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Clase: Tese
Título : Spatial and seasonal variability of diffusive carbon flux in contrasting reservoirs: magnitudes and contribution of the aquatic surface and exposed sediment
Otros títulos : Variabilidade espacial e sazonal dos fluxos difusivos de carbono em reservatórios contrastantes: magnitudes e contribuição da superfície aquática e do sedimento exposto
Autor(es): Teixeira, José Reinaldo Paranaíba Vilela Alves
Orientador: Barros, Nathan Oliveira
Miembros Examinadores: Barbosa, Pedro Maia
Miembros Examinadores: Enrich-Prast, Alex
Miembros Examinadores: Cardoso, Simone Jaqueline
Miembros Examinadores: Amado, André Megali
Resumo: -
Resumen : Reservoirs are globally significant sources of carbon dioxide (CO2) and methane (CH4) to the atmosphere. The patterns of spatial and temporal variability in CO2 and CH4 emission from reservoirs are still poorly studied, especially in tropical regions where hydropower is growing rapidly. We performed spatially resolved measurements of dissolved CO2 and CH4 surface water concentrations and their gas-exchange coefficients (k) to compute diffusive carbon flux from four contrasting tropical reservoirs across Brazil during different hydrological seasons. Diffusive CO2 emissions were higher during the dry season than during the rainy season, whereas there were no consistent seasonal patterns for diffusive CH4 emissions. Our results reveal that the magnitude and the spatial within-reservoir patterns of diffusive CO2 and CH4 flux varied strongly among hydrological seasons. River inflow areas were often characterized by high seasonality in diffusive flux. Areas close to the dam generally showed low seasonal variability in diffusive CH4 flux but high variability in diffusive CO2 flux. Overall, we found that reservoir areas exhibiting highest emission rates (‘hotspots’) shifted substantially across hydrological seasons. Estimates of total diffusive carbon emission from the reservoir surfaces differed between hydrological seasons by a factor up to 7 in Chapéu D’Úvas reservoir, up to 13 in Curuá-Una reservoir, up to 4 in Furnas reservoir, and up to 1.8 in Funil reservoir, indicating that spatially-resolved measurements of gas concentrations and k need to be performed at different hydrological seasons in order to constrain annual diffusive carbon emission.
Palabras clave : Biogeoquímica
Reservatórios
Gases de efeito estufa
CNPq: CNPQ::CIENCIAS BIOLOGICAS
Idioma: eng
País: Brasil
Editorial : Universidade Federal de Juiz de Fora (UFJF)
Sigla de la Instituición: UFJF
Departamento: ICB – Instituto de Ciências Biológicas
Programa: Programa de Pós Graduação em Biodiversidade e Conservação da Natureza
Clase de Acesso: Acesso Aberto
Attribution-NonCommercial-NoDerivs 3.0 Brazil
Licenças Creative Commons: http://creativecommons.org/licenses/by-nc-nd/3.0/br/
DOI: https://doi.org/10.34019/ufjf/te/2021/00004
URI : https://repositorio.ufjf.br/jspui/handle/ufjf/12493
Fecha de publicación : 26-feb-2021
Aparece en las colecciones: Doutorado em Biodiversidade e Conservação da Natureza (Teses)



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