its Path to the Arctic Ocean

Perminova

Shirshin

Zherebker

et al. 2019

Sci Rep

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“…As such, we followed the progression of the spring and moved from the southwest to the northeast, thus collecting river water at approximately the same stage of maximal discharge. Note that transect sampling is a common way to assess river water chemistry in extreme environments (Huh and Edmond, 1999;Spence and Telmer, 2005), and generally, a single sampling during high-flow season provides the best agreement with timeseries estimates (Qin et al, 2006). Regular stops each 80-100 km along the Lena River allowed sampling for major hydrochemical parameters and CH 4 along the main stem.…”

Section: Lena River and Its Tributariesmentioning

confidence: 99%

Fluvial carbon dioxide emission from the Lena River basin during the spring flood

et al. 2021

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Abstract. Greenhouse gas (GHG) emission from inland waters of permafrost-affected regions is one of the key factors of circumpolar aquatic ecosystem response to climate warming and permafrost thaw. Riverine systems of central and eastern Siberia contribute a significant part of the water and carbon (C) export to the Arctic Ocean, yet their C exchange with the atmosphere remains poorly known due to lack of in situ GHG concentration and emission estimates. Here we present the results of continuous in situ pCO2 measurements over a 2600 km transect of the Lena River main stem and lower reaches of 20 major tributaries (together representing a watershed area of 1 661 000 km2, 66 % of the Lena's basin), conducted at the peak of the spring flood. The pCO2 in the Lena (range 400–1400 µatm) and tributaries (range 400–1600 µatm) remained generally stable (within ca. 20 %) over the night–day period and across the river channels. The pCO2 in tributaries increased northward with mean annual temperature decrease and permafrost increase; this change was positively correlated with C stock in soil, the proportion of deciduous needleleaf forest, and the riparian vegetation. Based on gas transfer coefficients obtained from rivers of the Siberian permafrost zone (k=4.46 m d−1), we calculated CO2 emission for the main stem and tributaries. Typical fluxes ranged from 1 to 2 gCm-2d-1 (>99 % CO2, <1 % CH4), which is comparable with CO2 emission measured in the Kolyma, Yukon, and Mackenzie rivers and permafrost-affected rivers in western Siberia. The areal C emissions from lotic waters of the Lena watershed were quantified by taking into account the total area of permanent and seasonal water of the Lena basin (28 000 km2 ). Assuming 6 months of the year to be an open water period with no emission under ice, the annual C emission from the whole Lena basin is estimated as 8.3±2.5 Tg C yr−1, which is comparable to the DOC and dissolved inorganic carbon (DIC) lateral export to the Arctic Ocean.

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“…It is important to note that, unlike it was reported for water pCO2 and molecular composition of riverine DOM (i.e., 17,18,19], the Irtysh River does not play a regulatory role of the lower Ob River water chemistry in terms of concentrations of other major and trace elements including organomineral colloids. Instead, the hydrochemical conditions of the Ob River are shaped by integration of multiple tributaries those chemical composition gradually changes along the permafrost and landscape gradient, as it is known for other river basins of western Siberia such as Taz and Pur [36].…”

Section: Discussionmentioning

confidence: 63%

“…These included DOC time series observation by molecular-level techniques [15] and via remote sensing [16] and quantification of particulate organic matter export [7]. In contrast, spatial coverage of the river main stem and tributaries is rather low, with just a few studies of the dissolved carbon and related CO2 and CH4 emissions [17,18] and one study of molecular composition of DOC [19]. Large amount of data are available from systematic State Rosgidromet monitoring of OC and major ions on four gauging stations of the Ob River (Salekhard, Belogor'e, Aleksandrovskoe and Kolpashevo) during 1970-2010 and measurements by Tomsk Politechnical University as summarized in ref.…”

Section: Introductionmentioning

confidence: 99%

Landscape, Soil, Lithology, Climate and Permafrost Control on Dissolved Carbon, Major and Trace Elements in the Ob River, Western Siberia

Kolesnichenko¹,

Kolesnichenko²,

Vorobyev³

et al. 2021

Preprint

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Assuming that climate warming in the WSL will lead to a northward shift of the forest and permafrost boundaries, a “substituting space for time” approach predicts an increase in concentration of DIC and labile major and trace elements and a decrease of the transport of DOC and low soluble trace metals in the form of colloids in the main stem of the Ob River. However, an unknown factor is the change in hydrochemistry of the largest southern tributary, the Irtysh River, which is impacted by permafrost-free steppe and forest-steppe zone. Overall, seasonally-resolved transect studies of large riverine systems of western Siberia are needed to assess the hydrochemical response of this environmentally-important territory to on-going climate change.

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Dynamics of Dissolved Inorganic Carbon and CO2 Fluxes between the Water and the Atmosphere in the Main Channel of the Ob River

Cited by 15 publications

References 15 publications

Signatures of Molecular Unification and Progressive Oxidation Unfold in Dissolved Organic Matter of the Ob-Irtysh River System along Its Path to the Arctic Ocean

Signatures of Molecular Unification and Progressive Oxidation Unfold in Dissolved Organic Matter of the Ob-Irtysh River System along Its Path to the Arctic Ocean

Fluvial carbon dioxide emission from the Lena River basin during the spring flood

Landscape, Soil, Lithology, Climate and Permafrost Control on Dissolved Carbon, Major and Trace Elements in the Ob River, Western Siberia

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