Quantifying rates of methanogenesis and methanotrophy in Lake Kinneret sediments (Israel) using pore‐water profiles

Adler, M.; Eckert, Werner; Sivan, Orit

doi:10.4319/lo.2011.56.4.1525

Cited by 46 publications

(64 citation statements)

References 49 publications

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“…), but they are still a factor two to three below the flux estimated by the optimized model. Furthermore, the contribution of ebullition to the total fluxes from the sediments during anoxic conditions in the hypolimnion (∼80%) exceeds a previous estimate of 50–75% based on CH 4 budgets within sediment cores (Adler et al ).…”

Section: Discussioncontrasting

confidence: 51%

Role of gas ebullition in the methane budget of a deep subtropical lake: What can we learn from process‐based modeling?

Schmid

Ostrovsky

Mcginnis

2017

Limnology & Oceanography

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We analyzed the processes affecting the methane (CH 4 ) budget in Lake Kinneret, a deep subtropical lake, using a suite of three models: (1) a bubble model to determine the fate of CH 4 bubbles released from the sediment; (2) the one-dimensional physical lake model Simstrat to calculate the mixing dynamics; and (3) a biogeochemical model implemented in Aquasim to quantify the CH 4 sources and sinks. The key pathways modeled include diffusive and bubble release of CH 4 from the sediment, aerobic CH 4 oxidation, and atmospheric gas exchange. The temporal and spatial dynamics of dissolved CH 4 concentrations observed in the lake during 3 years could be well represented by the combined models. Remarkably, the relative contributions of ebullition and diffusive transport to the accumulation of CH 4 in the hypolimnion during the stratified period could not be accurately constrained based only on the observed evolution of CH 4 concentrations in the water column. Importantly, however, our analysis showed that most ($99%) of the CH 4 supplied to the water column by bubble dissolution and diffusive transport from the sediment is aerobically oxidized, whereas a substantial fraction ($60%) of the sediment-released bubble CH 4 is directly transported to the atmosphere. Ebullition is thus responsible for the bulk of the emissions from Lake Kinneret to the atmosphere. Therefore, as in all freshwaters, ebullition quantification is crucial for accurately assessing CH 4 emissions to the atmosphere. This task remains challenging due to high spatio-temporal variability, but combining in situ measurements with a process-based modeling can help to better constrain flux estimates.

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Section: Discussioncontrasting

confidence: 51%

Role of gas ebullition in the methane budget of a deep subtropical lake: What can we learn from process‐based modeling?

Schmid

Ostrovsky

Mcginnis

2017

Limnology & Oceanography

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“…One milliliter headspace sample was taken from the crimped vial with a gas‐tight pressure lock after the bottle was shaken vigorously. CH 4 in the headspace was measured on a Focus Gas Chromatograph (Thermo) with ShinCarbon column with precision of 2 μM L −1 (Adler et al ., ).…”

Section: Methodsmentioning

confidence: 99%

Hydrocarbon-related microbial processes in the deep sediments of the Eastern Mediterranean Levantine Basin

Rubin‐Blum

Antler

Turchyn

et al. 2013

FEMS Microbiol Ecol

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During the 2011 exploration season of the EV Nautilus in the Mediterranean Sea, we conducted a multidisciplinary study, aimed at exploring the microbial populations below the sediment-water interface (SWI) in the hydrocarbon-rich environments of the Levantine basin. Two c. 1000-m-deep locations were sampled: sediments fueled by methane seepage at the toe of the Palmachim disturbance and a patch of euxinic sediment with high sulfide and methane content offshore Acre, enriched by hydrocarbon from an unknown source. We describe the composition of the microbial population in the top 5 cm of the sediment with 1 cm resolution, accompanied by measurements of methane and sulfate concentrations, and the isotopic composition of this methane and sulfate (δ¹³C(CH₄), δ¹⁸O(SO₄), and δ³⁴S(SO₄)). Our geochemical and microbiological results indicate the presence of the anaerobic methane oxidation (AOM) coupled to bacterial sulfate reduction (BSR). We show that complex methane and sulfur metabolizing microbial populations are present in both locations, although their community structure and metabolic preferences differ due to potential variation in the hydrocarbon source.

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“…Apart from the insights discussed above, the knowledge about free gas within the sediment of LK is rather limited. Adler et al () found bubbles between 7 and 15 cm depth into the sediment at the deepest part of the lake by visual inspection of sediment cores. The decreasing hydrostatic pressure during core recovery can result in the formation of new gas bubbles due to dissolution of CH 4 in the sediment pore water and an expansion of existing bubbles, resulting in a possible bias of this study.…”

Section: Assessmentmentioning

confidence: 99%

A novel freeze corer for characterization of methane bubbles and assessment of coring disturbances

Dück

Liu

Lorke

et al. 2019

Limnology & Ocean Methods

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Aquatic ecosystems with organic‐rich sediments are a globally significant source of methane to the atmosphere. In shallow waters, ebullition is often a dominant emission pathway of methane. Current knowledge on the processes controlling gas bubble formation and persistence in aquatic sediments is limited. An important prerequisite for accurate quantification of the structure and methane bubbles in sediment samples is to preserve the ambient in situ conditions during the withdrawal process and further analysis. A novel freeze corer has been developed that facilitates sampling of gas‐bearing soft sediments for X‐ray computer tomography. The sampler allows freezing sediment inside a double‐walled corer with a mixture of dry ice and ethanol. This corer has moderate costs and offers important advantages for gassy sediment sampling. Its simplicity and robustness allow to perform sampling from a small boat and the ability to characterize in situ sediment features. The applicability of this freeze coring technique for gas bubble quantification was validated during laboratory experiments aimed to investigate the effects of freezing on sediment gas content, bubble size distribution, and their geometry by comparing computer tomography scans of unfrozen vs. frozen cores. The performance of the corer was further evaluated during field conditions in Lake Kinneret (the Sea of Galilee, Israel). The results demonstrate the suitability of the freeze‐coring method for in situ preservation of gas‐bearing sediments. The sediment structure, however, showed some displacements of sediments layers and bubble abundance in some core regions. Future investigations are needed to address the nature of disturbances of the frozen sediment.

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Quantifying rates of methanogenesis and methanotrophy in Lake Kinneret sediments (Israel) using pore‐water profiles

Cited by 46 publications

References 49 publications

Role of gas ebullition in the methane budget of a deep subtropical lake: What can we learn from process‐based modeling?

Role of gas ebullition in the methane budget of a deep subtropical lake: What can we learn from process‐based modeling?

Hydrocarbon-related microbial processes in the deep sediments of the Eastern Mediterranean Levantine Basin

A novel freeze corer for characterization of methane bubbles and assessment of coring disturbances

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