How does elevated ozone reduce methane emissions from peatlands?

Toet, Sylvia; Oliver, Viktoria; Ineson, Phil; McLoughlin, Sophie; Helgason, Thorunn; Peacock, Simon M.; Stott, Andrew; Barnes, Jeremy; Ashmore, Mike

doi:10.1016/j.scitotenv.2016.10.188

Cited by 9 publications

(4 citation statements)

References 68 publications

(85 reference statements)

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“…We performed this study on a mid-latitude peatland ecosystem, which is managed with the goal of bringing it back to a natural or at least semi-natural state. While most studies on ozone deposition to peat-and wetlands have been conducted using mesocosm and microcosm experiments [26][27][28][29], only few studies have considered the larger picture and deal with ozone deposition to these ecosystems as a whole [30][31][32][33]. To our knowledge, there is only one study on ozone deposition to a mid-latitude peatland on the ecosystem scale [21]; thus, here we aim to add valuable information that can improve the characterization of ozone deposition to these ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Stomatal and Non-Stomatal Turbulent Deposition Flux of Ozone to a Managed Peatland

2017

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Abstract:Ozone is a key trace gas in the troposphere; because it is a greenhouse gas, it is very reactive, and it is potentially toxic to humans, fauna, and vegetation. The main sink processes for ozone are chemical reactions and the turbulent deposition flux to the earth's surface. The deposition process itself is rather complex: The interactions between co-varying drivers such as the tropospheric ozone concentration, turbulence, and chemical reactions are not well understood. In the case of ozone deposition to vegetation, another aspect that must be studied is the role of stomatal regulation for a wide range of conditions. Therefore, we measured turbulent deposition fluxes of ozone with the eddy covariance technique during the peak of the growing season in 2014 over a managed, rewetted peatland in NW Germany. The deposition flux was large during the day (up to −15 nmol m −2 s −1 ) and relatively small during the night (between −1 and −2 nmol m −2 s −1 ). Flux partitioning by applying the surface resistance analogy and further analysis showed that the stomatal uptake was smaller than non-stomatal deposition. The correction of stomatal conductance with the gross primary production (GPP) improved the estimation of day-and nighttime stomatal deposition fluxes. Statistical analysis confirmed that the friction velocity (u*) was the single most important driver of non-stomatal ozone deposition and that relationships with other environmental drivers are not linear and highly variable. Further research is needed to develop a better process understanding of non-stomatal ozone deposition, to quantify the role of surface deposition to the ozone budget of the atmospheric boundary layer, and to estimate uncertainties associated with the partitioning of ozone deposition into stomatal and non-stomatal fluxes.

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Section: Introductionmentioning

confidence: 99%

Stomatal and Non-Stomatal Turbulent Deposition Flux of Ozone to a Managed Peatland

2017

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“…At the same time, an increasing O 3 background concentration might also cause structural and physiological plant damage (Rinnan, 2004), which could reduce C uptake by gross primary production (Oliver et al., 2018) and lower CH 4 emissions through plant‐mediated/aerenchymatous transport. Note that the effective impact of increased O 3 background concentration on CO 2 and CH 4 fluxes in peatland ecosystems has rarely been estimated and could be rather small (Haapala et al., 2011; Toet et al., 2017; Williamson et al., 2016).…”

Section: Resultsmentioning

confidence: 99%

Greenhouse Gas Exchange of a NW German Peatland, 18 Years After Rewetting

Schaller

Höfer²,

Klemm

2022

JGR Biogeosciences

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Peatlands cover only 3% of the Earth's land surface, but they store about 25% of the global carbon (C) pool (Leifeld & Menichetti, 2018;Page & Baird, 2016). They play a major role in the global biogeochemical cycles (Gorham, 1991) and the Earth's climate system, because they act as sources and sinks of greenhouse gases (GHG) such as carbon dioxide (CO 2 ), methane (CH 4 ), and nitrous oxide (N 2 O). Undisturbed, growing peatlands under natural conditions usually act as long-term C and GHG sinks, that is, following the first centuries to thousands years after initiation, the cooling effect of CO 2 sequestration outweighs the warming effect of short-lived CH 4 emissions (Frolking & Roulet, 2007;Mathijssen et al., 2017). In Europe, including the European part of Russia, still a fraction of 54% of the peatlands are undisturbed. Focusing on Germany, the fraction of peatlands that still accumulate peat (mires) is only ∼2% (Joosten et al., 2017;Tanneberger et al., 2017). The high percentage of degraded peatlands in Germany and other aeras of western Europe puts these ecosystems into the focus of global climate research. When peatlands are drained, this leads to peat oxidation and mineralization and turns peatland ecosystems from a net sink to a net source of GHG (

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“…In the past decade, many conclusions about the impacts of elvated ozone have been drawn from croplands (Bhatia et al, 2011;Decock et al, 2012;Kou et al, 2015;Tang et al, 2015;Zheng et al, 2011), peatlands (Toet et al, 2017(Toet et al, , 2011 and subalpine grasslands (Volk et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

Short-term responses of greenhouse gas emissions and ecosystem carbon fluxes to elevated ozone and N fertilization in a temperate grassland

Wang

Hayes

Chadwick

et al. 2019

Atmospheric Environment

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How does elevated ozone reduce methane emissions from peatlands?

Abstract: The NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner.

Cited by 9 publications

References 68 publications

Stomatal and Non-Stomatal Turbulent Deposition Flux of Ozone to a Managed Peatland

Stomatal and Non-Stomatal Turbulent Deposition Flux of Ozone to a Managed Peatland

Greenhouse Gas Exchange of a NW German Peatland, 18 Years After Rewetting

Short-term responses of greenhouse gas emissions and ecosystem carbon fluxes to elevated ozone and N fertilization in a temperate grassland

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