BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Andrew Stewart (UCLA) DTSTART:20211103T153000Z DTEND:20211103T163000Z DTSTAMP:20260423T021350Z UID:BAS-PO/24 DESCRIPTION:Title: High-frequency fluctuations in Antarctic Bottom Water transport driven by Southern Ocean winds\nby Andrew Stewart (UCLA) as part of BAS Polar Oc eans Seminar\n\n\nAbstract\nNorthward flow of Antarctic Bottom Water (AABW ) across the Southern Ocean comprises a key component of the global overtu rning circulation. Yet AABW transport remains poorly constrained by observ ations and state estimates\, and there is presently no means of directly m onitoring any component of the Southern Ocean overturning. However\, AABW flow is dynamically linked to Southern Ocean surface circulation via the z onal momentum balance\, offering potential routes to indirect monitoring o f the transport. Exploiting this dynamical link\, this study uses a dynami cally self-consistent ocean state estimate (ECCOV4r4) to show that wind st ress fluctuations drive large AABW transport fluctuations on time scales s horter than ~2 years\, which comprise almost all of the transport variance . This connection occurs due to differing time scales on which topographic and interfacial form stresses respond to wind variability\, likely associ ated with differences in barotropic vs. baroclinic Rossby wave propagation . These findings imply that AABW transport variability can largely be reco nstructed from the surface wind stress alone.\n LOCATION:https://researchseminars.org/talk/BAS-PO/24/ END:VEVENT END:VCALENDAR