Bomb fall-out ~(236)U as a global oceanic tracer using an annually resolved coral core

摘要

Anthropogenic ~(236)U (t_(1/2)=23.4My) is an emerging isotopic ocean tracer with interesting oceanographic properties, but only with recent advances in accelerator mass spectrometry techniques is it now possible to detect the levels from global fall-out of nuclear weapons testing across the water column. To make full use of this tracer, an assessment of its input into the ocean over the past decades is required. We captured the bomb-pulse of ~(236)U in an annually resolved coral core record from the Caribbean Sea. We thereby establish a concept which gives ~(236)U great advantage - the presence of reliable, well-resolved chronological archives. This allows studies of not only the present distribution pattern, but gives access to the temporal evolution of ~(236)U in ocean waters over the past decades.