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Significant fraction of CO2 emissions from boreal lakes derived from hydrologic inorganic carbon inputs
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0003-3509-8266
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2015 (English)In: Nature Geoscience, ISSN 1752-0894, E-ISSN 1752-0908, Vol. 8, no 12, 933-936 p.Article in journal (Refereed) Published
Abstract [en]

Annual CO2 emissions from lakes and other inland waters into the atmosphere are estimated to almost entirely compensate the total annual carbon uptake by oceans. CO2 supersaturation in lakes, which results in CO2 emissions, is frequently attributed to CO2 produced within the lake. However, lateral inorganic carbon flux through watersheds can also be sizeable. Here we calculated lake surface water CO2 concentrations and emissions using lake pH, alkalinity and temperature from a compilation of data from 5,118 boreal lakes. Autumn surface water CO2 concentrations and CO2 emissions from the 5,118 lakes co-varied with lake internal autumn CO2 production. However, using a mass balance approach we found that CO2 emission in the majority of lakes was sustained by inorganic carbon loading from the catchment rather than by internal CO2 production. Small lakes with high dissolved organic carbon and phosphorus concentrations, shorter retention times and longer ice-free seasons had the highest CO2 concentrations. CO2 emissions from these small lakes was twice that of comparable lakes in colder regions, and similar to emissions from subtropical and tropical lakes. We conclude that changes in land use and climate that increase dissolved inorganic carbon may cause emission levels from boreal lakes to approach those of lakes in warmer regions.

Place, publisher, year, edition, pages
2015. Vol. 8, no 12, 933-936 p.
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-267024DOI: 10.1038/NGEO2582ISI: 000367200200015OAI: oai:DiVA.org:uu-267024DiVA: diva2:871702
Funder
Swedish Research CouncilSwedish Research Council FormasKnut and Alice Wallenberg Foundation
Available from: 2015-11-16 Created: 2015-11-16 Last updated: 2017-12-01Bibliographically approved

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Weyhenmeyer, GesaWallin, MarcusTranvik, Lars

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