Cristin-resultat-ID: 1856955
Sist endret: 6. desember 2021, 16:20
NVI-rapporteringsår: 2020
Resultat
Vitenskapelig artikkel
2020

Modeled Microbial Dynamics Explain the Apparent Temperature Sensitivity of Wetland Methane Emissions

Bidragsytere:
  • Sarah E. Chadburn
  • Tuula Aalto
  • Mika Aurela
  • Dennis Baldocchi
  • Christina Biasi
  • Julia Boike
  • mfl.

Tidsskrift

Global Biogeochemical Cycles
ISSN 0886-6236
e-ISSN 1944-9224
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2020
Volum: 34
Hefte: 11
Artikkelnummer: e2020GB006
Open Access

Importkilder

Scopus-ID: 2-s2.0-85096439087

Beskrivelse Beskrivelse

Tittel

Modeled Microbial Dynamics Explain the Apparent Temperature Sensitivity of Wetland Methane Emissions

Sammendrag

Methane emissions from natural wetlands tend to increase with temperature and therefore may lead to a positive feedback under future climate change. However, their temperature response includes confounding factors and appears to differ on different time scales. Observed methane emissions depend strongly on temperature on a seasonal basis, but if the annual mean emissions are compared between sites, there is only a small temperature effect. We hypothesize that microbial dynamics are a major driver of the seasonal cycle and that they can explain this apparent discrepancy. We introduce a relatively simple model of methanogenic growth and dormancy into a wetland methane scheme that is used in an Earth system model. We show that this addition is sufficient to reproduce the observed seasonal dynamics of methane emissions in fully saturated wetland sites, at the same time as reproducing the annual mean emissions. We find that a more complex scheme used in recent Earth system models does not add predictive power. The sites used span a range of climatic conditions, with the majority in high latitudes. The difference in apparent temperature sensitivity seasonally versus spatially cannot be recreated by the non-microbial schemes tested. We therefore conclude that microbial dynamics are a strong candidate to be driving the seasonal cycle of wetland methane emissions. We quantify longer-term temperature sensitivity using this scheme and show that it gives approximately a 12% increase in emissions per degree of warming globally. This is in addition to any hydrological changes, which could also impact future methane emissions.

Bidragsytere

Sarah E. Chadburn

  • Tilknyttet:
    Forfatter
    ved University of Exeter

Tuula Aalto

  • Tilknyttet:
    Forfatter
    ved Ilmatieteen laitos

Mika Aurela

  • Tilknyttet:
    Forfatter
    ved Ilmatieteen laitos

Dennis Baldocchi

  • Tilknyttet:
    Forfatter
    ved University of California, Berkeley

Christina Biasi

  • Tilknyttet:
    Forfatter
    ved Itä-Suomen Yliopisto
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