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SUMMARY:Deep ocean steady-state transport and decadal variability inferred
  from 1980-2021 anthropogenic transient tracer observations - Laura Cimoli
  (University of Cambridge)
DTSTART:20230309T113000Z
DTEND:20230309T123000Z
UID:TALK197986@talks.cam.ac.uk
CONTACT:Catherine Pearson
DESCRIPTION:The penetration of chlorofluorocarbons (CFCs) and sulfur-hexaf
 luoride (SF6) into the oceans represents an opportunity to trace intermedi
 ate-to-abyssal water masses as they leave the surface mixed layer and esti
 mate the ventilation rate of the global ocean since 1940. Here\, we analyz
 e CFC and SF6 observations that have been taken over four decades\, permit
 ting the largest fraction of the global ocean to be analyzed using these t
 racers. An inverse method is developed to address the temporal sparsity of
  the observations and an eight-decade annually resolved picture of CFCs an
 d SF6 evolution is produced. By comparing the reconstructed\, steady-state
  concentrations with the available observations\, we infer ventilation rat
 e changes on decadal timescales.
LOCATION:Open Plan Area\, Institute for Energy and Environmental Flows\, M
 adingley Rise CB3 0EZ
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