North Atlantic Core GGC5 231Pa/230Th Meridional Circulation Data McManus, J.F.; Francois, R.; Gherardi, J.-M.; Keigwin, L.D.; Brown-Leger, S. McManus, J.F. Francois, R. Gherardi, J.-M. Keigwin, L.D. Brown-Leger, S. earth science/paleoclimate/paleoceanography (231Pa/230Th excess,sediment,two standard deviations upper bound,dimensionless,null,paleoceanography,null,null,N,excess calculation based on measured 232U values) earth science/paleoclimate/paleoceanography (age,null,null,calendar year before present,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (231Pa/230Th excess,sediment,null,dimensionless,null,paleoceanography,null,null,N,excess calculation based on measured 232U values) earth science/paleoclimate/paleoceanography (231Pa/230Th excess,sediment,null,dimensionless,null,paleoceanography,null,null,N,excess calculation based on measured 238U values) earth science/paleoclimate/paleoceanography (231Pa/230Th excess,sediment,unspecified margin of error,dimensionless,null,paleoceanography,null,null,N,excess calculation based on measured 238U values) earth science/paleoclimate/paleoceanography (delta 18O,Globorotalia inflata,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (OCE326-GGC5>LATITUDE 33.7>LONGITUDE -57.58) The Atlantic meridional overturning circulation is widely believed to affect climate. Changes in ocean circulation have been inferred from records of the deep water chemical composition derived from sedimentary nutrient proxies, but their impact on climate is difficult to assess because such reconstructions provide insufficient constraints on the rate of overturning. Here we report measurements of 231Pa/230Th, a kinematic proxy for the meridional overturning circulation, in a sediment core from the subtropical North Atlantic Ocean. We find 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. Following these cold events, the 231Pa/230Th record indicates that rapid accelerations of the meridional overturning circulation were concurrent with the two strongest regional warming events during deglaciation. These results confirm the significance of variations in the rate of the Atlantic meridional overturning circulation for abrupt climate changes. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : McManus, J.F. Investigator : Francois, R. Investigator : Gherardi, J.-M. Investigator : Keigwin, L.D. Investigator : Brown-Leger, S. 2004-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/6406 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o326-gc5-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcmanus2004 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o326-gc5-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcmanus2004 English https://www.ncdc.noaa.gov/paleo/study/6406 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o326-gc5-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcmanus2004 McManus, J.F., R. Francois, J.-M. Gherardi, L.D. Keigwin, and S. Brown-Leger. 2004. Collapse and rapid resumption of Atlantic meridional circulationlinked to deglacial climate changes. Nature, 428, 834-837. START YEAR: 20020 cal yr BP * END YEAR: 100 cal yr BP -57.58 33.7 -57.58 33.7