Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1029/2022GB007647 |
Licence  |
|
| Title (Primary) | Oxygen dependent temperature regulation of benthic fluxes in reservoirs |
| Author | Dadi, T.; Friese, K.; Wendt-Potthoff, K.
; Marcé, R.; Koschorreck, M. |
| Source Titel | Global Biogeochemical Cycles |
| Year | 2023 |
| Department | SEEFO |
| Volume | 37 |
| Issue | 4 |
| Page From | e2022GB007647 |
| Language | englisch |
| Topic | T5 Future Landscapes |
| Supplements | https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2022GB007647&file=2022GB007647-sup-0001-Supporting+Information+SI-S01.docx https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2022GB007647&file=2022GB007647-sup-0002-Data+Set+SI-S01.xlsm |
| 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. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=23867 |
| 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 10.1029/2022GB007647 |
|