Fig. 6

Variability of relative humidity conditions at different measurement points and an official weather station. Scatterplot matrix of hourly relative humidity data measured in the litter (RHL), 50 cm height (RHa1 and 2), 2 m height inside (RHaIN) and outside (RHaOUT) the forest AW and of a nearby official weather station (RHDWD), from 25 October 2012 to 1 January 2015. The lower triangle illustrates scatterplots with LOWESS smoothed lines, the diagonal shows histograms and the upper triangle shows the root mean square error (standard deviation) between data from different measuring points. Relative humidity conditions measured at the official weather station were on average 24% RH lower (thus drier) than those measured in the litter layer