Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean
Thesis (Ph.D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2002. Includes bibliographical references (leaves 169-187). The marine geoch...
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ftmit:oai:dspace.mit.edu:1721.1/29060 2023-06-11T04:14:21+02:00 Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean Reuer, Matthew K. (Matthew Kindt), 1972- Edward A. Boyle. Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. 2002 187 leaves 12900533 bytes 12900286 bytes application/pdf http://hdl.handle.net/1721.1/29060 eng eng Massachusetts Institute of Technology http://hdl.handle.net/1721.1/29060 50632041 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 /Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Thesis 2002 ftmit 2023-05-29T08:55:53Z Thesis (Ph.D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2002. Includes bibliographical references (leaves 169-187). The marine geochemistry of the North Atlantic Ocean varies on decadal to centennial time scales, a consequence of natural and anthropogenic forcing. Surface corals provide a useful geochemical archive to quantify past mixed layer variability, and this study presents elemental and isotopic records from the tropical and subtropical North Atlantic. A consistent method for stable lead isotope analysis via multiple collector ICP-MS is first presented. This method is then applied to western North Atlantic surface corals and seawater, constraining historical elemental and isotopic lead variability. Six stable lead isotope profiles are developed from the western and eastern North Atlantic, demonstrating consistent mixed layer, thermocline, and deep water variability. Finally, coralline trace element records, including cadmium, barium, and lead, are presented from the Cariaco Basin. First, a reliable method is developed for stable lead isotope analysis by multiple collector ICP-MS. This study presents new observations of the large (0.7% amu-l), time-dependent mass fractionation determined by thallium normalization, including preferential light ion transmission induced by the acceleration potential and nebulizer conditions. These experiments show equivalent results for three empirical correction laws, and the previously proposed [beta]Pb/[beta]TI correction does not improve isotope ratio accuracy under these conditions. External secondary normalization to SRM-981 provides one simple alternative, and a rationale is provided for this correction. With current intensities less than 1.5x10-12 A, external isotope ratio precision less than 200 ppm is observed (2[sigma]). Matrix effects are significant with concomitant calcium in SRM-981 (-280 ppm ... Thesis North Atlantic DSpace@MIT (Massachusetts Institute of Technology) |
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/Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution |
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/Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Reuer, Matthew K. (Matthew Kindt), 1972- Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean |
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/Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution |
description |
Thesis (Ph.D.)--Joint Program in Oceanography/Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2002. Includes bibliographical references (leaves 169-187). The marine geochemistry of the North Atlantic Ocean varies on decadal to centennial time scales, a consequence of natural and anthropogenic forcing. Surface corals provide a useful geochemical archive to quantify past mixed layer variability, and this study presents elemental and isotopic records from the tropical and subtropical North Atlantic. A consistent method for stable lead isotope analysis via multiple collector ICP-MS is first presented. This method is then applied to western North Atlantic surface corals and seawater, constraining historical elemental and isotopic lead variability. Six stable lead isotope profiles are developed from the western and eastern North Atlantic, demonstrating consistent mixed layer, thermocline, and deep water variability. Finally, coralline trace element records, including cadmium, barium, and lead, are presented from the Cariaco Basin. First, a reliable method is developed for stable lead isotope analysis by multiple collector ICP-MS. This study presents new observations of the large (0.7% amu-l), time-dependent mass fractionation determined by thallium normalization, including preferential light ion transmission induced by the acceleration potential and nebulizer conditions. These experiments show equivalent results for three empirical correction laws, and the previously proposed [beta]Pb/[beta]TI correction does not improve isotope ratio accuracy under these conditions. External secondary normalization to SRM-981 provides one simple alternative, and a rationale is provided for this correction. With current intensities less than 1.5x10-12 A, external isotope ratio precision less than 200 ppm is observed (2[sigma]). Matrix effects are significant with concomitant calcium in SRM-981 (-280 ppm ... |
author2 |
Edward A. Boyle. Woods Hole Oceanographic Institution. Joint Program in Oceanography/Applied Ocean Science and Engineering. Massachusetts Institute of Technology. Dept. of Earth, Atmospheric, and Planetary Sciences. |
format |
Thesis |
author |
Reuer, Matthew K. (Matthew Kindt), 1972- |
author_facet |
Reuer, Matthew K. (Matthew Kindt), 1972- |
author_sort |
Reuer, Matthew K. (Matthew Kindt), 1972- |
title |
Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean |
title_short |
Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean |
title_full |
Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean |
title_fullStr |
Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean |
title_full_unstemmed |
Centennial-scale elemental and isotopic variability in the tropical and subtropical North Atlantic Ocean |
title_sort |
centennial-scale elemental and isotopic variability in the tropical and subtropical north atlantic ocean |
publisher |
Massachusetts Institute of Technology |
publishDate |
2002 |
url |
http://hdl.handle.net/1721.1/29060 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://hdl.handle.net/1721.1/29060 50632041 |
op_rights |
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 |
_version_ |
1768392297872883712 |