caa a22 4500 465762085 CHVBK 20180323111902.0 cr unu---uuuuu 170327e19900901xx s 000 0 eng 10.1007/BF00877283 doi (NATIONALLICENCE)springer-10.1007/BF00877283 Vertical mixing in Überlinger See, western part of Lake Constance [Elektronische Daten] [Gerhard Heinz, Johann Ilmberger, Michael Schimmele] Depth variable vertical eddy diffusion coefficients for heat (K z) were calculated from continuously measured temperature profiles in Überlinger See (western part of Lake Constance). The temperatures were averaged over vertical intervals of 10 m yielding 14 discrete values (maximum depth of Überlinger See: 147 m). A linear fit from 10 June to 29 September 1987 was used to smooth the significant temperature fluctuations caused by internal seiches of Lake Constance. Assuming horizontal homogeneity for the smoothed data the Gradient-Flux-Method was applied to compute vertical diffusion coefficientsK z at different depths using the depth variable volumes and surfaces of the 14 layers. The resulting mean diffusion coefficients for the period from June to September are 0.04 cm2/s near the thermocline and up to 0.8 cm2/s in deeper strata (accuracy: ± 50%). It is shown that horizontal mixing between Überlinger See and Obersee (main lake) alters the computation ofK z by less than 50%. A relationship betweenK z and stability (Brunt-Väisälä) frequencyN is found which corresponds well to the theory of internal wave induced turbulence. Combining the diffusion coefficients with measured phosphorus profiles, a phosphorus flux from the hypolimnion to the epilimnion of (0.7 ± 0.4) mg P m−2 d−1 was calculated, corresponding to about 20% of the average external loading per area of Lake Constance in 1986. Birkhäuser Verlag, 1990 Vertical mixing nationallicence stratification nationallicence phosphorus nationallicence Lake Constance nationallicence Heinz Gerhard Institut für Umweltphysik, Im Neuenheimer Feld 366, D-6900, Heidelberg, Germany aut Ilmberger Johann Institut für Umweltphysik, Im Neuenheimer Feld 366, D-6900, Heidelberg, Germany aut Schimmele Michael Institut für Umweltphysik, Im Neuenheimer Feld 366, D-6900, Heidelberg, Germany aut Aquatic Sciences Birkhäuser-Verlag 52/3(1990-09-01), 256-268 1015-1621 52:3<256 1990 52 27 https://doi.org/10.1007/BF00877283 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00877283 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Heinz Gerhard Institut für Umweltphysik, Im Neuenheimer Feld 366, D-6900, Heidelberg, Germany aut NATIONALLICENCE 700 1- Ilmberger Johann Institut für Umweltphysik, Im Neuenheimer Feld 366, D-6900, Heidelberg, Germany aut NATIONALLICENCE 700 1- Schimmele Michael Institut für Umweltphysik, Im Neuenheimer Feld 366, D-6900, Heidelberg, Germany aut NATIONALLICENCE 773 0- Aquatic Sciences Birkhäuser-Verlag 52/3(1990-09-01), 256-268 1015-1621 52:3<256 1990 52 27 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer