| NSF Org: |
OPP Office of Polar Programs (OPP) |
| Recipient: |
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| Initial Amendment Date: | August 14, 2013 |
| Latest Amendment Date: | August 28, 2015 |
| Award Number: | 1246702 |
| Award Instrument: | Continuing Grant |
| Program Manager: |
Paul Cutler
pcutler@nsf.gov (703)292-4961 OPP Office of Polar Programs (OPP) GEO Directorate for Geosciences |
| Start Date: | October 1, 2013 |
| End Date: | March 31, 2017 (Estimated) |
| Total Intended Award Amount: | $378,601.00 |
| Total Awarded Amount to Date: | $419,876.00 |
| Funds Obligated to Date: |
FY 2014 = $255,523.00 FY 2015 = $25,000.00 |
| History of Investigator: |
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| Recipient Sponsored Research Office: |
1109 GEDDES AVE STE 3300 ANN ARBOR MI US 48109-1015 (734)763-6438 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
MI US 48109-1005 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): | ANT Glaciology |
| Primary Program Source: |
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| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.078 |
ABSTRACT
1246702/Aciego
This award supports a collaborative project to analyze ice from the Taylor Dome core and exposed ice from Taylor Glacier to measure variations in the isotopic composition of Strontium, Neodymium, and Hafnium, trace element concentrations, major anions and cations, and dust size data in order to assign provenance of dust within the ice. The intellectual merit of the proposed work is to provide provenance information that will be used to investigate the dust flux response to large, rapid regional and global (hemispheric) climate changes on a millenia scale. The first part of the work will focus on ice from the Taylor Dome core and then transition to surface ice from Taylor Glacier. The PIs will collect large-sized samples of known age based on the methane and oxygen isotope composition of the trapped gases; samples will be large enough to carry out measurements on different size fractions. Parallel work will be done to determine the radiogenic isotope values of southern hemisphere (New Zealand, Australia, South Africa) and local (Northern and Southern Victoria Land) dust source material that are potentially entrained and deposited across the Taylor Dome region. The broader impacts of this research encompass collaborative, outreach, educational, and diversity initiatives. The work will be an international collaboration with researchers at the University of Michigan, Ohio State University, Università Milano-Bicocca, and Università di Pisa, the latter two in Italy. Dissemination of research findings will include both scientific forums and public lectures. Funding will provide support for one PhD student, one MS student, and at least one undergraduate student. The project participants will be involved in the new UC Irvine American Indian Summer School in Earth System Science for high school students using this project as a jumping off point for discussing polar issues and climate change. This award has field work in Antarctica
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
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PROJECT OUTCOMES REPORT
Disclaimer
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
Mineral dust is an important component of the climate system and ingredient in biogeochemical cycles, and can be used to identify past changes in dust source regions and prevailing winds. In this project, we characterized the physical and chemical characteristics of dust deposited in ice from the Taylor Glacier in East Antarctica to produce the first high-resolution, multi-millennial record of dust during the transition from the Last Glacial period to the early Holocene. Using analyses of dust concentration, particle size distribution, rare earth concentrations and isotopic compositions of Taylor Glacier ice, we demonstrate that the deglacial climate transition was accompanied by a change in the dust composition associated with changes in the atmospheric pathways of dust transport. During the Last Glacial period, southern South America was the dominant dust source. The dust provenance shifted following deglaciation to a source that was increasingly comprised of local Ross Sea dust sources. This transition likely coincided with deglacial retreat of the Ross Sea Ice Shelf and exposure of local dust sources. This project also contributed to increasing diversity in STEM fields and the polar sciences specifically. Six students and their advisors participated in the Society for the Advancement of Chicanos/Hispanics and Native Americans in Science Conference in Washington D.C.
Last Modified: 11/21/2017
Modified by: Sarah Aciego
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