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High riverine CO2 emissions at the permafrost boundary of Western Siberia
Umeå universitet, Teknisk-naturvetenskapliga fakulteten, Institutionen för ekologi, miljö och geovetenskap.
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2018 (Engelska)Ingår i: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 11, nr 11, s. 825-+Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The fate of the vast stocks of organic carbon stored in permafrost of the Western Siberian Lowland, the world's largest peat-land, is uncertain. Specifically, the amount of greenhouse gas emissions from rivers in the region is unknown. Here we present estimates of annual CO2 emissions from 58 rivers across all permafrost zones of the Western Siberian Lowland, between 56 and 67 degrees N. We find that emissions peak at the permafrost boundary, and decrease where permafrost is more prevalent and in colder climatic conditions. River CO2 emissions were high, and on average two times greater than downstream carbon export. We suggest that high emissions and emission/export ratios are a result of warm temperatures and the long transit times of river water. We show that rivers in the Western Siberian Lowland play an important role in the carbon cycle by degassing terrestrial carbon before its transport to the Arctic Ocean, and suggest that changes in both temperature and precipitation are important for understanding and predicting high-latitude river CO2 emissions in a changing climate.

Ort, förlag, år, upplaga, sidor
Nature Publishing Group, 2018. Vol. 11, nr 11, s. 825-+
Nationell ämneskategori
Miljövetenskap
Identifikatorer
URN: urn:nbn:se:umu:diva-153694DOI: 10.1038/s41561-018-0218-1ISI: 000448672100007OAI: oai:DiVA.org:umu-153694DiVA, id: diva2:1268269
Forskningsfinansiär
Vetenskapsrådet, 325-2014-6898Tillgänglig från: 2018-12-05 Skapad: 2018-12-05 Senast uppdaterad: 2019-08-22Bibliografiskt granskad
Ingår i avhandling
1. Carbon Emissions from Western Siberian Inland Waters
Öppna denna publikation i ny flik eller fönster >>Carbon Emissions from Western Siberian Inland Waters
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Umeå: Umeå University, 2019. s. 29
Nyckelord
carbon, carbon dioxide, methane, carbon emissions, river, lake, inland waters, permafrost, Siberia
Nationell ämneskategori
Miljövetenskap Naturgeografi
Forskningsämne
limnologi
Identifikatorer
urn:nbn:se:umu:diva-162581 (URN)978-91-7855-107-1 (ISBN)
Disputation
2019-09-27, Stora Hörsalen, KBC huset, Linnaeus väg 6, Umeå, 09:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2019-09-06 Skapad: 2019-08-22 Senast uppdaterad: 2019-09-02Bibliografiskt granskad

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Serikova, Svetlana

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Serikova, SvetlanaKarlsson, Jon
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