Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese
Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2012. Cataloged from PDF version of thesis. Includes bibliographical references. Trace metal cycling is one of ma...
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ftmit:oai:dspace.mit.edu:1721.1/70779 2023-06-11T04:06:26+02:00 Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese Noble, Abigail Emery . Woods Hole Oceanographic Institution. Joint Program in Oceanography Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences n-us-hi t --- r --- 2012 296 p. application/pdf http://hdl.handle.net/1721.1/70779 eng eng Massachusetts Institute of Technology http://hdl.handle.net/1721.1/70779 792737718 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 Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Nutrient cycles Ocean circulation Thesis 2012 ftmit 2023-05-29T08:31:15Z Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2012. Cataloged from PDF version of thesis. Includes bibliographical references. Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micro-nutrients with oceanic distributions that are influenced by both biological and abiotic sources and sinks. Their open ocean concentrations range from picomolar to nanomolar, and their bioavailabilities can impact primary production. Understanding the biogeochemical cycling of these hybrid-type metals with an emphasis on cobalt was the focus of this thesis. This was accomplished by determining the dissolved distributions of these metals in oceanic regions that were characterized by different dominant biogeochemistries. A large subsurface plume of dissolved cobalt, iron, and manganese was found in the Eastern South Atlantic. The cause of this plume is a combination of reductive dissolution in coastal sediments, wind-driven upwelling, advection, biological uptake, and remineralization. Additional processes that are discussed as sources of metals to the regions studied during this thesis include isopycnal uplift within cold-core eddies (Hawaii), ice melt (McMurdo Sound, Antarctica), riverine input (Arctic Ocean), and winter mixing (McMurdo Sound). The biological influence on surface ocean distributions of cobalt was apparent by the observation of linear relationships between cobalt and phosphate in mid to low latitudes. The cobalt:phosphate ratios derived from these correlations changed over orders of magnitude, revealing dynamic variability in the utilization, demand, and sources of this micronutrient. Speciation studies suggest that there may be two classes of cobalt binding ligands, and that organic complexation plays an important role in preventing scavenging of cobalt in the ocean. These datasets ... Thesis Antarc* Antarctica Arctic Arctic Ocean McMurdo Sound DSpace@MIT (Massachusetts Institute of Technology) Arctic Arctic Ocean McMurdo Sound |
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Open Polar |
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DSpace@MIT (Massachusetts Institute of Technology) |
op_collection_id |
ftmit |
language |
English |
topic |
Joint Program in Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Nutrient cycles Ocean circulation |
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Joint Program in Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Nutrient cycles Ocean circulation Noble, Abigail Emery Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese |
topic_facet |
Joint Program in Oceanography Earth Atmospheric and Planetary Sciences Woods Hole Oceanographic Institution Nutrient cycles Ocean circulation |
description |
Thesis (Ph. D.)--Joint Program in Oceanography (Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2012. Cataloged from PDF version of thesis. Includes bibliographical references. Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micro-nutrients with oceanic distributions that are influenced by both biological and abiotic sources and sinks. Their open ocean concentrations range from picomolar to nanomolar, and their bioavailabilities can impact primary production. Understanding the biogeochemical cycling of these hybrid-type metals with an emphasis on cobalt was the focus of this thesis. This was accomplished by determining the dissolved distributions of these metals in oceanic regions that were characterized by different dominant biogeochemistries. A large subsurface plume of dissolved cobalt, iron, and manganese was found in the Eastern South Atlantic. The cause of this plume is a combination of reductive dissolution in coastal sediments, wind-driven upwelling, advection, biological uptake, and remineralization. Additional processes that are discussed as sources of metals to the regions studied during this thesis include isopycnal uplift within cold-core eddies (Hawaii), ice melt (McMurdo Sound, Antarctica), riverine input (Arctic Ocean), and winter mixing (McMurdo Sound). The biological influence on surface ocean distributions of cobalt was apparent by the observation of linear relationships between cobalt and phosphate in mid to low latitudes. The cobalt:phosphate ratios derived from these correlations changed over orders of magnitude, revealing dynamic variability in the utilization, demand, and sources of this micronutrient. Speciation studies suggest that there may be two classes of cobalt binding ligands, and that organic complexation plays an important role in preventing scavenging of cobalt in the ocean. These datasets ... |
author2 |
. Woods Hole Oceanographic Institution. Joint Program in Oceanography Woods Hole Oceanographic Institution Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences |
format |
Thesis |
author |
Noble, Abigail Emery |
author_facet |
Noble, Abigail Emery |
author_sort |
Noble, Abigail Emery |
title |
Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese |
title_short |
Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese |
title_full |
Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese |
title_fullStr |
Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese |
title_full_unstemmed |
Influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese |
title_sort |
influences on the oceanic biogeochemical cycling of the hybrid-type metals, cobalt, iron, and manganese |
publisher |
Massachusetts Institute of Technology |
publishDate |
2012 |
url |
http://hdl.handle.net/1721.1/70779 |
op_coverage |
n-us-hi t --- r --- |
geographic |
Arctic Arctic Ocean McMurdo Sound |
geographic_facet |
Arctic Arctic Ocean McMurdo Sound |
genre |
Antarc* Antarctica Arctic Arctic Ocean McMurdo Sound |
genre_facet |
Antarc* Antarctica Arctic Arctic Ocean McMurdo Sound |
op_relation |
http://hdl.handle.net/1721.1/70779 792737718 |
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_ |
1768378395519877120 |