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CATEGORIES:British Antarctic Survey - Polar Oceans seminar se
 ries
SUMMARY:High-frequency fluctuations in Antarctic Bottom Wa
 ter transport driven by Southern Ocean winds - And
 rew Stewart\, University of California\, Los Angel
 es
DTSTART;TZID=Europe/London:20211103T153000
DTEND;TZID=Europe/London:20211103T163000
UID:TALK163018AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/163018
DESCRIPTION:Northward flow of Antarctic Bottom Water (AABW) ac
 ross the Southern Ocean comprises a key component 
 of the global overturning circulation. Yet AABW tr
 ansport remains poorly constrained by observations
  and state estimates\, and there is presently no m
 eans of directly monitoring any component of the S
 outhern Ocean overturning. However\, AABW flow is 
 dynamically linked to Southern Ocean surface circu
 lation via the zonal momentum balance\, offering p
 otential routes to indirect monitoring of the tran
 sport. Exploiting this dynamical link\, this study
  uses a dynamically self-consistent ocean state es
 timate (ECCOV4r4) to show that wind stress fluctua
 tions drive large AABW transport fluctuations on t
 ime scales shorter than ~2 years\, which comprise 
 almost all of the transport variance. This connect
 ion occurs due to differing time scales on which t
 opographic and interfacial form stresses respond t
 o wind variability\, likely associated with differ
 ences in barotropic vs. baroclinic Rossby wave pro
 pagation. These findings imply that AABW transport
  variability can largely be reconstructed from the
  surface wind stress alone.
LOCATION:British Antarctic Survey\, Zoom
CONTACT:Dr. Shenjie Zhou
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