noaa-ocean-9094
Northeast Atlantic SU81-18 Deglacial 231Pa/230Th Data
Gherardi, J.-M.; Labeyrie, L.D.; McManus, J.F.; Francois, R.
Northeast Atlantic SU81-18 Deglacial 231Pa/230Th Data
2005-07-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9094
Investigator
J.-M.
Gherardi
Investigator
L.D.
Labeyrie
Investigator
J.F.
McManus
Investigator
R.
Francois
earth science
paleoclimate
paleoceanography
delta 18O,Globigerina bulloides,null,per mil PDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
230Th,sediment,null,gram per square centimeter per kiloyear,null,paleoceanography,null,null,N,248th mass flux
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,null
earth science
paleoclimate
paleoceanography
230Th,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
231Pa,sediment,null,disintegration per minute per gram,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
231Pa/230Th excess,sediment,two standard deviations,dimensionless,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
17991 14C yr BP
430 14C yr BP
21285 cal yr BP
449 cal yr BP
Complete
37.77
37.77
-10.18
-10.18
-3135
-3135
Ocean
Atlantic Ocean
North Atlantic Ocean
SU81-18>LATITUDE 37.77>LONGITUDE -10.18
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
Gherardi, J.-M., L. Labeyrie, J.F. McManus, R. Francois, L.C. Skinner, and E. Cortijo. 2005. Evidence from the Northeastern Atlantic basin for variability in the rate of the meridional overturning circulation through the last deglaciation. Earth and Planetary Science Letters, 240(3-4), 710-723.
A first study from the subtropical western Atlantic, using 231Pa/230Th ratios as a kinematic proxy for deep water circulation, provided compelling evidence for a strong link between climate and the rate of Meridional Overturning Circulation (MOC) over the last deglaciation. However, these results warrant confirmation from additional locations and water depths because the interpretation of the sedimentary 231Pa/230Th ratio in terms of circulation vigor can be biased by variations in particle flux and composition. We have measured 231Pa/230Th in a core from the Iberian margin, in the Northeastern Atlantic basin, and have compared these new results to the data from the western Atlantic basin. We find that the reduction in the circulation during H1 and YD and the subsequent increases first recognized in the sediment deposited on Bermuda Rise are also evident in the eastern basin, in a totally different sedimentary regime, confirming that sedimentary 231Pa/230Th ratios record basin-wide changes in deep water circulation. However, some differences between the eastern and western records are also recognized, providing preliminary evidence to differentiate between renewal rates in the two North Atlantic basins and between shallower and deeper overturning. Our results suggest the possible existence of two sources of Glacial North Atlantic Intermediate Deep Water (GNAIW), one in the south Labrador Sea and another west of Rockall Plateau. Both sources contributed to the meridional overturning but the two had different sensitivity to meltwater from the Laurentide and the Fennoscandian ice sheets during the deglaciation. These results indicate that additional information on the geometry and strength of the ventilation of the deep Atlantic can be obtained by contrasting the evolution of sediment 231Pa/230Th in different sections of the Atlantic Ocean.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gherardi2005
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/syntrace/t21data/s81-18-g-sytr-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/s81-18-g-tab.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11