Details zur Publikation

Referenztyp Zeitschriften
DOI / URL Link
Titel (primär) Oxygen ebullition from lakes
Autor Koschorreck, M.; Hentschel, I.; Boehrer, B.;
Journal / Serie Geophysical Research Letters
Erscheinungsjahr 2017
Department SEEFO;
Band/Volume 44
Heft 18
Sprache englisch;
POF III (gesamt) T31;
Keywords oxygen; lake; NEP; ebullition; bubbles
UFZ Querschnittsthemen 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
dauerhafte UFZ-Verlinkung
Koschorreck, M., Hentschel, I., Boehrer, B. (2017):
Oxygen ebullition from lakes
Geophys. Res. Lett. 44 (18), 9372 - 9378