RESEARCH PAPER
CHANGES IN ICE REGIME OF JAGODNE LAKE (NORTH-EASTERN POLAND)
Bogumił Michał Nowak 1  
,   Mariusz Ptak 2  
,   Mariusz Sojka 3  
 
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1
Institute of Meteorology and Water Management - National Research Institute
2
Uniwersytet im. Adama Mickiewicza w Poznaniu
3
Uniwersytet Przyrodniczy w Poznaniu
CORRESPONDING AUTHOR
Bogumił Michał Nowak   

Institute of Meteorology and Water Management - National Research Institute, Dąbrowskiego 174/176, 60-594 Poznań, Polska
Submission date: 2018-09-19
Final revision date: 2018-11-05
Acceptance date: 2018-11-05
Publication date: 2019-05-23
 
Acta Sci. Pol. Formatio Circumiectus 2019;18(1):89–100
 
KEYWORDS
TOPICS
ABSTRACT
Aim of the study:
Indication of the directions and pace of change in the ice regime of the Jagodne lake in 1975-2015. Analysis of the predictability of the occurrence of ice phenomena in relation to stability and seasonality and understanding the mutual interactions between the parameters describing the ice regime of this lake.

Material and methods:
Data from the Jagodne Małe water station on the Jagodne Lake, concerning: the dates of the beginning and end of ice phenomena, the beginning and end of the ice cover, and the thickness of the ice cover from 1975-2015. Average monthly air temperature from the IMGW-PIB synoptic station in Mikołajki. Statistical analysis based on trend analysis using the non-parametric Mann-Kendall test and the Colwell method.

Results and conclusions:
The research has shown that Jagodne Lake has been characterized by some tendencies to change the ice regime over the last decades. These trends should be identified with the successive shortening of the ice season and the decrease of the thickness of the ice cover. However, these changes in the case of the beginning and end of ice phenomena (including the ice cover) and the thickness of the ice cover are not statistically significant. Only in the case of the duration of ice phenomena, its shortening was observed, which was confirmed by the Mann-Kendell statistical test. The analyzed object reacts in a similar way as most of the lakes for which research was conducted regarding changes in ice. The observed increase in average temperatures in April influenced the shortening of the time of occurrence of icephenomena.

ISSN:1644-0765