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

Nature Communications
Sophie A Comer-WarnerStefan Krause

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.

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Citations

Nov 28, 2019·Nature Communications·Scott D Tiegs, Thomas Raffel
Nov 28, 2019·Nature Communications·Sophie A Comer-WarnerStefan Krause
Jul 1, 2019·The Science of the Total Environment·Sophie A Comer-WarnerStefan Krause
Aug 12, 2020·Journal of Environmental Management·Morvarid Khazraee ZamanpourKarl John Rockne
Feb 6, 2020·The Science of the Total Environment·Jorge A VillaGil Bohrer
Mar 24, 2021·Environmental Science & Technology·Paul RomeijnStefan Krause
Jun 15, 2019·Water Research·John J WeatherillMichael O Rivett
Jan 30, 2019·Environmental Science & Technology·Paul RomeijnStefan Krause
Feb 14, 2019·Environmental Science & Technology·Anna JaegerJoerg Lewandowski
Sep 10, 2021·FEMS Microbiology Ecology·Ryan M BurrowsMark J Kennard

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