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Low reservoir ages for the surface ocean from mid-Holocene Florida corals

Fruffel, Ellen R. M. and Robinson, Laura F. and Griffin, Sheila and Halley, Robert B. and Southon, John R. and Adkins, Jess F. (2008) Low reservoir ages for the surface ocean from mid-Holocene Florida corals. Paleoceanography, 23 . Art. No. PA2209. ISSN 0883-8305. https://resolver.caltech.edu/CaltechAUTHORS:20120828-140427479

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Abstract

The ^(14)C reservoir age of the surface ocean was determined for two Holocene periods (4908–4955 and 3008–3066 calendar (cal) B.P.) using U/Th-dated corals from Biscayne National Park, Florida, United States. We found that the average reservoir ages for these two time periods (294 ± 33 and 291 ± 27 years, respectively) were lower than the average value between A.D. 1600 and 1900 (390 ± 60 years) from corals. It appears that the surface ocean was closer to isotopic equilibrium with CO_2 in the atmosphere during these two time periods than it was during recent times. Seasonal δ^(18)O measurements from the younger coral are similar to modern values, suggesting that mixing with open ocean waters was indeed occurring during this coral's lifetime. Likely explanations for the lower reservoir age include increased stratification of the surface ocean or increased Δ^(14)C values of subsurface waters that mix into the surface. Our results imply that a more correct reservoir age correction for radiocarbon measurements of marine samples in this location from the time periods ∼3040 and ∼4930 cal years B.P. is ∼292 ± 30 years, less than the canonical value of 404 ± 20 years.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1029/2007PA001527, 2008DOIUNSPECIFIED
http://www.agu.org/journals/pa/pa0802/2007PA001527/PublisherUNSPECIFIED
ORCID:
AuthorORCID
Southon, John R.0000-0001-6168-6235
Adkins, Jess F.0000-0002-3174-5190
Additional Information:© 2008 American Geophysical Union. Received 26 July 2007; accepted 1 February 2008; published 13 May 2008. We thank Tom Guilderson and associates at CAMS for help with the AMS measurements and Rindy Ostermann at WHOI for the stable isotope measurements. We are grateful to Wally Broecker and an anonymous reviewer for their comments on the manuscript. NSF Chemical Oceanography program provided monetary support under grants OCE-9711326, OCE-0137207, and OCE-0551940 (to ERMD).
Funders:
Funding AgencyGrant Number
NSF Chemical Oceanography ProgramOCE-9711326
NSF Chemical Oceanography ProgramOCE-0137207
NSF Chemical Oceanography ProgramOCE-0551940
Subject Keywords:reservoir age, radiocarbon, corals.
Record Number:CaltechAUTHORS:20120828-140427479
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120828-140427479
Official Citation:Druffel, E. R. M., L. F. Robinson, S. Griffin, R. B. Halley, J. R. Southon, and J. F. Adkins (2008), Low reservoir ages for the surface ocean from mid-Holocene Florida corals, Paleoceanography, 23, PA2209, doi:10.1029/2007PA001527.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:33618
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:28 Aug 2012 22:34
Last Modified:09 Mar 2020 13:19

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