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Emissions from dry inland waters are a blind spot in the global carbon cycle
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences.ORCID iD: 0000-0003-3279-3589
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2019 (English)In: Earth-Science Reviews, ISSN 0012-8252, E-ISSN 1872-6828, Vol. 188, p. 240-248Article, review/survey (Refereed) Published
Abstract [en]

A large part of the world's inland waters, including streams, rivers, ponds, lakes and reservoirs is subject to occasional, recurrent or even permanent drying. Moreover, the occurrence and intensity of drying events are increasing in many areas of the world because of climate change, water abstraction, and land use alteration. Yet, information on the gaseous carbon (C) fluxes from dry inland waters is scarce, thus precluding a comprehensive assessment of C emissions including all, also intermittently dry, inland waters. Here, we review current knowledge on gaseous C fluxes from lotic (streams and rivers) and lentic (ponds, lakes, and reservoirs) inland waters during dry phases and the response to rewetting, considering controls and sources as well as implications of including 'dry' fluxes for local and global scale estimates. Moreover, knowledge gaps and research needs are discussed. Our conservative estimates indicate that adding emissions from dry inland waters to current global estimates of CO2 emissions from inland waters could result in an increase of 0.22 Pg C year(-1), or similar to 10% of total fluxes. We outline the necessary conceptual understanding to successfully include dry phases in a more complete picture of inland water C emissions and identify potential implications for global C cycle feedbacks.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 188, p. 240-248
Keywords [en]
Carbon dioxide, Methane, Intermittent, Stream, River, Lake
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-158609DOI: 10.1016/j.earscirev.2018.11.012ISI: 000463462500011OAI: oai:DiVA.org:umu-158609DiVA, id: diva2:1314403
Available from: 2019-05-08 Created: 2019-05-08 Last updated: 2019-05-08Bibliographically approved

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