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Englacial Architecture and Age‐Depth Constraints Across the West Antarctic Ice Sheet
Author(s) -
Ashmore David W.,
Bingham Robert G.,
Ross Neil,
Siegert Martin J.,
Jordan Tom A.,
Mair Douglas W. F.
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2019gl086663
Subject(s) - geology , ice stream , ice sheet , antarctic ice sheet , antarctic sea ice , ice divide , ice shelf , ice sheet model , fast ice , arctic ice pack , tributary , geomorphology , cryosphere , greenland ice sheet , ice core , sea ice , physical geography , paleontology , climatology , geography , cartography
The 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.