The biogeochemistry of marine particulate trace metals
Thesis: Ph. D., Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2014. Cataloged from PDF version of thesis. Includes bibliographical references. Marine particles in...
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ftmit:oai:dspace.mit.edu:1721.1/87512 2023-06-11T04:14:55+02:00 The biogeochemistry of marine particulate trace metals Ohnemus, Daniel Chester Phoebe J. Lam. Woods Hole Oceanographic Institution. Joint Program in Chemical Oceanography Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences 2014 180 pages application/pdf http://hdl.handle.net/1721.1/87512 eng eng Massachusetts Institute of Technology http://hdl.handle.net/1721.1/87512 879674058 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 Joint Program in Chemical Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Thesis 2014 ftmit 2023-05-29T08:52:43Z Thesis: Ph. D., Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2014. Cataloged from PDF version of thesis. Includes bibliographical references. Marine particles include all living and non-living solid components of seawater, representing an extremely dynamic and chemically diverse mixture of phases. The distributions of these phases are poorly constrained and undersampled in the oceans, despite interactions between living organisms and non-living minerals having central roles within many globally relevant biogeochemical processes. Through a combination of method development, basin-scale particulate collection and analyses, modeling, and field experiments, this thesis examines both the distributions of marine particulate trace metals and the underlying processes-inputs, scavenging, vertical and horizontal transport, and biotic uptake-in which marine particles participate. I first present the results of an intercalibration exercise among several US laboratories that analyzed filtered particles on shared polyethersulfone filters. We use inter-lab and intra-lab total elemental recoveries of these particles to determine our state of our intercalibration (</= 21% one-sigma inter-lab uncertainty for most elements; 9% intra-lab) and to identify means of future improvement. We also present a new chemical method for complete dissolution of polyethersulfone filters and compare it to other total particle digestion procedures. I then present the marine particulate distributions of the lithogenic elements Al, Fe, and Ti in the North Atlantic GEOTRACES section. Inputs of lithogenic particles from African dust sources, hydrothermal systems, benthic nepheloid layers and laterally-sourced margin influences are observed and discussed. Lithogenic particle residence times, size-fractionation patterns, Ti-mineral speciation, and relationships to biological aggregation processes are ... Thesis North Atlantic DSpace@MIT (Massachusetts Institute of Technology) |
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Joint Program in Chemical Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution |
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Joint Program in Chemical Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Ohnemus, Daniel Chester The biogeochemistry of marine particulate trace metals |
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Joint Program in Chemical Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution |
description |
Thesis: Ph. D., Joint Program in Chemical Oceanography (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2014. Cataloged from PDF version of thesis. Includes bibliographical references. Marine particles include all living and non-living solid components of seawater, representing an extremely dynamic and chemically diverse mixture of phases. The distributions of these phases are poorly constrained and undersampled in the oceans, despite interactions between living organisms and non-living minerals having central roles within many globally relevant biogeochemical processes. Through a combination of method development, basin-scale particulate collection and analyses, modeling, and field experiments, this thesis examines both the distributions of marine particulate trace metals and the underlying processes-inputs, scavenging, vertical and horizontal transport, and biotic uptake-in which marine particles participate. I first present the results of an intercalibration exercise among several US laboratories that analyzed filtered particles on shared polyethersulfone filters. We use inter-lab and intra-lab total elemental recoveries of these particles to determine our state of our intercalibration (</= 21% one-sigma inter-lab uncertainty for most elements; 9% intra-lab) and to identify means of future improvement. We also present a new chemical method for complete dissolution of polyethersulfone filters and compare it to other total particle digestion procedures. I then present the marine particulate distributions of the lithogenic elements Al, Fe, and Ti in the North Atlantic GEOTRACES section. Inputs of lithogenic particles from African dust sources, hydrothermal systems, benthic nepheloid layers and laterally-sourced margin influences are observed and discussed. Lithogenic particle residence times, size-fractionation patterns, Ti-mineral speciation, and relationships to biological aggregation processes are ... |
author2 |
Phoebe J. Lam. Woods Hole Oceanographic Institution. Joint Program in Chemical Oceanography Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
format |
Thesis |
author |
Ohnemus, Daniel Chester |
author_facet |
Ohnemus, Daniel Chester |
author_sort |
Ohnemus, Daniel Chester |
title |
The biogeochemistry of marine particulate trace metals |
title_short |
The biogeochemistry of marine particulate trace metals |
title_full |
The biogeochemistry of marine particulate trace metals |
title_fullStr |
The biogeochemistry of marine particulate trace metals |
title_full_unstemmed |
The biogeochemistry of marine particulate trace metals |
title_sort |
biogeochemistry of marine particulate trace metals |
publisher |
Massachusetts Institute of Technology |
publishDate |
2014 |
url |
http://hdl.handle.net/1721.1/87512 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://hdl.handle.net/1721.1/87512 879674058 |
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_ |
1768371295885459456 |