Ensemble of models shows coherent response of a reservoir's stratification and ice cover to climate warming

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

Abstract

Water temperature, ice cover, and lake stratification are important physical properties of lakes and reservoirs that control mixing as well as bio-geo-chemical processes and thus influence the water quality. We used an ensemble of vertical one-dimensional hydrodynamic lake models driven with regional climate projections to calculate water temperature, stratification, and ice cover under the A1B emission scenario for the German drinking water reservoir Lichtenberg. We used an analysis of variance method to estimate the contributions of the considered sources of uncertainty on the ensemble output. For all simulated variables, epistemic uncertainty, which is related to the model structure, is the dominant source throughout the simulation period. Nonetheless, the calculated trends are coherent among the five models and in line with historical observations. The ensemble predicts an increase in surface water temperature of 0.34 K per decade, a lengthening of the summer stratification of 3.2 days per decade, as well as decreased probabilities of the occurrence of ice cover and winter inverse stratification by 2100. These expected changes are likely to influence the water quality of the reservoir. Similar trends are to be expected in other reservoirs and lakes in comparable regions.

Details

Original languageEnglish
Article number50
JournalAquatic sciences : research across boundaries / publ. by the Swiss Federal Institute of Aquatic Science and Technology, EAWG
Volume84
Issue number4
Publication statusPublished - Oct 2022
Peer-reviewedYes

External IDs

Scopus 85137048775
Mendeley 2c1c8321-c782-3eba-acb2-de215e10b068
unpaywall 10.1007/s00027-022-00883-2

Keywords

Research priority areas of TU Dresden

    DFG Classification of Subject Areas according to Review Boards

      Sustainable Development Goals

      Keywords

      • Water temperature trend, Climate warming, Stratification, Ice cover, Model ensemble