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SUMMARY:An idealized Weddell Gyre and its extreme sensitivity to resolutio
 n - Andrew Styles (University of Oxford)
DTSTART:20230531T140000Z
DTEND:20230531T150000Z
UID:TALK201595@talks.cam.ac.uk
CONTACT:Dr Michael Haigh
DESCRIPTION:How do mesoscale eddies affect the Weddell Gyre strength? We i
 nvestigate this by running an idealized model of the Weddell Gyre at eddy-
 parametrized\, eddy-permitting\, and eddy-rich resolutions and find that t
 he gyre is strongly sensitive to horizontal resolution. The gyre transport
  is largest at eddy-permitting resolutions and smallest at eddy-parametriz
 ed resolutions. The eddy-permitting simulations have the largest horizonta
 l density gradients and the weakest stratification over the gyre basin. Th
 e large horizontal density gradients induce a significant thermal wind tra
 nsport and increase the mean available potential energy for mesoscale eddi
 es. The distribution of eddy kinetic energy indicates that explicit eddies
  in simulations intensify the bottom circulation of the gyre via non-linea
 r dynamics. We also find that the gyre transport is insensitive to large v
 ariations in the ACC strength. Estimates of the Weddell Gyre transport alr
 eady vary widely between climate simulations. If climate models adopt hori
 zontal resolutions that the Weddell Gyre is most sensitive to\, then simul
 ations of the Weddell Gyre could become more disparate.
LOCATION:BAS Seminar Room 2\; https://ukri.zoom.us/j/93688883186
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