³⁹Ar dating with small samples provides new key constraints on ocean ventilation.

ABSTRACT: Ocean ventilation is the integrated effect of various processes that exchange surface properties with the ocean interior and is essential for oxygen supply, storage of anthropogenic carbon and the heat budget of the ocean, for instance. Current observational methods utilise transient tracers, e.g. tritium, SF_6, CFCs and ¹⁴C. However, their dating ranges are not ideal to resolve the centennial-dynamics of the deep ocean, a gap filled by the noble gas isotope ³⁹Ar with a half-life of 269 years. Its broad application has been hindered by its very low abundance, requiring 1000 L of water for dating. Here we show successful ³⁹Ar dating with 5 L of water based on the atom-optical technique Atom Trap Trace Analysis. Our data reveal previously not quanti

SUBMITTER: Ebser S 

PROVIDER: S-EPMC6261945 | biostudies-literature | 2018 Nov

REPOSITORIES: biostudies-literature