BEGIN:VCALENDAR VERSION:2.0 PRODID:researchseminars.org CALSCALE:GREGORIAN X-WR-CALNAME:researchseminars.org BEGIN:VEVENT SUMMARY:Indrani Das (Lamont-Doherty Earth Observatory) DTSTART:20210216T160000Z DTEND:20210216T170000Z DTSTAMP:20260404T110826Z UID:BASIDP/1 DESCRIPTION:Title: Observations of the Grounding Line and Basal Conditions of Thwaites Glacier and Comparisons with Continental-scale Ice Sheet Model Inversions< /a>\nby Indrani Das (Lamont-Doherty Earth Observatory) as part of BAS Ice Dynamics and Paleoclimate Seminars\n\n\nAbstract\nThwaites Glacier is one of the fastest-moving and fastest-changing glaciers in West Antarctica. Th e grounding line of the Thwaites Glacier is retreating rapidly primarily d ue ocean-induced basal melt. Previous observations have also shown that th e basal conditions underneath Thwaites Glaciers can lead to rapid sliding. However\, the processes and conditions at the base of any glacier is very difficult to identify and model. The accuracy of our predictions of how a glacier might change is dependent on the ice sheet models identifying the primary drivers of change and incorporating the correct physical represen tation of the processes. As a part of the ITGC PROPHET\, I am working on i dentifying basal conditions underneath the Thwaites Glacier using Operatio n IceBridge ice-penetrating radar. The radar-interpreted basal conditions are then compared with inversions of basal friction coefficient and basal drag from three continental-scale ice sheet models ISSM\, Uá and STREAMIC E using similar boundary conditions and Weertman’s sliding law. In this talk\, I will present preliminary results of the radar and model compariso ns of basal conditions underneath the Thwaites Glacier and near its ground ing zone.\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/1/ END:VEVENT BEGIN:VEVENT SUMMARY:Stef Lhermitte (TU Delft) DTSTART:20210223T160000Z DTEND:20210223T170000Z DTSTAMP:20260404T110826Z UID:BASIDP/2 DESCRIPTION:Title: State and fate of Antarctica’s gatekeepers: ice shelf instability from a remote sensing and modelling perspective\nby Stef Lhermitte (TU Delft) as part of BAS Ice Dynamics and Paleoclimate Seminars\n\n\nAbstrac t\nMass loss from the Antarctic Ice Sheet is the largest uncertainty in cu rrent sea level rise projections and this uncertainty is largely related t o the response of ice shelves. Ice shelves are the gatekeepers of Antarcti ca as they\nbuttress the contribution of grounded ice to sea level rise. A lthough several processes have been identified that are key for future ice shelf instability and retreat\, assessing how much\, how fast ice shelf i nstability will contribute\nto future sea level rise remains a major uncer tainty as many of the processes (e.g. hydrofracturing\, basal melting\, da mage feedbacks) are not well understood or quantified. In this presentatio n\, Stef Lhermitte will discuss the role of satellite remote sensing and m odelling in assessing these processes by showing examples of Pine Island G lacier and Thwaites Glacier in the Amundsen Sea Embayment and other outlet glaciers in Antarctica with large consequences for global sea level.\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/2/ END:VEVENT BEGIN:VEVENT SUMMARY:Bertie Miles (University of Durham) DTSTART:20210302T160000Z DTEND:20210302T170000Z DTSTAMP:20260404T110826Z UID:BASIDP/3 DESCRIPTION:Title: Variable Antarctic ice flux linked to ocean forcing\, bed topography and ice shelf extent\nby Bertie Miles (University of Durham) as part of BAS Ice Dynamics and Paleoclimate Seminars\n\n\nAbstract\nIt has been w idely reported that ice flux from the Antarctic Ice Sheet has increased ov er the preceding decades. The vast majority of these increases can be attr ibuted to the ongoing destabilization of the Amundsen Sea sector in West A ntarctica\, with a much more limited change in East Antarctica. However\, much less attention has been focussed on the temporal and spatial variatio ns of ice flux in Antarctica over the observational period.\n\nIn this stu dy we combine existing velocity products (ITS_LIVE and MEaSUREs) to create 12 timestamped velocity mosaics between 1999 and 2018 to investigate both overall trends in ice flux and the temporal and spatial variability acros s our observational period. Overall we report a 41±11 Gt yr-1 increase in ice flux\, with a 45±8 Gt yr-1 increase West Antarctica and -4±7 Gt yr- 1 decrease in East Antarctica. However\, the rate of change has not been c onsistent through time and in the second half of our time series\, between 2009-2010 and 2018 we report on a much more limited increase in net ice f lux of the WAIS and EAIS (4±8 Gt yr-1). Despite the overall increase in i ce flux in West Antarctica\, clear periods of deceleration are observed in most individual glacier catchments. In East Antarctica\, despite overall consistency\, 3-10% variations in ice flux are observed at several major o utlet glaciers (e.g. Denman\, Totten\, Frost\, Cook\, Matusevitch\, Rennic k). These variations can be linked to regional oceanic variability which w e estimate by quantifying anomalies in the rate of ice shelf thickness cha nge\, along with highly localised differences in bed topography and ice sh elf calving. In some cases\, this can result in neighbouring catchments si multaneously undergoing opposing trends.\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/3/ END:VEVENT BEGIN:VEVENT SUMMARY:Lauren Simkins (University of Virginia) DTSTART:20210309T160000Z DTEND:20210309T170000Z DTSTAMP:20260404T110826Z UID:BASIDP/4 DESCRIPTION:Title: Geological insight into ice-ocean interactions in the grounding zone environment\nby Lauren Simkins (University of Virginia) as part of BA S Ice Dynamics and Paleoclimate Seminars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/4/ END:VEVENT BEGIN:VEVENT SUMMARY:Tina van de Flierdt (Imperial College London) DTSTART:20210316T160000Z DTEND:20210316T170000Z DTSTAMP:20260404T110826Z UID:BASIDP/5 DESCRIPTION:Title: Ice loss from Antarctica during late Pleistocene warm times\nby Tina van de Flierdt (Imperial College London) as part of BAS Ice Dynamics and Paleoclimate Seminars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/5/ END:VEVENT BEGIN:VEVENT SUMMARY:Sridhar Anandakrishnan (Penn State) DTSTART:20210413T130000Z DTEND:20210413T140000Z DTSTAMP:20260404T110826Z UID:BASIDP/6 DESCRIPTION:Title: Slip Slidin Away: Glaciers and Ice Sheets in a Warming Climate\n by Sridhar Anandakrishnan (Penn State) as part of BAS Ice Dynamics and Pal eoclimate Seminars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/6/ END:VEVENT BEGIN:VEVENT SUMMARY:Fiona Turner (King's College London) DTSTART:20210427T130000Z DTEND:20210427T140000Z DTSTAMP:20260404T110826Z UID:BASIDP/7 DESCRIPTION:Title: Using Bayesian techniques to reconstruct the Antarctic Ice Sheet at the Last Glacial Maximum\nby Fiona Turner (King's College London) as p art of BAS Ice Dynamics and Paleoclimate Seminars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/7/ END:VEVENT BEGIN:VEVENT SUMMARY:Jan de Rydt (Northumbria University) DTSTART:20210511T130000Z DTEND:20210511T140000Z DTSTAMP:20260404T110826Z UID:BASIDP/8 DESCRIPTION:Title: Drivers of Pine Island Glacier speed-up between 1996 and 2016\nb y Jan de Rydt (Northumbria University) as part of BAS Ice Dynamics and Pal eoclimate Seminars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/8/ END:VEVENT BEGIN:VEVENT SUMMARY:Diana Vladimirova (British Antarctic Survey) DTSTART:20210525T130000Z DTEND:20210525T140000Z DTSTAMP:20260404T110826Z UID:BASIDP/9 DESCRIPTION:Title: tbc\nby Diana Vladimirova (British Antarctic Survey) as part of BAS Ice Dynamics and Paleoclimate Seminars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/9/ END:VEVENT BEGIN:VEVENT SUMMARY:Brent Minchew (MIT) DTSTART:20210622T130000Z DTEND:20210622T140000Z DTSTAMP:20260404T110826Z UID:BASIDP/10 DESCRIPTION:Title: tbc\nby Brent Minchew (MIT) as part of BAS Ice Dynamics and Pal eoclimate Seminars\n\nAbstract: TBA\n LOCATION:https://stable.researchseminars.org/talk/BASIDP/10/ END:VEVENT END:VCALENDAR