Effect of the North Atlantic Oscillation on the Pattern of Lake Ice Phenology in Poland

2018

E3S Web Conf.

Self Cite

Abstract. The paper presents the analysis of the course of ice phenomena on four lakes (Lednica, Żnińskie Duże, Biskupińskie, Powidzkie) in central Poland in the period 1976-2015. The obtained results show changes in their ice regime that occurred over the last 40 years. An advance of the term of decline of ice cover was determined (by 2.5 day·dec -1 on average for all lakes), as well as a reduction of duration of ice cover (by 4.4 day·dec -1 on average for all lakes), and a decrease in its maximum thickness (by 2 cm·dec -1 on average for all lakes). Such a situation should be associated with the observed warming, as confirmed by the course of air temperature for station Gniezno, where in the period of the winter half-year (November-April), an increase in temperature was recorded by 0.37°C·dec -1 .

Section: Resultssupporting

confidence: 79%

Variability and course of occurrence of ice cover on selected lakes of the Gnieźnieńskie Lakeland (Central Poland) in the period 1976–2015

Nowak

2018

E3S Web Conf.

Self Cite

“…The negative dependency between the duration of ice cover and water temperature (Figure 7) suggests that a decrease (reduction) in the former is accompanied by an increase (warming) in the latter. In the case of Poland in spatial terms, ice cover is subject to faster destruction in the western part of the country [60,61]. Considering the analysed lakes, the duration of ice cover is very variable, and in the case of Lake Lubie (in the western part of the area) it averages 55 days, while in the case of Lake Studzieniczne (in the eastern part of the study area) it averages 96 days.…”

Section: Discussionmentioning

confidence: 97%

Effect of Environmental Conditions and Morphometric Parameters on Surface Water Temperature in Polish Lakes

Sojka

Choiński

et al. 2018

Water

Self Cite

The study evaluated the effect of environmental conditions and morphometric parameters on lake water temperature changes. The analysis was carried out on the basis of 14 lakes located in northern Poland. The assessment was based on the daily water and air temperatures from 1972 to 2016. It took into account the location of lakes (latitude, longitude, altitude) morphometric parameters (surface area, maximum and mean depth, volume), hydrological processes (rate of water exchange, course of ice phenomena), and trophic status (water transparency) as factors that can modify lake water temperature changes. Direction and rate of air and water temperature changes were analysed by means of Mann-Kendall's and Sen's tests. Cluster analysis (CA) was applied to group lakes characterised by similar water temperature changes. The effect of climatic and non-climatic parameters on a lake's water temperature was assessed on the basis of principal component analysis (PCA). Water temperatures in the lakes in the years 1972-2016 were characterised by a higher rate of increase of 0.43 • C·dec −1 than the air temperature decrease of 0.34 • C·dec −1 . The analysis showed a faster rate of heating of waters in western Poland. This can be explained by shorter duration of ice cover. Moreover, the changes of water temperature were affected by other factors, including the location of the lakes, their morphometric parameters, wind speed, water transparency and water exchange time.

“…e implementation of protection tasks should involve not only the reduction of supply of pollutants, but also the reduction of the effect of climate changes on an increase in water temperature in rivers, and as a consequence on the worsening of unfavourable physical and chemical water parameters. In the context of the observed climate warming (Wrzesiński et al 2015, Kolář, 2017, Milošević et al 2017, Tomczyk 2017, it is important to develop solutions for a reduction of their negative effect. Measures with a global range are optimal, e.g.…”

Section: Discussionmentioning

confidence: 99%

Long-term temperature fluctuations in rivers of the Fore-Sudetic region in Poland

2018

Geografie

Self Cite

The paper presents an analysis of water temperature fluctuations in four rivers: Nysa Łużycka, Bóbr, Bystrzyca, and Nysa Kłodzka, in south-west Poland (Fore-Sudetic region) in the period 1971–2014. The obtained results show an evident increase in water temperature ranging from 0.15 °C·dec/1 to 0.33 °C·dec/1. Such changes were particularly determined by changes in air temperature. Water temperature increased in two analyzed stations: Zielona Góra and Wrocław by 0.37 and 0.35 °C·dec/1, respectively. While the variability of the rate of warming of particular rivers in the analyzed region should be associated with local factors occurring in the catchments, the contribution of forest cover is of key importance. A change in water temperature constituting its primary parameter will cause further transformation of the discussed river ecosystems. Combined with poor water quality, rising water temperatures can become a factor inhibiting further economic development of the Fore-Sudetic region in Poland.