High-frequency productivity estimates for a lake from free-water CO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; concentration measurements

Provenzale, Maria; Ojala, Anne; Heiskanen, Jouni; Erkkilä, Kukka‐Maaria; Mammarella, Ivan; Hari, Pertti; Vesala, Timo

doi:10.5194/bg-15-2021-2018

Cited by 7 publications

(9 citation statements)

References 46 publications

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“…Conversely, high solar radiation input combined with calm conditions results in the warming of near-surface water and the formation of a thin epilimnion with a lower CO 2 concentration. High solar radiation also enhances photosynthesis and thus increases the uptake of CO 2 (Provenzale et al, 2018). An overly deep simulated epilimnion resulted in enhanced CO 2 release from deeper layers and a higher total net CO 2 production in a larger epilimnetic volume, which were able to compensate for the CO 2 efflux in the simulations.…”

Section: Differences Between Calculated and Simulated Co 2 Fluxesmentioning

confidence: 91%

“…No data exist on Chl a concentration in Lake Kuivajärvi in 2013, but the Chl a concentration at 0-3 m was at its highest, 30-50 mg m −3 , in mid-July and decreased to a level of less than 2 mg m −3 in late autumn in years 2011-2012 (Heiskanen et al, 2015). The epilimnetic Chl a concentration is usually 3-5 mg m −3 during the growing season with diatom-induced peaks under cool conditions in spring and autumn (Provenzale et al, 2018). Thus, the GEMs with low near-surface Chl a concentrations, CC and TE, may have yielded better estimates of the overall phytoplankton biomass than HE and MI.…”

Section: Factors Influencing the Epilimnetic Co 2 Budgetmentioning

confidence: 99%

“…Phytoplankton is an significant factor in the lake CO 2 budget and the main driver of the diurnal variation of CO 2 concentration in Lake Kuivajärvi (Provenzale et al, 2018). In MyLake C, inorganic carbon is fixed by phytoplankton and carbon is stored in autochthonous organic matter within the water column or in bottom sediments until it is mineralized by bacteria.…”

Section: Factors Influencing the Epilimnetic Co 2 Budgetmentioning

confidence: 99%

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Applicability and consequences of the integration of alternative models for CO2 transfer velocity into a process-based lake model

Kiuru¹,

Ojala²,

Mammarella³

et al. 2019

Preprint

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Abstract. Freshwater lakes are important in carbon cycling especially in the boreal zone, where many lakes are supersaturated with the greenhouse gas carbon dioxide (CO2) and emit it to the atmosphere, thus ventilating carbon originally fixed by the terrestrial system. The exchange of CO2 between water and the atmosphere is commonly estimated using simple wind-based parameterizations or models of gas transfer velocity (k). More complex surface renewal models, however, have been shown to yield more correct estimates of k in comparison with direct CO2 flux measurements. We incorporated four gas exchange models with different complexity into a vertical process-based physicobiochemical lake model MyLake C and assessed the performance and applicability of the alternative lake model versions to simulate air-water CO2 fluxes over a small boreal lake. None of the incorporated gas exchange models significantly outperformed the other models in the simulations in comparison to the measured near-surface CO2 concentrations or respective air-water CO2 fluxes calculated directly with the gas exchange models using measurement data as input. The use of more complex gas exchange models in the simulation, on the contrary, led to difficulties in obtaining sufficient gain of CO2 in the water column and thus resulted in lower CO2 fluxes and water column CO2 concentrations compared to the respective measurement-based values. Inclusion of sophisticated and more correct models for air-water CO2 exchange in process-based lake models is crucial in efforts to properly assess lacustrine carbon budgets through model simulations both in single lakes and on a larger scale. However, finding higher estimates for both the internal and the external sources of inorganic carbon in boreal lakes is important if the improved knowledge of the magnitude of CO2 evasion from lakes is included in future studies on lake carbon budgets.

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Section: Differences Between Calculated and Simulated Co 2 Fluxesmentioning

confidence: 91%

Section: Factors Influencing the Epilimnetic Co 2 Budgetmentioning

confidence: 99%

Section: Factors Influencing the Epilimnetic Co 2 Budgetmentioning

confidence: 99%

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Applicability and consequences of the integration of alternative models for CO2 transfer velocity into a process-based lake model

Kiuru¹,

Ojala²,

Mammarella³

et al. 2019

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…The sensors were in a temperature-controlled box in the platform. For more detailed information on the measurement setup, see Hari et al (2008) and Provenzale et al (2018). The concentrations in the water (lmol L -1 ) were calculated using the temperature dependence of CO 2 solubility in water using an appropriate Henrys law constant and the equation from Hari et al (2008)…”

Section: Lakementioning

confidence: 99%

Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years

et al. 2020

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We studied in 2013 and 2014 the spring carbon dynamics in a Boreal landscape consisting of a lake and 15 inflowing streams and an outlet. The first year had weather and a hydrological regime typical of past years with a distinct spring freshet connected with the thaw of the average snowpack. The latter year had higher air temperatures which did not permit snow accumulation, despite similar winter precipitation. As such, there was hardly any spring freshet in 2014, and stream discharge peaked in January, i.e., the conditions resembled those predicted in the future climate. Despite the hydrological differences between the years, there were only small interannual differences in the stream CO 2 and DOC concentrations. The relationship between the concentrations and discharge was stronger in the typical year. CO 2 concentrations in medium-sized streams correlated negatively with the discharge, indicating dilution effect of melting

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“…Global estimates of carbon emissions from lakes often use conservative estimates of CO 2 fluxes or models that yield potentially underestimated values for k, leading to low estimates of CO 2 fluxes (e.g., Cole et al, 2007;Raymond et al, 2013). Thus, revised estimates of lacustrine CO 2 emissions will require higher net ecosystem production in the land-based ecosystems of the terrestrial biosphere to close the global carbon balance (Battin et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Applicability and consequences of the integration of alternative models for CO2 transfer velocity into a process-based lake model

et al. 2019

Self Cite

View full text Add to dashboard Cite

Abstract. Freshwater lakes are important in carbon cycling, especially in the boreal zone where many lakes are supersaturated with the greenhouse gas carbon dioxide (CO2) and emit it to the atmosphere, thus ventilating carbon originally fixed by the terrestrial system. The exchange of CO2 between water and the atmosphere is commonly estimated using simple wind-based parameterizations or models of gas transfer velocity (k). More complex surface renewal models, however, have been shown to yield more correct estimates of k in comparison with direct CO2 flux measurements. We incorporated four gas exchange models with different complexity into a vertical process-based physico-biochemical lake model, MyLake C, and assessed the performance and applicability of the alternative lake model versions to simulate air–water CO2 fluxes over a small boreal lake. None of the incorporated gas exchange models significantly outperformed the other models in the simulations in comparison to the measured near-surface CO2 concentrations or respective air–water CO2 fluxes calculated directly with the gas exchange models using measurement data as input. The use of more complex gas exchange models in the simulation, on the contrary, led to difficulties in obtaining a sufficient gain of CO2 in the water column and thus resulted in lower CO2 fluxes and water column CO2 concentrations compared to the respective measurement-based values. The inclusion of sophisticated and more correct models for air–water CO2 exchange in process-based lake models is crucial in efforts to properly assess lacustrine carbon budgets through model simulations in both single lakes and on a larger scale. However, finding higher estimates for both the internal and external sources of inorganic carbon in boreal lakes is important if improved knowledge of the magnitude of CO2 evasion from lakes is included in future studies on lake carbon budgets.

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High-frequency productivity estimates for a lake from free-water CO<sub>2</sub> concentration measurements

Cited by 7 publications

References 46 publications

Applicability and consequences of the integration of alternative models for CO<sub>2</sub> transfer velocity into a process-based lake model

Applicability and consequences of the integration of alternative models for CO<sub>2</sub> transfer velocity into a process-based lake model

Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years

Applicability and consequences of the integration of alternative models for CO<sub>2</sub> transfer velocity into a process-based lake model

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High-frequency productivity estimates for a lake from free-water CO&lt;sub&gt;2&lt;/sub&gt; concentration measurements

Cited by 7 publications

References 46 publications

Applicability and consequences of the integration of alternative models for CO&lt;sub&gt;2&lt;/sub&gt; transfer velocity into a process-based lake model

Applicability and consequences of the integration of alternative models for CO&lt;sub&gt;2&lt;/sub&gt; transfer velocity into a process-based lake model

Carbon dynamics in a Boreal land-stream-lake continuum during the spring freshet of two hydrologically contrasting years

Applicability and consequences of the integration of alternative models for CO&lt;sub&gt;2&lt;/sub&gt; transfer velocity into a process-based lake model

Contact Info

Product

Resources

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High-frequency productivity estimates for a lake from free-water CO<sub>2</sub> concentration measurements

Applicability and consequences of the integration of alternative models for CO<sub>2</sub> transfer velocity into a process-based lake model

Applicability and consequences of the integration of alternative models for CO<sub>2</sub> transfer velocity into a process-based lake model

Applicability and consequences of the integration of alternative models for CO<sub>2</sub> transfer velocity into a process-based lake model