Topographic Control of Regional Accumulation Rate Variability at South Pole and Implications for Ice-Core Interpretation
Snow-accumulation rates are known to be sensitive to local changes in ice-sheet surface slope because of the effect of katabatic winds. These topographic effects can be preserved in ice cores that are collected at non-ice-divide locations. The trajectory of an ice-core site at South Pole is reconstr...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:ers_facpub-1147 2024-09-15T18:11:54+00:00 Topographic Control of Regional Accumulation Rate Variability at South Pole and Implications for Ice-Core Interpretation Hamilton, Gordon S. 2004-01-01T08:00:00Z application/pdf https://digitalcommons.library.umaine.edu/ers_facpub/148 https://doi.org/10.3189/172756404781814050 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1147/viewcontent/hamilton_39_214_218.pdf unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/ers_facpub/148 doi:10.3189/172756404781814050 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1147/viewcontent/hamilton_39_214_218.pdf This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). Earth Science Faculty Scholarship Earth Sciences text 2004 ftmaineuniv https://doi.org/10.3189/172756404781814050 2024-07-24T05:38:40Z Snow-accumulation rates are known to be sensitive to local changes in ice-sheet surface slope because of the effect of katabatic winds. These topographic effects can be preserved in ice cores that are collected at non-ice-divide locations. The trajectory of an ice-core site at South Pole is reconstructed using measurements of ice-sheet motion to show that snow was probably deposited at places of different surface slope during the past 1000 years. Recent accumulation rates, derived from shallow firn cores, vary along this trajectory according to surface topography, so that on a relatively steep flank mean annual accumulation is similar to 18% smaller than on a nearby topographic depression. These modern accumulation rates are used to reinterpret the cause of accumulation rate variability with time in the long ice-core record as an ice-dynamics effect and not a climate-change signal. The results highlight the importance of conducting ancillary ice-dynamics measurements as part of ice-coring programs so that topographic effects can be deconvolved from potential climate signals. Text ice core Ice Sheet South pole The University of Maine: DigitalCommons@UMaine Annals of Glaciology 39 214 218 |
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Open Polar |
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The University of Maine: DigitalCommons@UMaine |
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ftmaineuniv |
language |
unknown |
topic |
Earth Sciences |
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Earth Sciences Hamilton, Gordon S. Topographic Control of Regional Accumulation Rate Variability at South Pole and Implications for Ice-Core Interpretation |
topic_facet |
Earth Sciences |
description |
Snow-accumulation rates are known to be sensitive to local changes in ice-sheet surface slope because of the effect of katabatic winds. These topographic effects can be preserved in ice cores that are collected at non-ice-divide locations. The trajectory of an ice-core site at South Pole is reconstructed using measurements of ice-sheet motion to show that snow was probably deposited at places of different surface slope during the past 1000 years. Recent accumulation rates, derived from shallow firn cores, vary along this trajectory according to surface topography, so that on a relatively steep flank mean annual accumulation is similar to 18% smaller than on a nearby topographic depression. These modern accumulation rates are used to reinterpret the cause of accumulation rate variability with time in the long ice-core record as an ice-dynamics effect and not a climate-change signal. The results highlight the importance of conducting ancillary ice-dynamics measurements as part of ice-coring programs so that topographic effects can be deconvolved from potential climate signals. |
format |
Text |
author |
Hamilton, Gordon S. |
author_facet |
Hamilton, Gordon S. |
author_sort |
Hamilton, Gordon S. |
title |
Topographic Control of Regional Accumulation Rate Variability at South Pole and Implications for Ice-Core Interpretation |
title_short |
Topographic Control of Regional Accumulation Rate Variability at South Pole and Implications for Ice-Core Interpretation |
title_full |
Topographic Control of Regional Accumulation Rate Variability at South Pole and Implications for Ice-Core Interpretation |
title_fullStr |
Topographic Control of Regional Accumulation Rate Variability at South Pole and Implications for Ice-Core Interpretation |
title_full_unstemmed |
Topographic Control of Regional Accumulation Rate Variability at South Pole and Implications for Ice-Core Interpretation |
title_sort |
topographic control of regional accumulation rate variability at south pole and implications for ice-core interpretation |
publisher |
DigitalCommons@UMaine |
publishDate |
2004 |
url |
https://digitalcommons.library.umaine.edu/ers_facpub/148 https://doi.org/10.3189/172756404781814050 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1147/viewcontent/hamilton_39_214_218.pdf |
genre |
ice core Ice Sheet South pole |
genre_facet |
ice core Ice Sheet South pole |
op_source |
Earth Science Faculty Scholarship |
op_relation |
https://digitalcommons.library.umaine.edu/ers_facpub/148 doi:10.3189/172756404781814050 https://digitalcommons.library.umaine.edu/context/ers_facpub/article/1147/viewcontent/hamilton_39_214_218.pdf |
op_rights |
This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. In addition, no permission is required from the rights-holder(s) for educational uses. For other uses, you need to obtain permission from the rights-holder(s). |
op_doi |
https://doi.org/10.3189/172756404781814050 |
container_title |
Annals of Glaciology |
container_volume |
39 |
container_start_page |
214 |
op_container_end_page |
218 |
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1810449482698981376 |