| NSF Org: |
OCE Division Of Ocean Sciences |
| Recipient: |
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| Initial Amendment Date: | August 3, 2012 |
| Latest Amendment Date: | August 3, 2012 |
| Award Number: | 1233155 |
| Award Instrument: | Standard Grant |
| Program Manager: |
Henrietta Edmonds
hedmonds@nsf.gov (703)292-7427 OCE Division Of Ocean Sciences GEO Directorate for Geosciences |
| Start Date: | September 1, 2012 |
| End Date: | August 31, 2016 (Estimated) |
| Total Intended Award Amount: | $449,948.00 |
| Total Awarded Amount to Date: | $449,948.00 |
| Funds Obligated to Date: |
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| History of Investigator: |
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| Recipient Sponsored Research Office: |
1251 MEMORIAL DR CORAL GABLES FL US 33146-2509 (305)421-4089 |
| Sponsor Congressional District: |
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| Primary Place of Performance: |
4600 Rickenbacker Cswy Key Biscayne FL US 33149-1031 |
| Primary Place of
Performance Congressional District: |
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| Unique Entity Identifier (UEI): |
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| Parent UEI: |
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| NSF Program(s): | Chemical Oceanography |
| Primary Program Source: |
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| Program Reference Code(s): |
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| Program Element Code(s): |
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| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
A scientist from the University of Miami Rosenstiel School of Marine and Atmospheric Science plans to participate in the 2013 GEOTRACES Eastern Pacific Zonal transect cruise to determine the vertical distribution of dissolved (<0.2 µm) iron, manganese, zinc, copper, and cadmium in samples obtained between the East Pacific Rise and Tahiti. In addition, measurements of soluble (<10 kilo Daltons) and colloidal iron will be made on all samples collected during the cruise track from Peru to Tahiti. Results from this study will be used to determine the influence of hydrothermal vents on the source and sink of the above mentioned elements and to understand the role of colloid iron in the transport of hydrothermal iron, as well as the cycling of iron in the oligotrophic South Pacific and low oxygen waters near the continental margin off Peru.
In terms of the broader impacts, it is anticipated that results from the project will be incorporated into lecture material for classes. One graduate student will be supported and trained as part of this project.
PROJECT OUTCOMES REPORT
Disclaimer
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
We observed a large input of dissolved Fe, Mn and Zn from deep sea hydrothermal vents of the East Pacific Rise to the deep Pacific Ocean as shown by the coincidence of dissolved Fe, Mn and excess Zn cocnentrations with the mantle derived helium-3 along a 4000 km transect from the East Pacific Rise westward (Fig. 1). Much of the hydrothermal dissolved Fe input is via the supply of 300 kDa-0.2 micron size macro colloids from the hydrothermal vents (Fig. 2). There is a limited influence of hydrothermal activities on dissolved Cd and Cu distribution in the deep sea. However, there is a deficit of dissolved Cd relative to phosphate at 200-400 m depth range as shown by negative Cd* that appears to result from the subduction of Cd deplete water from the Polar Front Zone, and a colloidal Cu signal in the water column that may result from Cu complexation by colloidal organic ligands.
This Project Outcomes Report for the General Public is displayed verbatim as submitted by the Principal Investigator (PI) for this award. Any opinions, findings, and conclusions or recommendations expressed in this Report are those of the PI and do not necessarily reflect the views of the National Science Foundation; NSF has not approved or endorsed its content.
Last Modified: 09/11/2016
Modified by: Jingfeng Wu
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