Modeling the impediment of methane ebullition bubbles by seasonal lake ice

Greene, Samuel M.; Anthony, K. M. Walter; Archer, David; Sepulveda‐Jauregui, Armando; Martinez‐Cruz, Karla

doi:10.5194/bg-11-6791-2014

Cited by 77 publications

(144 citation statements)

References 65 publications

(70 reference statements)

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“…Another reason is that yedoma lakes have a significantly higher ebullition year round (Walter et al, 2007;Sepulveda-Jauregui et al, 2015). Even during winter, Greene et al (2014) found that 80 % of CH 4 in ebullition bubbles trapped under the ice cover dissolves into the lake water column before being confined within the growing ice sheet, leading to elevated dissolved CH 4 beneath the ice.…”

Section: Geographic and Seasonal Variations In Physicochemical Paramementioning

confidence: 99%

“…This seasonal variation can be attributed to thick ice covering the lakes in winter. Ice cover impedes gas exchange between the water and the atmosphere, promoting CH 4 build-up in the water column (Phelps et al, 1998;Bastviken et al, 2004;Juutinen et al, 2009) and hindering O 2 transfer from the atmosphere, except in some locations where high-flux ebullition seeps allow gas exchange through local holes in lake ice (Greene et al, 2014). Ice and snow also reduce light penetration and oxygen production by photosynthesis beneath the ice (White et al, 2008;Clilverd et al, 2009).…”

Section: Geographic and Seasonal Variations In Physicochemical Paramementioning

confidence: 99%

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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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Section: Geographic and Seasonal Variations In Physicochemical Paramementioning

confidence: 99%

Section: Geographic and Seasonal Variations In Physicochemical Paramementioning

confidence: 99%

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

et al. 2015

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“…Previous studies have documented significantly earlier ice breakup between the 1950s and 2000s for lakes in Canada (Duguay et al, 2006;Latifovic and Pouliot, 2007;Prowse et al, 2011) and decreasing ice cover duration of Eurasia lakes during the last few decades (Vuglinsky and Gronskaya, 2006;Karetnikov and Naumenko, 2008;Prowse et al, 2011). Shorter ice cover seasons may promote greater CH 4 emissions from northern lakes (Greene et al, 2014), which could reinforce further climate warming due to the role of CH 4 as a potent greenhouse gas. Despite a general tendency for later freezing and earlier breakup in the Northern Hemisphere , various tendencies including earlier ice formation and later ice breakup over specific lakes and time periods may exist.…”

Section: Introductionmentioning

confidence: 99%

Satellite microwave assessment of Northern Hemisphere lake ice phenology from 2002 to 2015

Kimball

Duguay

et al. 2017

The Cryosphere

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Abstract.A new automated method enabling consistent satellite assessment of seasonal lake ice phenology at 5 km resolution was developed for all lake pixels (water coverage ≥ 90 %) in the Northern Hemisphere using 36.5 GHz H-polarized brightness temperature (T b ) observations from the Advanced Microwave Scanning Radiometer for EOS and Advanced Microwave Scanning Radiometer 2 (AMSR-E/2) sensors. The lake phenology metrics include seasonal timing and duration of annual ice cover. A moving t test (MTT) algorithm allows for automated lake ice retrievals with daily temporal fidelity and 5 km resolution gridding. The resulting ice phenology record shows strong agreement with available ground-based observations from the Global Lake and River Ice Phenology Database (95.4 % temporal agreement) and favorable correlations (R) with alternative ice phenology records from the Interactive Multisensor Snow and Ice Mapping System (R = 0.84 for water clear of ice (WCI) dates; R = 0.41 for complete freeze over (CFO) dates) and Canadian Ice Service (R = 0.86 for WCI dates; R = 0.69 for CFO dates). Analysis of the resulting 12-year (2002-2015) AMSR-E/2 ice record indicates increasingly shorter ice cover duration for 43 out of 71 (60.6 %) Northern Hemisphere lakes examined, with significant (p < 0.05) regional trends toward earlier ice melting for only five lakes. Higherlatitude lakes reveal more widespread and larger trends toward shorter ice cover duration than lower-latitude lakes, consistent with enhanced polar warming. This study documents a new satellite-based approach for rapid assessment and regional monitoring of seasonal ice cover changes over large lakes, with resulting accuracy suitable for global change studies.

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“…1; Walter et al, 2006;Walter Anthony et al, 2012;Sepulveda-Jauregui et al, 2015). In spring, the break-up of the ice and mixing allows stored CH 4 to be oxidized or emitted from the system through diffusion or ebullition (Juutinen et al, 2009;López Bellido et al, 2009;Karlsson et al, 2013;Greene et al, 2014;Jammet et al, 2015). Emissions of stored CH 4 during overturn events accounts for up to 40 % of the total annual flux in lakes globally (Michmerhuizen et al, 1996;Juutinen et al, 2009;López Bellido et al, 2009;Encinas Fernandez et al, 2014;Jammet et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…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. Emission by ebullition and plants results in a direct flux of CH 4 to the atmosphere with limited oxidation in the water column (Keppler et al, 2006;Walter et al, 2006Walter et al, , 2007Nisbet et al, 2009;Wik et al, 2013;Greene et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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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Modeling the impediment of methane ebullition bubbles by seasonal lake ice

Cited by 77 publications

References 65 publications

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

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

Satellite microwave assessment of Northern Hemisphere lake ice phenology from 2002 to 2015

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

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