10Be and 14C in the Earth System

In a very short period of time, ¹⁰Be data have significantly improved our knowledge in various fields of Earth and planetary sciences. Examples are: (a) solar modulation of isotope production, revealed in ¹⁰Be ice-core profiles; (b) geomagnetic modulation of isotope production, revealed in ¹⁰Be ice-core (from the past 10 ka) and ocean-sediment profiles (geomagnetic reversals); (c) climatic effects reflected in ¹⁰Be profiles in loess and polar ice cores (¹⁰Be behaviour in atmosphere); (d) comparison of ¹⁰Be and ¹⁴C variations (tree rings) from carbon-cycle models and information on ocean circulation history from ¹⁴C measurements on benthic and planktonic Foraminifera in ocean sediments. An overview on work in collaboration with the Zurich AMS facility (with Professor W. Wolfli) is given.