noaa-ocean-12215
Western Atlantic Deglacial Paired Benthic Mg/Ca and d18O Data
Came, R.E.; Curry, W.B.; Oppo, D.W.; Broccoli, A.J.; Stouffer, R.J.; Lynch-Stieglitz, J.
Western Atlantic Deglacial Paired Benthic Mg/Ca and d18O Data
2011-10-11
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12215
Investigator
R.E.
Came
Investigator
W.B.
Curry
Investigator
D.W.
Oppo
Investigator
A.J.
Broccoli
Investigator
R.J.
Stouffer
Investigator
J.
Lynch-Stieglitz
earth science
paleoclimate
paleoceanography
magnesium/calcium,benthic foraminifer,null,millimole per mole,null,paleoceanography,averaged,null,N,Hoeglundina elegans
earth science
paleoclimate
paleoceanography
age,null,null,calendar year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Cibicidoides sp.,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,benthic foraminifer,null,millimole per mole,null,paleoceanography,null,null,N,Hoeglundina elegans
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,Cibicidoides sp. species sampled
earth science
paleoclimate
paleoceanography
delta 18O,Cibicidoides sp.,null,per mil,null,paleoceanography,averaged,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
oxygen isotopes
geoscientificInformation
Meridional Overturning Circulation (MOC)
27784 cal yr BP
613 cal yr BP
Complete
24.216667
26.066667
-83.3
-78.033333
-1057
-751
Ocean
Atlantic Ocean
North Atlantic Ocean
OCE205-2-100GGC>LATITUDE 26.066667>LONGITUDE -78.033333
Ocean
Atlantic Ocean
North Atlantic Ocean
KNR166-2-31JPC>LATITUDE 24.216667>LONGITUDE -83.3
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
Came, R.E., W.B. Curry, D.W. Oppo, A.J. Broccoli, R.J. Stouffer,
and J. Lynch-Stieglitz. 2007.
North Atlantic Intermediate Depth Variability During the Younger
Dryas: Evidence From Benthic Foraminiferal Mg/Ca and the GFDL
R30 Coupled Climate Model.
in Past and Future Changes of the Ocean's Meridional Overturning
Circulation: Mechanisms and Impacts, Geophysical Monograph Series,
edited by A. Schmittner, J. Chiang, and S. Hemming,
American Geophysical Union, Washington, D.C, pp. 247-263,
doi:10.1029/173GM16.
Two new records of paired benthic foraminiferal Mg/Ca and d18O
from two low latitude western Atlantic sediment cores - one taken
from within the Florida Current and the other from the Little
Bahama Bank - provide insights into the spatial distribution
of intermediate depth temperature and salinity variability
during the deglaciation. During the Younger Dryas cold event,
both temperature and salinity increased at the Florida Current
site and decreased at the Little Bahama Bank site. The temperature
increase within the Florida Current is consistent with a reduction
in the strength of the northward-moving surface return flow of the
Atlantic meridional overturning circulation; the temperature
decrease at the Little Bahama Bank is consistent with a cooling
of high latitude North Atlantic surface waters. To test
the possibility that a freshening of the surface North Atlantic
caused the paleoceanographic changes during the Younger Dryas,
the Geophysical Fluid Dynamics Laboratory (GFDL) R30 coupled
ocean-atmosphere general circulation model was forced using
a North Atlantic freshwater perturbation of 0.1 Sv for a period
of 100 years. The freshwater flux causes an overall reduction
in the Atlantic overturning from 25 Sv to 13 Sv. However,
at ~1,100 m water depth, ventilation increases, causing decreases
in both temperature and salinity throughout much of the
intermediate depth, open-ocean North Atlantic. At the western
boundary, intermediate depth temperatures and salinities increase
due to weakened overturning, and also due to an increase in runoff
from the Amazon River, which causes a surface stability and a
decrease in the upwelling of colder, deeper waters.
STUDY NOTES: Benthic foraminiferal Mg/Ca and d18O data from two sediment cores
collected in the Florida Current and the Little Bahama Bank covering
the last deglacial interval.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/came2007b/came2007b.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/came2007b/came2007b.xls
USA/NOAA
DIF
Version 9.8.4
2019-06-06
2019-06-06