Potential methane emission from north‐temperate lakes following ice melt

Michmerhuizen, Catherine M.; Striegl, Robert G.; McDonald, Michael E.

doi:10.4319/lo.1996.41.5.0985

Cited by 162 publications

(201 citation statements)

References 27 publications

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“…Methanotrophs consume 17 % of this dissolved CH 4 during the spring and summer periods. Michmerhuizen et al (1996) found that an insignificant portion of CH 4 dissolved in Minnesota and Wisconsin lakes is oxidized during spring ice melt. If we similarly assumed no methanotrophy during the spring ice-melt periods in the model, spring diffusion emissions would increase by a factor of 2.8 and total atmospheric emissions during the study period would increase by 4.3 %.…”

Section: A4 Methane Emissions During Spring Meltmentioning

confidence: 99%

“…The CH 4 content of bubbles decreases as they are encapsulated, which suggests CH 4 dissolution into the water column (Walter et al, 2008). Dissolved CH 4 accumulates in many lakes during the ice-cover period due to the slowdown or inactivity of methanotrophs in the cold, often anoxic water column (Michmerhuizen et al, 1996;Phelps et al, 1998;Boereboom et al, 2012), so dissolved CH 4 from bubbles may not be immediately subject to oxidation. However, it can potentially be oxidized when oxygen is reintroduced during spring ice melt.…”

Section: Introductionmentioning

confidence: 99%

“…Previously, Sasaki et al (2009) measured the CH 4 concentration of bubbles trapped within lake ice in Antarctica and used aerial imaging to estimate the total volume of gas trapped before the ice melts. Elsewhere, others have measured dissolved CH 4 concentrations beneath winter lake ice or the CH 4 diffusion rate following ice-off to estimate net springtime emissions (e.g., Michmerhuizen et al, 1996;Phelps et al, 1998;Smith and Lewis, 1992).…”

Section: Introductionmentioning

confidence: 99%

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Modeling the impediment of methane ebullition bubbles by seasonal lake ice

et al. 2014

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Abstract. Microbial methane (CH 4 ) ebullition (bubbling) from anoxic lake sediments comprises a globally significant flux to the atmosphere, but ebullition bubbles in temperate and polar lakes can be trapped by winter ice cover and later released during spring thaw. This "ice-bubble storage" (IBS) constitutes a novel mode of CH 4 emission. Before bubbles are encapsulated by downward-growing ice, some of their CH 4 dissolves into the lake water, where it may be subject to oxidation. We present field characterization and a model of the annual CH 4 cycle in Goldstream Lake, a thermokarst (thaw) lake in interior Alaska. We find that summertime ebullition dominates annual CH 4 emissions to the atmosphere. Eighty percent of CH 4 in bubbles trapped by ice dissolves into the lake water column in winter, and about half of that is oxidized. The ice growth rate and the magnitude of the CH 4 ebullition flux are important controlling factors of bubble dissolution. Seven percent of annual ebullition CH 4 is trapped as IBS and later emitted as ice melts. In a future warmer climate, there will likely be less seasonal ice cover, less IBS, less CH 4 dissolution from trapped bubbles, and greater CH 4 emissions from northern lakes.

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Section: A4 Methane Emissions During Spring Meltmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling the impediment of methane ebullition bubbles by seasonal lake ice

et al. 2014

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“…Accurately placing freshwaters in the global CH 4 budget requires a better understanding of the controls and contributions of CH 4 from different sources [2][3][4][5] . In this regard, the surface waters of lakes and rivers are systematically supersaturated with CH 4 , and it has been traditionally assumed that this CH 4 is derived from anoxic environments, via vertical and lateral transport from profundal and littoral sediments 3,[6][7][8] . This assumption certainly holds for small, shallow ecosystems where the surface layers are in relatively close contact with sediments.…”

mentioning

confidence: 99%

“…M ethane (CH 4 ) emissions currently contribute B20% to the planet's greenhouse effect, with a large, but poorly defined, fraction derived from freshwater ecosystems [1][2][3][4] . Accurately placing freshwaters in the global CH 4 budget requires a better understanding of the controls and contributions of CH 4 from different sources [2][3][4][5] .…”

mentioning

confidence: 99%

Oxic water column methanogenesis as a major component of aquatic CH4 fluxes

et al. 2014

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Methanogenesis has traditionally been assumed to occur only in anoxic environments, yet there is mounting, albeit indirect, evidence of methane (CH 4 ) production in oxic marine and freshwaters. Here we present the first direct, ecosystem-scale demonstration of methanogenesis in oxic lake waters. This methanogenesis appears to be driven by acetoclastic production, and is closely linked to algal dynamics. We show that oxic water methanogenesis is a significant component of the overall CH 4 budget in a small, shallow lake, and provide evidence that this pathway may be the main CH 4 source in large, deep lakes and open oceans. Our results challenge the current global understanding of aquatic CH 4 dynamics, and suggest a hitherto unestablished link between pelagic CH 4 emissions and surface-water primary production. This link may be particularly sensitive to widespread and increasing human influences on aquatic ecosystem primary productivity.

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Carbon release from boreal peatland open water pools: Implication for the contemporary C exchange

et al. 2014

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While peatland ecosystems overall are long-term net carbon (C) sinks, the open water pools that are characteristic of boreal peatlands have been found to be C sources to the atmosphere. However, the contribution of these pools to the ecosystem level C budget is often ignored even if they cover a significant area of the peatland surface. Here we examine the annual CO 2 and CH 4 ecosystem-atmosphere exchange, including the release following ice melt, from pools in a boreal maritime peatland, in order to estimate the annual loss of C from these water bodies. Over a 16 month period, dissolved CO 2 and CH 4 were measured periodically in five pools while continuous measurements of CO 2 were made in one pool using a nondispersive infrared (NDIR) sensor. Fluxes were calculated using the thin boundary layer model and the eddy covariance technique (spring release only). We calculated an annual C release from pools of 103.3 g C m À2 yr À1 of which 15% was released during the spring ice melt. This release is the same order of magnitude, but with the opposite sign, as the average net ecosystem carbon balance for pool-free northern peatlands (À22 to À70 g C m À2 yr À1). We discuss the origin of the released C, as the magnitude of the release could have a significant impact on the contemporary C exchange of boreal peatlands.

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Potential methane emission from north‐temperate lakes following ice melt

Cited by 162 publications

References 27 publications

Modeling the impediment of methane ebullition bubbles by seasonal lake ice

Modeling the impediment of methane ebullition bubbles by seasonal lake ice

Oxic water column methanogenesis as a major component of aquatic CH4 fluxes

Carbon release from boreal peatland open water pools: Implication for the contemporary C exchange

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