Articles | Volume 18, issue 15
Biogeosciences, 18, 4535–4548, 2021
https://doi.org/10.5194/bg-18-4535-2021
Biogeosciences, 18, 4535–4548, 2021
https://doi.org/10.5194/bg-18-4535-2021
Research article
04 Aug 2021
Research article | 04 Aug 2021

How are oxygen budgets influenced by dissolved iron and growth of oxygenic phototrophs in an iron-rich spring system? Initial results from the Espan Spring in Fürth, Germany

Inga Köhler et al.

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Short summary
We investigated how high Fe(II) levels influence the O2 budget of a circum-neutral Fe(II)-rich spring and if a combined study of dissolved O (DO) and its isotopic composition can help assess this effect. We showed that dissolved Fe(II) can exert strong effects on the δ18ODO even though a constant supply of atmospheric O2 occurs. In the presence of photosynthesis, direct effects of Fe oxidation become masked. Critical Fe(II) concentrations indirectly control the DO by enhancing photosynthesis.
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