We contributed to develop this technique towards high precision and sufficient long-term stability. Presently we can analyse ca. We cooperate with that laboratory to extend the series from findings of subfossil pine in the river valleys of Danube and Rhine. Several floating series exist in the Boelling and Alleroed period. Their relation to postulated changes of ocean circulation in high latitudes of the North Atlantic is not yet understood.
Radiocarbon is the key isotope for dating of the deep waters in the world oceans.
Presently we focus on high latitude areas of the North Atlantic and the Arctic ocean to study deep water formation and water mass exchanges. In addition, the bomb-derived 14C uptake by the ocean serves to parameterize the penetration of anthropogenic CO2 releases into the ocean. We measure the 14C activity in two-weekly CO2 samples, obtained in a global network. Radiocarbon dating has acquired a central role in dating for prehistory. We cooperate with numerous archeological projects in Southern Germany, Italy, Greece and Turkey.