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SUMMARY:Abyssal ocean overturning slowdown and warming driven by Antarctic
  meltwater - Prof Matt England (UNSW)
DTSTART:20230419T100000Z
DTEND:20230419T110000Z
UID:TALK196852@talks.cam.ac.uk
CONTACT:Dr Michael Haigh
DESCRIPTION:The abyssal ocean circulation is a key component of the global
  meridional overturning circulation\, cycling heat\, carbon\, oxygen and n
 utrients throughout the world ocean. The strongest historical trend observ
 ed in the abyssal ocean is warming at high southern latitudes\, yet it is 
 unclear what processes have driven this warming\, and whether it is linked
  to a slowdown in the ocean's overturning circulation. Furthermore\, futur
 e change in the abyssal overturning remains uncertain\, with the latest CM
 IP6 projections not accounting for dynamic ice-sheet melt. In this talk I 
 will present new transient forced high-resolution coupled ocean – sea-ic
 e model simulations to show that under a high emissions scenario\, abyssal
  warming is set to accelerate over the next 30 years. We find that meltwat
 er input around Antarctica drives a contraction of Antarctic Bottom Water 
 (AABW)\, opening a pathway that allows warm Circumpolar Deep Water greater
  access to the continental shelf. The reduction in AABW formation results 
 in warming and aging of the abyssal ocean\, consistent with recent measure
 ments. In contrast\, projected wind and thermal forcing has little impact 
 on the properties\, age\, and volume of AABW. These results highlight the 
 critical importance of Antarctic meltwater in setting the abyssal ocean ov
 erturning\, with implications for global ocean biogeochemistry and climate
  that could last for centuries.
LOCATION:BAS Conference Theatre\; https://ukri.zoom.us/j/94167200755
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