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Award Abstract #0851032 Collaborative Research: GEOTRACES­ Methods development and intercalibration for the 210 Pb
and 210 Po radionuclide pair
NSF Org:
OCE
Division of Ocean Sciences
Initial Amendment Date:
August 19, 2009
Latest Amendment Date:
August 19, 2009
Award Number:
Award Instrument:
Program Manager:
Start Date:
End Date:
Awarded Amount to Date:
Investigator(s):
Sponsor:
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Program Reference Code(s):
Program Element Code(s):
0851032
Standard Grant
Donald L. Rice
OCE Division of Ocean Sciences
GEO Directorate for Geosciences
August 15, 2009
July 31, 2012 (Estimated)
$85,000.00
Mark Baskaran [email protected] (Principal Investigator)
Wayne State University
5057 Woodward
Detroit, MI 48202­3622 (313)577­2424
CHEMICAL OCEANOGRAPHY
9150, 9189, 9198, EGCH
1670
ABSTRACT
Over the past three decades since GEOSECS, the naturally­occurring Po210­Pb210 natural radionuclide pair has had wide
application in studies of particulate scavenging and carbon flux in the ocean and at its boundaries. Not surprisingly,
measurement of this isotopic pair has been designated as a programmatic priority in the Principles and Priorities of the
U.S. GEOTRACES Intercalibration Initiative document. Intercalibration of trace elements and isotopes is the highest priority
for U.S. GEOTRACES during its first two to three years. In this project, researchers at the University of Delaware and Wayne State University will conduct a systematic
intercalibration effort to ensure that Pb210 and Po210 will be accurately measured under the GEOTRACES program. On the
first GEOTRACES Intercalibration Cruise in June 2008, a large integrated volume (250 L) of filtered and acidified sea water
was collected from the 2000 meter calibration depth for about a dozen Po210­Pb210 aliquots. Likewise particulate aliquots
were collected in common with other GEOTRACES radionuclides using in­situ pumps with various filter substrates, porosity
and filtration rates. These dissolved and particulate aliquots have been distributed to about a dozen international
investigators participating in the Po210­Pb210 intercalibration following their own protocols for processing and radionuclide
analyses. The investigators on this project will lead the effort to intercompare and synthesize the participants? results to
identify inconsistencies and recommend improvements. The proposed work will be closely coordinated with GEOTRACES PIs already funded to intercalibrate other particle­reactive
(e.g. Th, Pa) or dissolved (e.g. Ra) radionuclide isotopes. The broader impacts of this proposal are closely linked to the GEOTRACES Program as a whole and to the significance of
the Pb210­Po210 isotopic system as a research tool in a variety of oceanographic subdisciplines. The project will (1)
enhance research infrastructure by providing a User's Manual for the collection and radiochemical assay of Po210 and
Pb210, (2) provide for the support and training of graduate and undergraduate students, and (3) provide broad
dissemination of our research on dedicated public websites at the University of Delaware.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
Note: When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external site maintained by the
publisher. Some full text articles may not yet be available without a charge during the embargo (administrative interval). Some links on this page may take you to non­federal websites. Their policies may differ from this site. M. Baskaran. "Po­210 and Pb­210 as atmospheric tracers and global atmospheric Pb­210 fallout: a Review," Journal of
Environmental Radioactivity, v.102, 2011, p. 500. doi:doi:10.1016/j.jenvrad.2010.10.007 BOOKS/ONE TIME PROCEEDING
Mark Baskaran. "Po­210 and Pb­210 as Atmospheric Tracers", 08/15/2009­07/31/2010, , R. Garcia­Tenorio and E.
Holm"Special Issue", "Journal of Environmental Radioactivity".
M. Baskaran. "Dating of biogenic and inorganic carbonates using 210Pb­226Ra disequilibrium method: A
review.", 08/01/2010­07/31/2011, , Mark Baskaran"Handbook of Environmental Isotope Geochemistry", 2011, "p. 789­
810, Springer (ISBN: 978­3­642­10636­1).".
Please report errors in award information by writing to: [email protected].
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