Hotspots of Diffusive CO<sub>2</sub> and CH<sub>4</sub> Emission From Tropical Reservoirs Shift Through Time

Paranaíba, José R.; Barros, Nathan; Almeida, Rafael M.; Linkhorst, Annika; Mendonça, Raquel; Vale, Roseilson Souza do; Roland, Fábio; Sobek, Sebastian

doi:10.1029/2020jg006014

Cited by 18 publications

(18 citation statements)

References 81 publications

(162 reference statements)

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“…It is thus likely that the rapid release of any gas bubbles accumulated in the sediment LINKHORST ET AL. (Paranaíba et al, 2021) 30.8 ± 0.3 290 ± 3 1.0 ± 0.0 34 ± 1 CO 2 diffusion (Paranaíba et al, 2021) 18.8 ± 0.4 177 ± 4 1.7 ± 0.0 61 ± 1…”

Section: Reservoir Productivity and Ebullitionmentioning

confidence: 97%

“…Mean and total fluxes are given ± SEM, where the sum of the SEM for total C emission is calculated by error propagation as the root of the sum of the squared SEMs of the single mean fluxes. Paranaíba et al (2021) (CDU: April 2016and FUN: October 2017 were released prior to our measurement campaign, and we can therefore assume that bubble release was at steady state with CH 4 production in the sediment.…”

Section: Reservoir Productivity and Ebullitionmentioning

confidence: 99%

“…Using CH 4 ebullition data of this study and CH 4 diffusion data of subsequent measurements by Paranaíba et al (2021), the mean areal CH 4 emission that we estimated for CDU (78 ± 1 mg C m −2 d −1 for CH 4 ebullition + diffusion; mean ± SEM) was below the global mean reservoir surface CH 4 emission rate (120 mg C m −2 d −1 for CH 4 ebullition + diffusion; Deemer et al, 2016). The mean areal CH 4 emission estimate for FUN (215 ± 2 mg C m −2 d −1 for CH 4 ebullition + diffusion; mean ± SEM) was at the higher end of reported reservoir emission estimates, as would be expected considering the trophic state of this reservoir (Deemer et al, 2016 S13), which is when our hydroacoustic survey was conducted (October 2016).…”

Section: Daily Reservoir C Emissionmentioning

confidence: 99%

“…We multiplied the mean CH 4 ebullition and the water surface area within each individual grid cell and summed them up to estimate total reservoir CH 4 ebullition for each upscaling approach. Total C emission from each reservoir was calculated as CH 4 ebullition plus CH 4 and CO 2 diffusion, which was taken from Paranaíba et al (2021). CO 2 ebullition is negligible in these reservoirs (unpublished data).…”

Section: Calculation Of Whole-reservoir C Emissionmentioning

confidence: 99%

“…We used bubble trap deployments during dry and wet season for an estimation of seasonal differences in CH 4 ebullition. Finally, we combined our whole-reservoir CH 4 ebullition estimates with whole-reservoir CH 4 and CO 2 diffusion estimates (Paranaíba et al, 2018(Paranaíba et al, , 2021 to calculate the total C emission for these two contrasting tropical reservoirs.…”

mentioning

confidence: 99%

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Spatially Resolved Measurements in Tropical Reservoirs Reveal Elevated Methane Ebullition at River Inflows and at High Productivity

Linkhorst

Paranaíba

Mendonça

et al. 2021

Global Biogeochemical Cycles

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Reservoirs are artificial lakes that are created by the damming of rivers. They can serve different purposes, such as the generation of electricity, water supply for drinking water or irrigation, flood protection, or recreation. Nearly 60% of dams worldwide are primarily built for water storage, either for irrigation (47%) or water supply purposes (12%), and 20% have been built for hydropower (Mulligan et al., 2020). In the face of climate change, water storage will become increasingly important (Ehsani et al., 2017), and hydropower projects are increasing in number worldwide (Zarfl et al., 2015). However, greenhouse gas emission from

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Section: Reservoir Productivity and Ebullitionmentioning

confidence: 97%

Section: Reservoir Productivity and Ebullitionmentioning

confidence: 99%

Section: Daily Reservoir C Emissionmentioning

confidence: 99%

Section: Calculation Of Whole-reservoir C Emissionmentioning

confidence: 99%

mentioning

confidence: 99%

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Spatially Resolved Measurements in Tropical Reservoirs Reveal Elevated Methane Ebullition at River Inflows and at High Productivity

Linkhorst

Paranaíba

Mendonça

et al. 2021

Global Biogeochemical Cycles

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Greenhouse gas emissions hotspots and drivers of urban freshwater bodies in areas of the Yangtze River delta, China

et al. 2022

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In the modern era, urban freshwater bodies play a significant role in global carbon (C) budgeting, therefore, impacting climate change under rising global mean temperature. However, the trend, magnitude and drivers of greenhouse gas (GHG) emissions in these urban freshwater bodies of China remain uncertain. This study investigated temporal changes in GHG emissions in urban water bodies, including artificial lakes, reservoirs, aquaculture ponds and rivers, within a year in Nanjing city in the areas of the Yangtze River delta of China. In addition, meteorological and hydrochemical parameters were measured to elucidate the key drivers of GHG emissions. The results showed that the average annual flux of carbon dioxide (CO2) and methane (CH4) in aquaculture ponds was estimated to be 1355.6 mg CO2 m−2 day−1 and 116.6 mg CH4 m−2 day−1, followed by that of artificial lakes were 1172.2 mg CO2 m−2 day−1 and 44.1 mg CH4 m−2 day−1, rivers reached 775.9 mg CO2 m−2 day−1 and 23.9 mg CH4 m−2 day−1 and reservoirs were 170.1 mg CO2 m−2 day−1 and 7.2 mg CH4 m−2 day−1, respectively. The results further suggest that although artificial lakes and aquaculture ponds occupied only 23% of the cumulative area under lakes and ponds in the Yangtze River delta, contribute approximately 43%, about 27.5 Gg C, of total fluxes. Furthermore, high concentrations of dissolved organic carbon (DOC) and low dissolved oxygen (DO) coincided with the high GHG emissions. The study suggests that DO, DOC, temperature and wind speed are the key factors impacting the potential of GHG emissions in urban freshwater ecosystems. Strategic mitigation measures in the vicinity of the urban freshwater bodies could efficiently reduce carbon emissions in the future.

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Spatial and temporal variability in summertime dissolved carbon dioxide and methane in temperate ponds and shallow lakes

Ray

Holgerson

Andersen

et al. 2023

Limnology & Oceanography

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Small waterbodies have potentially high greenhouse gas emissions relative to their small footprint on the landscape, although there is high uncertainty in model estimates. Scaling their carbon dioxide (CO2) and methane (CH4) exchange with the atmosphere remains challenging due to an incomplete understanding and characterization of spatial and temporal variability in CO2 and CH4. Here, we measured partial pressures of CO2 (pCO2) and CH4 (pCH4) across 30 ponds and shallow lakes during summer in temperate regions of Europe and North America. We sampled each waterbody in three locations at three times during the growing season, and tested which physical, chemical, and biological characteristics related to the means and variability of pCO2 and pCH4 in space and time. Summer means of pCO2 and pCH4 were inversely related to waterbody size and positively related to floating vegetative cover; pCO2 was also positively related to dissolved phosphorus. Temporal variability in partial pressure in both gases weas greater than spatial variability. Although sampling on a single date was likely to misestimate mean seasonal pCO2 by up to 26%, mean seasonal pCH4 could be misestimated by up to 64.5%. Shallower systems displayed the most temporal variability in pCH4 and waterbodies with more vegetation cover had lower temporal variability. Inland waters remain one of the most uncertain components of the global carbon budget; understanding spatial and temporal variability will ultimately help us to constrain our estimates and inform research priorities.

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Hotspots of Diffusive CO₂ and CH₄ Emission From Tropical Reservoirs Shift Through Time

Abstract: Reservoirs are important components of the global carbon (C) cycle (Cole et al., 2007;Tranvik et al., 2009). While reservoirs emit substantial amounts of carbon dioxide (CO 2 ) and methane (CH 4 ) to the atmosphere (

Cited by 18 publications

References 81 publications

Spatially Resolved Measurements in Tropical Reservoirs Reveal Elevated Methane Ebullition at River Inflows and at High Productivity

Spatially Resolved Measurements in Tropical Reservoirs Reveal Elevated Methane Ebullition at River Inflows and at High Productivity

Greenhouse gas emissions hotspots and drivers of urban freshwater bodies in areas of the Yangtze River delta, China

Spatial and temporal variability in summertime dissolved carbon dioxide and methane in temperate ponds and shallow lakes

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Hotspots of Diffusive CO2 and CH4 Emission From Tropical Reservoirs Shift Through Time

Abstract: Reservoirs are important components of the global carbon (C) cycle (Cole et al., 2007;Tranvik et al., 2009). While reservoirs emit substantial amounts of carbon dioxide (CO 2 ) and methane (CH 4 ) to the atmosphere (

Cited by 18 publications

References 81 publications

Spatially Resolved Measurements in Tropical Reservoirs Reveal Elevated Methane Ebullition at River Inflows and at High Productivity

Spatially Resolved Measurements in Tropical Reservoirs Reveal Elevated Methane Ebullition at River Inflows and at High Productivity

Greenhouse gas emissions hotspots and drivers of urban freshwater bodies in areas of the Yangtze River delta, China

Spatial and temporal variability in summertime dissolved carbon dioxide and methane in temperate ponds and shallow lakes

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Hotspots of Diffusive CO₂ and CH₄ Emission From Tropical Reservoirs Shift Through Time