A5067648361- Atmospheric and Environmental Gas Dynamics
- Marine and coastal ecosystems
- Hydrocarbon exploration and reservoir analysis
- Methane Hydrates and Related Phenomena
- Reservoir Engineering and Simulation Methods
- Aquatic Ecosystems and Phytoplankton Dynamics
- Pesticide and Herbicide Environmental Studies
- Microbial Community Ecology and Physiology
- Fish Ecology and Management Studies
- Pharmaceutical and Antibiotic Environmental Impacts
- Water Quality and Pollution Assessment
- Groundwater flow and contamination studies
- Environmental Toxicology and Ecotoxicology
- Soil and Water Nutrient Dynamics
- Weed Control and Herbicide Applications
- Geological and Geophysical Studies
- Aquaculture Nutrition and Growth
- Isotope Analysis in Ecology
- Soil erosion and sediment transport
- Air Quality Monitoring and Forecasting
- Marine Bivalve and Aquaculture Studies
- Hydrology and Watershed Management Studies
- Geography and Environmental Studies
- Peatlands and Wetlands Ecology
- Forensic Entomology and Diptera Studies
Hospital Universitário de Brasília
2025
Universidade Federal de Juiz de Fora
2015-2024
Uppsala University
2015-2019
Radboud University Nijmegen
2019
Universidade Federal do Oeste do Pará
2019
Wageningen University & Research
2014
Universidade Federal do Rio de Janeiro
2012
Burial in sediments removes organic carbon (OC) from the short-term biosphere-atmosphere (C) cycle, and therefore prevents greenhouse gas production natural systems. Although OC burial lakes reservoirs is faster than ocean, magnitude of inland water not well constrained. Here we generate first global-scale regionally resolved estimate modern reservoirs, deriving a comprehensive compilation literature data. We coupled statistical models to area inventories yearly 0.15 (range, 0.06-0.25) Pg C,...
An important question in the context of climate change is to understand how CH4 production regulated anoxic sediments lakes and reservoirs. The type organic carbon (OC) present a key factor controlling at conditions, but studies investigating methanogenic potential main OC types are fragmented. We incubated different allochthonous (alloOC; terrestrial plant leaves) autochthonous (autoOC; phytoplankton two aquatic plants species) an sediment during 130 d. tested if (1) supply fresh alloOC...
Abstract Many inland waters exhibit complete or partial desiccation, have vanished due to global change, exposing sediments the atmosphere. Yet, data on carbon dioxide (CO 2 ) emissions from these are too scarce upscale for estimates understand their fundamental drivers. Here, we present results of a survey covering 196 dry across diverse ecosystem types and climate zones. We show that CO share drivers constitute substantial fraction cycled by waters. were consistent zones, with local...
Abstract Small water systems are important hotspots of greenhouse gas (GHG) emission, but estimates poorly constrained as data scarce. ponds often constructed in urban areas, where they receive large amounts nutrients and therefore tend to be highly productive. Here, we investigated GHG emissions, seasonal diel variation, net ecosystem production (NEP) from an pond. In monthly 24‐h field campaigns during 11 months, diffusive water–atmosphere methane (CH 4 ) carbon dioxide (CO 2 fluxes CH...
The magnitude of diffusive carbon dioxide (CO2) and methane (CH4) emission from man-made reservoirs is uncertain because the spatial variability generally not well-represented. Here, we examine its drivers for partial pressure, gas-exchange velocity (k), flux CO2 CH4 in three tropical using spatially resolved measurements both gas concentrations k. We observed high within all reservoirs, with river inflow areas displaying elevated concentrations. Conversely, close to dam are characterized by...
Recent studies from temperate lakes indicate that eutrophic systems tend to emit less carbon dioxide (CO2) and bury more organic (OC) than oligotrophic ones, rendering them CO2 sinks in some cases. However, the scarcity of data tropical is critical for a complete understanding interplay between eutrophication aquatic (C) fluxes warm waters. We test hypothesis system source both CH4 atmosphere, atmospheric emissions are larger burial OC sediments. This was based on following assumptions: (i)...
Although previous studies suggest that greenhouse gas (GHG) emissions from reservoir sediment exposed to the atmosphere during drought may be substantial, this process has not been rigorously quantified. Here we determined carbon dioxide (CO2) and methane (CH4) cores a drying rewetting cycle. We found strong temporal variation in GHG with peaks when was drained (C permanently wet sediments were, respectively, 251 1646 mg m−2 d−1 for CO2 0.8 547.4 CH4) then again rewetted 456 1725mg 1.3 3.1...
On November 2015, one of Brazil's most important watersheds was impacted by the mine waste from Fundão dam collapse in Mariana. The traveled over 600 km along Doce River before reaching sea, causing severe devastation its way. Here we assessed trace element concentrations and cytogenotoxic effects released waste. Water samples were collected ten days after disaster two sites non-impacted site. Sampling points located hundreds kilometers downstream collapsed dam. used for quantification to...
Abstract The potent greenhouse gas methane (CH 4 ) is readily emitted from tropical reservoirs, often via ebullition (bubbles). This highly stochastic emission pathway varies in space and time, however, hampering efforts to accurately assess total CH emissions water bodies. We systematically studied both the spatial temporal scales of variability a river inflow bay Brazilian reservoir. conducted multiple resolved surveys using hydroacoustic approach supplemented with bubble traps over...
Macrophyte detritus is one of the main sources organic carbon (OC) in inland waters, and it potentially available for methane (CH4) production anoxic bottom waters sediments. However, transformation macrophyte-derived OC into CH4 has not been studied systematically, thus its extent relationship with macrophyte characteristics remains uncertain. We performed decomposition experiments from 10 different species at conditions, presence absence a freshwater sediment, order to relate rate water...
Reservoir sediments exposed to air due water level fluctuations are strong sources of atmospheric carbon dioxide (CO2). The spatial variability CO2 fluxes from these drawdown areas still poorly understood. In a reservoir in southeastern Brazil, we investigated whether emissions vary as function neighboring land cover types and assessed the magnitude relation nearby surface. Exposed near forestland (average = 2733 mg C m−2 day−1) emitted more than grassland 1261 day−1), congruent with...
Substantial amounts of organic matter (OM) from terrestrial ecosystems are buried as sediments in inland waters. It is still unclear to what extent this OM constitutes a sink carbon, and how much it returned the atmosphere upon mineralization carbon dioxide (CO2). The construction reservoirs affects cycle by increasing sedimentation at regional scale. In study we determine sediment three zones (river, transition, dam) tropical hydroelectric reservoir Brazil well identify composition pool...
Abstract. Hydroelectric reservoirs bury significant amounts of organic carbon (OC) in their sediments. Many are characterized by high sedimentation rates, low oxygen concentrations bottom water and a share terrestrially derived OC, all these factors have been linked to efficiency OC burial. However, investigations burial (OCBE, i.e., the ratio between buried deposited OC) limited few studies, none which include spatially resolved analyses. In this study we determined spatial variation OCBE...
Freshwater reservoirs, in particular tropical ones, are an important source of methane (CH4) to the atmosphere, but current estimates uncertain. The CH4 emitted from reservoirs is microbially produced their sediments, at present, rate formation reservoir sediments cannot be predicted sediment characteristics, limiting our understanding emission. Here we show through a long-term incubation experiment that widely different can age and total nitrogen concentration. occurs predominantly layers...
Freshwater reservoirs are important sites of organic carbon (OC) burial, but the extent to which reservoir OC burial is a new anthropogenic sink currently unclear. While aquatic (by, e.g., phytoplankton) in may count as C sink, terrestrial constitutes only if more efficient than other depositional environments. We carried out incubation experiments that mimicked environmental conditions different environments along land-sea continuum (oxic and anoxic freshwater, oxic seawater, river bedload,...
Increased periods of prolonged droughts followed by severe precipitation events are expected throughout South America due to climate change. Freshwater sediments especially sensitive these changing conditions. The increased oscillation water levels in aquatic ecosystems causes enhanced cycles sediment drying and rewetting. Here we experimentally evaluate the effects induced drought a rewetting event on release carbon dioxide (CO2), methane (CH4), nutrients (nitrogen phosphorus), trace...
Abstract An increasing number of rivers is being dammed, particularly in the tropics, and reservoir water surfaces can be a substantial anthropogenic source greenhouse gases. On average, 80% CO 2 ‐equivalent emission reservoirs globally has been attributed to CH 4 , which predominantly emitted via ebullition. Since ebullition highly variable across space time, both measuring upscaling an entire challenging, estimates are therefore not well constrained. We measured at high spatial resolution...