Published online by Cambridge University Press: 13 July 2009
In the Hohenheim tree-ring laboratory, two long tree-ring chronologies have been built, spanning the past 11 600 years. This is the world's longest continuous tree-ring calendar. It has become the backbone of the calibration of the radiocarbon time scale, offering absolute and accurate dates for archaeology, vegetation history and paleoclimate studies. 14C analyses of the tree-ring chronologies provide insight into the process controlling the production of cosmogenic nuclides, i.e. mainly the geomagnetic dipole moment and solar variability. They also set geochemical constraints to variations in the carbon cycle during a major climatic excursion.