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Contribution of gas concentration and transfer velocity to CO2 flux variability in northern lakes
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.ORCID-id: 0000-0003-0934-2077
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.ORCID-id: 0000-0001-7960-0129
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.ORCID-id: 0000-0002-6815-7261
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2024 (Engelska)Ingår i: Limnology and Oceanography, ISSN 0024-3590, E-ISSN 1939-5590Artikel i tidskrift (Refereegranskat) Epub ahead of print
Abstract [en]

The CO( 2)flux (FCO2) from lakes to the atmosphere is a large component of the global carbon cycle anddepends on the air-water CO2concentration gradient (Delta CO2) and the gas transfer velocity (k). Both Delta CO2 and k can vary on multiple timescales and understanding their contributions toFCO(2)is important for explaining var-iability influxes and developing optimal sampling designs. We measuredFCO2 and Delta CO(2 )and derivedkforone full ice-free period in 18 lakes usingfloating chambers and estimated the contributions of Delta CO2 and k to FCO2 variability. Generally, kcontributed more than Delta CO2to short-term (1-9d) FCO2 variability. With in creased temporal period, the contribution of k to FCO2 variability decreased, and in some lakes resulted in Delta CO2 contrib-uting more thank to FCO2 variability over the full ice-free period. Increased contribution of Delta CO2 to FCO2 vari-ability over time occurred across all lakes but was most apparent in large-volume southern-boreal lakes and indeeper (>2m) parts of lakes, whereaskwas linked to FCO(2 )variability in shallow waters. Accordingly, knowing the variability of bothk and Delta CO(2 )over time and space is needed for accurate modeling of F CO2 from these vari-ables. We conclude that priority in FCO(2 )assessments should be given to direct measurements of FCO2 at multiplesites when possible, or otherwise from spatially distributed measurements of Delta CO(2 )combined with k- models that incorporate spatial variability of lake thermal structure and meteorology.

Ort, förlag, år, upplaga, sidor
WILEY , 2024.
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Naturgeografi
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URN: urn:nbn:se:liu:diva-201170DOI: 10.1002/lno.12528ISI: 001163039500001OAI: oai:DiVA.org:liu-201170DiVA, id: diva2:1840682
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Funding Agencies|Knut and Alice Wallenberg Foundation [2016.0083]; European Research Council (ERC) [725546]; Swedish Research Council (VR) [2016-04829]; Swedish Research Council for Sustainable Development (FORMAS) [2018-01794]; VR [2017-00635]; US National Science Foundation (Division of Environmental Biology) [1753856]

Tillgänglig från: 2024-02-26 Skapad: 2024-02-26 Senast uppdaterad: 2024-02-26

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Rudberg, DavidSchenk, JonathanPajala, GustavSawakuchi, HenriqueSieczko, AnnaSundgren, IngridNguyen, Thanh DucBastviken, David
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Tema MiljöförändringFilosofiska fakultetenEkologisk och miljövetenskaplig modelleringTekniska fakulteten
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Limnology and Oceanography
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