Greenhouse gas emissions from a semi-arid tropical reservoir in northeastern Brazil

Rodriguez, Maricela; Casper, Peter

doi:10.1007/s10113-018-1289-7

Cited by 13 publications

(3 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Excluding the extreme values (> 10 1 μmol L -1 ), the measured CH 4 surface concentrations ( C w _ CH4 ) were comparable to values previously reported for the epilimnion in other tropical reservoirs [ 15 , 24 , 41 , 42 ]. The upper limit (3 μmol L -1 ) is at the high end of concentrations reported for stratified waters, even if compared to values reported for tropical reservoirs with high organic load, such as Furnas Reservoir in Brazil [ 15 ].…”

Section: Discussionsupporting

confidence: 85%

CO2 and CH4 dynamics in a eutrophic tropical Andean reservoir

Bohórquez-Bedoya,

León-Hernández,

Lorke

et al. 2024

PLoS ONE

View full text Add to dashboard Cite

We studied the dynamics of methane (CH4) and carbon dioxide (CO2) in a eutrophic tropical reservoir located in the Colombian Andes. Temporal and spatial dynamics were addressed through sampling during six field campaigns conducted throughout a two-year period. We monitored fluxes at the air-water interface, dissolved gas concentrations, physical and chemical properties of the water column, microstructure profiles of turbulence, and meteorological conditions. Throughout the study period, the reservoir was a persistent source of CH4 to the atmosphere with higher emissions occurring in the near inflow region. During periods of low water levels, both the emissions and surface concentrations of CH4 were higher and more spatially heterogeneous. The measured CO2 fluxes at the air-water interface changed direction depending on the time and location, showing alternating uptake and emissions by the water surface. Mass balances of dissolved CH4 in the surface mixed layer revealed that biochemical reactions and gas evasion were the most significant processes influencing the dynamics of dissolved CH4, and provided new evidence of possible oxic methane production. Our results also suggest that surface CH4 concentrations are higher under more eutrophic conditions, which varied both spatially and temporally.

show abstract

Section: Discussionsupporting

confidence: 85%

CO2 and CH4 dynamics in a eutrophic tropical Andean reservoir

Bohórquez-Bedoya,

León-Hernández,

Lorke

et al. 2024

PLoS ONE

View full text Add to dashboard Cite

show abstract

“…Tropical reservoirs in humid regions are often blamed for their huge greenhouse gas (GHG) emissions: but does this also apply to a semi-arid reservoir? Rodriguez and Casper (2018) confirm that the semi-arid tropical Itaparica Reservoir is in fact a source of GHG emissions. They emphasize, however, the spatial and temporal variability in the magnitude of the emissions.…”

Section: The Comprehensive Research Project Innovate and Its Study Resupporting

confidence: 54%

The legacy of large dams and their effects on the water-land nexus

et al. 2018

View full text Add to dashboard Cite

Large dams trigger controversial effectsMan-made river dams and reservoirs have increasingly been constructed to modify free-flowing rivers to benefit society through hydropower generation, irrigation, and other water supplies, navigation, and flood prevention. However, this ongoing global boom (Zarfl et al. 2015) also triggers harmful outcomes to local, directly affected stakeholder groups, and the environment. Particularly, profound social impacts of involuntary resettlement need alleviating measures and room for remembrance. Restoring vital characteristics of aquatic ecosystems after artificial reservoir establishment, to any possible degree, may contribute to higher welfare and sustainability.Large reservoirs cause both particularly large positive and negative effects on society, the economy, and the environment. In Brazil, reservoirs were initially constructed for the primary purpose of hydroelectricity generation, to prevent flooding, and to provide irrigation capacities in the dryer parts of the country. However, an increasing number of users and usages have increased the pressure on stored and flowing water. Their requirements differ in terms of river discharge, water quality, and reservoir levels, most often reducing the options of the water users downstream. The resolution of conflicts over water allocation and management has been legally supported by the Brazilian Water Act since 1997, which introduced the paradigm of multiple and equally important water uses.Several of these water uses are closely linked to land-use practices, particularly irrigated agriculture. By law, domestic supply for the river basin's residents sets a priority for water consumption during pronounced water scarcity. In terms of accessibility and water quality, water abstraction for domestic supply is being affected by water levels. Domestic water supply is also directly linked to water pollution through dilution of untreated wastewater in the river or reservoir. The intertwined and often divergent necessities and externalities of water and land use call for a coordinated management and governance approach to mitigate conflicts. Yet many of * Marianna Siegmund-Schultze m.siegmund-schultze@tu-berlin.de Maria do Carmo Sobral msobral@ufpe.br Márcia M. G. Alcoforado de Moraesthe natural and societal processes underlying these conflicts have not been sufficiently understood. Climate change causes additional burdens on river basins. While a general rainfall reduction has not been confirmed by climate simulations in the semi-arid regions of Brazil (increasing as well as decreasing climate model simulations have been proposed), rising temperature projections are more certain. These conditions will impact the growth of cultivated crops and natural vegetation, as well as increase heat stress on domestic and wild animals. The subsequent change of habitats will ultimately affect the provision of ecosystem services.The INNOVATE project (Interplay among multiple uses of water reservoirs via in novative coupling of aquatic and terrestrial ecosys...

show abstract

“…Methane can be exported from the sediment through molecule diffusion, ebullition (bubbles), or combination of them (Bastviken et al, ; Hu et al, ). Ebullition is often considered as the main CH 4 emission pathway in reservoirs, rivers, and lakes (e.g., Bastviken et al, ; Chuang et al, ; Natchimuthu et al, ; Rodriguez & Casper, ; Xiao et al, ). However, such information from aquaculture ponds is still very limited (Yang, Bastviken, et al, ).…”

Section: Discussionmentioning

confidence: 99%

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

et al. 2019

View full text Add to dashboard Cite

Mariculture shrimp ponds are important CH4 sources to the atmosphere. However, the spatiotemporal variations of CH4 concentration and flux at fine spatial scales in mariculture ponds are poorly known, particularly in China, worlds largest aquaculture producer. In this study, the plot‐scale spatiotemporal variations of water CH4 concentration and flux, both within and among ponds, were researched in shrimp ponds in Shanyutan wetland, Min River Estuary, Southeast China. The average water CH4 concentration and diffusion flux across the water‐air interface in the shrimp ponds over the shrimp aquaculture period varied from 2.29 ± 0.29 to 50.48 ± 20.91 μM and from 0.09 ± 0.01 to 2.32 ± 0.95 mmol·m−2·hr−1, respectively. The CH4 emissions from the estuarine ponds varied greatly between seasons, with peaks in August and September, which was similar to the trend of water temperature and dissolved oxygen concentrations. There was no remarkable difference in CH4 concentration and flux between shrimp ponds but significantly spatiotemporal differences in CH4 concentration and flux within the ponds. Significantly higher emissions occurred in the feeding zone, accounting for approximately 60% of total CH4 emission flux, while much lower CH4 emissions appeared in aeration zone, contributing 14% to total flux. This study suggests the importance of considering spatiotemporal variation in the whole‐pond estimates of CH4 concentration and flux. In light of such high spatial variation within ponds, improving aeration and feed utilization efficiency would help to mitigate CH4 emissions from mariculture ponds.

show abstract

Greenhouse gas emissions from a semi-arid tropical reservoir in northeastern Brazil

Cited by 13 publications

References 49 publications

CO2 and CH4 dynamics in a eutrophic tropical Andean reservoir

CO2 and CH4 dynamics in a eutrophic tropical Andean reservoir

The legacy of large dams and their effects on the water-land nexus

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

Contact Info

Product

Resources

About

Greenhouse gas emissions from a semi-arid tropical reservoir in northeastern Brazil

Cited by 13 publications

References 49 publications

CO2 and CH4 dynamics in a eutrophic tropical Andean reservoir

CO2 and CH4 dynamics in a eutrophic tropical Andean reservoir

The legacy of large dams and their effects on the water-land nexus

Large Fine‐Scale Spatiotemporal Variations of CH4 Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

Contact Info

Product

Resources

About

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China