Influences On The Oceanic Biogeochemical Cycling Of The Hybrid-Type Metals: Cobalt, Iron, And Manganese
Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micronutrients with oceanic distributions that are influenced by both biological and abiotic sources and sinks. Their open ocean concentrations range from pi...
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ftdtic:ADA558814 2023-05-15T13:48:14+02:00 Influences On The Oceanic Biogeochemical Cycling Of The Hybrid-Type Metals: Cobalt, Iron, And Manganese Noble, Abigail E MASSACHUSETTS INST OF TECH CAMBRIDGE JOINT PROGRAM IN APPLIED OCEAN SCIENCE AND ENGINEERING 2012-02 text/html http://www.dtic.mil/docs/citations/ADA558814 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA558814 en eng http://www.dtic.mil/docs/citations/ADA558814 Approved for public release; distribution is unlimited. DTIC Biochemistry Physical and Dynamic Oceanography Geology Geochemistry and Mineralogy *BIOCHEMISTRY *ECOSYSTEMS *METALS *OCEANS ABIOTIC PROCESSES ANTARCTIC REGIONS ARCTIC OCEAN BIOGEOGRAPHY BIOLOGICAL ABSORPTION BIOLOGY COBALT CYCLES DISSOLVING DISTRIBUTION DYNAMICS EQUATORIAL REGIONS FLUID DYNAMICS ICE INPUT MANGANESE MELTS MIXING PHOSPHATES REGIONS REMOVAL RIVERS SOUND SOURCES SOUTH ATLANTIC OCEAN SUBSURFACE THESES UPWELLING UTILIZATION VARIATIONS VOLUME WIND Text 2012 ftdtic 2016-02-23T10:43:31Z Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micronutrients 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 provided a basis for comparing the biogeochemical cycles of cobalt, iron, and manganese in three oceanic regimes (Hawaii, South Atlantic, McMurdo Sound). Text Antarc* Antarctic Antarctica Arctic Arctic Ocean McMurdo Sound South Atlantic Ocean Defense Technical Information Center: DTIC Technical Reports database Antarctic Arctic Arctic Ocean McMurdo Sound |
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Defense Technical Information Center: DTIC Technical Reports database |
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English |
topic |
Biochemistry Physical and Dynamic Oceanography Geology Geochemistry and Mineralogy *BIOCHEMISTRY *ECOSYSTEMS *METALS *OCEANS ABIOTIC PROCESSES ANTARCTIC REGIONS ARCTIC OCEAN BIOGEOGRAPHY BIOLOGICAL ABSORPTION BIOLOGY COBALT CYCLES DISSOLVING DISTRIBUTION DYNAMICS EQUATORIAL REGIONS FLUID DYNAMICS ICE INPUT MANGANESE MELTS MIXING PHOSPHATES REGIONS REMOVAL RIVERS SOUND SOURCES SOUTH ATLANTIC OCEAN SUBSURFACE THESES UPWELLING UTILIZATION VARIATIONS VOLUME WIND |
spellingShingle |
Biochemistry Physical and Dynamic Oceanography Geology Geochemistry and Mineralogy *BIOCHEMISTRY *ECOSYSTEMS *METALS *OCEANS ABIOTIC PROCESSES ANTARCTIC REGIONS ARCTIC OCEAN BIOGEOGRAPHY BIOLOGICAL ABSORPTION BIOLOGY COBALT CYCLES DISSOLVING DISTRIBUTION DYNAMICS EQUATORIAL REGIONS FLUID DYNAMICS ICE INPUT MANGANESE MELTS MIXING PHOSPHATES REGIONS REMOVAL RIVERS SOUND SOURCES SOUTH ATLANTIC OCEAN SUBSURFACE THESES UPWELLING UTILIZATION VARIATIONS VOLUME WIND Noble, Abigail E Influences On The Oceanic Biogeochemical Cycling Of The Hybrid-Type Metals: Cobalt, Iron, And Manganese |
topic_facet |
Biochemistry Physical and Dynamic Oceanography Geology Geochemistry and Mineralogy *BIOCHEMISTRY *ECOSYSTEMS *METALS *OCEANS ABIOTIC PROCESSES ANTARCTIC REGIONS ARCTIC OCEAN BIOGEOGRAPHY BIOLOGICAL ABSORPTION BIOLOGY COBALT CYCLES DISSOLVING DISTRIBUTION DYNAMICS EQUATORIAL REGIONS FLUID DYNAMICS ICE INPUT MANGANESE MELTS MIXING PHOSPHATES REGIONS REMOVAL RIVERS SOUND SOURCES SOUTH ATLANTIC OCEAN SUBSURFACE THESES UPWELLING UTILIZATION VARIATIONS VOLUME WIND |
description |
Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micronutrients 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 provided a basis for comparing the biogeochemical cycles of cobalt, iron, and manganese in three oceanic regimes (Hawaii, South Atlantic, McMurdo Sound). |
author2 |
MASSACHUSETTS INST OF TECH CAMBRIDGE JOINT PROGRAM IN APPLIED OCEAN SCIENCE AND ENGINEERING |
format |
Text |
author |
Noble, Abigail E |
author_facet |
Noble, Abigail E |
author_sort |
Noble, Abigail E |
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 |
publishDate |
2012 |
url |
http://www.dtic.mil/docs/citations/ADA558814 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA558814 |
geographic |
Antarctic Arctic Arctic Ocean McMurdo Sound |
geographic_facet |
Antarctic Arctic Arctic Ocean McMurdo Sound |
genre |
Antarc* Antarctic Antarctica Arctic Arctic Ocean McMurdo Sound South Atlantic Ocean |
genre_facet |
Antarc* Antarctic Antarctica Arctic Arctic Ocean McMurdo Sound South Atlantic Ocean |
op_source |
DTIC |
op_relation |
http://www.dtic.mil/docs/citations/ADA558814 |
op_rights |
Approved for public release; distribution is unlimited. |
_version_ |
1766249019888107520 |