RT journal article
T1 Distribution, reactivity and vertical fluxes of methane in the Guadalquivir Estuary (SW Spain)
A1 Sánchez Rodríguez, Jairo
A1 Ortega Díaz, Teodora
A1 Sierra Padilla, Ana
A1 Mestre Durán, Miriam
A1 Ponce Alonso, María del Rocío
A1 Fernández Puga, María del Carmen
A1 Forja Pajares, Jesús
A2 Química Física
K1 Benthic fluxes
K1 Guadalquivir Estuary
K1 Methane oxidation
K1 Methane variability
K1 Water-atmosphere fluxes
AB The influence of temperature, salinity, sediment-water-atmosphere exchanges and oxidation rate on the variability of methane (CH4) in the Guadalquivir Estuary has been studied. The database corresponds to 3 intensive samplings carried out in summer (2021 and 2022) and winter (2022). An increase in CH4 concentration towards the interior of the estuary has been observed, more intense during summer (19–371 nmol L−1). The influence of temperature and salinity on the variability of CH4 concentration is negligible, with contributions below 1 nmol L−1. Water-atmosphere fluxes increase inland in summer (28–574 μmol m−2 d−1), being generally higher than in winter (18–80 μmol m−2 d−1). Similarly, benthic fluxes remain relatively constant in winter (10 ± 6 μmol m−2 d−1) and increase inland in summer (7–212 μmol m−2 d−1). In the innermost station of the estuary, with salinities lower than 1, there is a significant increase in benthic fluxes, with values above 9000 μmol m−2 d−1. CH4 oxidation rates increase towards low salinities, being especially high in summer (489 nmol L−1 d−1). Based on the information obtained, CH4 variability in the Guadalquivir Estuary is mainly controlled by water-atmosphere fluxes, benthic fluxes and oxidation in the water column. The uncertainty associated with the quantification of these processes does not allow an adequate assessment of the influence of lateral inputs, although there is experimental evidence of their importance in the Guadalquivir.
PB Elsevier B.V.
SN 1879-1026
YR 2024
FD 2024
LK http://hdl.handle.net/10498/32284
UL http://hdl.handle.net/10498/32284
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 07-nov-2026