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Journal Article

Temporal and spatial scales of water temperature variability as an indicator for mixing in a polymictic lake

Authors

Schmidt,  S. R.
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/persons/resource/Dieter.Gerten

Gerten,  Dieter
Potsdam Institute for Climate Impact Research;

Hintze,  T.
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Lischeid,  G.
External Organizations;

Livingston,  D. M.
External Organizations;

Adrian,  R.
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Citation

Schmidt, S. R., Gerten, D., Hintze, T., Lischeid, G., Livingston, D. M., Adrian, R. (2018): Temporal and spatial scales of water temperature variability as an indicator for mixing in a polymictic lake. - Inland Waters, 8, 1, 82-95.
https://doi.org/10.1080/20442041.2018.1429067


Cite as: https://publications.pik-potsdam.de/pubman/item/item_22337
Abstract
We applied coarse spectral analysis to more than 2 decades of daily near-surface water temperature (WT) measurements from Müggelsee, a shallow polymictic lake in Germany, to systematically characterize patterns in WT variability from daily to yearly temporal scales. Comparison of WT with local air temperature indicates that the WT variability patterns are likely attributable to both meteorological forcing and internal lake dynamics. We identified seasonal patterns of WT variability and showed that WT variability increases with increasing Schmidt stability, decreasing Lake number and decreasing ice cover duration, and is higher near the shore than in open water. We introduced the slope of WT spectra as an indicator for the degree of lake mixing to help explain the identified temporal and spatial scales of WT variability. The explanatory power of this indicator in other lakes with different mixing regimes remains to be established.