C03

The linkage of surface and subsurface ecosystems is governed by the transport of the "total mobile inventory". Utilizing the unique infrastructure of comparative subsurface research at field sites with contrasting geology, project C03 aims to generalize our understanding of the total mobile inventory's role for the evolution of hydrogeoecological facies with focus on the aeration zone. This ambitious goal will be in reach by the synoptic analysis of long-term environmental time series that we gather from field observations and experiments targeted to uncover the key mechanisms and controls.