Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1029/2022GB007647
Lizenz creative commons licence
Titel (primär) Oxygen dependent temperature regulation of benthic fluxes in reservoirs
Autor Dadi, T.; Friese, K.; Wendt-Potthoff, K.; Marcé, R.; Koschorreck, M.
Journal / Serie Global Biogeochemical Cycles
Erscheinungsjahr 2023
Department SEEFO
Band/Volume 37
Heft 4
Seite von e2022GB007647
Sprache englisch
Topic T5 Future Landscapes
Keywords Temperature dependency; Oxygen; Benthic fluxes; Reservoirs; Anoxia; Activation energy
Abstract Temperature and dissolved oxygen concentration are critical factors affecting the exchange of solutes between sediment and water; both factors will be affected by warming of lakes and thereby influence water quality. Temperature and oxygen responses of single solute fluxes are well known, however not much is known about interaction of temperature and oxygen in regulating the balance of different fluxes in the benthic environment. We analyzed benthic flux (mobilization and immobilization) data of various solutes (DOC, CH4, NO3--N, NH4+-N, SRP, SO4-, Fe, Mn, and O2) collected from laboratory incubations of 142 sediment cores from 5 different reservoirs incubated under varying in-situ temperature and oxygen conditions. Oxygen was the primary driver of benthic fluxes while temperature and total organic content were secondary. Temperature effects on benthic fluxes were stronger under anoxic conditions which imply that warming will substantially increase the benthic fluxes if the sediment surface becomes anoxic. The varying temperature response of processes underlying the studied fluxes will result in a shift of their relative importance in the benthic environment especially in shallow lakes that are more vulnerable to warming. For example more anoxic conditions will shift the equilibrium between net sulfate reduction and methane release towards the latter. We also predict that physical effects of warming leading to hypolimnetic oxygen depletion i.e. stronger stratification and longer hypolimnetic confinement will increase the benthic mobilization of phosphorus, dissolved organic carbon, and methane into water and immobilization of sulfate by the sediments even in deep lakes.
dauerhafte UFZ-Verlinkung
Dadi, T., Friese, K., Wendt-Potthoff, K., Marcé, R., Koschorreck, M. (2023):
Oxygen dependent temperature regulation of benthic fluxes in reservoirs
Glob. Biogeochem. Cycles 37 (4), e2022GB007647