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Journal Article

Trend analysis of weekly temperatures and oxygen concentrations during summer stratification in Lake Plusssee: A long-term study


Mueller-Navarra,  Doerthe C.
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Roesner, R., Mueller-Navarra, D. C., & Zorita, E. (2012). Trend analysis of weekly temperatures and oxygen concentrations during summer stratification in Lake Plusssee: A long-term study. LIMNOLOGY AND OCEANOGRAPHY, 57(5), 1479-1491. doi:10.4319/lo.2012.57.5.1479.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0017-C54C-D
Small dimictic Lake Plusssee in North Germany experienced major changes of the temperature and oxygen regime from 1969 to 2006, which reflected regional and large-scale changes in meteorological forcing. We used long-term weekly measurements of the lake's epilimnetic, metalimnetic, and hypolimnetic temperatures and dissolved oxygen concentrations and meteorological forcing variables to estimate long-term trends for each week. Except for large warming trends of air temperatures in the last week of April (0.14 degrees C yr(-1)) and the first week of May (0.11 degrees C yr(-1)), the extent of epilimnetic warming trends during the same time period (similar to 0.06-0.08 degrees C yr(-1)) was also caused by a cumulative effect resulting from an earlier onset of stratification. Negative hypolimnetic temperature trends at the same time (similar to 0.01 degrees C yr(-1)) also resulted from an earlier onset of stratification and increased water-column stability in spring. In summer and autumn, large increases in epilimnetic temperature and water-column stability were also affected by a shift of the timing of the yearly maxima of epilimnetic temperatures and water-column stability, which resulted in a later breakdown of stratification. This annual pattern of long-term trends of epilimnetic and hypolimnetic temperatures agrees with models driven by the expected increase of air temperatures due to anthropogenic greenhouse gases. Due to a prolonged stratification period, oxygen concentrations during the last weeks of the stratified period were lower, although oxygen concentrations in the water column increased within the first weeks of stratification.