Cross-continental importance of CH4 emissions from dry inland-waters

Paranaíba, José R.; Aben, Ralf; Barros, Nathan; Quadra, Gabrielle Rabelo; Linkhorst, Annika; Amado, André Megali; Catalán, Núria; Condon, Jason; Finlayson, C. Max; Grossart, Hans‐Peter; Howitt, Julia; Oliveira, Ernandes Sobreira; Keller, Philipp S.; Koschorreck, Matthias; Laas, Alo; Leigh, Catherine; Marcé, Rafael; Mendonça, Raquel; Muniz, Claumir César; Obrador, Biel; Onandía, Gabriela; Raymundo, Diego; Reverey, Florian; Roland, Fábio; Rõõm, Eva-Ingrid; Sobek, Sebastian; Schiller, Daniel von; Wang, Haijun; Kosten, Sarian

doi:10.1016/j.scitotenv.2021.151925

Cited by 22 publications

(19 citation statements)

References 80 publications

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“…Episodic events can also be the source of large temporal variation such as water level drops in reservoirs (Harrison et al., 2017), storm‐driven drops in hydrostatic pressure (Mattson & Likens, 1990) or increases in wind shear stress (Joyce & Jewell, 2003). In connection to seasonal or occasional water level drops, it was found that dry falling bed sediments tend to emit CH 4 at lower rates than when inundated, but are still a stronger source than upland soils (Paranaiba et al., 2022). For rivers, elevated discharge can lead to higher methane fluxes, especially in small high‐gradient streams where methane is sourced predominantly from groundwater (Natchimuthu, Sundgren, et al., 2017; Natchimuthu, Wallin, et al., 2017).…”

Section: Inland Water Ch4 Budgetmentioning

confidence: 99%

Inland Water Greenhouse Gas Budgets for RECCAP2: 1. State‐Of‐The‐Art of Global Scale Assessments

Lauerwald

Allen

Deemer

et al. 2023

Global Biogeochemical Cycles

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Inland waters are important emitters of the greenhouse gasses (GHGs) carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) to the atmosphere. In the framework of the 2nd phase of the REgional Carbon Cycle Assessment and Processes (RECCAP‐2) initiative, we review the state of the art in estimating inland water GHG budgets at global scale, which has substantially advanced since the first phase of RECCAP nearly 10 years ago. The development of increasingly sophisticated upscaling techniques, including statistical prediction and process‐based models, allows for spatially explicit estimates that are needed for regionalized assessments of continental GHG budgets such as those established for RECCAP. A few recent estimates also resolve the seasonal and/or interannual variability in inland water GHG emissions. Nonetheless, the global‐scale assessment of inland water emissions remains challenging because of limited spatial and temporal coverage of observations and persisting uncertainties in the abundance and distribution of inland water surface areas. To decrease these uncertainties, more empirical work on the contributions of hot‐spots and hot‐moments to overall inland water GHG emissions is particularly needed.

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Section: Inland Water Ch4 Budgetmentioning

confidence: 99%

Inland Water Greenhouse Gas Budgets for RECCAP2: 1. State‐Of‐The‐Art of Global Scale Assessments

Lauerwald

Allen

Deemer

et al. 2023

Global Biogeochemical Cycles

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“…2. Since our literature review, several notable studies examining GHG fluxes from dry inland waters have been published (e.g., Arce et al, 2023;Bretz et al, 2021;DelVecchia et al, 2021;Koschorreck et al, 2022;Paranaíba et al, 2021;Pinto et al, 2021;Schreckinger et al, 2022). However, there is still a marked shortage of studies on GHG fluxes from isolated pools in IRES, with most studies focused on dry sediments (Bonada et al, 2020).…”

Section: Future Re S E Arch D Irec Ti On Smentioning

confidence: 99%

“…A recent study of forest drainage ditches found similarly low dry condition CH 4 fluxes (on average a mean flux of 0), which were significantly lower than lotic fluxes (Peacock et al, 2021). Likewise, CH 4 fluxes from reservoir drawdown areas are presently considered of minor importance compared to total aquatic CO 2 and CH 4 fluxes from reservoirs (Keller et al, 2021; Paranaíba et al, 2021). However, some studies have demonstrated the potential for sediment in drawdown areas to be CH 4 sources (Amorim et al, 2019; Kosten et al, 2018; Paranaíba et al, 2021; Serça et al, 2016).…”

Section: Greenhouse Gas Fluxes In Intermittent Riversmentioning

confidence: 99%

“…These impacts are in many ways parallel to those posed by drying, where we observe a spatial and temporal mosaic of dry, lentic and lotic reaches (Datry, Larned, & Tockner, 2014). Global dry inland waters represent a significant source of CO 2 and methane (CH 4 ) emissions (Keller et al, 2020; Marcé et al, 2019; Paranaíba et al, 2021). Additionally, enhanced CO 2 emissions have been observed upon the rewetting of riverbed sediments and leaf litter accumulated in dry reaches (Datry et al, 2018; Gallo et al, 2014; von Schiller et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Greenhouse gas dynamics in river networks fragmented by drying and damming

Silverthorn,

López‐Rojo,

Foulquier

et al. 2023

Freshwater Biology

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River fragmentation by drying and damming is occurring more frequently in the Anthropocene era, yet there is limited knowledge of how this fragmentation influences greenhouse gas (GHG) fluxes in river networks. River networks have the potential to be important sources of GHGs to the atmosphere through both similar and dissimilar mechanisms associated with temporary (drying) and permanent (damming) fragmentation. We conducted a review of the literature and found 49, 43 and six studies about GHGs (CO2, CH4 and N2O) in rivers impacted by damming, drying and their interaction, respectively. We found research lacking in non‐arid climates and in small water‐retention structures for studies regarding drying and damming, respectively. The major factors directly influencing GHG fluxes in river networks impacted by drying were sediment moisture, temperature, organic matter content and texture. In networks impacted by damming, the most influential factors were water temperature, dissolved oxygen, and phytoplankton Chlorophyll‐a. Based on our literature review and meta‐ecosystem theory, we propose that the spatial distribution of fragmentation strongly influences GHG fluxes at the river‐network scale. The actionable future research directions identified here will help to improve our understanding of the effects of fragmentation by drying and damming on GHG fluxes, with the potential to inform river management and climate change mitigation strategies.

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“…CH 4 emissions exhibit an extreme intra-reservoir spatial patchiness (Maeck et al 2013 and unpredictable timing (McGinnis et al 2006), which make an accurate quantification of ecosystem CH 4 fluxes difficult. Moreover, the so-called drawdown areas of reservoirs, where sediment is exposed to the atmosphere due to water-level fluctuations, have been pointed out as a widespread significant source of CO 2 (Marcé et al 2019, Almeida et al 2019a, Keller et al 2021 and a potential source of CH 4 (Yang et al 2014, Serça et al 2016, Paranaíba et al 2022. The third and last stage is the decommissioning, which includes the C fluxes associated to the dismantling of the infrastructure (Pacca 2007).…”

Section: Introductionmentioning

confidence: 99%

Integrated assessment of the net carbon footprint of small hydropower plants

Gómez‐Gener

Gubau

Schiller

et al. 2023

Environ. Res. Lett.

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Global assessments evaluating greenhouse gas emissions and climate benefits of hydropower rely on life cycle assessments (LCAs). However, small hydropower plants (i.e., installations with less than 10 MW; SHPs), are largely underrepresented in such schemes, despite their widespread proliferation and well known ecological concerns. Here we quantified, partitioned, and compared the net carbon (C) footprint of four temperate SHPs with different operation designs over a 100-year time horizon. In contrast with previous hydropower LCAs studies, we followed an integrative net C footprint approach accounting for all potential sources and sinks of C within the life cycle of the studied SHPs, including both biogenic and non-biogenic sources, as well as for the pre- and post-impoundment stages involved in the flooding of a reservoir. We found that the areal and system-level C emissions were mostly driven by the residence time of the impounded water, which in turn was linked to the SHP operation type. The power installed in the SHPs did not have a relevant role on the net C fluxes. Accordingly, SHPs with smaller water storage capacity were almost neutral in terms of the C footprint. In contrast, SHPs with water storage facilities prolonged the water residence time in the reservoir and either acted as a source or sink of C. The long water residence time in these SHPs promoted either emission of biogenic gases from the surface or C storage in the sediments. Our work shows that integrative net C footprint assessments accounting for different operation designs are necessary to improve our understanding of the environmental effects of SHPs.

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Cross-continental importance of CH4 emissions from dry inland-waters

Cited by 22 publications

References 80 publications

Inland Water Greenhouse Gas Budgets for RECCAP2: 1. State‐Of‐The‐Art of Global Scale Assessments

Inland Water Greenhouse Gas Budgets for RECCAP2: 1. State‐Of‐The‐Art of Global Scale Assessments

Greenhouse gas dynamics in river networks fragmented by drying and damming

Integrated assessment of the net carbon footprint of small hydropower plants

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