Publication Details

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DOI / URL link
Title (Primary) Oxygen ebullition from lakes
Author Koschorreck, M.; Hentschel, I.; Boehrer, B.;
Journal Geophysical Research Letters
Year 2017
Department SEEFO;
Volume 44
Issue 18
Language englisch;
POF III (all) T31;
Supplements https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1002%2F2017GL074591&attachmentId=2172779040
Keywords oxygen; lake; NEP; ebullition; bubbles
UFZ wide themes RU2;
Abstract The exchange of oxygen between lakes and the atmosphere is assumed to be driven by diffusion. Here we show that lakes can emit significant amounts of O2 by emerging gas bubbles - a process called ebullition. We found very high proportions of 17±10 % O2 (maximum34 %) in emerging gas bubbles in two shallow eutrophic reservoirs. In the studied reservoirs, O2 emission by ebullition was of similar magnitude as diffusive O2 fluxes. By re-analyzing previous studies we show that the process is ubiquitous and probably quantitatively relevant in many places. We present evidence that O2 in bubbles originates both from photosynthetic oxygen production and hence bubble formation in the oxic water as well as from stripping by emerging methane bubbles. Ebullition can turn lakes under saturated in respect to the atmosphere into a net O2 source. Neglecting O2 ebullition leads to an over estimation of lake internal respiration.
ID 19235
Persistent UFZ Identifier http://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=19235
Koschorreck, M., Hentschel, I., Boehrer, B. (2017):
Oxygen ebullition from lakes
Geophys. Res. Lett. 44 (18), 9372 - 9378