Oxygen Isotope Fractionation of O₂ Consumption through Abiotic Photochemical Singlet Oxygen Formation Pathways.

ABSTRACT: Oxygen isotope ratios of O₂ are important tracers for assessing biological activity in biogeochemical processes in aquatic environments. In fact, changes in the ¹⁸O/¹⁶O and ¹⁷O/¹⁶O ratios of O₂ have been successfully implemented as measures for quantifying photosynthetic O₂ production and biological O₂ respiration. Despite evidence for light-dependent O₂ consumption in sunlit surface waters, however, photochemical O₂ loss processes have so far been neglected in the stable isotope-based evaluation of oxygen cycling. Here, we established the magnitude of the O isotope fractionation for abiotic photochemical O₂ elimination through formation of singlet O₂, ^1<

SUBMITTER: Pati SG 

PROVIDER: S-EPMC11926750 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature