Modelling thermal stratification and calcite precipitation of Lake Belau (northern Germany)

Schernewski, Gerald; Theesen, Lars; Kerger, Kurt E.

doi:10.1016/0304-3800(94)90037-x

Cited by 12 publications

(1 citation statement)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the temperature in the epilimnion drops below the temperature of the water just beneath, the water column is unstable and the thermocline descends, decreasing the temperature (Gorham and Boyce 1989;Octavio et al 1977). Modelling studies in Lake Belau, in Germany, underline the sensitivity of the processes within the lake, like thermal stratification and calcite precipitation to wind mixing (Schernewski et al 1994). Westerlies (positive values in zonal wind components) are the prevailing winds in mid-latitude Europe (Slonosky et al 2000) and, as is shown in the wind rose (Fig.…”

Section: Discussionmentioning

confidence: 83%

Chrysophyte cyst-inferred variability of warm season lake water chemistry and climate in northern Poland: training set and downcore reconstruction

et al. 2014

View full text Add to dashboard Cite

Chrysophyte cyst assemblages from sediment trap and surface sediment samples of 50 lakes in northern Poland were related to environmental variables using multivariate numerical analyses (DCA, CCA). Water electric conductivity, total nitrogen, total phosphorous, turbidity, and cation and anion compositions (Ca 2? , HCO 3-) accounted for significant and independent variations in the chrysophyte cyst assemblages. The first canonical axis was related to the gradient of Ca 2? while the second axis was correlated with total nitrogen. A quantitative transfer function was then developed to estimate Ca 2? (log 10 transformed) from modern chrysophyte cyst assemblages using weighted-averaging regression with classical deshrinking. The bootstrapped regression coefficient (R 2 boot) was 0.68, with a root-mean square error of prediction of 0.143 (log 10 units). The calibration model was applied to a varved sedimentary sequence (AD 1898-2010) from Lake _ Zabińskie, Masurian Lakeland (NE Poland). Observational data from this lake show that the Ca 2? variability in the epilimnion depends on the efficiency of Ca 2? scavenging by CaCO 3 precipitation in early summer, which in turn is a function of water column stratification, temperature and the wind regime from late spring to early fall. The spring-fall wind regime drives the water column mixing. In Lake _ Zabińskie, cyst-inferred warm-season lake water Ca 2? concentrations are significantly negatively correlated with calcite precipitation (CaCO 3 concentrations in sediments; R =-0.49, p adj \ 0.001; AD 1898-2010; 3-year filtered), and cyst-inferred lake water Ca 2? concentrations are significantly correlated with zonal wind speed (m s-1) (R = 0.50; p adj \ 0.001; AD 1898-2010; 3-year filtered). This study demonstrates that chrysophyte cyst assemblages in Polish lakes respond to hydrochemical factors driven by climate variability.

show abstract

Section: Discussionmentioning

confidence: 83%