Environmental controllers for carbon emission and concentration patterns in Siberian rivers during different seasons

Krickov, Ivan V.; Lim, Artem G.; Shirokova, Liudmila S.; Korets, Mikhail; Karlsson, Jan; Pokrovsky, Oleg S.

doi:10.1016/j.scitotenv.2022.160202

Cited by 12 publications

(4 citation statements)

References 88 publications

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“…The Khule River (Torgalyg), a right tributary of the Shagonar River, originates on the northern macroscline of the Eastern Tannu-Ola, flows through the Central Tuva Basin. The length of the river is 40 km, the width varies from 0.5 to 1.5 m, the catchment area is 610 km 2 . Altitude above sea level: 535 m [113].…”

Section: Discussionmentioning

confidence: 99%

“…Future research will focus on relating the GIS-based specific watershed parameters (including soils, vegetation, climate and lithology) and CO 2 emissions pattern, as it was recently developed for a number of rivers in Siberia (e.g., refs. [2,72,74]).…”

Section: Dissolved C Pattern and Co 2 Fluxes: Driving Factors And Com...mentioning

confidence: 99%

“…The carbon (C) cycle in inland waters, including the dissolved and particulate concentrations of carbon and the carbon dioxide (CO 2 ) emissions, are at the forefront of biogeochemical studies, especially in the regions most sensitive to ongoing climate change such as boreal and subarctic zones [1][2][3][4][5][6][7][8][9][10] or the tropical/equatorial belt [11][12][13][14]. In contrast to these numerous works, C storage, transport and emission in central continental, mountain and arid regions remain strongly understudied, due either to limited access and logistics or to the still underestimated potential role of these remote territories in C cycling in inland waters.…”

Section: Introductionmentioning

confidence: 99%

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Dissolved Carbon Concentrations and Emission Fluxes in Rivers and Lakes of Central Asia (Sayan–Altai Mountain Region, Tyva)

Byzaakay,

Kolesnichenko,

Kolesnichenko

et al. 2023

Water

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The carbon (C) cycle in inland waters, including carbon concentrations in and carbon dioxide (CO2) emissions from water surfaces, are at the forefront of biogeochemical studies, especially in regions strongly impacted by ongoing climate change. Towards a better understanding of C storage, transport and emission in Central Asian mountain regions, an area of knowledge that has been extremely poorly studied until now, here, we carried out systematic measurements of dissolved C and CO2 emissions in rivers and lakes located along a macrotransect of various natural landscapes in the Sayan–Altai mountain region, from the high mountains of the Western Sayan in the northwest of Tyva to the arid (dry) steppes and semideserts in the intermountain basins in the southeast of Tyva on the border with Mongolia. New data on major hydrochemical parameters and CO2 fluxes (fCO2) gathered by floating chambers and dissolved organic and inorganic carbon (DOC and DIC, respectively) concentrations collected over the four main hydrological seasons allowed us to assess the current C biogeochemical status of these water bodies in order to judge possible future changes under climate warming. We further tested the impact of permafrost, river watershed size, lake area and climate parameters as well as ‘internal’ biogeochemical drivers (pH, mineralization, organic matter quality and bacterial population) on CO2 concentration and emissions in lakes and rivers of this region and compared them with available data from other subarctic and mountain settings. We found strong environmental control of the CO2 pattern in the studied water bodies, with thermokarst lakes being drastically different from other lakes. In freshwater lakes, pCO2 negatively correlated with O2, whereas the water temperature exerted a positive impact on pCO2 in large rivers. Overall, the large complexity of counteracting external and internal drivers of CO2 exchange between the water surfaces and the atmosphere (CO2-rich underground DIC influx and lateral soil and subsurface water; CO2 production in the water column due to dissolved and particulate OC biodegradation; CO2 uptake by aquatic biota) precluded establishing simple causalities between a single environmental parameter and the fCO2 of rivers and lakes. The season-averaged CO2 emission flux from the rivers of Tyva measured in this study was comparable, with some uncertainty, to the C uptake fluxes from terrestrial ecosystems of the region, which were assessed in other works.

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Section: Discussionmentioning

confidence: 99%

Section: Dissolved C Pattern and Co 2 Fluxes: Driving Factors And Com...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dissolved Carbon Concentrations and Emission Fluxes in Rivers and Lakes of Central Asia (Sayan–Altai Mountain Region, Tyva)

Byzaakay,

Kolesnichenko,

Kolesnichenko

et al. 2023

Water

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“…Additionally, the in-water production of DOC from aquatic plants and algae [87], as well as inputs from rainwater [88], is of higher importance than previously thought. Numerous studies have been undertaken to quantify DOC mineralization and burial [84,89,90]. Synthesizing these studies offers opportunities for developing state-of-the-art approaches to model the processes of DOC transit in inland waters.…”

Section: Opportunities In Model Developmentmentioning

confidence: 99%

Modeling exports of dissolved organic carbon from landscapes: a review of challenges and opportunities

Wei,

Hayes,

Butman

et al. 2024

Environ. Res. Lett.

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Inland waters receive large quantities of dissolved organic carbon (DOC) from soils and act as conduits for the lateral transport of this terrestrially derived carbon, ultimately storing, mineralizing, or delivering it to oceans. The lateral DOC flux plays a crucial role in the global carbon cycle, and numerous models have been developed to estimate the DOC export from different landscapes. We reviewed 34 published models and compared their characteristics to identify challenges in model applications and opportunities in future model development. We classified these models into three types: indicator-driven, hydrology-forced, and process-based DOC export simulation models. They differ mainly in their environmental inputs, simulation approaches for soil DOC production, leaching from soils to inland waters, and transit through inland waters. It is essential to consider landscape characteristics, climate conditions, available data, and research questions when selecting the most appropriate model. Given the substantial assumptions associated with these models, sufficient measurements are required to benchmark estimates. Accurate accounting of terrestrially derived DOC export to oceans requires incorporating the DOC produced in aquatic ecosystems and deposited with rainwater; otherwise, global export estimates may be overestimated by 40.7%. Additionally, improving the representation of mineralization and burial processes in inland waters allows for more accurate accounting of carbon sequestration through land ecosystems. When all the inland water processes are ignored or assuming DOC leaching is equivalent to DOC export, the loss of soil carbon through this lateral flux could be underestimated by 43.9%.

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The impact of the acidic polysaccharides pool on CO2 concentrations and fluxes: A case study on urban waters of China

Liu,

Huang,

et al. 2024

Ecological Indicators

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Environmental controllers for carbon emission and concentration patterns in Siberian rivers during different seasons

Cited by 12 publications

References 88 publications

Dissolved Carbon Concentrations and Emission Fluxes in Rivers and Lakes of Central Asia (Sayan–Altai Mountain Region, Tyva)

Dissolved Carbon Concentrations and Emission Fluxes in Rivers and Lakes of Central Asia (Sayan–Altai Mountain Region, Tyva)

Modeling exports of dissolved organic carbon from landscapes: a review of challenges and opportunities

The impact of the acidic polysaccharides pool on CO2 concentrations and fluxes: A case study on urban waters of China

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