noaa-ocean-12257
Florida Straits 20KYr Mg/Ca SST and d18Osw Reconstructions
Schmidt, M.W.; Lynch-Stieglitz, J.
Florida Straits 20KYr Mg/Ca SST and d18Osw Reconstructions
2011-10-18
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12257
Investigator
M.W.
Schmidt
Investigator
J.
Lynch-Stieglitz
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,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,null
earth science
paleoclimate
climate reconstructions|paleoceanography
delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil SMOW,null,climate reconstructions|paleoceanography,corrected,null,N,ice volume correction
earth science
paleoclimate
paleoceanography
barium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globigerinoides ruber,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globigerinoides ruber,null,millimole per mole,null,paleoceanography,null,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
earth science
paleoclimate
paleocean
reconstruction
geoscientificInformation
Meridional Overturning Circulation (MOC)
Other Hydroclimate Reconstruction
Sea Surface Temperature Reconstruction
Younger Dryas
19980 cal yr BP
640 cal yr BP
Complete
24.326833
24.326833
-83.252333
-83.252333
-546
-546
Ocean
Atlantic Ocean
North Atlantic Ocean
Gulf Of Mexico
KNR166-2-26JPC>LATITUDE 24.326833>LONGITUDE -83.252333
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
Schmidt, M.W. and J. Lynch-Stieglitz. 2011.
Florida Straits deglacial temperature and salinity change:
Implications for tropical hydrologic cycle variability
during the Younger Dryas.
Paleoceanography, 26, PA4205, doi:10.1029/2011PA002157.
The prevailing paradigm of abrupt climate change holds that
rapid shifts associated with the most extreme climate swings
of the last glacial cycle were forced by changes in the strength
and northward extension of Atlantic Meridional Overturning
Circulation (AMOC), resulting in an abrupt reorganization
of atmospheric circulation patterns with global teleconnections.
To determine the timing of tropical Atlantic atmospheric
circulation changes over the past 21 ka BP, we reconstruct
high resolution sea surface temperature and d18OSW (a proxy
for surface salinity) records based on Mg/Ca ratios and oxygen
isotope measurements in the planktonic foraminifera
Globigerinoides ruber from a sediment core located on the
western margin of the Florida Straits. As a proxy for meltwater
discharge influence on Florida Straits surface water salinity,
we also measured Ba/Ca ratios in G. ruber from the same core.
Results show that riverine influence on Florida Straits surface
water started by 17.2 ka BP and ended by 13.6 ka BP, 600 years
before the start of the Younger Dryas (YD) cold interval.
The initiation of the YD is marked by an abrupt increase
in Florida Straits d18OSW values, indicating a shift to
elevated sea surface salinity occurring in 130 years,
most likely resulting from increased regional aridity
and/or reduced precipitation. In order to resolve the timing
of tropical atmospheric circulation change relative to AMOC
variability across this transition, we compare the timing
of surface water changes to a recently published record
of Florida Current variability in the same core reconstructed
from benthic oxygen isotope measurements. We find synchronous
changes in atmospheric and ocean circulation on the transition
into the YD, consistent with an abrupt reduction in AMOC as
the driver of tropical Atlantic atmospheric circulation change
at this time.
STUDY NOTES: To determine the timing of tropical Atlantic atmospheric
circulation changes over the past 20 ka BP, we reconstruct
high resolution sea surface temperature and d18OSW (a proxy
for surface salinity) records based on Mg/Ca ratios and
oxygen isotope measurements in the planktonic foraminifera
Globigerinoides ruber from a sediment core located on the
western margin of the Florida Straits. As a proxy for meltwater
discharge influence on Florida Straits surface water salinity,
we also measured Ba/Ca ratios in G. ruber from the same core.
The age model for this core is based on calibrated radiocarbon
dates from G. ruber and G. sacculifer.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2011/schmidt2011.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2011/schmidt2011.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11