Radiocarbon analysis of dissolved organic carbon from ice cores
This thesis provided the first comprehensive evaluation of the great potential of applying
radiocarbon analysis of the dissolved organic carbon (DOC) fraction in ice cores at different
time scale. Before large-scale human activities (biomass burning, fossil fuel burning, land use
etc.), DO14C analysis was used to determine the age of the ice. After the industrialization,
radiocarbon analysis can be used for investigating the anthropogenic perturbation to
carbonaceous aerosols. Aerosols have very different regional scale distribution due to their
short atmospheric lifetime and the uneven distribution of emissions sources. In this thesis, the
first complete high-resolution carbonaceous aerosol record with the corresponding fossil and
non-fossil contributions was reconstructed from the Fiescherhorn glacier ice core (3900 m asl.,
Swiss Alps). The total carbonaceous aerosol increased by a factor of three at the end of the
20th century compared to the pre-industrial background. Fossil fuel combustion contributed up
to ~32% of the increase. Element carbon (EC) had highest values in the first half of the 20th
century, to a large extend caused by fossil fuel emissions. In contrast, Organic carbon (OC)
showed a strong increasing trend since 1940s, mostly of non-fossil origin, due to the
enhancement of SOA formation.