noaa-ocean-6406
North Atlantic Core GGC5 231Pa/230Th Meridional Circulation Data
McManus, J.F.; Francois, R.; Gherardi, J.-M.; Keigwin, L.D.; Brown-Leger, S.
North Atlantic Core GGC5 231Pa/230Th Meridional Circulation Data
2004-07-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/6406
Investigator
J.F.
McManus
Investigator
R.
Francois
Investigator
J.-M.
Gherardi
Investigator
L.D.
Keigwin
Investigator
S.
Brown-Leger
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
oxygen isotopes
earth science
paleoclimate
paleocean
radiogenic isotope
earth science
paleoclimate
paleocean
age control
geoscientificInformation
20020 cal yr BP
100 cal yr BP
Complete
33.7
33.7
-57.58
-57.58
-4550
-4550
Ocean
Atlantic Ocean
North Atlantic Ocean
OCE326-GGC5>LATITUDE 33.7>LONGITUDE -57.58
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
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.
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.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/o326-gc5-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcmanus2004
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11