Oxygen Ebullition From Lakes

Koschorreck, Matthias; Hentschel, I.; Boehrer, Bertram

doi:10.1002/2017gl074591

Cited by 26 publications

(36 citation statements)

References 34 publications

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“…Delwiche & Hemond, ) and typically cannot yet be parameterized. However, ebullition has been measured to be a major gas efflux pathway relative to diffusive exchange in some shallow aquatic settings for biologically generated gases including nitrogen (N 2 ; ebullition flux in a pond similar to diffusive fluxes in other settings; Gao et al, ), CH 4 and CO 2 (ebullition 95–97% of CH 4 and 13–35% of CO 2 net fluxes in a rice paddy; Komiya et al, ), and O 2 (10–22% of net fluxes in a lake and reservoir; Koschorreck et al, ).…”

Section: Introductionmentioning

confidence: 99%

Using Noble Gases to Compare Parameterizations of Air‐Water Gas Exchange and to Constrain Oxygen Losses by Ebullition in a Shallow Aquatic Environment

et al. 2018

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Accurate determination of air-water gas exchange fluxes is critically important for calculating ecosystem metabolism rates from dissolved oxygen in shallow aquatic environments. We present a unique data set of the noble gases neon, argon, krypton, and xenon in a salt marsh pond to demonstrate how the dissolved noble gases can be used to quantify gas transfer processes and evaluate gas exchange parameterizations in shallow, near-shore environments. These noble gases are sensitive to a variety of physical processes, including bubbling. We thus additionally use this data set to demonstrate how dissolved noble gases can be used to assess the contribution of bubbling from the sediments (ebullition) to gas fluxes. We find that while literature gas exchange parameterizations do well in modeling more soluble gases, ebullition must be accounted for in order to correctly calculate fluxes of the lighter noble gases. In particular, for neon and argon, the ebullition flux is larger than the differences in the diffusive gas exchange flux estimated by four different wind speed-based parameterizations for gas exchange. We present an application of noble gas derived ebullition rates to improve estimates of oxygen metabolic fluxes in this shallow pond environment. Up to 21% of daily net oxygen production by photosynthesis may be lost from the pond via ebullition during some periods of biologically and physically produced supersaturation. Ebullition could be an important flux of oxygen and other gases that is measurable with noble gases in other shallow aquatic environments.

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Section: Introductionmentioning

confidence: 99%

Using Noble Gases to Compare Parameterizations of Air‐Water Gas Exchange and to Constrain Oxygen Losses by Ebullition in a Shallow Aquatic Environment

et al. 2018

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“…Inverted funnel traps have been used to evaluate bubble ebullition and composition, primarily to investigate microbial production of methane, nitrous oxide, nitrogen, and carbon dioxide in freshwater systems (Keller and Stallard ; Casper et al ; Huttunen et al ; Varadharajan et al ; Gao et al ). More recently, these techniques have been used to investigate O 2 release from sediments and microphytobenthic communities (Cheng et al ; Koschorreck et al ). The simplest design employs an inverted funnel to capture gas, followed by manual collection and measurement of the gas volume (Odum ; Martens and Klump ; Keller and Stallard ; Cheng et al ; Koschorreck et al ).…”

mentioning

confidence: 99%

“…More recently, these techniques have been used to investigate O 2 release from sediments and microphytobenthic communities (Cheng et al ; Koschorreck et al ). The simplest design employs an inverted funnel to capture gas, followed by manual collection and measurement of the gas volume (Odum ; Martens and Klump ; Keller and Stallard ; Cheng et al ; Koschorreck et al ). These bubble traps can be easily deployed to quantify seagrass ebullition as conditions favorable for bubble formation have been identified (e.g., shallow water, high irradiance, low flow, high oxygen saturation) (Zieman ; Hargraves ).…”

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confidence: 99%

Ebullition of oxygen from seagrasses under supersaturated conditions

Long

Sutherland

Wankel

et al. 2019

Limnology & Oceanography

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Gas ebullition from aquatic systems to the atmosphere represents a potentially important fraction of primary production that goes unquantified by measurements of dissolved gas concentrations. Although gas ebullition from photosynthetic surfaces has often been observed, it is rarely quantified. The resulting underestimation of photosynthetic activity may significantly bias the determination of ecosystem trophic status and estimated rates of biogeochemical cycling from in situ measures of dissolved oxygen. Here, we quantified gas ebullition rates in Zostera marina meadows in Virginia, U.S.A. using simple funnel traps and analyzed the oxygen concentration and isotopic composition of the captured gas. Maximum hourly rates of oxygen ebullition (3.0 mmol oxygen m−2 h−1) were observed during the coincidence of high irradiance and low tides, particularly in the afternoon when oxygen and temperature maxima occurred. The daily ebullition fluxes (up to 11 mmol oxygen m−2 d−1) were roughly equivalent to net primary production rates determined from dissolved oxygen measurements indicating that bubble ebullition can represent a major component of primary production that is not commonly included in ecosystem‐scale estimates. Oxygen content comprised 20–40% of the captured bubble gas volume and correlated negatively with its δ18O values, consistent with a predominance of mixing between the higher δ18O of atmospheric oxygen in equilibrium with seawater and the lower δ18O of oxygen derived from photosynthesis. Thus, future studies interested in the metabolism of highly productive, shallow water ecosystems, and particularly those measuring in situ oxygen flux, should not ignore the bubble formation and ebullition processes described here.

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“…Hence, the ratio of the total pressure inside the measurement volume compared with the absolute pressure represents a quantification of the proximity of lake water to spontaneous ebullition (e.g. Schmid et al, 2004;Koschorreck et al, 2017).…”

Section: Total Gas Pressurementioning

confidence: 99%

Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation

Boehrer

Tümpling

Mugisha³

et al. 2019

Hydrol. Earth Syst. Sci.

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Abstract. Dissolved methane in Lake Kivu (East Africa) represents a precious energy deposit for the neighbouring countries, but the high gas loads have also been perceived as a threat by the local population. This is especially the case with respect to potential changes to the lake's stratification during planned industrial exploitation. Both of the above-mentioned issues require accurate and reliable measurements of dissolved gases and temporal changes to take responsible action. Previous data were unable to satisfactorily fulfil these requirements. Prior to our measurements, there was considerable disagreement about prognosticated new formation of methane. We show how measurement accuracy could be significantly improved by implementing equipment that is especially designed and modified for the complex gas conditions in Lake Kivu. Samples were taken from depths of 150 to 430 m to more reliably and more accurately determine the amount of dissolved methane and dissolved carbon dioxide. Beyond the provision of gas concentration profiles at the beginning of exploitation, this investigation can also potentially provide methods to survey the further evolution of gases over time. The use of gas-tight sampling bags produced highly reliable and accurate measurements. Our measurements confirmed the huge amount of stored methane, but clearly did not support the current belief of a significant recharge beyond diffusive loss. Direct measurements with a custom-made gas pressure sensor indicated no imminent danger due to limnic eruptions. However, a further survey of gas pressures is mandatory to detect changing conditions. Using sampling bags and a gas pressure sensor, we introduced reliable and highly accurate measurement approaches for the survey of the further development of gas concentrations. This equipment requires little effort with respect to calibration, which makes it suitable for use in the remote areas of Africa.

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Oxygen Ebullition From Lakes

Cited by 26 publications

References 34 publications

Using Noble Gases to Compare Parameterizations of Air‐Water Gas Exchange and to Constrain Oxygen Losses by Ebullition in a Shallow Aquatic Environment

Using Noble Gases to Compare Parameterizations of Air‐Water Gas Exchange and to Constrain Oxygen Losses by Ebullition in a Shallow Aquatic Environment

Ebullition of oxygen from seagrasses under supersaturated conditions

Reliable reference for the methane concentrations in Lake Kivu at the beginning of industrial exploitation

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