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Forskningsartikel2018Vetenskapligt granskad

High riverine CO2 emissions at the permafrost boundary of Western Siberia

Serikova, S.; Pokrovsky, O. S.; Ala-Aho, P.; Kazantsev, V.; Kirpotin, S. N.; Kopysov, S. G.; Krickov, I. V.; Laudon, H.; Manasypov, R. M.; Shirokova, L. S.; Soulsby, C.; Tetzlaff, D.; Karlsson, J.

Sammanfattning

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.

Publicerad i

Nature Geoscience
2018, Volym: 11, nummer: 11, sidor: 825-829 Utgivare: NATURE PUBLISHING GROUP

    Globala målen

    SDG13 Bekämpa klimatförändringarna

    UKÄ forskningsämne

    Oceanografi, hydrologi, vattenresurser

    Publikationens identifierare

    DOI: https://doi.org/10.1038/s41561-018-0218-1

    Permanent länk till denna sida (URI)

    https://res.slu.se/id/publ/96983