What determines the ice shelf shape?

Ice shelf melt rates near grounding lines are a few orders of magnitude higher than other locations. This intense melting close to
the grounding zone is crucial as it induces ice shelf thinning, further acceleration of ice flow, and grounded ice loss. However,
little is revealed about ice and ocean processes determining peak ice shelf melt rates close to the grounding line because (1) ocean
modelers apply a constant cavity geometry, (2) ice modelers typically assume some parameterizations for determining ice shelf melt rates,
and (3) ice-ocean coupled simulations typically require long model integration, necessitating coarse resolution, and they are not able to
resolve small-scale processes near grounding zones. Here, we develop an idealized high-resolution Pine-Island-like model configuration (250
m, 500m, and 1km horizontal and 10 m vertical grid spacings) and conduct ice-ocean coupled simulation for 20 years after 60 years of
initialization. We show that ice slope and ice shelf melt rate close to the grounding zone increases with higher grid resolution but ice
shelf geometry converges towards the highest resolution solution. We are also able to simulate the formation of sub-ice shelf channels by
applying seasonally varying oceanic conditions. We also present our preliminary results of ice-ocean coupled realistic Pine Island
simulation using unprecedentedly high horizontal and vertical resolution  (200m horizontal and 10 m vertical grid spacings). This is
a step towards understanding the ice-ocean interacting mechanisms determining ice shelf shape and melt rate, which is crucial for
improved projections of future Antarctic ice loss.