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SUMMARY:The role of surface forcing in driving pathways and time scales of
  ocean ventilation: a subpolar perspective - Alice Marzocchi\, George Nurs
 er\, Louis Clement\, Elaine McDonagh
DTSTART:20230921T100000Z
DTEND:20230921T110000Z
UID:TALK204880@talks.cam.ac.uk
CONTACT:Dr Michael Haigh
DESCRIPTION:Ocean ventilation and subduction are key processes regulating 
 the transport of \nwater from the mixed layer to the ocean's interior\, wh
 ich is isolated from the\natmosphere for a timescale set by the large-scal
 e circulation. Using numerical\nsimulations\, we assess where the ocean su
 bducts water and takes up properties\nfrom the atmosphere\, and how ocean 
 currents transport and redistribute these\nproperties. This is achieved by
  using passive tracers that are released annually\nfrom different ocean su
 rface “patches”\, representing water masses’ source\nregions. We sho
 w that interannual variability in subduction rates\, driven by\nchanges in
  surface forcing\, is key in setting the different sizes of the long-term\
 ninventory of the dyes. Both hemispheres exhibit a strong correlation betw
 een\nthe strength of ventilation in recently subducted waters and the long
 er-term dye\ninventory. Export and isolation of subducted waters is faster
  in the Northern\nthan Southern Hemisphere\, defining a stronger ventilati
 on “persistence”\,\nespecially at high latitudes (e.g. Labrador and Ir
 minger Sea). I will focus on\nboth the subpolar North Atlantic and Subanta
 rctic Mode Water source regions.\n
LOCATION:BAS Seminar Room 1\; https://ukri.zoom.us/j/91734606755
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