Thermal sensitivity of CO2 and CH4 emissions varies with streambed sediment properties

Sophie A. Comer-warner, Paul Romeijn, Daren C. Gooddy, Sami Ullah, Nicholas Kettridge, Benjamin Marchant, David M. Hannah, Stefan Krause

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
135 Downloads (Pure)

Abstract

Globally, rivers and streams are important sources of carbon dioxide and methane, with small rivers contributing disproportionately relative to their size. Previous research on greenhouse gas (GHG) emissions from surface water lacks mechanistic understanding of contributions from streambed sediments. We hypothesise that streambeds, as known biogeochemical hotspots, significantly contribute to the production of GHGs. With global climate change, there is a pressing need to understand how increasing streambed temperatures will affect current and future GHG production. Current global estimates assume linear relationships between temperature and GHG emissions from surface water. Here we show non-linearity and threshold responses of streambed GHG production to warming. We reveal that temperature sensitivity varies with substrate (of variable grain size), organic matter (OM) content and geological origin. Our results confirm that streambeds, with their non-linear response to projected warming, are integral to estimating freshwater ecosystem contributions to current and future global GHG emissions.
Original languageEnglish
Article number2803
JournalNature Communications
Volume9
Issue number1
DOIs
Publication statusPublished - 18 Jul 2018

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