High Spatiotemporal Dynamics of Methane Production and Emission in Oxic Surface Water

Hartmann, Jan; Günthel, Marco; Klintzsch, Thomas; Kirillin, Georgiy; Grossart, Hans‐Peter; Keppler, Frank; Isenbeck‐Schröter, Margot

doi:10.1021/acs.est.9b03182

Cited by 57 publications

(94 citation statements)

References 74 publications

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“…Our observations allow the alternative explanation of an internal (oxic) CH 4 source with a δ 13 C signature distinctively higher than that of the anoxic CH 4 sources. This explanation is supported by our bottle incubations showing active CH 4 production under oxic conditions, and a recent study modeling CH 4 carbon isotope changes in lake water (Hartmann et al 2020).…”

Section: Discussionsupporting

confidence: 88%

“…Both species showed CH 4 production aligning with light–dark incubation periods and more CH 4 was produced at higher light intensities. Combining ours and others' findings (Bizic et al 2020; Hartmann et al 2020), the results suggest that light‐triggered CH 4 production may be common among phytoplankton. It is likely that the conversion of NaH 13 CO 3 to CH 4 involves multiple steps, not all being light‐dependent (decreased but active CH 4 production during dark phases: Bizic et al 2020; Fig.…”

Section: Discussionsupporting

confidence: 87%

“…For example, Grossart et al (2011) reported about seven times higher oxic CH 4 production rate in an earlier year based on bottle incubations. Günthel et al (2019) and Hartmann et al (2020), using mass balance analysis of CH 4 production and loss, arrived at oxic CH 4 production rates of up to > 200 nmol L −1 d −1 . Therefore, our oxic CH 4 production rates should be considered conservative, which potentially explained 18% of the observed average surface flux.…”

Section: Discussionmentioning

confidence: 99%

“…Currently, there are two proposed pathways for oxic‐lake water CH 4 production: (1) Methane as a by‐product of methylphosphonate (MPN) decomposition, which is an alternative way of phosphorus acquisition when inorganic phosphorus is limited (Carini et al 2014; Yao et al 2016; Wang et al 2017); and (2) a pathway independent of MPN demethylation which is thought to be based on a Coenzyme‐M homologue (Tang et al 2016). Several studies have demonstrated the involvement of photoautotrophs in CH 4 formation in oxic water, both in the field (Grossart et al 2011; Bogard et al 2014; Hartmann et al 2020) and in the laboratory (Lenhart et al 2016; Klintzsch et al 2019; Bizic et al 2020; Hartmann et al 2020). The association of oxic CH 4 production to MPN degradation and autotrophic organisms suggests that phosphorus and light might be important factors driving oxic CH 4 production.…”

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confidence: 99%

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Photosynthesis‐driven methane production in oxic lake water as an important contributor to methane emission

Günthel

Klawonn

Woodhouse

et al. 2020

Limnology & Oceanography

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Recent discovery of methane (CH4) production in oxic waters challenges the conventional understanding of strict anoxic requirement for biological CH4 production. High‐resolution field measurements in Lake Stechlin, as well as incubation experiments, suggested that oxic‐water CH4 production occurred throughout much of the water column and was associated with phytoplankton especially diatoms, cyanobacteria, green algae, and cryptophytes. In situ concentrations and δ13C values of CH4 in oxic water were negatively correlated with soluble reactive phosphorus concentrations. Using 13C‐labeling techniques, we showed that bicarbonate was converted to CH4, and the production exceeded oxidation at day, but was comparable at night. These experimental data, along with complementary field observations, indicate a clear link between photosynthesis and the CH4 production‐consumption balance in phosphorus‐limited epilimnic waters. Comparison between surface CH4 emission data and experimental CH4 production rates suggested that the oxic CH4 source significantly contributed to surface emission in Lake Stechlin. These findings call for re‐examination of the aquatic CH4 cycle and climate predictions.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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Photosynthesis‐driven methane production in oxic lake water as an important contributor to methane emission

Günthel

Klawonn

Woodhouse

et al. 2020

Limnology & Oceanography

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“…The rise and fall of lake CH 4 concentration often show strong seasonality that are driven primarily by thermal stratification (Encinas Fernández et al, 2014) and phytoplankton dynamics (Günthel et al, 2019). While the build-up of hypolimnetic CH storage is a slow process that is closely related to the development of lake hypoxia, the epilimnetic CH 4 maximum can be highly variable even at a daily basis as it is strongly affected by phytoplankton dynamics (Günthel et al, 2019;Hartmann et al, 2020;Bižić et al, 2020). In addition, storms can act as another driver for short-term CH 4 dynamics in the lake because it often leads to higher evasion rates caused by strong vertical turbulent mixing (Zimmermann et al, 2019) and enhanced horizontal transport (Fernández et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

A Fast-response automated gas equilibrator (FaRAGE) for continuous in situ measurement of methane dissolved in water

Xiao¹,

Liu²,

Wang³

et al. 2020

Preprint

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Abstract. Biogenic methane (CH4) emissions from inland waters contribute substantially to global warming. In aquatic systems, CH4 dissolved in freshwater lakes and reservoirs is highly heterogeneous both in space and time. To better understand the biological and physical processes that affect sources and sinks of CH4 in lakes and reservoirs, dissolved CH4 needs to be measured with a highest temporal resolution. To achieve this goal, we developed the Fast-Response Automated Gas Equilibrator (FaRAGE) for real-time in situ measurement of dissolved CH4 concentration at the water surface and in the water column. FaRAGE can achieve an exceptionally short response time (t95 % = 12 s when including the response time of the gas analyzer) while retaining an equilibration ratio of 63 % and a measurement accuracy of 0.5 %. An equilibration ratio as high as 91.8 % can be reached at the cost of a slightly increased response time (16 s). The FaRAGE is capable of continuously measuring dissolved CH4 concentrations in the nM-to-mM (10−9–10−3 mol L−1) range with a detection limit of sub-nM (10−10 mol L−1), when coupled with a cavity ring-down greenhouse gas analyzer (Picarro GasScouter). It enables the possibility of mapping dissolved CH4 concentration in a quasi three-dimensional manner in lakes. The FaRAGE is simple to operate, inexpensive, and suitable for continuous monitoring with a strong tolerance to suspended particles. The easy adaptability to other gas analyzers such as Ultra-portable Los Gatos and stable isotopic gas analyzer (Picarro G2132-i) also provides the potential for many further applications, e.g. measuring dissolved 13δC-CH4 and CO2.

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The impact of seasonal sulfate–methane transition zones on methane cycling in a sulfate‐enriched freshwater environment

Kleint

Wellach

Schroll

et al. 2021

Limnology & Oceanography

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Lake Willersinnweiher located in south-western Germany is a small eutrophic gravel pit lake fed by sulfateenriched groundwater. The aim of this study was to investigate the total methane (CH 4 ) mass balance of Lake Willersinnweiher with a particular focus on the interaction of carbon and sulfur cycling within the lake sediments and the redoxcline of the water column. Our results show that Lake Willersinnweiher permanently releases CH 4 to the atmosphere throughout the whole year 2018 at rates ranging from 5 to 120 mol d −1 . Sediment data show the presence of intense anaerobic oxidation of CH 4 in the upper sediment layers during early summer. Here, CH 4 is most likely consumed via sulfate in sulfate-methane transition zones (SMTZs) that have been observed for a few specific freshwater environments only. Seasonal dynamics in biogeochemical processes trigger the non-steady state conditions within the sediments and the CH 4 consumption in the SMTZs. In parallel, CH 4 released from the sediments is completely consumed by aerobic oxidation processes in the redoxcline indicated by minimum CH 4 concentrations with high δ 13 C-CH 4 values. This zone acts as an effective barrier, minimizing CH 4 release into the surface water and the atmosphere and thus CH 4 oversaturation along with near-atmospheric isotopic composition indicate the presence of an additional CH 4 source in the epilimnion of Lake Willersinnweiher.The emission of the greenhouse gas methane (CH 4 ) from freshwater lakes has been suggested to play a substantial role in the global methane budget (e.g., Bastviken et al. 2004). Here, significant amounts of CH 4 are emitted, even though CH 4 produced in aquatic systems is largely consumed by anaerobic and aerobic methanotrophs (up to 30-99%; Bastviken et al. 2008). The amount of emitted CH 4 is thereby depending on bioproduction, degradation and mineralization of organic substances in the sediments and the water column of the freshwater lake.Carbon mineralization in anoxic lake sediments is affected by manganese (Mn) and iron (Fe) reducing bacteria metabolizing competitive substrates, outcompeting CH 4 forming microorganisms (methanogens) within the upper sediment layers (e.g., Whiticar 1999). Sulfate (SO 4 2− ) reduction often has minor implications on organic matter degradation due to low SO 4 2− availability in most freshwater environments (Holmer and Storkholm 2001), so that SO 4 2− is rapidly depleted with sediment depth and SO 4 2− reducing bacteria become inactive or are absent. As a consequence, methanogenesis is the most important process in overall carbon mineralization in anoxic lacustrine sediments (e.g., Rudd and Hamilton 1978). Competitive metabolisms are not only affecting methanogenesis, but also consumption of CH 4 by bacteria (methanotrophs) in the sediments. The anaerobic oxidation of methane in the sediments of lakes is usually coupled to the reduction of the energetically more favorable electron acceptors, such as nitrate and nitrite (e.g., Raghoebarsing et al. 2006) or Fe(III) and/or Mn(I...

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High Spatiotemporal Dynamics of Methane Production and Emission in Oxic Surface Water

Cited by 57 publications

References 74 publications

Photosynthesis‐driven methane production in oxic lake water as an important contributor to methane emission

Photosynthesis‐driven methane production in oxic lake water as an important contributor to methane emission

A Fast-response automated gas equilibrator (FaRAGE) for continuous in situ measurement of methane dissolved in water

The impact of seasonal sulfate–methane transition zones on methane cycling in a sulfate‐enriched freshwater environment

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