Englacial architecture and age‐depth constraints across the West Antarctic Ice Sheet
he englacial stratigraphic architecture of internal reﬂection horizons (IRHs) as imaged by ice‐penetrating radar (IPR) across ice sheets reﬂects the cumulative effects of surface mass balance, basal melt, and ice ﬂow. IRHs, considered isochrones, have typically been traced in interior, slow‐ﬂowing regions. Here, we identify three distinctive IRHs spanning the Institute and Möller catchments that cover 50% of West Antarctica's Weddell Sea Sector and are characterized by a complex system of ice stream tributaries. We place age constraints on IRHs through their intersections with previous geophysical surveys tied to Byrd Ice Core and by age‐depth modeling. We further show where the oldest ice likely exists within the region and that Holocene ice‐dynamic changes were limited to the catchment's lower reaches. The traced IRHs from this study have clear potential to nucleate a wider continental‐scale IRH database for validating ice sheet models.
Authors: Ashmore, David W., Bingham, Robert G., Ross, Neil, Siegert, Martin J., Jordan, Tom ORCID record for Tom Jordan, Mair, Douglas W.F.