A general ocean circulation model is coupled with a 3D-thermodynamical ice-sheet/shelf model to
simulate the response of the Filchner–Ronne Ice Shelf (FRIS, Antarctica) and coastal parts of its catchment
basin to a postulated inflow of Warm Deep Water into the ice-shelf cavity on a 1000-yr timescale.
Prescribed ocean warming (based on climate projections) enters the ice-shelf cavity in the up to 1500 m
deep Filchner Trough and penetrates deep into the sub-ice cavity. Increasing basal melt rates induce
geometry changes of the cavity, which in turn have an impact on the ocean circulation and therefore
the modelled melt rates. Highest melt rates of about 20 m yr−1 follow the (up to 180 km) retreating
grounding line. Basal mass loss reaches about 250 km3 yr−1, doubling the present-day value. The most
vulnerable areas below the FRIS are the Bailey Ice Stream and the area between the Institute and
Moeller Ice Streams, where the increased melting accounts for about 80 km of the modelled grounding
line retreat on the backward sloping bedrock. The potential additional contribution to the eustatic sea
level rise due to the grounded-ice loss, simulated in an ensemble approach against a transient control
experiment, is about 0.05 mm yr−1 during the first 500 yr and about 0.17 mm yr−1 thereafter.
A general ocean circulation model is coupled with a 3D-thermodynamical ice-sheet/shelf model tosimulate the response of the Filchner–Ronne Ice Shelf (FRIS, Antarctica) and coastal parts of its catchmentbasin to a postulated inflow of Warm Deep Water into the ice-shelf cavity on a 1000-yr timescale.Prescribed ocean warming (based on climate projections) enters the ice-shelf cavity in the up to 1500 mdeep Filchner Trough and penetrates deep into the sub-ice cavity. Increasing basal melt rates inducegeometry changes of the cavity, which in turn have an impact on the ocean circulation and thereforethe modelled melt rates. Highest melt rates of about 20 m yr−1 follow the (up to 180 km) retreatinggrounding line. Basal mass loss reaches about 250 km3 yr−1, doubling the present-day value. The mostvulnerable areas below the FRIS are the Bailey Ice Stream and the area between the Institute andMoeller Ice Streams, where the increased melting accounts for about 80 km of the modelled groundingline retreat on the backward sloping bedrock. The potential additional contribution to the eustatic sealevel rise due to the grounded-ice loss, simulated in an ensemble approach against a transient controlexperiment, is about 0.05 mm yr−1 during the first 500 yr and about 0.17 mm yr−1 thereafter.
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