Determination of sediment provenance at drift sites using hydrogen isotopes in lipids
Thesis (S.M.)--Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2004.
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| Format: | Thesis |
| Language: | eng |
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Massachusetts Institute of Technology
2010
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| Online Access: | http://hdl.handle.net/1721.1/58443 |
| _version_ | 1826216581664866304 |
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| author | Englebrecht, Amy C. (Amy Cathryn), 1978- |
| author2 | Julian P. Sachs. |
| author_facet | Julian P. Sachs. Englebrecht, Amy C. (Amy Cathryn), 1978- |
| author_sort | Englebrecht, Amy C. (Amy Cathryn), 1978- |
| collection | MIT |
| description | Thesis (S.M.)--Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2004. |
| first_indexed | 2024-09-23T16:49:51Z |
| format | Thesis |
| id | mit-1721.1/58443 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T16:49:51Z |
| publishDate | 2010 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/584432022-01-14T20:20:05Z Determination of sediment provenance at drift sites using hydrogen isotopes in lipids Englebrecht, Amy C. (Amy Cathryn), 1978- Julian P. Sachs. Woods Hole Oceanographic Institution. Woods Hole Oceanographic Institution Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Thesis (S.M.)--Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2004. Includes bibliographical references. Paleoclimate records with sufficient length and temporal resolution to study the occurrence and causal mechanisms of abrupt climate change are exceedingly rare. Rapidly deposited ocean sediments provide the best archive for studying these events through geologic time, but such sites in the open ocean are limited to sediment drift deposits such as the Bermuda Rise in the northwest Atlantic. Using multiple climate proxies in a single core is becoming more common in high-resolution paleoclimate investigations, but a major potential concern for this approach arises from the possibility that the fine fraction of sediment (< 63 [micro]m), and the climate proxies within it, may represent conditions far from the deposition site. We hypothesize that hydrogen isotope ratios of alkenones, a class of lipids from phytoplankton, may provide insight into the source of fine fraction sediment. Because of their restricted sources, broad geographic distribution, and excellent preservation properties, alkenones are of particular interest in the emerging field of' compound-specific hydrogen isotopic analysis, and the sedimentary abundances, extents of unsaturations, and isotopic compositions of alkenones provide quantitative and near-continuous records. We isolated alkenones from cultured unicellular algae (haptophyte Emiliania huxleyi), surface ocean particulate material, and open ocean sediments to determine the extent and variability of hydrogen isotopic fractionation in the di-, tri-, and tetraunsaturated C₃₇ compounds. We then compared the [delta]D of the alkenones in surface sediments between the Bermuda Rise and the Scotian Margin above which a large ([approximately]20%) [delta]D gradient exists. We determined the fractionation between alkenones (cont.) from suspended particulate samples and the water in which the phytoplanton lived, and examined the variability of alkenone 6D during key climate transitions at the Bermuda Rise. by Amy C. Englebrecht. S.M. 2010-09-03T18:52:40Z 2010-09-03T18:52:40Z 2004 2004 Thesis http://hdl.handle.net/1721.1/58443 57560539 eng 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 57 leaves application/pdf Massachusetts Institute of Technology |
| spellingShingle | Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. Englebrecht, Amy C. (Amy Cathryn), 1978- Determination of sediment provenance at drift sites using hydrogen isotopes in lipids |
| title | Determination of sediment provenance at drift sites using hydrogen isotopes in lipids |
| title_full | Determination of sediment provenance at drift sites using hydrogen isotopes in lipids |
| title_fullStr | Determination of sediment provenance at drift sites using hydrogen isotopes in lipids |
| title_full_unstemmed | Determination of sediment provenance at drift sites using hydrogen isotopes in lipids |
| title_short | Determination of sediment provenance at drift sites using hydrogen isotopes in lipids |
| title_sort | determination of sediment provenance at drift sites using hydrogen isotopes in lipids |
| topic | Earth, Atmospheric, and Planetary Sciences. Woods Hole Oceanographic Institution. |
| url | http://hdl.handle.net/1721.1/58443 |
| work_keys_str_mv | AT englebrechtamycamycathryn1978 determinationofsedimentprovenanceatdriftsitesusinghydrogenisotopesinlipids |