Our long-term observatories collect weather, soil and permafrost data at various measuring stations in Siberia (Lena river delta, Samoylov), Canada (Trail Valley Creek - TVC) and on Spitzbergen (Ny- Ålesund - Bayelva).
The TrendViewer shows the data series for the selected parameters at these locations and creates a regression line for the annual values to estimate a trend. Below that, the respective years are plotted in order to be able to identify any seasonal changes that may have occurred. In addition, some statistics and box plots are created. Several settings can be made in the left column. In addition to the selection of the station, dataset and measured variable, the observation period can be changed. It is also possible to select only certain months (e.g. summer would be 6–9, i.e. June to September). In some years there are larger measurement gaps. Therefore, by default, only years that have at least 80% of the data are used for the regression. This value can also be adjusted. For trend calculation, you can choose between mean value and annual sums (e.g. precipitation), as well as median, minimum and maximum value of the data series. The p-value indicates the significance of the slope (MannKendall test).