The map below provides trend information and summary statistics for a variety of parameters collated by the ICP Waters programme. The map displays water chemistry parameters measured in lakes across northeast America, Europe, and west Asia. Users can select the specific water chemistry parameter they wish to view. Pop-ups display annual boxplots of the raw data and provide information about the sampling stations. Mann-Kendall and Sen’s slope trend tests were implemented using the annual medians for datasets with at least 10 years of observations. Statistically significant (p<0.05) positive trends are shown in orange, and negative trends in green. Grey indicates either no trends or insufficient data (less than 10 years of observations).
Please note: trends may be based on different time periods and should not be considered directly comparable.