Publication Details

Reference Category Book chapters
DOI / URL link
Title (Primary) Physical features of meromictic lakes: stratification and circulation
Title (Secondary) Ecology of meromictic lakes
Author Boehrer, B.; von Rohden, C.; Schultze, M.;
Publisher Gulati, R.D.; Zadereev, E.S.; Degermendzhi, A.G.;
Journal Ecological Studies
Year 2017
Department SEEFO;
Volume 228
Language englisch;
POF III (all) T32;
UFZ wide themes RU2;
Abstract Lakes turn meromictic, when mixing and deep recirculation are insufficient to homogenize the water body and remove chemical gradients. A deepwater layer “the monimolimnion ” is excluded from the deep recirculation and hence develops a pronounced different chemical milieu. It persists through all seasons due to its high density. A limited number of processes are known to accomplish such a density increase of the deep water to create meromixis , such as salty inflows and partial deepwater renewal . However, also geochemical processes, such as decomposition of organic material, iron oxidation, and redissolution and calcite precipitation, can be responsible for meromixis. Other than the overlying water layer “the mixolimnion, ” the monimolimnion does not get into direct contact with the atmosphere and hence is not directly supplied with oxygen. Other substances can be enriched by precipitation and flocculation from the mixolimnion until the solubility product is reached or gas pressure grows beyond absolute pressure. As a consequence, the composition of solutes deviates clearly from usual water composition, and quantitative approaches for density must implement appropriate numerical approaches. The permanent density stratification limits the vertical transport of water and solutes. In several lakes, double-diffusive convection has been reported to significantly enhance the vertical solute transport.
ID 18480
Persistent UFZ Identifier
Boehrer, B., von Rohden, C., Schultze, M. (2017):
Physical features of meromictic lakes: stratification and circulation
In: Gulati, R.D., Zadereev, E.S., Degermendzhi, A.G. (eds.)
Ecology of meromictic lakes
Ecological Studies 228
Springer, Berlin, Heidelberg, New York, p. 15 - 34