SPICEcore Advection
The South Pole Ice Core (SPICEcore), which spans the past 54,300 years, was drilled far from an ice divide such that ice recovered at depth originated upstream of the core site. If the climate is different upstream, the climate history recovered from the core will be a combination of the upstream co...
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U.S. Antarctic Program (USAP) Data Center
2020
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Online Access: | https://dx.doi.org/10.15784/601266 https://www.usap-dc.org/view/dataset/601266 |
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ftdatacite:10.15784/601266 2023-05-15T13:30:27+02:00 SPICEcore Advection Fudge, T. J. 2020 https://dx.doi.org/10.15784/601266 https://www.usap-dc.org/view/dataset/601266 en eng U.S. Antarctic Program (USAP) Data Center Creative Commons Attribution-NonCommercial-Share Alike 3.0 United States [CC BY-NC-SA 3.0] https://creativecommons.org/licenses/by-nc-sa/3.0/us CC-BY-NC-SA Ice Core Data SPICECORE Cryosphere Antarctica dataset Dataset 2020 ftdatacite https://doi.org/10.15784/601266 2021-11-05T12:55:41Z The South Pole Ice Core (SPICEcore), which spans the past 54,300 years, was drilled far from an ice divide such that ice recovered at depth originated upstream of the core site. If the climate is different upstream, the climate history recovered from the core will be a combination of the upstream conditions advected to the core site and temporal changes. Here, we evaluate the impact of ice advection on two fundamental records from SPICEcore: accumulation rate and water isotopes. We determined past locations of ice deposition based on GPS measurements of the modern velocity field spanning 100 km upstream, where ice of ~20 ka age would likely have originated. Beyond 100 km, there are no velocity measurements, but ice likely originates from Titan Dome, an additional 90 km distant. Shallow radar measurements extending 100 km upstream from the core site reveal large (~20%) variations in accumulation but no significant trend. Water isotope ratios, measured at 12.5 km intervals for the first 100 km of the flowline, show a decrease with elevation of -0.008‰ m-1 for δ18O. Advection adds approximately 1‰ for δ18O to the LGM-to-modern change. We also use an existing ensemble of continental ice-sheet model runs to assess the ice sheet elevation change through time. The magnitude of elevation change is likely small and the sign uncertain. Assuming a lapse rate of 10°C per km of elevation, the inference of LGM-to-modern temperature change is ~1.4°C smaller than if the flow from upstream is not considered. Dataset Antarc* Antarctica ice core Ice Sheet South pole South pole DataCite Metadata Store (German National Library of Science and Technology) South Pole Titan ENVELOPE(-68.733,-68.733,-72.083,-72.083) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Ice Core Data SPICECORE Cryosphere Antarctica |
spellingShingle |
Ice Core Data SPICECORE Cryosphere Antarctica Fudge, T. J. SPICEcore Advection |
topic_facet |
Ice Core Data SPICECORE Cryosphere Antarctica |
description |
The South Pole Ice Core (SPICEcore), which spans the past 54,300 years, was drilled far from an ice divide such that ice recovered at depth originated upstream of the core site. If the climate is different upstream, the climate history recovered from the core will be a combination of the upstream conditions advected to the core site and temporal changes. Here, we evaluate the impact of ice advection on two fundamental records from SPICEcore: accumulation rate and water isotopes. We determined past locations of ice deposition based on GPS measurements of the modern velocity field spanning 100 km upstream, where ice of ~20 ka age would likely have originated. Beyond 100 km, there are no velocity measurements, but ice likely originates from Titan Dome, an additional 90 km distant. Shallow radar measurements extending 100 km upstream from the core site reveal large (~20%) variations in accumulation but no significant trend. Water isotope ratios, measured at 12.5 km intervals for the first 100 km of the flowline, show a decrease with elevation of -0.008‰ m-1 for δ18O. Advection adds approximately 1‰ for δ18O to the LGM-to-modern change. We also use an existing ensemble of continental ice-sheet model runs to assess the ice sheet elevation change through time. The magnitude of elevation change is likely small and the sign uncertain. Assuming a lapse rate of 10°C per km of elevation, the inference of LGM-to-modern temperature change is ~1.4°C smaller than if the flow from upstream is not considered. |
format |
Dataset |
author |
Fudge, T. J. |
author_facet |
Fudge, T. J. |
author_sort |
Fudge, T. J. |
title |
SPICEcore Advection |
title_short |
SPICEcore Advection |
title_full |
SPICEcore Advection |
title_fullStr |
SPICEcore Advection |
title_full_unstemmed |
SPICEcore Advection |
title_sort |
spicecore advection |
publisher |
U.S. Antarctic Program (USAP) Data Center |
publishDate |
2020 |
url |
https://dx.doi.org/10.15784/601266 https://www.usap-dc.org/view/dataset/601266 |
long_lat |
ENVELOPE(-68.733,-68.733,-72.083,-72.083) |
geographic |
South Pole Titan |
geographic_facet |
South Pole Titan |
genre |
Antarc* Antarctica ice core Ice Sheet South pole South pole |
genre_facet |
Antarc* Antarctica ice core Ice Sheet South pole South pole |
op_rights |
Creative Commons Attribution-NonCommercial-Share Alike 3.0 United States [CC BY-NC-SA 3.0] https://creativecommons.org/licenses/by-nc-sa/3.0/us |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/10.15784/601266 |
_version_ |
1766008739605774336 |