Leszek Kolendowicz

Changes in Lake Ice Cover on the Morskie Oko Lake in Poland （1971-2007）

Abstract On the basis of data from the period 1971–2007, and by applying trend analysis, a study on formation, disappearance and duration of lake ice cover on the Morskie Oko Lake in the Tatra Mountains in southern Poland was carried out. The results show decreasing trends in the maximum thickness of winter lake ice cover and in duration of lake ice phenomena, while air temperature recorded at the same period at the foot of the Tatra Mountains shows increasing trend. There are strong relationships between the course of lake ice phenomena and air temperature. Citation Choinski, A., L. Kolendowicz, J. Pociask-Karteczka, et al., 2010: Changes in lake ice cover on the Morskie Oko Lake in Poland (1971–2007). Adv. Clim. Change Res., 1 , doi: 10.3724/SP.J.1248.2010.00071.

Heavy thunderstorms on the Polish-German lowlands in the period 1951–2008 and their circulation conditions

Abstract. The aim of the study was an analysis of the impact of atmospheric circulation over the territory of Europe on the frequency of occurrence of heavy thunderstorms on German Lowlands and on Polish Lowlands in the period 1951-2008. The atmospheric circulation in days with investigated phenomena was illustrated as the averaged image of the atmospheric pressure field over Europe (sea level pressure and 500 hPa geopotential heights). Heavy thunderstorm phenomena occur as a result of low pressure systems or low pressure troughs moving above investigated area and bringing cold air masses. Usually, the distribution of isobars at sea level indicates the occurrence of atmospheric fronts accompanying a low pressure system.

Thermal and Humidity Conditions Over a Salient Land Form as Exemplified by a Coastal Sand Dune at the Łeba Sandbar in the Słowiński National Park

Abstract In July 2011, measurements were taken of selected meteorological elements in the central part of the Łeba Sandbar in the Słowiński National Park. On the basis of the results of measurements performed at five points located on a salient land form in close proximity to the seashore, a thermal and humidity characteristics of this form were determined for a twenty-four hour period. The results of measurements obtained from an automatic weather station located in an open area, near the measurement points on the coastal sand dune, were used as information on the atmospheric conditions predominant in the standard area (flat area covered by grass). The research analysis was performed for the entire measurement period and for days with radiational weather. The authors also determined the dependence between air temperature and humidity values observed over the analysed land form and the values of weather elements measured over the standard area.

Topoclimatic differentiation of the area of the Słowiński National Park, northern Poland

Topoclimatic differentiation of the area of the Słowiński National Park, northern Poland The primary objective of the study was to elaborate a synthetic topoclimatic map of the area of the Słowiński National Park (SNP). The spatial scopes of individual types of topoclimate were distinguished using the method proposed by Paszyński (1999). Pursuant to this method, the topoclimatic classification - and subsequently topoclimatic charting - is performed on the basis of an analysis of the exchange of energy between the atmosphere and its base. The research conducted allowed us to determine that the SNP contains 12 types of local climate, and also to designate the spatial scopes thereof.

Daily course of the soil temperature in summer in chosen ecosystems of Słowiński National Park, northern Poland

Daily course of the soil temperature in summer in chosen ecosystems of Słowiński National Park, northern Poland Patterns of the daily changes of the soil temperature in summer at three different ecosystems within the Słowiński National Park were analyzed. Strong correlation between the solar radiation and the soil temperature was found, particularly for the bare sandy surfaces, while the plant and humus cover hampers the solar energy flux to the soil. In the same way, correlations between the temperature of soil surface and the air temperature were computed. Finally, logarithmic models for the relationship between the global solar radiation and the soil surface temperature and between the soil surface temperature and the air temperature were constructed.