Application of Mann-Kendall test and the Sen's slope estimates for trend detection in deposition data from Bíly K í (Beskydy Mts., the Czech Republic) 1997--2010

Data from precipitation monitoring station located at Bíly K í in Beskydy Mts. were analyzed in order to find out whether and how the decrease of emissions in the Czech Republic and neighbouring countries is reflected in the composition of precipitation. Statistically significant decrease of mean annual concentrations of Zn, Pb, Cd, Ni, Fe in bulk precipitation and of H+, K+, Mg2+, Ca2+, NO3-, SO4-, Cl- and conductivity in wet only precipitation were found by applying Mann-Kendall test. No trend was found for Na+, Mn, F- and for total wet deposition of potential acid. The decrease in deposition of acidifying substances is accompanied by simultaneous decrease of Ca 2+ and Mg2+ what can hinder the recovery from acidification. Cluster analysis has indicated the influence of the sea spray at this upcountry site and the common source of Pb, SO42-, Cd.