SPICEcore Advection
Abstract: 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 u...
Main Author: | |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
IEDA: US Antarctic Program Data Center
2020
|
Subjects: | |
Online Access: | http://get.iedadata.org/metadata/iso/601266 |
id |
dataone:http://get.iedadata.org/metadata/iso/601266 |
---|---|
record_format |
openpolar |
spelling |
dataone:http://get.iedadata.org/metadata/iso/601266 2024-06-03T18:46:23+00:00 SPICEcore Advection Fudge, T. J. 2020-03-25T00:00:00Z http://get.iedadata.org/metadata/iso/601266 unknown IEDA: US Antarctic Program Data Center Ice Core Data SPICECORE Cryosphere Antarctica South Pole US Antarctic Program Data Center (USAP-DC) Dataset 2020 dataone:urn:node:IEDA_USAP 2024-06-03T18:17:00Z Abstract: 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* Antarctic Antarctica ice core Ice Sheet South pole South pole IEDA: US Antarctic Program Data Center (via DataONE) Antarctic South Pole Titan ENVELOPE(-68.733,-68.733,-72.083,-72.083) |
institution |
Open Polar |
collection |
IEDA: US Antarctic Program Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:IEDA_USAP |
language |
unknown |
topic |
Ice Core Data SPICECORE Cryosphere Antarctica South Pole US Antarctic Program Data Center (USAP-DC) |
spellingShingle |
Ice Core Data SPICECORE Cryosphere Antarctica South Pole US Antarctic Program Data Center (USAP-DC) Fudge, T. J. SPICEcore Advection |
topic_facet |
Ice Core Data SPICECORE Cryosphere Antarctica South Pole US Antarctic Program Data Center (USAP-DC) |
description |
Abstract: 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 |
IEDA: US Antarctic Program Data Center |
publishDate |
2020 |
url |
http://get.iedadata.org/metadata/iso/601266 |
long_lat |
ENVELOPE(-68.733,-68.733,-72.083,-72.083) |
geographic |
Antarctic South Pole Titan |
geographic_facet |
Antarctic South Pole Titan |
genre |
Antarc* Antarctic Antarctica ice core Ice Sheet South pole South pole |
genre_facet |
Antarc* Antarctic Antarctica ice core Ice Sheet South pole South pole |
_version_ |
1800871166530813952 |