Conjunctive use of in situ gas sampling and chromatography with geospatial analysis to estimate greenhouse gas emissions of a large Amazonian hydroelectric reservoir

Brandao, Isabel Leidiany de Sousa; Mannaerts, Chris M.; Brandão, Isaque Wilkson de Sousa; Queiroz, Joaquim Carlos Barbosa; Verhoef, W.; Saraiva, Augusto Cesar Fonseca; Filho, Heronides Adonias Dantas

doi:10.1016/j.scitotenv.2018.08.403

Cited by 10 publications

(9 citation statements)

References 38 publications

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“…For the measurement of diffusive fluxes, four samples were taken at each point, every 7 min, for a total of 28 min of monitoring (IHA 2010; Sousa et al 2019). This methodology was performed in order to provide data to perform linear regressions over time and to quantify the amount of both CO 2 and CH 4 .…”

Section: Determination Of Diffusive Emissionsmentioning

confidence: 99%

“…Finally, the correlation coefficient between the concentration of each gas versus time (R 2 . 0.90) and the analysis of variance (p , 0.05) were determined according to the methodologies proposed by Sousa et al (2019), Guérin & Abril (2007) and Soumis et al (2004). The diffusive fluxes in units of g/m 2 • d were determined from the ideal gases equation, using the following equation.…”

Section: Determination Of Diffusive Emissionsmentioning

confidence: 99%

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Estimation of greenhouse gas emissions of a tropical reservoir in Colombia

Loaiza

Mesa

2022

Journal of Water and Climate Change

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Tropical reservoirs are generally flooded in soils with a high content of organic matter. This, combined with high temperatures, favors the generation of carbon dioxide (CO2) and methane (CH4) by biological degradation, contributing to the impact on climate change. A tropical reservoir in Colombia was monitored for 7 years in the pre-fill, fill and post-fill stages, for the last of these during the day and night. Emissions from diffusive fluxes at the surface of the water were measured using a floating static chamber, while inverted funnel methodology was used to measure the fluxes by bubbling. The samples collected in the field were analyzed in the laboratory using a gas chromatograph with a mass detector. The results showed average emissions of 70,892.51 ± 41,079.16-ton CO2eq/year for pre-filling; 178,254.53 ± 105,838.01-ton CO2eq/year for filling; and 466,946.57-ton CO2eq/year for post-filling (for 5 years), concluding that the weather conditions and the filling percentage (Area surface and volume) had an impact on the generation of greenhouse gases at filling and post-filling stages, as did the organic matter present in the area of influence of the sampling point. Higher greenhouse gas emissions were found during the day compared to the results at night, indicating that temperature affects these processes, especially in tropical reservoirs. This study, currently unique in Colombia, will allow directing efforts towards mitigating the impacts of greenhouse gas emissions in tropical reservoirs.

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Section: Determination Of Diffusive Emissionsmentioning

confidence: 99%

Section: Determination Of Diffusive Emissionsmentioning

confidence: 99%

Estimation of greenhouse gas emissions of a tropical reservoir in Colombia

Loaiza

Mesa

2022

Journal of Water and Climate Change

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“…These studies enabled high-resolution mapping of the whole-lake pCO 2 compared to field surveys. The sensors used in the current studies (Landsat, Sentinel-2, MODIS, and MERIS) have provided either high spatiotemporal coverage or sufficient radiometric sensitivity, which can assist reliable estimations of pCO 2 or CO 2 flux in single specific water [80,110,111]. For inland waters (except the optical indicators of surface water used indirectly to estimate pCO 2 ), direct satellite estimation of pCO 2 or dissolved CO 2 concentrations are required to construct a spatiotemporal map of pCO 2 .…”

Section: Challenges and Limitations Of Pco 2 Remote Sensing Algorithmsmentioning

confidence: 99%

A Review of Quantifying pCO2 in Inland Waters with a Global Perspective: Challenges and Prospects of Implementing Remote Sensing Technology

et al. 2021

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The traditional field-based measurements of carbon dioxide (pCO2) for inland waters are a snapshot of the conditions on a particular site, which might not adequately represent the pCO2 variation of the entire lake. However, these field measurements can be used in the pCO2 remote sensing modeling and verification. By focusing on inland waters (including lakes, reservoirs, rivers, and streams), this paper reviews the temporal and spatial variability of pCO2 based on published data. The results indicate the significant daily and seasonal variations in pCO2 in lakes. Rivers and streams contain higher pCO2 than lakes and reservoirs in the same climatic zone, and tropical waters typically exhibit higher pCO2 than temperate, boreal, and arctic waters. Due to the temporal and spatial variations of pCO2, it can differ in different inland water types in the same space-time. The estimation of CO2 fluxes in global inland waters showed large uncertainties with a range of 1.40–3.28 Pg C y−1. This paper also reviews existing remote sensing models/algorithms used for estimating pCO2 in sea and coastal waters and presents some perspectives and challenges of pCO2 estimation in inland waters using remote sensing for future studies. To overcome the uncertainties of pCO2 and CO2 emissions from inland waters at the global scale, more reliable and universal pCO2 remote sensing models/algorithms will be needed for mapping the long-term and large-scale pCO2 variations for inland waters. The development of inverse models based on dissolved biogeochemical processes and the machine learning algorithm based on measurement data might be more applicable over longer periods and across larger spatial scales. In addition, it should be noted that the remote sensing-retrieved pCO2/the CO2 concentration values are the instantaneous values at the satellite transit time. A major technical challenge is in the methodology to transform the retrieved pCO2 values on time scales from instant to days/months, which will need further investigations. Understanding the interrelated control and influence processes closely related to pCO2 in the inland waters (including the biological activities, physical mixing, a thermodynamic process, and the air–water gas exchange) is the key to achieving remote sensing models/algorithms of pCO2 in inland waters. This review should be useful for a general understanding of the role of inland waters in the global carbon cycle.

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“…Ionic liquids are another prominent example of green separation, including extraction and chromatography [19]. The application of ionic liquids has been well demonstrated and established [19,20] in separation science since their discovery in 1914 [21] because of their unique solvating properties related to their polarity and ionic character, negligible vapour pressure and high thermal stability. Ionic liquids are organic salts with melting points equal to below 100 ˚C.…”

Section: Ionic Liquidsmentioning

confidence: 99%

Strategy for Sustainable and Green Chromatographic Separation Science: Innovation, Technology and Application

Mohammad

Azmir

Ademario

et al. 2020

CCHG

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: Green separation science involves extraction, pre-concentration and chromatographic analysis aiming at minimizing environmental impact by reducing energy and reagent usage and reducing or eliminating waste generation. However, the enrichment of trace analytes and/or the analysis of complex matrices most frequently require several steps before analysis, such as extraction, pre-concentration, clean up and preparative chromatography. Thus, alternative and greener separation techniques and solvents are replacing classical methods to diminish the carbon footprint and increase sustainability. Moreover, many innovations are also emerging to curtail the environmental impact of samples analysis; such as micro or nano analytical platforms, sensor-based systems and direct injection to high resolution mass spectrometry. The current review provides an updated account of the green and sustainable separation science techniques. The current innovations on greener separations and their application in different fields of study are discussed.

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Conjunctive use of in situ gas sampling and chromatography with geospatial analysis to estimate greenhouse gas emissions of a large Amazonian hydroelectric reservoir

Cited by 10 publications

References 38 publications

Estimation of greenhouse gas emissions of a tropical reservoir in Colombia

Estimation of greenhouse gas emissions of a tropical reservoir in Colombia

A Review of Quantifying pCO2 in Inland Waters with a Global Perspective: Challenges and Prospects of Implementing Remote Sensing Technology

Strategy for Sustainable and Green Chromatographic Separation Science: Innovation, Technology and Application

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