noaa-ocean-5594
ODP1060 MIS 3 Western Boundary Undercurrent Flow Vigour Data
Hoogakker, B.A.A.; McCave, I.N.
ODP1060 MIS 3 Western Boundary Undercurrent Flow Vigour Data
2007-07-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5594
Investigator
B.A.A.
Hoogakker
Investigator
I.N.
McCave
earth science
paleoclimate
paleoceanography
total planktic foraminifers,null,null,percent,null,paleoceanography,null,null,N,cold-water species
earth science
paleoclimate
paleoceanography
delta 18O,Uvigerina peregrina,null,per mil PDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
mineral matter,sediment,null,count per gram,null,paleoceanography,null,null,N,>150 microns
earth science
paleoclimate
paleoceanography
cadmium/calcium,Uvigerina peregrina,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
grain size median,null,null,micrometer,null,paleoceanography,null,null,N,silt fraction
earth science
paleoclimate
paleoceanography
age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
total planktic foraminifers,null,null,percent,null,paleoceanography,null,null,N,warm-water species
earth science
paleoclimate
paleoceanography
delta 13C,Uvigerina peregrina,null,per mil PDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
mineral matter,sediment,null,count per gram,null,paleoceanography,null,null,N,90 to 150 microns
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
trace metals in carbonates
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
lithology
earth science
paleoclimate
paleocean
carbon isotopes
earth science
paleoclimate
paleocean
population abundance
earth science
paleoclimate
paleocean
age control
geoscientificInformation
62987 14C yr BP
23260 14C yr BP
62987 cal yr BP
27912 cal yr BP
Complete
30.766667
30.766667
-74.466667
-74.466667
-3481
-3481
Ocean
Atlantic Ocean
North Atlantic Ocean
ODP1060>LATITUDE 30.766667>LONGITUDE -74.466667
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
Hoogakker, B.A.A., I.N. McCave, and M.J. Vautravers. 2007. Antarctic link to deep flow speed variation during Marine Isotope Stage 3 in the western North Atlantic. Earth and Planetary Science Letters 257, 463ŋ473.
The Western Boundary Undercurrent (WBUC), off eastern America, is an important component of the Atlantic Meridional Overturning circulation and is the principal route for southward transport of North Atlantic waters and southward return of Southern Source Water (SSW). Here a direct flow speed proxy (mean grain size of the sortable silt) is used to infer the vigour of flow of the palaeo-WBUC at Blake Outer Ridge, (ODP Site 1060, depth 3481 m) during Marine Isotope Stage (MIS) 3. The overall shape of the flow speed proxy record shows a complex pattern of variability, with generally more vigorous flow and larger-scale flow variations between 35 and 60 ka than in the younger part of MIS 3 and MIS 2 (< 35 ka). Six events of reduced bottom flow vigour (Slow Events, SEs) occur. These appear uncorrelated with Heinrich events, but are instead synchronous with the warming phases of Antarctic Warm Events A-1 to A-4 (with one new one, A-1a and one poorly defined, `A-0ŋ). This indicates that Antarctic climate exerts a stronger control on deep flow vigour in the North Atlantic during MIS 3 than Northern Hemisphere climate. The correspondence of SEs with Antarctic warming suggests a weaker WBUC flow due to reduced volume flux at SSW source or reduced SSW density. Because the variability of the lower limb of the WBUC was not connected to sharp North Atlantic changes in temperature, it is unlikely that the Dansgaard/Oeschger cycles were associated with a mode of MOC variation involving whole-ocean overturn, but more likely with perturbations of only the shallow Glacial Gulf StreamŋGlacial Northern Source Intermediate Water cell. Nutrient proxies (benthic carbon isotopes and Cd/Ca of Uvigerina peregrina) at this site show similar trends to the GRIP d18O record. This correlation has previously been attributed mainly to hydrographic and flow changes but is here shown to be better explained by variations in surface ocean productivity and subsequent decomposition of 12C rich organic material on the sea floor.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp1060-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoogakker2007
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11