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Carbon emission from the boreal floodplain of Ob’ River
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.
University of Toulouse.ORCID iD: 0000-0002-3155-7069
Tomsk State University.
Tomsk State University.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

The Ob’ River floodplain is the second largest floodplain in the world. Despite its vast area, estimates of carbon (C) emissions from the Ob’ River floodplain are largely absent. Here we present seasonal C emission and water area extent from the main channel and the floodplain along a ~4 km reach in the boreal zone of the Ob’ River. We find strong seasonality in water area extent of the Ob’ main channel (~1.8 km2) and floodplain (~3 km2) with water covering 34% of land during flood and subsequently declining to ~16 and 14% during summer and autumn baseflow, respectively. The C emissions also showed seasonal differences over the open water period ranging from 4.66 to -4.25 g C m-2 d-1 for the Ob’ main channel and from 0.03 to 1.42 g C m-2 d-1 for the floodplain. The total annual C emission from the study reach was ~940 ± 744 t C yr-1 with the floodplain accounting for ~16%. The contribution of the floodplain to the net river C evasion can be even greater in northern regions of the Ob’ River basin, where floodplain soils are more C-rich and are underlain by permafrost, and in years with more extensive flooding.

Keywords [en]
carbon, carbon emissions, inland waters, floodpain, Western Siberia, Ob River
National Category
Environmental Sciences Physical Geography
Research subject
Limnology
Identifiers
URN: urn:nbn:se:umu:diva-162580OAI: oai:DiVA.org:umu-162580DiVA, id: diva2:1345038
Available from: 2019-08-22 Created: 2019-08-22 Last updated: 2019-09-02
In thesis
1. Carbon Emissions from Western Siberian Inland Waters
Open this publication in new window or tab >>Carbon Emissions from Western Siberian Inland Waters
2019 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Inland waters (i.e. rivers, streams, lakes, ponds) emit carbon (C) into the atmosphere. The magnitude of global inland water C emission has been estimated to equal the global ocean C sink, thus making inland waters an important component of the global C cycle. Yet, the data used in estimating the magnitude of global inland water C emission lacks measurements of inland water C emissions from permafrost-affected regions in general and from Russia in particular, despite permafrost covering ~25% of the Northern Hemisphere and ~65% of Russia. This lack of data questions the accuracy of the current estimate of global inland water C emission and its predictive power in assessing changes in the global C cycle following permafrost thaw.

In this thesis, we conducted detailed measurements of river and lake C emissions across ~1000 km permafrost gradient of Western Siberia (from permafrost-free to continuous permafrost zone) and assessed the magnitude of the total C emission from Western Siberian inland waters. We found that river and lake C emissions varied across the permafrost gradient with river C emissions being greatest in areas where permafrost is actively degrading, and lake C emissions being greatest in areas where permafrost is still intact. We also found that river and lake C emissions are likely driven by different factors with river C emissions being mainly controlled by temperature and hydrological conditions, whereas lake C emissions by sediment respiration and availability of recently thawed organic C. Further, we estimated the total C emission from Western Siberian inland waters to be greater than previously thought and exceeding the C export from this region to the Arctic Ocean. Such finding implies that a major part of the terrestrially-derived C is lost in Western Siberian inland waters, making this region a hotspot for inland water C emission following permafrost thaw. We also showed that apart from C emissions measurements across different inland water types and across the landscape, estimates of inland water surface areas are needed for accurate assessments of the total inland water C emission of any given region. Particularly, water surface areas of streams and ponds as well as inundated floodplains, especially in years of extreme flood events, are important for quantifying the total inland water C emission. Overall, this thesis presents new data related to C emissions from rivers and lakes in an area that undergoes rapid permafrost thaw, and urges to account for all inland water types and their respective water surface areas when attempting to achieve unbiased estimates of the inland water contribution to the atmospheric C budget.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2019. p. 29
Keywords
carbon, carbon dioxide, methane, carbon emissions, river, lake, inland waters, permafrost, Siberia
National Category
Environmental Sciences Physical Geography
Research subject
Limnology
Identifiers
urn:nbn:se:umu:diva-162581 (URN)978-91-7855-107-1 (ISBN)
Public defence
2019-09-27, Stora Hörsalen, KBC huset, Linnaeus väg 6, Umeå, 09:00 (English)
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Supervisors
Available from: 2019-09-06 Created: 2019-08-22 Last updated: 2019-09-02Bibliographically approved

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Serikova, SvetlanaSiewert, Matthias B.Vachon, DominicKarlsson, Jan

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