A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
CH4 oxidation in a boreal lake during the development of hypolimnetic hypoxia (2020)

Saarela, T., Rissanen, A. J., Ojala, A., Pumpanen, J., Aalto, S. L., Tiirola, M., Vesala, T., & Jäntti, H. (2020). CH4 oxidation in a boreal lake during the development of hypolimnetic hypoxia. Aquatic Sciences, 82, Article 19. https://doi.org/10.1007/s00027-019-0690-8

JYU-tekijät tai -toimittajat

Tiirola, Marja

Julkaisun tiedot

Julkaisun kaikki tekijät tai toimittajat: Saarela, Taija; Rissanen, Antti J.; Ojala, Anne; Pumpanen, Jukka; Aalto, Sanni L.; Tiirola, Marja; Vesala, Timo; Jäntti, Helena

Lehti tai sarja: Aquatic Sciences

ISSN: 1015-1621

eISSN: 1420-9055

Julkaisuvuosi: 2020

Volyymi: 82

Artikkelinumero: 19

Kustantaja: Birkhaeuser Science

Julkaisumaa: Sveitsi

Julkaisun kieli: englanti

DOI: https://doi.org/10.1007/s00027-019-0690-8

Julkaisun avoin saatavuus: Avoimesti saatavilla

Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava

Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/67403

Tiivistelmä

Freshwater ecosystems represent a significant natural source of methane (CH4). CH4 produced through anaerobic decomposition of organic matter (OM) in lake sediment and water column can be either oxidized to carbon dioxide (CO2) by methanotrophic microbes or emitted to the atmosphere. While the role of CH4 oxidation as a CH4 sink is widely accepted, neither the magnitude nor the drivers behind CH4 oxidation are well constrained. In this study, we aimed to gain more specific insight into CH4 oxidation in the water column of a seasonally stratified, typical boreal lake, particularly under hypoxic conditions. We used 13CH4 incubations to determine the active CH4 oxidation sites and the potential CH4 oxidation rates in the water column, and we measured environmental variables that could explain CH4 oxidation in the water column. During hypolimnetic hypoxia, 91% of available CH4 was oxidized in the active CH4 oxidation zone, where the potential CH4 oxidation rates gradually increased from the oxycline to the hypolimnion. Our results showed that in warm springs, which become more frequent, early thermal stratification with cold well-oxygenated hypolimnion delays the period of hypolimnetic hypoxia and limits CH4 production. Thus, the delayed development of hypolimnetic hypoxia may partially counteract the expected increase in the lacustrine CH4 emissions caused by the increasing organic carbon load from forested catchments.

YSO-asiasanat: boreaalinen vyöhyke; järvet; kasvihuonekaasut; hypoksia; metaani; hapetus; isotoopit; kerrostumat

Vapaat asiasanat: boreal lake; greenhouse gases; hypoxia; methane; oxidation; stable isotopes; stratification

Liittyvät organisaatiot

Hankkeet, joissa julkaisu on tehty

OKM-raportointi: Kyllä

Raportointivuosi: 2020

JUFO-taso: 1