2026-09-21T15:02:36Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/906632022-01-13T07:53:59Zcom_1721.1_7582com_1721.1_7581col_1721.1_131024
David McGee.
Fujimori, Jessica E. (Jessica Eileen)
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences.
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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2014-10-08T15:21:16Z
2014-10-08T15:21:16Z
2010
2014
http://hdl.handle.net/1721.1/90663
890404668
Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, June 2014.
"May 12, 2014." Cataloged from PDF version of thesis.
Includes bibliographical references (page 20).
We measured IRD fluxes from 22-5 ka BP in two sediment cores from the Scotia Sea using two different methods. The first, commonly used method, uses the linear sedimentation rate (LSR), dry bulk density, and weight percent of IRD in the sample. The second uses ²³⁰ThTh normalization, which has been proposed as an improved way to determine sediment fluxes in sites with significant lateral redistribution. We found that IRD fluxes calculated using the LSR produced a chronology in closer agreement with prior studies than those calculated using ²³⁰ThTh normalization. Based on the differences in records between the two cores, we conclude that IRD flux records more likely provide information about local ice sheet dynamics than about ice sheet behavior as a whole. IRD flux records may be influenced by differences in local sediment focusing, currents, and distance from the ice sheet.
by Jessica E. Fujimori.
S.B.
20 pages
eng
Massachusetts Institute of Technology
M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.
http://dspace.mit.edu/handle/1721.1/7582
Earth, Atmospheric, and Planetary Sciences.
Ice-rafted debris in the Southern Ocean : potential uses and limitations of ²³⁰Th-normalized fluxes
Potential uses and limitations of ²³⁰Th-normalized fluxes
Thesis
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Publication
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<Title>Ice-rafted debris in the Southern Ocean : potential uses and limitations of ²³⁰Th-normalized fluxes</Title>
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<Abstract>We measured IRD fluxes from 22-5 ka BP in two sediment cores from the Scotia Sea using two different methods. The first, commonly used method, uses the linear sedimentation rate (LSR), dry bulk density, and weight percent of IRD in the sample. The second uses ²³⁰ThTh normalization, which has been proposed as an improved way to determine sediment fluxes in sites with significant lateral redistribution. We found that IRD fluxes calculated using the LSR produced a chronology in closer agreement with prior studies than those calculated using ²³⁰ThTh normalization. Based on the differences in records between the two cores, we conclude that IRD flux records more likely provide information about local ice sheet dynamics than about ice sheet behavior as a whole. IRD flux records may be influenced by differences in local sediment focusing, currents, and distance from the ice sheet.</Abstract>
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