noaa-ocean-10519
Gardar Drift Last Interglacial Foraminiferal Stable Isotope Data
Hodell, D.A.; Minth, E.K.; Curtis, J.H.; McCave, I.N.; Hall, I.R.; Channell, J.E.T.; Xuan, C.
Gardar Drift Last Interglacial Foraminiferal Stable Isotope Data
2011-03-05
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10519
Investigator
D.A.
Hodell
Investigator
E.K.
Minth
Investigator
J.H.
Curtis
Investigator
I.N.
McCave
Investigator
I.R.
Hall
Investigator
J.E.T.
Channell
Investigator
C.
Xuan
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,composited,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Neogloboquadrina incompta,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globigerina bulloides,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
carbonate,sediment,null,percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth at sample start,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 13C,Globorotalia inflata,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,core ID
earth science
paleoclimate
paleoceanography
delta 18O,Globorotalia inflata,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 13C,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 13C,Neogloboquadrina incompta,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
lightness,sediment,null,dimensionless,null,paleoceanography,null,spectrophotometry,N,null
earth science
paleoclimate
paleoceanography
depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,null,null,N,mbsf
earth science
paleoclimate
paleoceanography
delta 13C,Globigerina bulloides,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
carbon isotopes
geoscientificInformation
Meridional Overturning Circulation (MOC)
161600 cal yr BP
104720 cal yr BP
Complete
53.0567
53.0567
-33.5297
-33.5297
-3065
-3065
Ocean
Atlantic Ocean
North Atlantic Ocean
U1304>LATITUDE 53.0567>LONGITUDE -33.5297
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
Hodell, D.A., E.K. Minth, J.H. Curtis, I.N. McCave, I.R. Hall,
J.E.T. Channell, and C. Xuan. 2009.
Surface and deep-water hydrography on Gardar Drift (Iceland Basin)
during the last interglacial period.
Earth and Planetary Science Letters, Vol. 288, pp. 10-19.
doi:10.1016/j.epsl.2009.08.040
Changes in surface and deep-water hydrography were inferred from
variations in stable isotopes and sortable silt mean grain size,
respectively, on the southern Gardar Drift in the subpolar North
Atlantic. The bathymetric d13C gradient during the penultimate
glaciation was similar to the last glaciation with high-d13C
Glacial North Atlantic Intermediate water above ~2000 m,
and low-d13C water derived from the Southern Ocean below.
During Termination II, low-d13C water was present throughout
the water column with minimum values at intermediate depths
(~1500-2000 m) and below 3000 m. This pattern continued well
into the early part of the Last Interglacial (LIG) period.
Sortable silt mean size at 3275 m suggests that deep-water
circulation on Gardar Drift was relatively weak during the
earliest part of the LIG (128 to 124.5 ka) when planktonic d18O
was at a minimum, reflecting warming and/or reduced salinity.
We suggest that low-d13C water and slow current speed on Gardar
Drift during the early part of the LIG was related to increased
melt water fluxes to the Nordic Seas during peak boreal summer
insolation, which decreased the flux and/or density of overflow
to the North Atlantic. The resumption of the typical interglacial
pattern of strong, well-ventilated Iceland Scotland Overflow Water
was delayed until ~124 ka. These changes may have affected
Atlantic Meridional Overturning Circulation.
STUDY NOTES: High-resolution (centennial scale) planktonic and benthic
foraminiferal stable isotope data, plus carbonate content
and sediment color intensity data from the Gardar Drift,
Iceland Basin, over the last interglacial.
Site U1304 was sampled at a constant 5-cm spacing between
24.52 and 15.47 mcd, corresponding to the MIS 6 through
MIS 5d interval. The mean sedimentation rate for MIS 5e
and 5d is 40 cm/ka, which results in an average sampling
frequency of 125 years.
Stable oxygen (d18O) and carbon (d13C) isotope ratios
were measured on three species of planktonic foraminifera
(Globigerina bulloides, Neogloboquadrina incompta,
and Globorotalia inflata) and the epi-benthic foraminfera
Cibicidoides wuellerstorfi. Sediment lightness was measured
at 2-cm intervals shortly after cores were split, using a
Minolta CM1500 Spectrophotometer.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2009/hodell2009.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2009/hodell2009.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11