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Minor impacts of rain on methane flux from hemiboreal, boreal, and subarctic lakes
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.ORCID-id: 0000-0003-0934-2077
Linköpings universitet, Institutionen för tema, Tema Miljöförändring. Linköpings universitet, Filosofiska fakulteten.
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2023 (Engelska)Ingår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 895, artikel-id 164849Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Methane (CH4) emissions (FCH4) from northern freshwater lakes are not only significant but also highly variable in time and one driver variable suggested to be important is precipitation. Rain can have various, potentially large effects on FCH4 across multiple time frames, and verifying the impact of rain on lake FCH4 is key to understand both contemporary flux regulation, and to predict future FCH4 related to possible changes in frequency and intensity of rainfall from climate change. The main objective of this study was to assess the short-term impact of typically occurring rain events with different intensity on FCH4 from various lake types located in hemiboreal, boreal, and subarctic Sweden. In spite of high time resolution automated flux measurements across different depth zones and covering numerous commonly types of rain events in northern areas, in general, no strong impact on FCH4 during and within 24 h after the rainfall could be observed. Only in deeper lake areas and during longer rain events FCH4 was weakly related to rain (R2 = 0.29, p < 0.05), where a minor FCH4 decrease during the rain was identified, suggesting that direct rainwater input, during greater rainfall, may decrease FCH4 by dilution of surface water CH4. Overall, this study indicates that typical rain events in the studied regions have minor direct short-term effects on FCH4 from northern lakes and do not enhance FCH4 from shallow and deeper parts of lakes during and up to 24-h after the rainfall. Instead, other factors such as wind speed, water temperature and pressure changes were more strongly correlated with lake FCH4.

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ELSEVIER , 2023. Vol. 895, artikel-id 164849
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Methane; Precipitation; Lakes
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URN: urn:nbn:se:liu:diva-196745DOI: 10.1016/j.scitotenv.2023.164849ISI: 001035402800001PubMedID: 37331406OAI: oai:DiVA.org:liu-196745DiVA, id: diva2:1790257
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Funding Agencies|European Research Council (ERC) under the European Union [725546]; Swedish Research Council [2021-00164]; FORMAS [2016-04829]; Knut and Alice Wallenberg Foundation [2017-00635]; [2018-01794]; [2016.0083]

Tillgänglig från: 2023-08-22 Skapad: 2023-08-22 Senast uppdaterad: 2024-01-10

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