CO2 and CH4 diffusive and degassing fluxes from 2003 to 2009 at Eastmain 1 reservoir, Québec, Canada

Bastien, Julie

doi:10.5268/iw-1.2.349

Cited by 28 publications

(21 citation statements)

References 23 publications

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“…Greenhouse gas diffusive fluxes were measured using the floating chamber method (UNESCO/IHA ; Bastien et al . ) and various infrared gas analysers. CO 2 diffusive fluxes were measured either with a Ciras‐SC from PP Systems, DX‐4010 from Gasmet or G1301 from Picarro.…”

Section: Methodsmentioning

confidence: 99%

Spatio‐temporal variation of gross CO₂ and CH₄ diffusive emissions from Australian reservoirs and natural aquatic ecosystems, and estimation of net reservoir emissions

Bastien

Demarty

2013

Lakes & Reservoirs

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Carbon dioxide (CO 2 ) and methane (CH 4 ) diffusive emissions were measured during two field surveys in Queensland and Tasmania, Australia, using the floating chamber method. Bubbling and degassing emissions in 2010 were estimated in Koombooloomba Dam reservoir using only inverted funnels and gas concentrations, respectively. A total of 14 reservoirs and 16 rivers and lakes were sampled from 2006 to 2010. Spatial variation was substantial within each water body, as well as between them. The main drivers of diffusive emission variation were physiographic region and climate, with a clear demarcation being observed between diffusive emissions from tropical Queensland and temperate Tasmania, and between the humid West Coast Range (Tasmania) and dry Central Plateau (Tasmania). Higher CO 2 and CH 4 diffusive emissions were observed during the dry season, when long water residence times would promote organic matter degradation. Estimated total gross emissions, including diffusive, bubbling and degassing emissions, for Koombooloomba Dam reservoir were about 1.5 9 10 6 t CO 2 eq km 2 per year, or 24 9 10 6 t CO 2 eq per year. This corresponds to a plant emission factor of 3.18 kg CO 2 eq MWh À1 . Using an estimate of terrestrial emissions derived from literature data for the Tully River catchment area, rough estimated net emissions from the catchment area are about 44 kt CO 2 eq per year, or 5.83 kg CO 2 eq MWh À1 , which is in the lower range of the studied reservoirs.

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Section: Methodsmentioning

confidence: 99%

Spatio‐temporal variation of gross CO₂ and CH₄ diffusive emissions from Australian reservoirs and natural aquatic ecosystems, and estimation of net reservoir emissions

Bastien

Demarty

2013

Lakes & Reservoirs

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“…[18] Annual values were estimated from daily summer fluxes by assuming an average ice-free period in the region of 215 days, and that the C pool which has accumulated under the winter ice is released rapidly within the first month following the ice break and represents 30% of the annual emission as suggested by gas partial pressure data from both natural lakes (V. Ducharme-Riel et al, The contribution of winter under-ice and summer hypolimnetic CO 2 accumulation to the annual CO 2 budget of temperate and boreal lakes in Québec, submitted to Ecosystems, 2011) and the reservoir [Demarty et al, 2009;Bastien et al, 2011a].…”

Section: General Approachmentioning

confidence: 99%

“…At each sampling site we determined the C gas (CO 2 and CH 4 ) partial pressures and we used these surface concentrations to estimate diffusive fluxes based on the TBL method described earlier for the natural aquatic ecosystem; we measured diffusive fluxes at each site using floating chambers, also as described above. The inter-annual variability, spatial heterogeneity and the trend of both total reservoir flux and the underlying processes are thus embedded within the time series measurements over 4 years period [Teodoru et al, 2011;Bastien et al, 2011a].…”

Section: Eastmain-1 Reservoirmentioning

confidence: 99%

“…[23] Besides estimating diffusive fluxes, we used empirical estimates of degassing fluxes at the turbines and spillway from the time series pCO 2 and pCH 4 concentrations of the inlet water of the turbines measured continuously from September 2006 to December 2009 with an automated system installed at the Eastmain-1 powerhouse [Bastien et al, 2011a]. The assumption used in degassing flux calculations was that all the excess pCO 2 and pCH 4 (relative to the atmospheric values of 380 ppmv for CO 2 and 1.77 ppmv for CH 4 [Forster et al, 2007] was emitted into the atmosphere at the turbines or immediately downstream the powerhouse [Roehm and Tremblay, 2006].…”

Section: Eastmain-1 Reservoirmentioning

confidence: 99%

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The net carbon footprint of a newly created boreal hydroelectric reservoir

Teodoru

Bastien

Bonneville

et al. 2012

Global Biogeochemical Cycles

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137

102

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[1] We present here the first comprehensive assessment of the carbon (C) footprint associated with the creation of a boreal hydroelectric reservoir (Eastmain-1 in northern Québec, Canada). This is the result of a large-scale, interdisciplinary study that spanned over a 7-years period (2003)(2004)(2005)(2006)(2007)(2008)(2009)), where we quantified the major C gas (CO 2 and CH 4 ) sources and sinks of the terrestrial and aquatic components of the pre-flood landscape, and also for the reservoir following the impoundment in 2006. The pre-flood landscape was roughly neutral in terms of C, and the balance between pre-and post-flood C sources/sinks indicates that the reservoir was initially (first year post-flood in 2006) a large net source of CO 2 (2270 mg C m À2 d À1) but a much smaller source of CH 4 (0.2 mg C m À2 d À1). While net CO 2 emissions declined steeply in subsequent years (down to 835 mg C m À2 d À1 in 2009), net CH 4 emissions remained constant or increased slightly relative to pre-flood emissions. Our results also suggest that the reservoir will continue to emit carbon gas over the long-term at rates exceeding the carbon footprint of the pre-flood landscape, although the sources of C supporting these emissions have yet to be determined. Extrapolation of these empirical trends over the projected life span (100 years) of the reservoir yields integrated long-term net C emissions per energy generation well below the range of the natural-gas combined-cycle, which is considered the current industry standard.

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“…This CO 2 pulse emission process is closely related to thermal stratification and physical mixing processes in stratified reservoirs. However, data on CO 2 concentration vertical distributions in stratified reservoirs is limited; thus, large-scale carbon emissions after the turnover period have not been accurately accounted for in reservoir carbon emissions estimations [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

pCO2 Dynamics of Stratified Reservoir in Temperate Zone and CO2 Pulse Emissions During Turnover Events

Park

Chung

2018

Water

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This study explores the dynamic changes in the partial pressure of CO2 (pCO2) with depth, and the temporal variations of CO2 net atmospheric flux (NAF) in a stratified reservoir. A total of 16 field campaigns were conducted from the summer stratification to fall turnover period in 2017. A random forest (RF) model was developed to estimate the pCO2 using concurrently measured water quality variables. The results showed that the vertical distribution of pCO2 and associated temporal variations of the NAF are closely related to the stratification strength of the reservoir. The reservoir surface pCO2 was supersaturated (1542 µatm) in summer (July 11), but this decreased to undersaturation as algae grew. Meanwhile, dissolved CO2 continuously accumulated below the reservoir mixed-layer due to the thermal stratification barrier and organic-rich floodwater intrusion. Vertical mixing began instantly as the stratification strength began to weaken in mid-October, and the surface pCO2 increased sharply up to 1934 µatm. Consequently, the NAF drastically increased to 3235 mg−CO2 m−2·day−1, which implies that the NAF changes seasonally and large CO2 pulsing occurs during the turnover events. The results provide valuable information about pCO2 variability and physical mixing processes, as well as carbon budget estimation in stratified reservoirs, and offer an improved understanding of these phenomena.

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CO2 and CH4 diffusive and degassing fluxes from 2003 to 2009 at Eastmain 1 reservoir, Québec, Canada

Cited by 28 publications

References 23 publications

Spatio‐temporal variation of gross CO₂ and CH₄ diffusive emissions from Australian reservoirs and natural aquatic ecosystems, and estimation of net reservoir emissions

Spatio‐temporal variation of gross CO₂ and CH₄ diffusive emissions from Australian reservoirs and natural aquatic ecosystems, and estimation of net reservoir emissions

The net carbon footprint of a newly created boreal hydroelectric reservoir

pCO2 Dynamics of Stratified Reservoir in Temperate Zone and CO2 Pulse Emissions During Turnover Events

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CO2 and CH4 diffusive and degassing fluxes from 2003 to 2009 at Eastmain 1 reservoir, Québec, Canada

Cited by 28 publications

References 23 publications

Spatio‐temporal variation of gross CO2 and CH4 diffusive emissions from Australian reservoirs and natural aquatic ecosystems, and estimation of net reservoir emissions

Spatio‐temporal variation of gross CO2 and CH4 diffusive emissions from Australian reservoirs and natural aquatic ecosystems, and estimation of net reservoir emissions

The net carbon footprint of a newly created boreal hydroelectric reservoir

pCO2 Dynamics of Stratified Reservoir in Temperate Zone and CO2 Pulse Emissions During Turnover Events

Contact Info

Product

Resources

About

Spatio‐temporal variation of gross CO₂ and CH₄ diffusive emissions from Australian reservoirs and natural aquatic ecosystems, and estimation of net reservoir emissions

Spatio‐temporal variation of gross CO₂ and CH₄ diffusive emissions from Australian reservoirs and natural aquatic ecosystems, and estimation of net reservoir emissions