Dynamics of microbial oxidation of methane in the water of stratified lakes

Dzyuban, A. N.

doi:10.1134/s0026261710060159

Cited by 8 publications

(11 citation statements)

References 2 publications

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“…When CH 4 diffusing from anoxic sediments reaches oxic sediment or water, the majority of it is oxidized (Bastviken et al, 2002;Dzyuban, 2010;Kankaala et al, 2007). MOx is highly efficient at consuming CH 4 , thereby lowering CH 4 concentrations.…”

Section: Effects Of Stratification On Chmentioning

confidence: 99%

“…8). Both the highest and lowest CH 4 concentrations are observed in waters < 5 • C. In freshwater environments, the concentration of dissolved CH 4 reflects the balance between CH 4 production and CH 4 consumption by anaerobic or aerobic oxidation (Duc et al, 2010;Dzyuban, 2010;Encinas Fernandez et al, 2014;Kankaala et al, 2007;Martinez-Cruz et al, 2015;Segarra et al, 2015;Smemo and Yavitt, 2011). Methane production is affected by temperature, where higher temperatures result in increased production (Duc et al, 2010).…”

Section: Effects Of Temperature On Chmentioning

confidence: 99%

“…Microbial production of CH 4 by methanogens is dependent upon anoxia, temperature, and the amount and quality of organic carbon substrates (Liikanen et al, 2003;Kankaala et al, 2006;Duc et al, 2010;Borrel et al, 2011). A large proportion of the CH 4 produced in lakes is consumed by aerobic or anaerobic oxidation (Frenzel et al, 1990;Bastviken et al, 2002;Kankaala et al, 2007;Dzyuban, 2010;Martinez-Cruz et al, 2015). Aerobic microbial oxidation of methane (MOx) depends on the availability of both CH 4 and O 2 , wherein higher MOx rates are usually found at the oxic-anoxic interface, where both CH 4 and O 2 are present in high concentrations (Bastviken et al, 2002;Dzyuban, 2010).…”

Section: Introductionmentioning

confidence: 99%

“…A large proportion of the CH 4 produced in lakes is consumed by aerobic or anaerobic oxidation (Frenzel et al, 1990;Bastviken et al, 2002;Kankaala et al, 2007;Dzyuban, 2010;Martinez-Cruz et al, 2015). Aerobic microbial oxidation of methane (MOx) depends on the availability of both CH 4 and O 2 , wherein higher MOx rates are usually found at the oxic-anoxic interface, where both CH 4 and O 2 are present in high concentrations (Bastviken et al, 2002;Dzyuban, 2010). Excess CH 4 that escapes MOx and reaches the upper mixed layer of the water column (epilimnion) is available for emission to the atmosphere by molecular diffusion under open-water conditions.…”

Section: Introductionmentioning

confidence: 99%

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Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

2017

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Abstract. In thermally stratified lakes, the greatest annual methane emissions typically occur during thermal overturn events. In July of 2012, Greenland experienced significant warming that resulted in substantial melting of the Greenland Ice Sheet and enhanced runoff events. This unusual climate phenomenon provided an opportunity to examine the effects of short-term natural heating on lake thermal structure and methane dynamics and compare these observations with those from the following year, when temperatures were normal. Here, we focus on methane concentrations within the water column of five adjacent small lakes on the icefree margin of southwestern Greenland under open-water and ice-covered conditions from 2012-2014. Enhanced warming of the epilimnion in the lakes under open-water conditions in 2012 led to strong thermal stability and the development of anoxic hypolimnia in each of the lakes. As a result, during open-water conditions, mean dissolved methane concentrations in the water column were significantly (p < 0.0001) greater in 2012 than in 2013. In all of the lakes, mean methane concentrations under ice-covered conditions were significantly (p < 0.0001) greater than under open-water conditions, suggesting spring overturn is currently the largest annual methane flux to the atmosphere. As the climate continues to warm, shorter ice cover durations are expected, which may reduce the winter inventory of methane and lead to a decrease in total methane flux during ice melt. Under openwater conditions, greater heat income and warming of lake surface waters will lead to increased thermal stratification and hypolimnetic anoxia, which will consequently result in increased water column inventories of methane. This stored methane will be susceptible to emissions during fall overturn, which may result in a shift in greatest annual efflux of methane from spring melt to fall overturn. The results of this study suggest that interannual variation in ground-level air temperatures may be the primary driver of changes in methane dynamics because it controls both the duration of ice cover and the strength of thermal stratification.

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Section: Effects Of Stratification On Chmentioning

confidence: 99%

Section: Effects Of Temperature On Chmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

2017

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“…1). Among these, the most important are methanogenesis producing CH 4 , primary production and atmospheric diffusion supplying O 2 , and several aerobic metabolic processes that compete with MO for available O 2 (Dzyuban, 2010).…”

Section: Introductionmentioning

confidence: 99%

Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

et al. 2015

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Abstract. Methanotrophic bacteria play an important role oxidizing a significant fraction of methane (CH 4 ) produced in lakes. Aerobic CH 4 oxidation depends mainly on lake CH 4 and oxygen (O 2 ) concentrations, in such a manner that higher MO rates are usually found at the oxic/anoxic interface, where both molecules are present. MO also depends on temperature, and via methanogenesis, on organic carbon input to lakes, including from thawing permafrost in thermokarst (thaw)-affected lakes. Given the large variability in these environmental factors, CH 4 oxidation is expected to be subject to large seasonal and geographic variations, which have been scarcely reported in the literature. In the present study, we measured CH 4 oxidation rates in 30 Alaskan lakes along a north-south latitudinal transect during winter and summer with a new field laser spectroscopy method. Additionally, we measured dissolved CH 4 and O 2 concentrations. We found that in the winter, aerobic CH 4 oxidation was mainly controlled by the dissolved O 2 concentration, while in the summer it was controlled primarily by the CH 4 concentration, which was scarce compared to dissolved O 2 . The permafrost environment of the lakes was identified as another key factor. Thermokarst (thaw) lakes formed in yedoma-type permafrost had significantly higher CH 4 oxidation rates compared to other thermokarst and non-thermokarst lakes formed in non-yedoma permafrost environments. As thermokarst lakes formed in yedoma-type permafrost have been identified to receive large quantities of terrestrial organic carbon from thaw and subsidence of the surrounding landscape into the lake, confirming the strong coupling between terrestrial and aquatic habitats and its influence on CH 4 cycling.

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Emissions of greenhouse gases from Lake Neusiedl, a shallow steppe lake in Eastern Austria

Soja

Kitzler²,

Soja

2013

Hydrobiologia

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Dynamics of microbial oxidation of methane in the water of stratified lakes

Cited by 8 publications

References 2 publications

Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

Exceptional summer warming leads to contrasting outcomes for methane cycling in small Arctic lakes of Greenland

Geographic and seasonal variation of dissolved methane and aerobic methane oxidation in Alaskan lakes

Emissions of greenhouse gases from Lake Neusiedl, a shallow steppe lake in Eastern Austria

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