noaa-ocean-10251
Atlantic and Pacific Regional 450 KYr Benthic d13C Stacks
Lisiecki, L.E.; Raymo, M.E.; Curry, W.B.
Atlantic and Pacific Regional 450 KYr Benthic d13C Stacks
2010-07-23
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10251
Investigator
L.E.
Lisiecki
Investigator
M.E.
Raymo
Investigator
W.B.
Curry
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 13C,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,composited,null,N,deep Atlantic sites
earth science
paleoclimate
paleoceanography
delta 13C,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,composited,null,N,shallow Atlantic sites
earth science
paleoclimate
paleoceanography
delta 13C,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,composited,null,N,deep Pacific sites
earth science
paleoclimate
paleoceanography
delta 13C,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,composited,null,N,mid-depth Atlantic sites
earth science
paleoclimate
paleoceanography
delta 13C,Cibicidoides wuellerstorfi,null,per mil VPDB,null,paleoceanography,composited,null,N,mid-depth Atlantic stack minus deep Pacific stack
earth science
paleoclimate
paleocean
carbon isotopes
geoscientificInformation
Meridional Overturning Circulation (MOC)
450000 cal yr BP
0 cal yr BP
Complete
4.20415
4.20415
-43.4889
-43.4889
-3042
-3042
Ocean
Atlantic Ocean
North Atlantic Ocean
ODP 925>LATITUDE 4.20415>LONGITUDE -43.4889
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
Lisiecki, L.E., M.E. Raymo, and W.B. Curry. 2008.
Atlantic overturning responses to Late Pleistocene climate forcings.
Nature, Vol. 456, pp. 85-88, 6 November 2008.
doi:10.1038/nature07425
The factors driving glacial changes in ocean overturning circulation
are not well understood. On the basis of a comparison of 20 climate
variables over the past four glacial cycles, the SPECMAP project
proposed that summer insolation at high northern latitudes (that is,
Milankovitch forcing) drives the same sequence of ocean circulation
and other climate responses over 100-kyr eccentricity cycles,
41-kyr obliquity cycles and 23-kyr precession cycles.
SPECMAP analysed the circulation response at only a few sites in
the Atlantic Ocean, however, and the phase of circulation response
has been shown to vary by site and orbital band. Here we test the
SPECMAP hypothesis by measuring the phase of orbital responses in
benthic d13C (a proxy indicator of ocean nutrient content) at 24
sites throughout the Atlantic over the past 425 kyr. On the basis
of d13C responses at 3,000-4,010m water depth, we find that maxima
in Milankovitch forcing are associated with greater mid-depth
overturning in the obliquity band but less overturning in the
precession band. This suggests that Atlantic overturning is strongly
sensitive to factors beyond ice volume and summer insolation at
high northern latitudes. A better understanding of these processes
could lead to improvements in model estimates of overturning rates,
which range from a 40 per cent increase to a 40 per cent decrease
at the Last Glacial Maximum and a 10-50 per cent decrease over the
next 140 yr in response to projected increases in atmospheric CO2.
STUDY NOTES: The d13C records used in this study are collected from previous studies
and primarily measured from the epibenthic taxon Cibicidoides wuellerstorfi.
All records are placed on a common age model by aligning their benthic d18O
records to the LR04 benthic d18O stack (Lisiecki and Raymo, 2005).
The posted data include regional stacks (averages) of benthic d13C (%VPDB)
from shallow North Atlantic sites (DSDP552, ODP980, ODP982, ODP983),
mid-depth Atlantic sites (ODP925, ODP927, ODP928, GeoB1214), deep Atlantic
sites (DP929, ODP1089, GeoB1041, GeoB1211), and deep Pacific sites (ODP677,
ODP846, ODP849, RC13-110, V21-146). A proxy for mid-depth NADW (Dd13C_mid)
is found by subtracting the deep Pacific d13c stack from the mid-depth
Atlantic d13c stack.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lisiecki2008/lisiecki2008.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/lisiecki2008/lisiecki2008.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11