Collaborative Research: Millennial-Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change
This award supports a project to add to the understanding of what drives glacial cycles. Most researchers agree that Milankovitch seasonal forcing paces the ice ages but how these insolation changes are leveraged into abrupt global climate change remains unknown. A current popular view is that the c...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:orsp_reports-1196 2023-05-15T13:50:15+02:00 Collaborative Research: Millennial-Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change Hall, Brenda Berger, Glenn 2006-09-14T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/orsp_reports/184 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1196&context=orsp_reports unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/orsp_reports/184 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1196&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 Glacial cycles Milankovitch seasonal forcing Ice ages Antarctica Southern Ocean Climate text 2006 ftmaineuniv 2023-03-12T19:15:56Z This award supports a project to add to the understanding of what drives glacial cycles. Most researchers agree that Milankovitch seasonal forcing paces the ice ages but how these insolation changes are leveraged into abrupt global climate change remains unknown. A current popular view is that the climate of Antarctica and the Southern Ocean leads that of the rest of the world by a couple thousand years at Termination I and by even greater margins during previous terminations. This project will integrate the geomorphological record of glacial history with a series of cores taken from the lake bottoms in the Dry Valleys of the McMurdo Sound region of Antarctica. Using a modified Livingstone corer, transects of long cores will be obtained from Lakes Fryxell, Bonney, Joyce, and Vanda. A multiparameter approach will be employed which is designed to extract the greatest possible amount of former water-level, glaciological, and paleoenvironmental data from Dry Valleys lakes. Estimates of hydrologic changes will come from different proxies, including grain size, stratigraphy, evaporite mineralogy, stable isotope and trace element chemistry, and diatom assemblage analysis. The chronology, necessary to integrate the cores with the geomorphological record, as well as for comparisons with Antarctic ice-core and glacial records, will come from Uranium-Thorium, Uranium-Helium, and Carbon-14 dating of carbonates, as well as luminescence sediment dating. Evaluation of the link between lake-level and climate will come from hydrological and energy-balance modelling. Combination of the more continuous lake-core sequences with the spatially extensive geomorphological record will result in an integrated Antarctic lake-level and paleoclimate dataset that extends back at least 30,000 years. This record will be compared to Dry Valleys glacier records and to the Antarctic ice cores to address questions of regional climate variability, and then to other Southern Hemisphere and Northern Hemisphere records to assess interhemispheric ... Text Antarc* Antarctic Antarctica ice core McMurdo Sound Southern Ocean The University of Maine: DigitalCommons@UMaine Antarctic Southern Ocean The Antarctic McMurdo Sound Vanda ENVELOPE(161.550,161.550,-77.533,-77.533) Livingstone ENVELOPE(-134.337,-134.337,61.333,61.333) Bonney ENVELOPE(162.417,162.417,-77.717,-77.717) Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) |
institution |
Open Polar |
collection |
The University of Maine: DigitalCommons@UMaine |
op_collection_id |
ftmaineuniv |
language |
unknown |
topic |
Glacial cycles Milankovitch seasonal forcing Ice ages Antarctica Southern Ocean Climate |
spellingShingle |
Glacial cycles Milankovitch seasonal forcing Ice ages Antarctica Southern Ocean Climate Hall, Brenda Berger, Glenn Collaborative Research: Millennial-Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change |
topic_facet |
Glacial cycles Milankovitch seasonal forcing Ice ages Antarctica Southern Ocean Climate |
description |
This award supports a project to add to the understanding of what drives glacial cycles. Most researchers agree that Milankovitch seasonal forcing paces the ice ages but how these insolation changes are leveraged into abrupt global climate change remains unknown. A current popular view is that the climate of Antarctica and the Southern Ocean leads that of the rest of the world by a couple thousand years at Termination I and by even greater margins during previous terminations. This project will integrate the geomorphological record of glacial history with a series of cores taken from the lake bottoms in the Dry Valleys of the McMurdo Sound region of Antarctica. Using a modified Livingstone corer, transects of long cores will be obtained from Lakes Fryxell, Bonney, Joyce, and Vanda. A multiparameter approach will be employed which is designed to extract the greatest possible amount of former water-level, glaciological, and paleoenvironmental data from Dry Valleys lakes. Estimates of hydrologic changes will come from different proxies, including grain size, stratigraphy, evaporite mineralogy, stable isotope and trace element chemistry, and diatom assemblage analysis. The chronology, necessary to integrate the cores with the geomorphological record, as well as for comparisons with Antarctic ice-core and glacial records, will come from Uranium-Thorium, Uranium-Helium, and Carbon-14 dating of carbonates, as well as luminescence sediment dating. Evaluation of the link between lake-level and climate will come from hydrological and energy-balance modelling. Combination of the more continuous lake-core sequences with the spatially extensive geomorphological record will result in an integrated Antarctic lake-level and paleoclimate dataset that extends back at least 30,000 years. This record will be compared to Dry Valleys glacier records and to the Antarctic ice cores to address questions of regional climate variability, and then to other Southern Hemisphere and Northern Hemisphere records to assess interhemispheric ... |
format |
Text |
author |
Hall, Brenda Berger, Glenn |
author_facet |
Hall, Brenda Berger, Glenn |
author_sort |
Hall, Brenda |
title |
Collaborative Research: Millennial-Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change |
title_short |
Collaborative Research: Millennial-Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change |
title_full |
Collaborative Research: Millennial-Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change |
title_fullStr |
Collaborative Research: Millennial-Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change |
title_full_unstemmed |
Collaborative Research: Millennial-Scale Fluctuations of Dry Valleys Lakes: Implications for Regional Climate Variability and the Interhemispheric (a)Synchrony of Climate Change |
title_sort |
collaborative research: millennial-scale fluctuations of dry valleys lakes: implications for regional climate variability and the interhemispheric (a)synchrony of climate change |
publisher |
DigitalCommons@UMaine |
publishDate |
2006 |
url |
https://digitalcommons.library.umaine.edu/orsp_reports/184 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1196&context=orsp_reports |
long_lat |
ENVELOPE(161.550,161.550,-77.533,-77.533) ENVELOPE(-134.337,-134.337,61.333,61.333) ENVELOPE(162.417,162.417,-77.717,-77.717) ENVELOPE(163.183,163.183,-77.617,-77.617) |
geographic |
Antarctic Southern Ocean The Antarctic McMurdo Sound Vanda Livingstone Bonney Fryxell |
geographic_facet |
Antarctic Southern Ocean The Antarctic McMurdo Sound Vanda Livingstone Bonney Fryxell |
genre |
Antarc* Antarctic Antarctica ice core McMurdo Sound Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica ice core McMurdo Sound Southern Ocean |
op_source |
University of Maine Office of Research Administration: Grant Reports |
op_relation |
https://digitalcommons.library.umaine.edu/orsp_reports/184 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1196&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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1766253291886346240 |