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Research Spending & Results

Award Detail

Awardee:WOODS HOLE OCEANOGRAPHIC INSTITUTION
Doing Business As Name:Woods Hole Oceanographic Institution
PD/PI:
  • Phoebe J Lam
  • (831) 459-4587
  • pjlam@ucsc.edu
Co-PD(s)/co-PI(s):
  • Ken O Buesseler
  • Henrietta Dulai
Award Date:09/04/2007
Estimated Total Award Amount: $ NaN
Funds Obligated to Date: $ 499,998
  • FY 2007=$499,998
Start Date:09/15/2007
End Date:01/31/2011
Transaction Type:Grant
Agency:NSF
Awarding Agency Code:4900
Funding Agency Code:4900
CFDA Number:47.050
Primary Program Source:490100 NSF RESEARCH & RELATED ACTIVIT
Award Title or Description:Sources of Iron to the Eastern Tropical Atlantic: Does the Continental Margin Supplement Saharan Dust?
Federal Award ID Number:0726367
DUNS ID:001766682
Parent DUNS ID:001766682
Program:CHEMICAL OCEANOGRAPHY
Program Officer:
  • Donald L. Rice
  • (703) 292-8582
  • drice@nsf.gov

Awardee Location

Street:183 OYSTER POND ROAD
City:WOODS HOLE
State:MA
ZIP:02543-1041
County:Woods Hole
Country:US
Awardee Cong. District:09

Primary Place of Performance

Organization Name:Woods Hole Oceanographic Institution
Street:183 OYSTER POND ROAD
City:WOODS HOLE
State:MA
ZIP:02543-1041
County:Woods Hole
Country:US
Cong. District:09

Abstract at Time of Award

Iron, a necessary micronutrient used during primary production in the ocean, enters the tropical North Atlantic through various external sources including river runoff, atmospheric dust, and continental margins, but deposition of atmospheric dust is the primary source of this element to this region. However, despite seasonal fluctuation in the magnitude and path of atmospheric dust delivery, persistent depletion of surface nutrients and moderately high ocean color indicates that other source(s) are providing iron to this area. Scientists from Woods Hole Oceanographic Institute plan to test the hypothesis that the continental margin of northwest Africa provides a significant subsurface supply of iron to the eastern tropical Atlantic that supplements dust. To test this hypothesis, the principal investigators would use a novel combination of measurements (i.e., synchrotron x-ray analysis of particulate iron, radium isotopes, 234Th profiles) during a wintertime visit to the new Tropical Eastern North Atlantic Time-Series Observatory (TENATSO) near Cape Verde, located in the eastern tropical Atlantic about 850 km downstream of Mauritanian coastal upwelling, and a summertime cross-shelf transect from the Mauritanian coast to TENATSO with a scientist from Massachusetts Institute of Technology. It is anticipated that the cross shelf transect and the proposed measurements would allow them to determine the importance of lateral transport versus dust inputs and subsurface remineralization as iron sources to the surface ocean. As regards broader impacts, the research would provide new insight into the importance of lateral sources of bioavailable iron to the tropical North Atlantic. Scientists from Woods Hole Oceanographic Institution plan to collaborate with those in the Cape Verde Islands, train the researchers in how to determine thorium, radium, and iron, and disseminate results from the study via presentations at the Instituto National de Desenvolvimento das Pescas.

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