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Dynamic intermediate waters across the late glacial revealed by paired radiocarbon and clumped isotope temperature records

Hines, Sophia K. V. and Eiler, John M. and Southon, John R. and Adkins, Jess F. (2019) Dynamic intermediate waters across the late glacial revealed by paired radiocarbon and clumped isotope temperature records. Paleoceanography and Paleoclimatology, 34 (7). pp. 1074-1091. ISSN 2572-4517. https://resolver.caltech.edu/CaltechAUTHORS:20190530-102320622

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Abstract

Paired radiocarbon and clumped isotope temperature records from U/Th‐dated Desmophyllum dianthus corals in the North Atlantic and Southern Ocean provide unique information about the history of intermediate waters (∼1,500–1,700 m) across the late glacial and deglaciation (∼35–10 ka). These measurements allow for the construction of radiocarbon‐temperature crossplots, which help to identify water mass endmembers at different times across the deglaciation. Radiocarbon and temperature values from the late glacial fall outside the range of modern ocean data from near the sample collection sites. In the North Atlantic, radiocarbon values tend to be much older than the modern, while in the Southern Ocean, they are more often younger than the modern. Reconstructed temperatures vary around respective modern ocean values; however, warm waters are observed at the Last Glacial Maximum and across the deglaciation in the north and south. We interpret our data in the context of the modern hydrography of the Western North Atlantic and Southern Ocean, and we draw upon direct comparisons between sediment core‐derived reconstructions of ocean circulation from the South Indo‐Pacific and our deep‐sea coral data from the Southern Ocean. Our North Atlantic data support accepted patterns of reduced North Atlantic Deep Water formation during Heinrich Stadials 1 and 2. In the Southern Ocean, deep‐sea coral populations respond to changes in ocean structure that are also reflected in a depth profile of δ^(13)C data from New Zealand, and data indicate that there was less influence of Pacific Deep Water between 1,500 and 1,700 m south of Tasmania across much of the deglaciation.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2019pa003568DOIArticle
ORCID:
AuthorORCID
Hines, Sophia K. V.0000-0001-9357-6399
Southon, John R.0000-0001-6168-6235
Adkins, Jess F.0000-0002-3174-5190
Additional Information:© 2019 American Geophysical Union. Received 18 JAN 2019; Accepted 24 MAY 2019; Accepted article online 29MAY 2019; Published online 10 JUL 2019. We would like to thank Andrew Thompson, Nivedita Thiagarajan, and Julia Gottschalk for helpful discussions. We also acknowledge constructive comments from two anonymous reviewers. S. K. V. H. received support from NSF Grants OCE‐1503129 and OCE‐1204211 and the Lamont‐Doherty Earth Observatory Postdoctoral Fellowship. All data are available in the supplemental tables and will be archived on the NOAA National Centers for Environmental Information.
Funders:
Funding AgencyGrant Number
NSFOCE-1503129
NSFOCE-1204211
Lamont-Doherty Earth ObservatoryUNSPECIFIED
Subject Keywords:Radiocarbon; Clumped Isotope Temperature; Ocean Circulation; Intermediate Water
Issue or Number:7
Record Number:CaltechAUTHORS:20190530-102320622
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190530-102320622
Official Citation:Hines, S. K. V., Eiler, J. M., Southon, J. R., & Adkins, J. F. (2019). Dynamic intermediate waters across the late glacial revealed by paired radiocarbon and clumped isotope temperature records. Paleoceanography and Paleoclimatology, 34, 1074–1091 https://doi.org/10.1029/2019PA003568
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95957
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:30 May 2019 17:43
Last Modified:25 Feb 2020 10:47

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