L
Lloyd D Keigwin
Researcher at Woods Hole Oceanographic Institution
Publications - 167
Citations - 18698
Lloyd D Keigwin is an academic researcher from Woods Hole Oceanographic Institution. The author has contributed to research in topics: Glacial period & Foraminifera. The author has an hindex of 73, co-authored 163 publications receiving 17519 citations. Previous affiliations of Lloyd D Keigwin include University of Rhode Island & Brown University.
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Journal ArticleDOI
Collapse and rapid resumption of Atlantic meridional circulation linked to deglacial climate changes
TL;DR: It is found that the meridional overturning was nearly, or completely, eliminated during the coldest deglacial interval in the North Atlantic region, beginning with the catastrophic iceberg discharge Heinrich event H1, 17,500’yr ago, and declined sharply but briefly into the Younger Dryas cold event, about 12,700 yr ago.
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North Atlantic thermohaline circulation during the past 20,000 years linked to high-latitude surface temperature
Edward A. Boyle,Lloyd D Keigwin +1 more
TL;DR: In this paper, the authors show that during a surface cooling event 10,000 to 12,000 years ago, higher Cd/Ca and lower 13C/12C ratios are observed in benthic foraminifera shells from rapidly accumulating western North Atlantic sediments.
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Comparison of Atlantic and Pacific paleochemical records for the last 215,000 years : changes in deep ocean circulation and chemical inventories
Edward A. Boyle,Lloyd D Keigwin +1 more
TL;DR: In this article, detailed Cd/Ca and δ 13 C data have been obtained for benthic foraminifera from western North Atlantic and Equatorial Pacific sediment cores, which indicate that bottom waters overlying the Atlantic site have been nutrient depleted relative to those at the Pacific site over the last 215,000 years.
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Formation of the Isthmus of Panama
Aaron O'Dea,Harilaos A. Lessios,Anthony G. Coates,Ron I. Eytan,Sergio A. Restrepo-Moreno,Sergio A. Restrepo-Moreno,Alberto Luis Cione,Laurel S. Collins,Laurel S. Collins,Alan de Queiroz,David W. Farris,Richard D Norris,Robert F. Stallard,Robert F. Stallard,Michael O. Woodburne,Orangel Aguilera,Marie-Pierre Aubry,William A. Berggren,Ann F. Budd,Mario Alberto Cozzuol,Simon E. Coppard,Herman Duque-Caro,Seth Finnegan,Germán Mariano Gasparini,Ethan L. Grossman,Kenneth G. Johnson,Lloyd D Keigwin,Nancy Knowlton,Egbert Giles Leigh,Jill S. Leonard-Pingel,Peter B. Marko,Nicholas D. Pyenson,P.G. Rachello-Dolmen,P.G. Rachello-Dolmen,Esteban Soibelzon,Leopoldo Héctor Soibelzon,Jonathan A. Todd,Geerat J. Vermeij,Jeremy B. C. Jackson,Jeremy B. C. Jackson,Jeremy B. C. Jackson +40 more
TL;DR: An exhaustive review and reanalysis of geological, paleontological, and molecular records converge upon a cohesive narrative of gradually emerging land and constricting seaways, with formation of the Isthmus of Panama sensu stricto around 2.8 Ma.
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Sudden changes in North Atlantic circulation during the last deglaciation
Scott J. Lehman,Lloyd D Keigwin +1 more
TL;DR: Sudden changes in the flow of warm Atlantic surface waters into the Norwegian Sea occurred frequently during the last deglaciation, typically involving shifts in sea surface temperature of ⩾5 °C in fewer than 40 years as discussed by the authors.