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SUMMARY:Ocean Warming and Accelerating Southern Ocean Zonal Flow - Jia-Rui
  Shi (Woods Hole Oceanographic Institute)
DTSTART:20230125T150000Z
DTEND:20230125T160000Z
UID:TALK194599@talks.cam.ac.uk
CONTACT:Dr Michael Haigh
DESCRIPTION: The Southern Ocean (>30°S) has taken up a large amount of an
 thropogenic heat north of the Subantarctic Front (SAF) of the Antarctic Ci
 rcumpolar Current (ACC). Poor sampling prior to the 1990s and decadal vari
 ability have heretofore masked the ocean’s dynamic response to this warm
 ing. Here we use the lengthening satellite altimetry and Argo float record
 s to show robust acceleration of zonally-averaged Southern Ocean zonal flo
 w at 48˚S-58˚S. This acceleration is reproduced in a hierarchy of climat
 e models\, including an ocean-eddy-resolving model. Anthropogenic ocean wa
 rming is the dominant driver\, as large (small) heat gain in the downwelli
 ng (upwelling) regime north (south) of the SAF causes zonal acceleration o
 n the northern flank of the ACC and adjacent subtropics due to increased b
 aroclinicity. In other words\, the increase of latitudinal density gradien
 t is causing the eastward flow to accelerate\, while the strengthened wind
  stress is of secondary importance. Moreover\, it is expected that the con
 tinued ocean warming could further accelerate Southern Ocean zonal flow in
  the future.
LOCATION:BAS Seminar Room 1
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