1. Bristol Isotope Group, Department of Earth Sciences; University of Bristol; Bristol UK
2. BRIDGE, School of Geographical Sciences; University of Bristol; Bristol UK
3. Division of Geological and Planetary Sciences; California Institute of Technology; Pasadena USA
4. Department of Earth and Environmental Sciences; University of St Andrews; St Andrews UK
5. Institut für Geowissenschaften; University of Kiel; Kiel Germany
6. Ocean and Earth Science, National Oceanography Centre Southampton; University of Southampton; Southampton UK
7. Institute of Ecosystem Research; University of Kiel; Kiel Germany