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Liikanen, Anu; Murtoniemi, Timo; Tanskanen, Heikki; Väisänen, Tero; Martikainen, Pertti J.

doi:10.1023/a:1016015526712

Cited by 153 publications

(52 citation statements)

References 31 publications

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“…4,6). This is expected, since CH 4 production and oxidation are strongly controlled by oxygen availability (Rudd et al 1976;Bastviken et al 2002;Liikanen et al 2002). CH 4 production in lakes mainly occurs in the anoxic sediment (Rudd and Hamilton 1978), and a large proportion of CH 4 is oxidized by methane oxidizing bacteria (MOB) when it is transported to the oxic sediment or into the oxic water column (Bastviken et al 2002).…”

Section: Methane Concentrations Within the Water Columnmentioning

confidence: 99%

An inter-regional assessment of concentrations and δ13C values of methane and dissolved inorganic carbon in small European lakes

et al. 2015

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Methane (CH 4 ) and carbon dioxide emissions from lakes are relevant for assessing the greenhouse gas output of wetlands. However, only few standardized datasets describe concentrations of these gases in lakes across different geographical regions. We studied concentrations and stable carbon isotopic composition (d 13 C) of CH 4 and dissolved inorganic carbon (DIC) in 32 small lakes from Finland, Sweden, Germany, the Netherlands, and Switzerland in late summer. Higher concentrations and d 13 C values of DIC were observed in calcareous lakes than in lakes on non-calcareous areas. In stratified lakes, d 13 C values of DIC were generally lower in the hypolimnion due to the degradation of organic matter (OM). Unexpectedly, increased d 13 C values of DIC were registered above the sediment in several lakes. This may reflect carbonate dissolution in calcareous lakes or methanogenesis in deepwater layers or in the sediments. Surface water CH 4 concentrations were generally higher in western and central European lakes than in Fennoscandian lakes, possibly due to higher CH 4 production in the littoral sediments and lateral transport, whereas CH 4 concentrations in the hypolimnion did not differ significantly between the regions. The d 13 C values of CH 4 in the sediment suggest that d 13 C values of biogenic CH 4 are not necessarily linked to d 13 C values of sedimentary OM but may be strongly influenced by OM quality and methanogenic pathway. Our study suggests that CH 4 and DIC cycling in small lakes differ between geographical regions and that this should be taken into account when regional studies on greenhouse gas emissions are upscaled to inter-regional scales.

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Section: Methane Concentrations Within the Water Columnmentioning

confidence: 99%

An inter-regional assessment of concentrations and δ13C values of methane and dissolved inorganic carbon in small European lakes

et al. 2015

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“…nitrogen and phosphorus, from anthropogenic sources demonstrated that the excess availability of nutrients not only stimulates primary production but also has significant effects on microbial processes (e.g. Liikanen et al 2002). The elevated mineralization consumes oxygen (O 2 ) in the overlying water and interstitial water, leading to lake anoxia (the absence of adequate DO) (Smith et al 1999), favoring anaerobic microbial processes, e.g.…”

Section: Discussionmentioning

confidence: 99%

“…With regard to nitrogen, sediments generally represent an important source of ammonium and a sink for nitrate (Seitzinger 1988;Denis et al 2001;Liikanen et al 2002;Liikanen and Martikainen 2003;Hasegawa and Okino 2004). Denitrification is known to remove nitrogen by bacterial reduction of nitrate to nitrogen gas via nitrite in anoxic sediment environments, and may be based on both nitrate diffusing from the water column into the sediments and on nitrate produced by nitrification (Seitzinger 1988;Howarth et al 1988).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen dynamics in large shallow eutrophic Lake Chaohu, China

Zhang

Xie

2007

Environ Geol

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Temporal and spatial dynamics of nitrogen in lake and interstitial water were studied monthly in a large shallow, eutrophic lake in subtropical China from October 2002 to September 2003. The distribution of nitrogen was consistent with the idea that high nitrogen concentrations in the western part of the lake resulted from high levels of the nutrients from the surrounding cities through sewagedrainage systems. Nitrate was the predominant form of nitrogen in the overlying water, while ammonium was predominant in the interstitial water, indicating that strong oxidative nutrient regeneration occurred near the sediment-water interface. Nitrate could be an important dissolved inorganic matter source for phytoplankton, which in turn influenced the seasonal variations of nitrate concentrations in lake water. Significant positive correlation between ammonium fluxes and water temperature was observed and could probably be attributed to the intensified ammonification and nitrate reduction with increased temperature. Positive correlation between ammonium fluxes and algae biomass and Chl a concentrations may indicate that phytoplankton was an important factor driving ammonium fluxes in our study lake, and vice versa that higher fluxes of ammonium supported a higher biomass of the phytoplankton.

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“…where P 0 is a calibrated constant reflecting the amount and quality of organic material in sediments with respect to CH 4 production, α new = 3 m −1 a constant controlling the decrease of CH 4 production with depth, H a step (Heaviside) function, q 10 = 2.3 (Liikanen et al, 2002) the temperature dependency constant, T mp the melting point temperature, α O 2 ,inhib a constant describing the rate of inhibition of CH 4 production with rise of bulk O 2 concentration in sediments, C O 2 ,s . The latter constant is set as α O 2 ,inhib = 316.8 m 3 mol −1 to ensure 100 times inhibition of CH 4 production at an O 2 content of 10 ppm, implying almost complete suppression of methanogenic Archaea activity under this concentration (Borrel et al, 2011).…”

Section: Methane In Sedimentsmentioning

confidence: 99%

“…Aerobic CH 4 oxidation in water follows Michaelis-Menten kinetics (Eq. 14) with the respective constants V max,w = 1.16 × 10 −5 mol (m 3 s) −1 (Liikanen et al, 2002), K CH 4 ,w = 3.75×10 −2 mol m −3 (Liikanen et al, 2002;Lofton et al, 2013) and K O 2 ,w = 2.1 × 10 −2 mol m −3 (Lidstrom and Somers, 1984). …”

Section: Methane In Watermentioning

confidence: 99%

LAKE 2.0: a model for temperature, methane, carbon dioxide and oxygen dynamics in lakes

et al. 2016

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Abstract. A one-dimensional (1-D) model for an enclosed basin (lake) is presented, which reproduces temperature, horizontal velocities, oxygen, carbon dioxide and methane in the basin. All prognostic variables are treated in a unified manner via a generic 1-D transport equation for horizontally averaged property. A water body interacts with underlying sediments. These sediments are represented by a set of vertical columns with heat, moisture and CH 4 transport inside. The model is validated vs. a comprehensive observational data set gathered at Kuivajärvi Lake (southern Finland), demonstrating a fair agreement. The value of a key calibration constant, regulating the magnitude of methane production in sediments, corresponded well to that obtained from another two lakes. We demonstrated via surface seiche parameterization that the near-bottom turbulence induced by surface seiches is likely to significantly affect CH 4 accumulation there. Furthermore, our results suggest that a gas transfer through thermocline under intense internal seiche motions is a bottleneck in quantifying greenhouse gas dynamics in dimictic lakes, which calls for further research.

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Untitled

Cited by 153 publications

References 31 publications

An inter-regional assessment of concentrations and δ13C values of methane and dissolved inorganic carbon in small European lakes

An inter-regional assessment of concentrations and δ13C values of methane and dissolved inorganic carbon in small European lakes

Nitrogen dynamics in large shallow eutrophic Lake Chaohu, China

LAKE 2.0: a model for temperature, methane, carbon dioxide and oxygen dynamics in lakes

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