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SUMMARY:Climate variability and change in the subpolar Southern Ocean (and
  its impact on biogeochemistry and marine ecosystems) - Graeme MacGilchris
 t\, Princeton University &amp\; NOAA-GFDL
DTSTART:20221017T100000Z
DTEND:20221017T110000Z
UID:TALK184085@talks.cam.ac.uk
CONTACT:Dr. Shenjie Zhou
DESCRIPTION:The ocean around Antarctica\, south of the polar front\, has b
 oth local importance (as a haven for unique and diverse ecosystems) and gl
 obal climatic significance (as a region of anthropogenic heat and carbon u
 ptake and glacial melt). The climate of the region is characterized by sub
 stantial interannual-to-decadal variability on top of the forced climate c
 hange signal\, both of which imprint themselves on the region’s local an
 d global impact. In this talk\, I will present research from two studies: 
 one considering the region’s interannual variability and another its for
 ced change.\n\nInterannual variability of primary production in the sea-ic
 e zone Using perfect model experiments in an Earth System Model\, we show 
 that primary production in the sea-ice zone is predictable up to several y
 ears in advance\, with regional differences in the predictability time hor
 izon. We describe a causal mechanism that links the predictability of prim
 ary production to that of sea-ice extent\, itself arising from sea-ice per
 sistence and memory of upper ocean heat content.\n\nForced change in respo
 nse to Antarctic Ice Sheet melt Perturbation experiments were used to inve
 stigate the impact of Antarctic Ice Sheet melt in two climate models diffe
 ring primarily in their horizontal ocean grid resolution. A watermass tran
 sformation framework reveals a distinct response of the abyssal waters in 
 the two models. The abyssal water volume declines 4 times faster in the hi
 gher resolution model\, owing to an interplay between dense shelf water fo
 rmation and interior ocean mixing\, with implications for the oceanic upta
 ke of heat and carbon in a changing climate.
LOCATION:https://ukri.zoom.us/j/99601243156\; BAS Seminar Room 330b
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