noaa-ocean-10250
North Atlantic IODP U1308 Middle Pleistocene Heinrich Events Data
Hodell, D.A.; Channell, J.E.T.; Curtis, J.H.; Romero, O.E.; Röhl, U.
North Atlantic IODP U1308 Middle Pleistocene Heinrich Events Data
2010-07-13
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10250
Investigator
D.A.
Hodell
Investigator
J.E.T.
Channell
Investigator
J.H.
Curtis
Investigator
O.E.
Romero
Investigator
U.
Röhl
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,composited,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
calcium/strontium,sediment,null,percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,carbonate,null,per mil VPDB,null,paleoceanography,null,null,N,bulk carbonate
earth science
paleoclimate
paleoceanography
gamma radiation,sediment,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnetic susceptibility,sediment,null,dimensionless,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
magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleoceanography,null,null,N,x10-3 units
earth science
paleoclimate
paleoceanography
density,sediment,null,gram per cubic centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
reflectance,sediment,null,dimensionless,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
silicon/strontium,sediment,null,percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth at sample end,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
physical properties
geoscientificInformation
Heinrich Events
1400000 cal yr BP
0 cal yr BP
Complete
49.8778
49.8778
-24.2383
-24.2383
-3883
-3883
Ocean
Atlantic Ocean
North Atlantic Ocean
U1308>LATITUDE 49.8778>LONGITUDE -24.2383
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., J.E.T. Channell, J.H. Curtis, O.E. Romero,
and U. Röhl. 2008.
Onset of "Hudson Strait" Heinrich events in the eastern North Atlantic
at the end of the middle Pleistocene transition (~640 ka)?
Paleoceanography, 23, PA4218, doi:10.1029/2008PA001591.
Heinrich events are well documented for the last glaciation,
but little is known about their occurrence in older glacial periods
of the Pleistocene. Here we report scanning XRF and bulk carbonate d18O
results from Integrated Ocean Drilling Program Site U1308 (reoccupation
of Deep Sea Drilling Project Site 609) that are used to develop proxy
records of ice-rafted detritus (IRD) for the last ~1.4 Ma. Ca/Sr is
used as an indicator of IRD layers that are rich in detrital carbonate
(i.e., Heinrich layers), whereas Si/Sr reflects layers that are poor
in biogenic carbonate and relatively rich in detrital silicate minerals.
A pronounced change occurred in the composition and frequency of IRD at
~640 ka during marine isotope stage (MIS) 16, coinciding with the end
of the middle Pleistocene transition. At this time, "Hudson Strait"
Heinrich layers suddenly appeared in the sedimentary record of Site U1308,
and the dominant period of the Si/Sr proxy shifted from 41 ka prior to
640 ka to 100 ka afterward. The onset of Heinrich layers during MIS 16
represents either the initiation of surging of the Laurentide Ice Sheet
(LIS) off Hudson Strait or the first time icebergs produced by this
process survived the transport to Site U1308. We speculate that ice
volume (i.e., thickness) and duration surpassed a critical threshold
during MIS 16 and activated the dynamical processes responsible for LIS
instability in the region of Hudson Strait. We also observe a strong
coupling between IRD proxies and benthic d13C variation at Site U1308
throughout the Pleistocene, supporting a link between iceberg discharge
and weakening of thermohaline circulation in the North Atlantic.
STUDY NOTES: Multiproxy Heinrich Events data from IODP core U1308 back to the
middle Pleistocene. Individual data series are as follows:
Tie points:
Modified splice tie points for composite section of Site U1308.
Depth-Age:
Age-depth points used to construct chronology for Site U1308
Radiocarbon dates are projected into Site U1308 from Site 609 [Bond et al., 1993]
by matching gray scale records. Ages for the interval from 0 to 1.9 mcd were
calculated assuming a constant sedimentation rate of 5.37 cm kyr-1 which is
generally consistent with radiocarbon dates from DSDP Site 609. From 35 to 60 ka,
the benthic d18O record was correlated to MD95Ð2042 using the SFCP04 time scale
[Shackleton et al., 2004. Prior to 60 ka, the benthic d18O record was correlated
to the stacked d18O record of Lisiecki and Raymo [2005].
Benthic isotopes:
Oxygen and carbon isotopes of the benthic foraminifer Cibicoides wuellerstorfi,
units = per mille relative to VPDB
Bulk carbonate O18:
Oxygen isotope values of homogenized bulk sediment, units = per mille relative to VPDB
Sr XRF:
Ca/Sr and Si/Sr ratios of counts from core scanning XRF measurements.
See Hodell et al. (2008) for measurement details and calibration.
Magnetic susceptibility:
Magnetic susceptibility measured on u-channels.
See Hodell et al. (2008) for methods.
Magnetic susceptibility, shipboard:
Shipboard magnetic susceptibility on the modified composite splice.
See Expedition 303 Scientists (2006a,b) for explanation of methods.
Bulk Density:
Shipboard bulk density on the modified composite splice.
See Expedition 303 Scientists (2006a,b) for explanation of methods.
NGR:
Shipboard natural gamma radiation on the modified composite splice.
See Expedition 303 Scientists (2006a,b) for explanation of methods.
Reflectance:
Shipboard color reflectance lightness on the modified composite splice.
See Expedition 303 Scientists (2006a,b) for explanation of methods.
Core location:
IODP Site U1308 49°52.67'N, 24°14.3'W, Water depth 3883 m
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2008/hodell2008.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2008/hodell2008.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11