<abstract xmlns="http://www.w3.org/1999/xhtml">Lake Śniardwy is the largest among more than 7000 Polish lakes. So far, it has not been a subject of detailed investigations concerning long-term changes in water temperature or ice regime. A considerable change in thermal and ice conditions has been observed in the period 1972–2019. Mean annual water temperature increased by 0.44°C dec−1 on average, and was higher than an increase in air temperature (0.33°C dec−1). In the monthly cycle, the most dynamic changes occurred in April (0.77°C dec−1). In the case of ice cover, it appeared increasingly later (5.3 days dec−1), and disappeared earlier (3.0 days dec−1). The thickness of ice cover also decreased (2.4 cm dec−1). Statistical analysis by means of a Pettitt test showed that the critical moment for the transformations of the thermal and ice regime was the end of the 1980’s. In addition to the obvious relations with air temperature for both characteristics, it was evidenced that the occurrence of ice cover depended on wind speed and snow cover. The recorded changes in the case of Lake Śniardwy are considered unfavourable, and their consequences will affect the course of physical, chemical, and biological processes in the largest lake in Poland.</abstract>

Lake Śniardwy is the largest among more than 7000 Polish lakes. So far, it has not been a subject of detailed investigations concerning long-term changes in water temperature or ice regime. A considerable change in thermal and ice conditions has been observed in the period 1972–2019. Mean annual water temperature increased by 0.44°C dec−1 on average, and was higher than an increase in air temperature (0.33°C dec−1). In the monthly cycle, the most dynamic changes occurred in April (0.77°C dec−1). In the case of ice cover, it appeared increasingly later (5.3 days dec−1), and disappeared earlier (3.0 days dec−1). The thickness of ice cover also decreased (2.4 cm dec−1). Statistical analysis by means of a Pettitt test showed that the critical moment for the transformations of the thermal and ice regime was the end of the 1980’s. In addition to the obvious relations with air temperature for both characteristics, it was evidenced that the occurrence of ice cover depended on wind speed and snow cover. The recorded changes in the case of Lake Śniardwy are considered unfavourable, and their consequences will affect the course of physical, chemical, and biological processes in the largest lake in Poland.

Effect of climate warming on a change in thermal and ice conditions in the largest lake in Poland – Lake Śniardwy

Department of Hydrology and Water Management

Faculty of Environmental Engineering and Spatial Management

Journal of Hydrology and Hydromechanics

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Lake Śniardwy is the largest among more than 7000 Polish lakes. So far, it has not been a subject of detailed investigations concerning long-term changes in...

Effect of climate warming on a change in thermal and ice conditions in the largest lake in Poland – Lake Śniardwy

Published Online: Aug 10, 2020

Page range: 260 - 270

Received: Apr 16, 2020

Accepted: Jun 25, 2020

DOI: https://doi.org/10.2478/johh-2020-0024

Keywords
Lakes, Water temperature, Air temperature, Ice cover, Climate change, Central Europe

© 2020 Mariusz Ptak et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Effect of climate warming on a change in thermal and ice conditions in the largest lake in Poland – Lake Śniardwy

Published Online: Aug 10, 2020

Page range: 260 - 270

Received: Apr 16, 2020

Accepted: Jun 25, 2020

DOI: https://doi.org/10.2478/johh-2020-0024

KeywordsLakes, Water temperature, Air temperature, Ice cover, Climate change, Central Europe

© 2020 Mariusz Ptak et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Lakes, Water temperature, Air temperature, Ice cover, Climate change, Central Europe