Age field and particle trajectories using a 2.5D inverse model along a flowline from DF to EDML, Antarctica

We present a 2.5D pseudo-steady state inverse model applied to the flow line from Dome Fuji (DF) to the EPICA Dronning Maud Land (EDML) ice core drill site. The model is constrained by radar horizons dated from 4-132 ka using the DF ice core chronology. We interpolate and extrapolate the age field using these horizons. The simplicity of our 2.5D numerical integration scheme results in an efficient computation time allowing us to use inverse methods to determine poorly known parameters such as surface accumulation rate, velocity profile and basal conditions.

We find that the amount of basal melting along the DF-EDML flowline generally correlates with higher ice thickness. We also look at the spatial origin of particles now at the EDML drill site, as this is an important consideration for corrections in measurements of the ice core itself. We compare to a Huybrechts et al. 2007 who used a more complex model on the same area. Finally, we look at areas along the flowline where ice >1Ma could potentially be found.