noaa-ocean-11196
Atlantic Deglacial Mg/Ca SST and d18Osw Reconstructions
Carlson, A.E.; Oppo, D.W.; Came, R.E.; LeGrande, A.N.; Keigwin, L.D.; Curry, W.B.
Atlantic Deglacial Mg/Ca SST and d18Osw Reconstructions
2011-05-18
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/11196
Investigator
A.E.
Carlson
Investigator
D.W.
Oppo
Investigator
R.E.
Came
Investigator
A.N.
LeGrande
Investigator
L.D.
Keigwin
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
magnesium/calcium,Globigerinoides ruber white,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,null,null,N,G. ruber white
earth science
paleoclimate
paleoceanography
delta 18O,calcite,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,G. ruber white
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,Globorotalia inflata
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globorotalia inflata,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
reconstruction
geoscientificInformation
Meridional Overturning Circulation (MOC)
Sea Surface Temperature Reconstruction
25120 cal yr BP
370 cal yr BP
Complete
-27.52
33.7
-76.2833
-46.47
-4550
-1268
Ocean
Atlantic Ocean
South Atlantic Ocean
KNR159-36>LATITUDE -27.52>LONGITUDE -46.47
Ocean
Atlantic Ocean
North Atlantic Ocean
OCE326-GGC5>LATITUDE 33.7>LONGITUDE -57.58
Ocean
Atlantic Ocean
North Atlantic Ocean
KNR140-51GGC>LATITUDE 32.7833>LONGITUDE -76.2833
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
Carlson, A.E., D.W. Oppo, R.E. Came, A.N. LeGrande, L.D. Keigwin,
and W.B. Curry. 2008.
Subtropical Atlantic salinity variability and Atlantic meridional
circulation during the last deglaciation.
Geology, Vol. 36, pp. 991-994.
During the last deglaciation (ca. 21-10 ka), freshening of the
North Atlantic surface likely caused reductions in Atlantic
meridional overturning circulation (AMOC); the mechanisms related
to AMOC recovery remain poorly understood. Here we present three
new deglacial surface temperature and d18Oseawater (d18Osw)
reconstructions from the western subtropical North and South
Atlantic. Similarities to tropical Caribbean and western Atlantic
d18Osw records suggest that a salty surface water mass accumulated
in the western Atlantic from 27°S to 33°N during periods of
reduced AMOC. However, d18Osw decreases led deep AMOC resumption
by hundreds of years. We suggest that the northward export of salt
previously trapped in the western Atlantic resulted in the early
establishment of a shallow overturning circulation that eventually
culminated in deep AMOC resumption, implying that AMOC may
constitute a self-limiting system.
STUDY NOTES: Reconstructed foraminiferal calcification temperature and d18Oseawater
from three western subtropical North and South Atlantic sediment cores.
Core OCE326-GGC5 is located on the Bermuda Rise, KNR140–51GGC on
the Blake Outer Ridge, and KNR159–5–36GGC along the Brazilian margin.
For the Blake Outer Ridge and the Brazilian margin cores, d18Ocalcite
and Mg/Ca of the planktonic foraminifera Globigerinoides ruber (white)
were measured. Mg/Ca was converted to calcification temperature (CT)
for these two cores using a species-specific (G. ruber) core top
calibration for the Atlantic basin (Dekens et al., 2002):
Mg/Ca (mmol/mol) = 0.38*exp(0.09*CT)
For Bermuda Rise core GGC5, d18Ocalcite and Mg/Ca of the planktonic
foraminifera Globorotalia inflata were measured. A new Mg/Ca-CT
calibration, following Anand et al. (2003) and Dekens et al. (2002),
was developed for this core:
Mg/Ca (mmol/mol) = 0.299*exp[0.09*(CT-0.61*D)]
where D is the core water depth in km.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/carlson2008/carlson2008.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/carlson2008/carlson2008.xls
USA/NOAA
DIF
Version 9.8.4
2019-06-06
2019-06-06