BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Bertie Miles (University of Durham) DTSTART:20210302T160000Z DTEND:20210302T170000Z DTSTAMP:20260423T035716Z UID:BASIDP/3 DESCRIPTION:Title: V ariable Antarctic ice flux linked to ocean forcing\, bed topography and ic e shelf extent\nby Bertie Miles (University of Durham) as part of BAS Ice Dynamics and Paleoclimate Seminars\n\n\nAbstract\nIt has been widely r eported that ice flux from the Antarctic Ice Sheet has increased over the preceding decades. The vast majority of these increases can be attributed to the ongoing destabilization of the Amundsen Sea sector in West Antarcti ca\, with a much more limited change in East Antarctica. However\, much le ss attention has been focussed on the temporal and spatial variations of i ce flux in Antarctica over the observational period.\n\nIn this study we c ombine existing velocity products (ITS_LIVE and MEaSUREs) to create 12 tim estamped velocity mosaics between 1999 and 2018 to investigate both overal l trends in ice flux and the temporal and spatial variability across our o bservational period. Overall we report a 41±11 Gt yr-1 increase in ice fl ux\, with a 45±8 Gt yr-1 increase West Antarctica and -4±7 Gt yr-1 decre ase in East Antarctica. However\, the rate of change has not been consiste nt through time and in the second half of our time series\, between 2009-2 010 and 2018 we report on a much more limited increase in net ice flux of the WAIS and EAIS (4±8 Gt yr-1). Despite the overall increase in ice flux in West Antarctica\, clear periods of deceleration are observed in most i ndividual glacier catchments. In East Antarctica\, despite overall consist ency\, 3-10% variations in ice flux are observed at several major outlet g laciers (e.g. Denman\, Totten\, Frost\, Cook\, Matusevitch\, Rennick). The se variations can be linked to regional oceanic variability which we estim ate by quantifying anomalies in the rate of ice shelf thickness change\, a long with highly localised differences in bed topography and ice shelf cal ving. In some cases\, this can result in neighbouring catchments simultane ously undergoing opposing trends.\n LOCATION:https://researchseminars.org/talk/BASIDP/3/ END:VEVENT END:VCALENDAR