Assessing the continuity of the blue ice climate record at Patriot Hills, Horseshoe Valley, West Antarctica
- AMER GEOPHYSICAL UNION
- Publication Type:
- Journal Article
- Geophysical Research Letters, 2016, 43, (5), pp. 2019-2026
- Issue Date:
|Geophysical Research Letters - 2016 - Winter - Assessing the continuity of the blue ice climate record at Patriot Hills .pdf||Published version||1.77 MB|
Copyright Clearance Process
- Recently Added
- In Progress
- Closed Access
This item is closed access and not available.
We use high-resolution ground-penetrating radar (GPR) to assess the continuity of the Blue Ice Area (BIA) horizontal climate record at Patriot Hills, Horseshoe Valley, West Antarctica. The sequence contains three pronounced changes in deuterium isotopic values at ~18 cal ka, ~12 cal ka, and ~8 cal ka. GPR surveys along the climate sequence reveal continuous, conformable dipping isochrones, separated by two unconformities in the isochrone layers, which correlate with the two older deuterium shifts. We interpret these unconformities as discontinuities in the sequence, rather than direct measures of climate change. Ice sheet models and Internal Layer Continuity Index plots suggest that the unconformities represent periods of erosion occurring, as the former ice surface was scoured by katabatic winds in front of mountains at the head of Horseshoe Valley. This study demonstrates the importance of high-resolution GPR surveys for investigating both paleoflow dynamics and interpreting BIA climate records.
Please use this identifier to cite or link to this item: