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SUMMARY:Deep-reaching global ocean overturning circulation generated by su
 rface buoyancy forcing - Andreas Klocker\, University of Tasmania
DTSTART:20220706T140000Z
DTEND:20220706T150000Z
UID:TALK176324@talks.cam.ac.uk
CONTACT:Dr. Shenjie Zhou
DESCRIPTION:In contrast with the atmosphere\, which is heated from below b
 y solar radiation\, the ocean is heated and cooled at the surface. To driv
 e a large-scale overturning circulation in this context\, it is generally 
 assumed that either interior mixing by winds and tides\, or wind-driven pu
 mping is required\; in their absence\, the circulation is thought to colla
 pse to a shallow surface cell. We demonstrate\, using a primitive equation
  model with an idealized domain\, that surface temperature forcing alone c
 an drive an inter-hemisphere overturning provided that there is a channel 
 unblocked in the zonal direction\, such as in the Southern Ocean. With thi
 s geometry\, rotating horizontal convection\, in combination with asymmetr
 ic surface cooling between the north and south\, drives a deep-reaching tw
 o-cell overturning circulation. The resulting vertical stratification clos
 ely resembles that in the real ocean\, suggesting buoyancy forcing plays a
  much larger role in the climate system than usually assumed.
LOCATION:https://ukri.zoom.us/j/98472047905\;BAS seminar room 2
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