Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica
The geomorphic record indicates that alpine glaciers in the McMurdo Dry Valleys of southern Victoria Land, Antarctica, appear to advance during interglacial periods in response to ice-free conditions in the Ross Sea. Few records of these advances are preserved and/or subaerially exposed, complicatin...
Published in: | The Cryosphere |
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Copernicus Publications
2020
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00049958 2023-05-15T13:54:47+02:00 Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica Winsor, Kelsey Swanger, Kate M. Babcock, Esther Valletta, Rachel D. Dickson, James L. 2020-01 electronic https://doi.org/10.5194/tc-14-1-2020 https://noa.gwlb.de/receive/cop_mods_00049958 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049577/tc-14-1-2020.pdf https://tc.copernicus.org/articles/14/1/2020/tc-14-1-2020.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-14-1-2020 https://noa.gwlb.de/receive/cop_mods_00049958 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049577/tc-14-1-2020.pdf https://tc.copernicus.org/articles/14/1/2020/tc-14-1-2020.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2020 ftnonlinearchiv https://doi.org/10.5194/tc-14-1-2020 2022-02-08T22:37:05Z The geomorphic record indicates that alpine glaciers in the McMurdo Dry Valleys of southern Victoria Land, Antarctica, appear to advance during interglacial periods in response to ice-free conditions in the Ross Sea. Few records of these advances are preserved and/or subaerially exposed, complicating the interpretations of regional glacier response to climate changes. Here, we present geophysical and geochemical analyses of a rock glacier that originates from icefalls fed by alpine Doran Glacier in central Taylor Valley. The rock glacier exhibits a trend of increased weathering of granitic clasts via ventifaction and grussification down-flow. Meltwater ponds on the rock glacier exhibit variable salinity that ranges from freshwater to higher than seawater, with the highest salinity pond near the rock glacier toe. Ground-penetrating radar analyses reveal the feature to possess a primarily clean ice interior, with layers of englacial debris. Stable isotopic data from three ice cores support a glacial origin for the ice within the rock glacier. These data suggest that the current morphology of the rock glacier is the result of multiple events of increased ice contribution caused by advances of Doran Glacier, which is the main source of ice to the rock glacier. We therefore demonstrate the potential of ice-cored rock glaciers to record multiple advances and retreats of Dry Valley glaciers, permitting the interpretation of glacial responses to Pleistocene and Holocene climate change even where direct records are not present. Article in Journal/Newspaper Antarc* Antarctica McMurdo Dry Valleys Ross Sea The Cryosphere Victoria Land Niedersächsisches Online-Archiv NOA Ross Sea Victoria Land McMurdo Dry Valleys Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Doran Glacier ENVELOPE(162.667,162.667,-77.717,-77.717) The Cryosphere 14 1 1 16 |
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Open Polar |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Winsor, Kelsey Swanger, Kate M. Babcock, Esther Valletta, Rachel D. Dickson, James L. Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica |
topic_facet |
article Verlagsveröffentlichung |
description |
The geomorphic record indicates that alpine glaciers in the McMurdo Dry Valleys of southern Victoria Land, Antarctica, appear to advance during interglacial periods in response to ice-free conditions in the Ross Sea. Few records of these advances are preserved and/or subaerially exposed, complicating the interpretations of regional glacier response to climate changes. Here, we present geophysical and geochemical analyses of a rock glacier that originates from icefalls fed by alpine Doran Glacier in central Taylor Valley. The rock glacier exhibits a trend of increased weathering of granitic clasts via ventifaction and grussification down-flow. Meltwater ponds on the rock glacier exhibit variable salinity that ranges from freshwater to higher than seawater, with the highest salinity pond near the rock glacier toe. Ground-penetrating radar analyses reveal the feature to possess a primarily clean ice interior, with layers of englacial debris. Stable isotopic data from three ice cores support a glacial origin for the ice within the rock glacier. These data suggest that the current morphology of the rock glacier is the result of multiple events of increased ice contribution caused by advances of Doran Glacier, which is the main source of ice to the rock glacier. We therefore demonstrate the potential of ice-cored rock glaciers to record multiple advances and retreats of Dry Valley glaciers, permitting the interpretation of glacial responses to Pleistocene and Holocene climate change even where direct records are not present. |
format |
Article in Journal/Newspaper |
author |
Winsor, Kelsey Swanger, Kate M. Babcock, Esther Valletta, Rachel D. Dickson, James L. |
author_facet |
Winsor, Kelsey Swanger, Kate M. Babcock, Esther Valletta, Rachel D. Dickson, James L. |
author_sort |
Winsor, Kelsey |
title |
Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica |
title_short |
Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica |
title_full |
Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica |
title_fullStr |
Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica |
title_full_unstemmed |
Rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in Taylor Valley, Antarctica |
title_sort |
rock glacier characteristics serve as an indirect record of multiple alpine glacier advances in taylor valley, antarctica |
publisher |
Copernicus Publications |
publishDate |
2020 |
url |
https://doi.org/10.5194/tc-14-1-2020 https://noa.gwlb.de/receive/cop_mods_00049958 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049577/tc-14-1-2020.pdf https://tc.copernicus.org/articles/14/1/2020/tc-14-1-2020.pdf |
long_lat |
ENVELOPE(163.000,163.000,-77.617,-77.617) ENVELOPE(162.667,162.667,-77.717,-77.717) |
geographic |
Ross Sea Victoria Land McMurdo Dry Valleys Taylor Valley Doran Glacier |
geographic_facet |
Ross Sea Victoria Land McMurdo Dry Valleys Taylor Valley Doran Glacier |
genre |
Antarc* Antarctica McMurdo Dry Valleys Ross Sea The Cryosphere Victoria Land |
genre_facet |
Antarc* Antarctica McMurdo Dry Valleys Ross Sea The Cryosphere Victoria Land |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-14-1-2020 https://noa.gwlb.de/receive/cop_mods_00049958 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00049577/tc-14-1-2020.pdf https://tc.copernicus.org/articles/14/1/2020/tc-14-1-2020.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-14-1-2020 |
container_title |
The Cryosphere |
container_volume |
14 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
16 |
_version_ |
1766260890103971840 |