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SUMMARY:Indrani Das (Lamont-Doherty Earth Observatory)
DTSTART;VALUE=DATE-TIME:20210216T160000Z
DTEND;VALUE=DATE-TIME:20210216T170000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/1
DESCRIPTION:Title: O
bservations of the Grounding Line and Basal Conditions of Thwaites Glacier
and Comparisons with Continental-scale Ice Sheet Model Inversions\nby
Indrani Das (Lamont-Doherty Earth Observatory) as part of BAS Ice Dynamic
s and Paleoclimate Seminars\n\n\nAbstract\nThwaites Glacier is one of the
fastest-moving and fastest-changing glaciers in West Antarctica. The groun
ding line of the Thwaites Glacier is retreating rapidly primarily due ocea
n-induced basal melt. Previous observations have also shown that the basal
conditions underneath Thwaites Glaciers can lead to rapid sliding. Howeve
r\, the processes and conditions at the base of any glacier is very diffic
ult to identify and model. The accuracy of our predictions of how a glacie
r might change is dependent on the ice sheet models identifying the primar
y drivers of change and incorporating the correct physical representation
of the processes. As a part of the ITGC PROPHET\, I am working on identify
ing basal conditions underneath the Thwaites Glacier using Operation IceBr
idge ice-penetrating radar. The radar-interpreted basal conditions are the
n compared with inversions of basal friction coefficient and basal drag fr
om three continental-scale ice sheet models ISSM\, Uá and STREAMICE using
similar boundary conditions and Weertman’s sliding law. In this talk\,
I will present preliminary results of the radar and model comparisons of b
asal conditions underneath the Thwaites Glacier and near its grounding zon
e.\n
LOCATION:https://researchseminars.org/talk/BASIDP/1/
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SUMMARY:Stef Lhermitte (TU Delft)
DTSTART;VALUE=DATE-TIME:20210223T160000Z
DTEND;VALUE=DATE-TIME:20210223T170000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/2
DESCRIPTION:Title: S
tate 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\nAbstract\nMass
loss from the Antarctic Ice Sheet is the largest uncertainty in current s
ea level rise projections and this uncertainty is largely related to the r
esponse of ice shelves. Ice shelves are the gatekeepers of Antarctica as t
hey\nbuttress the contribution of grounded ice to sea level rise. Although
several processes have been identified that are key for future ice shelf
instability and retreat\, assessing how much\, how fast ice shelf instabil
ity will contribute\nto future sea level rise remains a major uncertainty
as many of the processes (e.g. hydrofracturing\, basal melting\, damage fe
edbacks) are not well understood or quantified. In this presentation\, Ste
f Lhermitte will discuss the role of satellite remote sensing and modellin
g in assessing these processes by showing examples of Pine Island Glacier
and Thwaites Glacier in the Amundsen Sea Embayment and other outlet glacie
rs in Antarctica with large consequences for global sea level.\n
LOCATION:https://researchseminars.org/talk/BASIDP/2/
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SUMMARY:Bertie Miles (University of Durham)
DTSTART;VALUE=DATE-TIME:20210302T160000Z
DTEND;VALUE=DATE-TIME:20210302T170000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
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/
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SUMMARY:Lauren Simkins (University of Virginia)
DTSTART;VALUE=DATE-TIME:20210309T160000Z
DTEND;VALUE=DATE-TIME:20210309T170000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/4
DESCRIPTION:Title: G
eological insight into ice-ocean interactions in the grounding zone enviro
nment\nby Lauren Simkins (University of Virginia) as part of BAS Ice D
ynamics and Paleoclimate Seminars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/BASIDP/4/
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SUMMARY:Tina van de Flierdt (Imperial College London)
DTSTART;VALUE=DATE-TIME:20210316T160000Z
DTEND;VALUE=DATE-TIME:20210316T170000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/5
DESCRIPTION:Title: I
ce loss from Antarctica during late Pleistocene warm times\nby Tina va
n de Flierdt (Imperial College London) as part of BAS Ice Dynamics and Pal
eoclimate Seminars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/BASIDP/5/
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SUMMARY:Sridhar Anandakrishnan (Penn State)
DTSTART;VALUE=DATE-TIME:20210413T130000Z
DTEND;VALUE=DATE-TIME:20210413T140000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/6
DESCRIPTION:Title: S
lip Slidin Away: Glaciers and Ice Sheets in a Warming Climate\nby Srid
har Anandakrishnan (Penn State) as part of BAS Ice Dynamics and Paleoclima
te Seminars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/BASIDP/6/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fiona Turner (King's College London)
DTSTART;VALUE=DATE-TIME:20210427T130000Z
DTEND;VALUE=DATE-TIME:20210427T140000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/7
DESCRIPTION:Title: U
sing Bayesian techniques to reconstruct the Antarctic Ice Sheet at the Las
t Glacial Maximum\nby Fiona Turner (King's College London) as part of
BAS Ice Dynamics and Paleoclimate Seminars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/BASIDP/7/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Jan de Rydt (Northumbria University)
DTSTART;VALUE=DATE-TIME:20210511T130000Z
DTEND;VALUE=DATE-TIME:20210511T140000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/8
DESCRIPTION:Title: D
rivers of Pine Island Glacier speed-up between 1996 and 2016\nby Jan d
e Rydt (Northumbria University) as part of BAS Ice Dynamics and Paleoclima
te Seminars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/BASIDP/8/
END:VEVENT
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SUMMARY:Diana Vladimirova (British Antarctic Survey)
DTSTART;VALUE=DATE-TIME:20210525T130000Z
DTEND;VALUE=DATE-TIME:20210525T140000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/9
DESCRIPTION:Title: t
bc\nby Diana Vladimirova (British Antarctic Survey) as part of BAS Ice
Dynamics and Paleoclimate Seminars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/BASIDP/9/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Brent Minchew (MIT)
DTSTART;VALUE=DATE-TIME:20210622T130000Z
DTEND;VALUE=DATE-TIME:20210622T140000Z
DTSTAMP;VALUE=DATE-TIME:20240329T140526Z
UID:BASIDP/10
DESCRIPTION:Title:
tbc\nby Brent Minchew (MIT) as part of BAS Ice Dynamics and Paleoclima
te Seminars\n\nAbstract: TBA\n
LOCATION:https://researchseminars.org/talk/BASIDP/10/
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