RT Conference Proceedings
T1 Dark Carbon Uptake in Emerged Sediments: Seasonal and Daily CO2 Flux Patterns in a saline wetland.
A1 Ledesma-Hernández, Guillermo
A1 Rodríguez-Gómez, Sofía
A1 Warren-Jiménez, Paula
A1 Ruiz Nieto, Miriam
A1 Montes-Pérez, Jorge Juan
A1 Conejo-Orosa, Teresa
A1 Moreno-Ostos, Enrique
K1 Carbono - Fijación
K1 Sedimentos (Geología)
K1 Zonas húmedas
AB Inland water bodies are currently shrinking due to alterations of the water cycle, exposingextensive areas of previously submerged sediments to the atmosphere. Consequently, thecarbon cycle is altered, leading to an increased emission of CO2. To study this, we performedmonthly surveys throughout one year to measure CO2 fluxes from dawn to dusk in the calcite-rich emerged sediments of the endorheic saline wetland of La Laguna de Fuente de Piedra,Málaga (Spain). Consistent with existing literature, CO2 emission fluxes predominated inthese sediments. However, at dawn and dusk fluxes were considerably lower, and even CO2uptake into the sediment occurred.Consequently, we conducted three campaigns over a full 24-hour cycle to measure CO2 fluxesin the emerged sediments and their most influential environmental drivers. This approachrevealed a net CO2 emission from the sediment during daylight hours, while a net CO2 uptakeby the sediment was measured during darkness.The magnitude of CO2 fluxes exhibited seasonality with both highest uptake and emissionfluxes in summer, reaching a maximum emission and uptake value of 0.29 g(CO2)m-2h-1 and-0.14 g(CO2)m-2h-1 respectively. In contrast, winter showed the lowest fluxes, with amaximum emission value of 0.04 g(CO2)m-2h-1 and a maximum uptake value of –0.01g(CO2)m-2h-1.Our results reveal that, in addition to seasonal variability of CO2 fluxes magnitude in Fuentede Piedra, a daily trend in CO2 fluxes exists. This trend shows that CO2 emissions fromsediments increase towards midday but decrease towards midnight resulting in CO2 uptake bythe sediment
YR 2024
FD 2024
LK https://hdl.handle.net/10630/32090
UL https://hdl.handle.net/10630/32090
LA eng
NO Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech.
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 21 ene 2026