Examination of the 500,000-Year Climate Record in Ice at Mt. Moulton, West Antarctica
This project was a pilot project to determine if the ice on Mt. Moulton provides a reliable record of past climatic conditions. The area of study is a several hundred-meter section of blue ice (Trench A) that spans the time period from approximately the early Holocene to over 492k years ago. Dating...
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ftmaineuniv:oai:digitalcommons.library.umaine.edu:orsp_reports-1130 2023-05-15T13:57:18+02:00 Examination of the 500,000-Year Climate Record in Ice at Mt. Moulton, West Antarctica Zielinski, Gregory A. Mayewski, Paul Andrew 2002-09-09T07:00:00Z application/pdf https://digitalcommons.library.umaine.edu/orsp_reports/126 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1130&context=orsp_reports unknown DigitalCommons@UMaine https://digitalcommons.library.umaine.edu/orsp_reports/126 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1130&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 Antarctic Glaciology Climate Environmental Sciences Glaciology text 2002 ftmaineuniv 2023-03-12T19:15:26Z This project was a pilot project to determine if the ice on Mt. Moulton provides a reliable record of past climatic conditions. The area of study is a several hundred-meter section of blue ice (Trench A) that spans the time period from approximately the early Holocene to over 492k years ago. Dating control is obtained through radiometrically-dated tephra layers (i.e., air fall deposits) within the section (Figure 1) originating from the adjacent Mt. Berlin. Fieldwork during the 1999-2000 field season included the trenching of the complete section with electric chain saws mounted on a wheeled frame. Blocks were extracted and cut-down to sample a continuous section from the 50-cm depth. Several overlapping trenches, some completed to a depth of 1 meter, were sampled to test the validity of sampling at the 50-cm depth. Individuals from New Mexico Tech, collaborators in the project, developed a detailed map of visible tephra layers using a GPS and collected additional tephra samples with the goal of dating layers not presently dated and for refining existing ages. Once samples were brought back to the lab, a glaciochemistry time series was developed for comparison with other such records from Antarctica as well as from Greenland ice cores. Through the use of an ion chromatograph, concentrations of the major ions found in the atmosphere are determined. The suite of chemical species measured includes Na2+, Ca2+, Mg2+, K+, NH4+, Cl-, SO42-, and NO3-. One sample per 20 cm of ice was analyzed over the last ~150k to obtain a coarsely-resolved record to test the reliability of the record. Figure 1 shows the relationship between the Na2+ time series and the location of the dated tephra layers, thus the age model developed for Trench A. A similarity in broad trends would suggest that Mt. Moulton ice contains a valid paleoclimatic record thereby warranting more detailed (i.e., a much higher resolution) sampling and analyses than done in this study. As this was a pilot project the only presentations made were at meetings of ... Text Antarc* Antarctic Antarctica Greenland Greenland ice cores West Antarctica The University of Maine: DigitalCommons@UMaine Antarctic West Antarctica Greenland |
institution |
Open Polar |
collection |
The University of Maine: DigitalCommons@UMaine |
op_collection_id |
ftmaineuniv |
language |
unknown |
topic |
Climate Change Climatology Antarctic Glaciology Climate Environmental Sciences Glaciology |
spellingShingle |
Climate Change Climatology Antarctic Glaciology Climate Environmental Sciences Glaciology Zielinski, Gregory A. Mayewski, Paul Andrew Examination of the 500,000-Year Climate Record in Ice at Mt. Moulton, West Antarctica |
topic_facet |
Climate Change Climatology Antarctic Glaciology Climate Environmental Sciences Glaciology |
description |
This project was a pilot project to determine if the ice on Mt. Moulton provides a reliable record of past climatic conditions. The area of study is a several hundred-meter section of blue ice (Trench A) that spans the time period from approximately the early Holocene to over 492k years ago. Dating control is obtained through radiometrically-dated tephra layers (i.e., air fall deposits) within the section (Figure 1) originating from the adjacent Mt. Berlin. Fieldwork during the 1999-2000 field season included the trenching of the complete section with electric chain saws mounted on a wheeled frame. Blocks were extracted and cut-down to sample a continuous section from the 50-cm depth. Several overlapping trenches, some completed to a depth of 1 meter, were sampled to test the validity of sampling at the 50-cm depth. Individuals from New Mexico Tech, collaborators in the project, developed a detailed map of visible tephra layers using a GPS and collected additional tephra samples with the goal of dating layers not presently dated and for refining existing ages. Once samples were brought back to the lab, a glaciochemistry time series was developed for comparison with other such records from Antarctica as well as from Greenland ice cores. Through the use of an ion chromatograph, concentrations of the major ions found in the atmosphere are determined. The suite of chemical species measured includes Na2+, Ca2+, Mg2+, K+, NH4+, Cl-, SO42-, and NO3-. One sample per 20 cm of ice was analyzed over the last ~150k to obtain a coarsely-resolved record to test the reliability of the record. Figure 1 shows the relationship between the Na2+ time series and the location of the dated tephra layers, thus the age model developed for Trench A. A similarity in broad trends would suggest that Mt. Moulton ice contains a valid paleoclimatic record thereby warranting more detailed (i.e., a much higher resolution) sampling and analyses than done in this study. As this was a pilot project the only presentations made were at meetings of ... |
format |
Text |
author |
Zielinski, Gregory A. Mayewski, Paul Andrew |
author_facet |
Zielinski, Gregory A. Mayewski, Paul Andrew |
author_sort |
Zielinski, Gregory A. |
title |
Examination of the 500,000-Year Climate Record in Ice at Mt. Moulton, West Antarctica |
title_short |
Examination of the 500,000-Year Climate Record in Ice at Mt. Moulton, West Antarctica |
title_full |
Examination of the 500,000-Year Climate Record in Ice at Mt. Moulton, West Antarctica |
title_fullStr |
Examination of the 500,000-Year Climate Record in Ice at Mt. Moulton, West Antarctica |
title_full_unstemmed |
Examination of the 500,000-Year Climate Record in Ice at Mt. Moulton, West Antarctica |
title_sort |
examination of the 500,000-year climate record in ice at mt. moulton, west antarctica |
publisher |
DigitalCommons@UMaine |
publishDate |
2002 |
url |
https://digitalcommons.library.umaine.edu/orsp_reports/126 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1130&context=orsp_reports |
geographic |
Antarctic West Antarctica Greenland |
geographic_facet |
Antarctic West Antarctica Greenland |
genre |
Antarc* Antarctic Antarctica Greenland Greenland ice cores West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica Greenland Greenland ice cores West Antarctica |
op_source |
University of Maine Office of Research Administration: Grant Reports |
op_relation |
https://digitalcommons.library.umaine.edu/orsp_reports/126 https://digitalcommons.library.umaine.edu/cgi/viewcontent.cgi?article=1130&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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