RT Conference Proceedings
T1 Carbon fluxes from water surface and dry sediments in a Mediterranean reservoir
A1 Montes-Pérez, Jorge
A1 Pozzo-Pirotta, Leonardo
A1 Conejo-Orosa, Teresa
A1 Marcé Romero, Rafael
A1 Escot, Carmelo
A1 Reyes, Isabel
A1 Rodríguez, Jaime
A1 Rodríguez Martínez, Valeriano
A1 Moreno-Ostos, Enrique
A1 Sammartino, Simone
A1 Obrador Sala, Biel
K1 Ecología
K1 Geología
K1 Reservas naturales
K1 Mar Mediterraneo
K1 Sedimentación
AB The significant role of reservoirs in the carbon cycling and the recent growth of dam building have increasedthe interest to evaluate carbon fluxes in these systems. In this work, we study the spatial and temporalvariability in CO₂ (diffusive) and CH₄ (diffusive and ebullitive) fluxes from the water surface in a Mediterraneanreservoir (El Gergal, Spain). During a whole year, CO₂ and CH₄ fluxes were measured monthly from thereservoir lacustrine and riverine zone. Additionally, we measured CO₂ flux from dry sediments of the reservoirdrawdown area. CO₂ and CH₄ diffusive fluxes from the water surface were higher during mixing period, andthe CO₂ flux was related to pH and Chl-a, suggesting primary production as a relevant driver. Conversely, CH₄ebullitive flux was higher during thermal stratification. Dry exposed sediments constituted a net CO₂ sourceto the atmosphere showing higher CO₂ emissions in areas influenced by river or intermittent streamdischarges. During the mixing period, the reservoir water surface was a net source of CO₂ to atmospherewhereas it was a CO₂ sink during the stratification period. However during the stratification period thereservoir drawdown zone increased due to lower water input and larger water demand, and consequentlylarger areas of previously submerged sediments became dry and exposed to the atmosphere. Therefore,ecosystem net CO₂ uptake during the thermally stratified period could be significantly diminished inMediterranean reservoirs in future conditions, due to the predicted increase in the frequency and intensityof droughts expected for this region.
PB European Federation of Freshwater Sciences
YR 2021
FD 2021
LK https://hdl.handle.net/10630/22840
UL https://hdl.handle.net/10630/22840
LA eng
NO Montes-Pérez et al., 2021
NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 19 ene 2026