Statistical trends of precipitation in chosen climatic station in Slovakia and Libya

This paper deals with the research of monthly precipitation trends in climatic stations in Libya and Slovakia. The non-parametric Mann-Kendall statistic test was applied to detect trends and to assess the significance of the trends in the time series. The evaluation was done for the time period from November to October. Trend analysis of rainfall data series for 1970–2010 did not show any clear trend for Libya as a whole although mainly decrease in precipitation was proved. It is clear that slight climatic changes may have affected the magnitude and timing of the precipitation within the study area. High statistically significant negative values appear in November and high statistically significant positive values appear in January. Trends analysis in precipitation data in eastern Slovakia was carried out in the time period 1981–2010. Data used in the present study were acquired from Slovak Hydrometeorological Institute. Almost all the gauging stations in Slovakia show positive trend of monthly precipitation. The increase of precipitation – significant positive trend – was proved in stations Turňa nad Bodvou, Mníšek nad Hnilcom, Veľký Folkmár. Significant positive trend in precipitation is proved in July. Decreasing trend is demonstrated only in March. Key-Words: Climatic stations, Libya, Mann-Kendall test, monthly precipitation data, Slovakia WSEAS TRANSACTIONS on ENVIRONMENT and DEVELOPMENT Martina Zeleňáková, Pavol Purcz, Helena Hlavatá, Ibrahim Gargar, Maria Manuela Portela E-ISSN: 2224-3496 298 Volume 10, 2014