Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum
This award supports a study of the timing of climate changes in the Southern Hemisphere with the goal of reconstructing former ice extent and fluctuations, as well as paleoclimate, along the key latitudinal transect from temperate Tierra del Fuego to the polar Antarctic Peninsula. Samples already in...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:orsp_reports-1178 2023-05-15T13:33:54+02:00 Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum Hall, Brenda L. 2007-05-29T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/orsp_reports/164 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1178&context=orsp_reports unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/orsp_reports/164 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1178&context=orsp_reports 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). University of Maine Office of Research Administration: Grant Reports Climate Change Climatology Climate Glaciology text 2007 ftmaineuniv 2023-03-12T19:15:49Z This award supports a study of the timing of climate changes in the Southern Hemisphere with the goal of reconstructing former ice extent and fluctuations, as well as paleoclimate, along the key latitudinal transect from temperate Tierra del Fuego to the polar Antarctic Peninsula. Samples already in hand will allow the dating of ice fluctuations in the South Shetland Islands (SSI), a critical location where that transect crosses the Antarctic Convergence. Surprisingly little concrete evidence exists concerning former ice extent in the island chain. The results of this study will answer a number of basic questions regarding ice extent and the timing of subsequent deglaciation in the Antarctic Peninsula. A cosmogenic exposure-age chronology will be produced from samples collected at carefully selected moraines on King George and Livingston Islands. A preliminary age of 18,000 years for a large granodiorite boulder from the outer moraine at Marian Cove suggests that the moraine may represent the Last Glacial Maximum (LGM) ice position. These data point to the potential for developing a ~20,000-yr record of ice fluctuations in the SSI, something that has not been achieved previously. Such data could be used not only to settle the long-standing debate over LGM ice extent in the SSI, but also would be valuable in assessing the global synchrony of large climate changes. Both a graduate and undergraduate student will be involved. This work builds on the recent success in dating glacial deposits in the Antarctic as young as 300 years using Beryllium-10 (10Be), as well as on an unexpected opportunity to map moraines and collect exposure-age samples in the SSI in 2002/2003. This research will produce a new understanding of the timing of ice fluctuations in the SSI, the extent and thickness of former ice cover, and may allow the development of a glacial chronology extending from the LGM to the late Holocene. This work will also provide a basis for inter-hemispheric comparisons of climate change and fits within the ... Text Antarc* Antarctic Antarctic Peninsula South Shetland Islands Tierra del Fuego The University of Maine: DigitalCommons@UMaine Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Marian ENVELOPE(-58.750,-58.750,-62.217,-62.217) Marian Cove ENVELOPE(-58.800,-58.800,-62.217,-62.217) |
institution |
Open Polar |
collection |
The University of Maine: DigitalCommons@UMaine |
op_collection_id |
ftmaineuniv |
language |
unknown |
topic |
Climate Change Climatology Climate Glaciology |
spellingShingle |
Climate Change Climatology Climate Glaciology Hall, Brenda L. Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum |
topic_facet |
Climate Change Climatology Climate Glaciology |
description |
This award supports a study of the timing of climate changes in the Southern Hemisphere with the goal of reconstructing former ice extent and fluctuations, as well as paleoclimate, along the key latitudinal transect from temperate Tierra del Fuego to the polar Antarctic Peninsula. Samples already in hand will allow the dating of ice fluctuations in the South Shetland Islands (SSI), a critical location where that transect crosses the Antarctic Convergence. Surprisingly little concrete evidence exists concerning former ice extent in the island chain. The results of this study will answer a number of basic questions regarding ice extent and the timing of subsequent deglaciation in the Antarctic Peninsula. A cosmogenic exposure-age chronology will be produced from samples collected at carefully selected moraines on King George and Livingston Islands. A preliminary age of 18,000 years for a large granodiorite boulder from the outer moraine at Marian Cove suggests that the moraine may represent the Last Glacial Maximum (LGM) ice position. These data point to the potential for developing a ~20,000-yr record of ice fluctuations in the SSI, something that has not been achieved previously. Such data could be used not only to settle the long-standing debate over LGM ice extent in the SSI, but also would be valuable in assessing the global synchrony of large climate changes. Both a graduate and undergraduate student will be involved. This work builds on the recent success in dating glacial deposits in the Antarctic as young as 300 years using Beryllium-10 (10Be), as well as on an unexpected opportunity to map moraines and collect exposure-age samples in the SSI in 2002/2003. This research will produce a new understanding of the timing of ice fluctuations in the SSI, the extent and thickness of former ice cover, and may allow the development of a glacial chronology extending from the LGM to the late Holocene. This work will also provide a basis for inter-hemispheric comparisons of climate change and fits within the ... |
format |
Text |
author |
Hall, Brenda L. |
author_facet |
Hall, Brenda L. |
author_sort |
Hall, Brenda L. |
title |
Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum |
title_short |
Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum |
title_full |
Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum |
title_fullStr |
Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum |
title_full_unstemmed |
Collaborative Research: Chronology of Ice Fluctuations in the South Shetland Islands Since the Last Glacial Maximum |
title_sort |
collaborative research: chronology of ice fluctuations in the south shetland islands since the last glacial maximum |
publisher |
DigitalCommons@UMaine |
publishDate |
2007 |
url |
https://digitalcommons.library.umaine.edu/orsp_reports/164 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1178&context=orsp_reports |
long_lat |
ENVELOPE(-58.750,-58.750,-62.217,-62.217) ENVELOPE(-58.800,-58.800,-62.217,-62.217) |
geographic |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Marian Marian Cove |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula South Shetland Islands Marian Marian Cove |
genre |
Antarc* Antarctic Antarctic Peninsula South Shetland Islands Tierra del Fuego |
genre_facet |
Antarc* Antarctic Antarctic Peninsula South Shetland Islands Tierra del Fuego |
op_source |
University of Maine Office of Research Administration: Grant Reports |
op_relation |
https://digitalcommons.library.umaine.edu/orsp_reports/164 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1178&context=orsp_reports |
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). |
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1766046808896700416 |