Net Ecosystem Production of Lakes Estimated From Hypolimnetic Organic Carbon Sinks

Steinsberger, Thomas; Wüest, Alfred; Müller, Beat

doi:10.1029/2020wr029473

Cited by 8 publications

(5 citation statements)

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“…By applying the mass balance budgeting approach to deep oxygen profiles collected with the CTD probe, we found that the seasonal ecosystem respiration between 30 and 100 m depth was 23.2 mmol m −2 day −1 , or 37 g C m −2 (Figure ). The total ecosystem respiration (13.6 + 23.2 = 36.8 mmol m −2 day −1 ) is in very good agreement with the mean summer areal hypolimnetic remineralization derived from depletion rates in the historical time series (Schwefel et al., 2018; Steinsberger et al., 2020, 2021).…”

Section: Discussionsupporting

confidence: 78%

Primary and Net Ecosystem Production in a Large Lake Diagnosed From High‐Resolution Oxygen Measurements

Fernández-Castro

Chmiel

Minaudo

et al. 2021

Water Resources Research

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The term metabolism describes the carbon and energy transfer in, out, and within a living system, which may refer to the level of individual organisms as well as to the scale of entire ecosystems. In the aquatic environment, the functioning of ecosystem metabolism is often described by the rates of gross primary production (GPP) and ecosystem respiration (R), which together build the metabolic balance of a system,

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Section: Discussionsupporting

confidence: 78%

Primary and Net Ecosystem Production in a Large Lake Diagnosed From High‐Resolution Oxygen Measurements

Fernández-Castro

Chmiel

Minaudo

et al. 2021

Water Resources Research

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“…(Table 3). These values are comparable to the observed P:N ratio of seston in Lake Geneva (Steinsberger et al 2021).…”

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confidence: 88%

“…The annual phosphorus uptake in the productive layer (P-uptake) to sustain PP is calculated from the annual P-budget, given by the difference of the source and sink terms of P load (Krishna et al 2021;Steinsberger et al 2021). The source terms include the watershed contributions of the bioavailable dissolved reactive phosphorus (from the rivers and wastewater treatment plants around Lake Geneva), represented as DRP 𝑖𝑛 , and the net difference of P stock in the epilimnion before and after the production period (Fig.…”

Section: Annual Phosphorus Budgetmentioning

confidence: 99%

“…Thus, during the initial years of the present decade, the lake was still eutrophic, and then onward started to transition. The latter can also be inferred from the estimates of net ecosystem production (Steinsberger et al 2021;). Kiefer et al (2021) identified the total phosphorus threshold (TP 𝑠𝑤 𝑚𝑖𝑥 ) for lakes in Switzerland, below which they are classified as mesotrophic systems.…”

Section: )mentioning

confidence: 99%

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Disentangling the effects of climate change and reoligotrophication on primary production in a large lake

Krishna¹,

Ulloa²,

Barbe³

et al. 2022

Preprint

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Climate change and reduction in nutrient loads have significant effects on primary production and phytoplankton growth dynamics. Since in the last few decades in many regions, nutrients in lakes were reduced simultaneously as the climate changed. Yet, it remains unclear which of the two has impacted primary production the most. In this study, we couple the General Ocean Turbulence Model with the Ecological Regional Ocean Model to disentangle the effects of climate change and reoligotrophication on primary production (PP) in Lake Geneva, Switzerland-France. We apply a data assimilation method to calibrate the model with the observations from the past (1981-1990) and validate it against the in-situ data from the present decade (2011-2019). Both decades represent different climate conditions and trophic states of the lake.We show that the model is skilful to reproduce assimilated and unassimilated observations from both periods. According to our results, the effect of reoligotrophication on PP is marginally higher than that of warming, leading to a net decrease in primary production by 10% from the past to the present. The areal phosphorus supply in Lake Geneva, in spite of a decrease by 70%, is still characteristic of a meso-to-eutrophic ecosystem. This points towards an incomplete reoligotrophication of the lake. The effects of future climate change on winter mixing and PP dynamics have also been studied. Although there would be a significant reduction in deep mixing, the autotrophic production in Lake Geneva is expected to increase by 20% by the end of 21st century, largely due to stimulation in biomass build-up of temperature-dependent algae (e.g. dinoflagellates and cyanobacteria).Considering our results to represent other large temperate lakes with similar trophic status and water residence time as Lake Geneva, future climate scenarios are expected to bring back symptoms of eutrophication.

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“…Not all autochthonous carbon settles to the sediment where it is available for methanogenesis. The ratio of autochthonous carbon that does settle is referred to as the "export ratio" and mean export rates across a range of studies are approximately 40 ± 20% (Baines & Pace, 1994;Berman et al, 2010;Darchambeau et al, 2005.;De Vicente et al, 2008;Ostrovsky & Yacobi, 2010;Steinsberger et al, 2021;Teodoru et al, 2013). Based on these studies, we use a constant export ratio of 40% across reservoirs.…”

Section: Autochthonous Inputmentioning

confidence: 99%

Estimating Drivers and Pathways for Hydroelectric Reservoir Methane Emissions Using a New Mechanistic Model

et al. 2022

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Hydroelectric power is the dominant source of renewable energy globally. In 2017, it comprised 13% of global electricity production in OECD (Organization for Economic Co-operation and Development) countries (International Energy Agency, 2018), and 2.5% of global energy production. While electricity from hydropower can replace electricity from carbon-intensive sources such as coal and gas, reservoirs also emit methane (CH 4 ) which could negate some of the carbon benefits of switching to hydropower. CH 4 is a potent greenhouse gas with >32 times the warming potential of carbon dioxide over a 100-year time horizon (Etminan et al., 2016). Prior global CH 4 emissions estimates suggest 3 Tg C of CH 4 yr −1 is released from reservoir surfaces (Barros et al., 2011). This estimate increases to 13.3 Tg C as CH 4 yr −1 after accounting for spillways, turbines, river reaches below dams, and periodically inundated drawdown areas around the reservoir (Li & Zhang, 2014). While useful, these estimates are based on empirical relationships between emissions and potential drivers, and do not provide a process-based understanding of the main drivers and pathways for reservoir CH 4 production and releases, which would aid in development of mitigation strategies. Here we develop, evaluate, and apply a new mechanistic model of the processes driving global hydroelectric reservoir CH 4 emissions.

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Net Ecosystem Production of Lakes Estimated From Hypolimnetic Organic Carbon Sinks

Cited by 8 publications

References 55 publications

Primary and Net Ecosystem Production in a Large Lake Diagnosed From High‐Resolution Oxygen Measurements

Primary and Net Ecosystem Production in a Large Lake Diagnosed From High‐Resolution Oxygen Measurements

Disentangling the effects of climate change and reoligotrophication on primary production in a large lake

Estimating Drivers and Pathways for Hydroelectric Reservoir Methane Emissions Using a New Mechanistic Model

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