Persistent tracers of historic ice flow in glacial stratigraphy near Kamb Ice Stream, West Antarctica
Variations in properties controlling ice flow (e.g., topography, accumulation rate, basal friction) are recorded by structures in glacial stratigraphy. When anomalies that disturb the stratigraphy are fixed in space, the structures they produce advect away from the source and can be used to trace fl...
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ftcopernicus:oai:publications.copernicus.org:tc67428 2023-05-15T13:55:28+02:00 Persistent tracers of historic ice flow in glacial stratigraphy near Kamb Ice Stream, West Antarctica Holschuh, Nicholas Christianson, Knut Conway, Howard Jacobel, Robert W. Welch, Brian C. 2018-12-11 application/pdf https://doi.org/10.5194/tc-12-2821-2018 https://tc.copernicus.org/articles/12/2821/2018/ eng eng doi:10.5194/tc-12-2821-2018 https://tc.copernicus.org/articles/12/2821/2018/ eISSN: 1994-0424 Text 2018 ftcopernicus https://doi.org/10.5194/tc-12-2821-2018 2020-07-20T16:23:08Z Variations in properties controlling ice flow (e.g., topography, accumulation rate, basal friction) are recorded by structures in glacial stratigraphy. When anomalies that disturb the stratigraphy are fixed in space, the structures they produce advect away from the source and can be used to trace flow pathways and reconstruct ice-flow patterns of the past. Here we provide an example of one of these persistent tracers: a prominent unconformity in the glacial layering that originates at Mt. Resnik, part of a subglacial volcanic complex near Kamb Ice Stream in central West Antarctica. The unconformity records a change in the regional thinning behavior seemingly coincident <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>(</mo><mo>∼</mo><mn mathvariant="normal">3440</mn><mo>±</mo><mn mathvariant="normal">117</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="70pt" height="12pt" class="svg-formula" dspmath="mathimg" md5hash="7a26d849a17d2f66b2efc90d63966a56"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-12-2821-2018-ie00001.svg" width="70pt" height="12pt" src="tc-12-2821-2018-ie00001.png"/></svg:svg> a) with stabilization of grounding-line retreat in the Ross Sea Embayment. We argue that this feature records both the flow and thinning history far upstream of the Ross Sea grounding line, indicating a limited influence of observed ice-stream stagnation cycles on large-scale ice-sheet routing over the last ∼ 5700 years. Text Antarc* Antarctica Ice Sheet Kamb Ice Stream Ross Sea West Antarctica Copernicus Publications: E-Journals Kamb Ice Stream ENVELOPE(-145.000,-145.000,-82.250,-82.250) Ross Sea West Antarctica The Cryosphere 12 9 2821 2829 |
institution |
Open Polar |
collection |
Copernicus Publications: E-Journals |
op_collection_id |
ftcopernicus |
language |
English |
description |
Variations in properties controlling ice flow (e.g., topography, accumulation rate, basal friction) are recorded by structures in glacial stratigraphy. When anomalies that disturb the stratigraphy are fixed in space, the structures they produce advect away from the source and can be used to trace flow pathways and reconstruct ice-flow patterns of the past. Here we provide an example of one of these persistent tracers: a prominent unconformity in the glacial layering that originates at Mt. Resnik, part of a subglacial volcanic complex near Kamb Ice Stream in central West Antarctica. The unconformity records a change in the regional thinning behavior seemingly coincident <math xmlns="http://www.w3.org/1998/Math/MathML" id="M1" display="inline" overflow="scroll" dspmath="mathml"><mrow><mo>(</mo><mo>∼</mo><mn mathvariant="normal">3440</mn><mo>±</mo><mn mathvariant="normal">117</mn></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="70pt" height="12pt" class="svg-formula" dspmath="mathimg" md5hash="7a26d849a17d2f66b2efc90d63966a56"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="tc-12-2821-2018-ie00001.svg" width="70pt" height="12pt" src="tc-12-2821-2018-ie00001.png"/></svg:svg> a) with stabilization of grounding-line retreat in the Ross Sea Embayment. We argue that this feature records both the flow and thinning history far upstream of the Ross Sea grounding line, indicating a limited influence of observed ice-stream stagnation cycles on large-scale ice-sheet routing over the last ∼ 5700 years. |
format |
Text |
author |
Holschuh, Nicholas Christianson, Knut Conway, Howard Jacobel, Robert W. Welch, Brian C. |
spellingShingle |
Holschuh, Nicholas Christianson, Knut Conway, Howard Jacobel, Robert W. Welch, Brian C. Persistent tracers of historic ice flow in glacial stratigraphy near Kamb Ice Stream, West Antarctica |
author_facet |
Holschuh, Nicholas Christianson, Knut Conway, Howard Jacobel, Robert W. Welch, Brian C. |
author_sort |
Holschuh, Nicholas |
title |
Persistent tracers of historic ice flow in glacial stratigraphy near Kamb Ice Stream, West Antarctica |
title_short |
Persistent tracers of historic ice flow in glacial stratigraphy near Kamb Ice Stream, West Antarctica |
title_full |
Persistent tracers of historic ice flow in glacial stratigraphy near Kamb Ice Stream, West Antarctica |
title_fullStr |
Persistent tracers of historic ice flow in glacial stratigraphy near Kamb Ice Stream, West Antarctica |
title_full_unstemmed |
Persistent tracers of historic ice flow in glacial stratigraphy near Kamb Ice Stream, West Antarctica |
title_sort |
persistent tracers of historic ice flow in glacial stratigraphy near kamb ice stream, west antarctica |
publishDate |
2018 |
url |
https://doi.org/10.5194/tc-12-2821-2018 https://tc.copernicus.org/articles/12/2821/2018/ |
long_lat |
ENVELOPE(-145.000,-145.000,-82.250,-82.250) |
geographic |
Kamb Ice Stream Ross Sea West Antarctica |
geographic_facet |
Kamb Ice Stream Ross Sea West Antarctica |
genre |
Antarc* Antarctica Ice Sheet Kamb Ice Stream Ross Sea West Antarctica |
genre_facet |
Antarc* Antarctica Ice Sheet Kamb Ice Stream Ross Sea West Antarctica |
op_source |
eISSN: 1994-0424 |
op_relation |
doi:10.5194/tc-12-2821-2018 https://tc.copernicus.org/articles/12/2821/2018/ |
op_doi |
https://doi.org/10.5194/tc-12-2821-2018 |
container_title |
The Cryosphere |
container_volume |
12 |
container_issue |
9 |
container_start_page |
2821 |
op_container_end_page |
2829 |
_version_ |
1766262125830864896 |