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Award Abstract #1031198

Late Quaternary Variability of the Agulhas Thermohaline Valve from Nd Isotopes in Planktonic Foraminifera

NSF Org: OCE
Division Of Ocean Sciences
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Initial Amendment Date: August 30, 2010
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Latest Amendment Date: August 30, 2010
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Award Number: 1031198
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Award Instrument: Standard Grant
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Program Manager: Candace O. Major
OCE Division Of Ocean Sciences
GEO Directorate For Geosciences
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Start Date: September 1, 2010
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End Date: August 31, 2014 (Estimated)
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Awarded Amount to Date: $236,132.00
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Investigator(s): Leopoldo Pena Gonzalez leopoldo@ldeo.columbia.edu (Principal Investigator)
Steven Goldstein (Co-Principal Investigator)
Sidney Hemming (Co-Principal Investigator)
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Sponsor: Columbia University
2960 Broadway
NEW YORK, NY 10027-6902 (212)854-6851
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NSF Program(s): MARINE GEOLOGY AND GEOPHYSICS
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Program Reference Code(s): 0000, 1620, OTHR
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Program Element Code(s): 1620

ABSTRACT

As a component of the shallow warm water return route of the "great ocean conveyor", and as the largest western boundary current in the world ocean, the Agulhas Current plans an important role in the transfer of heat and salt into the Atlantic Ocean. This "leakage" of Indian Ocean waters into the South Atlantic contributes to increased salinification of the thermocline. This preconditioning effect provides a positive feedback for North Atlantic Deep Water (NADW) formation, and thereby may play a critical role in driving the Meridional Overturning Circulation. This research investigates changes in the "Agulhas Leakage" (AL) over the last 30,000 years, seeking to better constrain the role that the oceanic water exchange via leakage had in past climate changes as an active player in major circulatory changes in the Atlantic. The neodymium isotopic composition of planktonic foraminifera will be used to reconstruct changes in the Agulhas Leakage intensity and position. The research centers around four hypotheses: 1) the AL is greater during warmer climate periods (and vice versa), 2) increases in AL contributed to increases in NADW export during the deglaciation, 3) decreases in AL contributed to decreased NADW export during the climate transition of the last glacial period, and 4) the position of the Agulhas retroflection was the same during the Holocene and LGM. Funding supports a postdoctoral researcher and application of a new paleoceanographic proxy.


PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH

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Eva Calvo, Carles Pelejero, Leopoldo D. Pena, Isabel Cacho, and Graham A. Logan. "Eastern Equatorial Pacific productivity and related CO2 changes since the last glacial period," PNAS, v.18, 2011, p. 5537. 

Pena, L.D., Goldstein, S.L., Hemming, S.R., Jones, K.M., Calvo, E., Pelejero, C. and Cacho, I.. "Rapid changes in meridional advection of Southern Ocean
intermediate waters to the tropical Pacific during the last 30 kyr," Earth and Planetary Science Letters, v.368, 2013, p. 20. 

Pena, L.D. and Goldstein S.L.. "Thermohaline circulation crisis and impacts during the mid-Pleistocene transition," Science, v.345, 2014, p. 318. 

Pena, L.D., Goldstein, S.L., Hemming, S.R., Jones, K.M., Calvo, E., Pelejero, C. and Cacho, I.. "Rapid changes in meridional advection of Southern Ocean intermediate waters to the tropical Pacific during the last 30 kyr," Earth and Planetary Science Letters, v.368, 2013, p. 20. 

BOOKS/ONE TIME PROCEEDING

Pena, L.D., Goldstein, S.L., Hemming, S.R., Jones, K.M., Calvo, E., Pelejero, C. and Cacho, I.. "Rapid Variability in the Advection of Southern Ocean Intermediate Waters to the Tropics During the
last deglaciation
", 09/01/2011-08/31/2012, , American Geophysical Union"Abstract",  2012, "Proceedings of the American Geophysical Union".

 

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