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Büche, Thomas (2016): The mixing regime of Lake Ammersee. In: Erde, Vol. 147, No. 4: pp. 275-283
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Climate change affects the circulation of lakes and has already induced mixing regime shifts for several sites on the globe. The pre-alpine Lake Ammersee, Germany, is usually dimictic, but exhibits rarely a complete ice cover. Furthermore, it has potentially shown some monomictic years in the past. Based on vertical pro profile data of water temperatures (WT) and dissolved oxygen (DO) the mixing behavior of the lake was analyzed for the period of 1984-2016. To bridge periods of lacking limnological field data meteorological observations were taken into account and a decision tree was developed to standardize the detection of mixing events and stagnation periods for the study site. The classification of the lake mixing yielded 24 dimictic years and eight monomictic years, which approves the assumption of occasional monomixis in the lake. No evidence of a significant shift in mixing pattern was found. By examining holistic vertical mixing events using the vertical DO distribution, one year without complete overturn (meromictic) was detected. The results indicate that the circulation behavior of Lake Ammersee is marginal between dimictic and monomictic, but no shift in the mixing regime has set in for Lake Ammersee so far.