noaa-ocean-13609
Bonaire Basin VM12-107 22000 Year d18O and Mg/Ca Data
Schmidt, M.W.; Chang, P.; Hertzberg, J.E.; Them, T.R. II; Ji, L.; Otto-Bliesner, B.L.
Bonaire Basin VM12-107 22000 Year d18O and Mg/Ca Data
2012-12-12
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13609
Investigator
M.W.
Schmidt
Investigator
P.
Chang
Investigator
J.E.
Hertzberg
Investigator
T.R. II
Them
Investigator
L.
Ji
Investigator
B.L.
Otto-Bliesner
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globorotalia crassaformis,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
number of samples,null,null,count,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globigerinoides ruber white,null,per mil VPDB,null,paleoceanography,null,null,N,250-355 micron
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globigerinoides ruber white,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globorotalia crassaformis,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globorotalia crassaformis,one standard deviation,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globigerinoides ruber white,one standard deviation,millimole per mole,null,paleoceanography,null,null,N,250-355 micron
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)
22000 cal yr BP
0 cal yr BP
Complete
11.33
11.33
-66.63
-66.63
-1079
-1079
Ocean
Atlantic Ocean
North Atlantic Ocean
Caribbean Sea
VM12-107>LATITUDE 11.33>LONGITUDE -66.63
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
Matthew W. Schmidt, Ping Chang, Jennifer E. Hertzberg, Theodore R. Them II, Link Ji, and Bette L. Otto-Bliesner. 2012. Impact of abrupt deglacial climate change on tropical Atlantic subsurface temperatures. Proceedings of the National Academy of Sciences, Vol. 109, No. 36, pp. 14348 - 14352, 4-September-2012. DOI: 10.1073/pnas.1207806109
Both instrumental data analyses and coupled ocean-atmosphere models indicate that Atlantic meridional overturning circulation (AMOC) variability is tightly linked to abrupt tropical North Atlantic (TNA) climate change through both atmospheric and oceanic processes. Although a slowdown of AMOC results in an atmospheric-induced surface cooling in the entire TNA, the subsurface experiences an even larger warming because of rapid reorganizations of ocean circulation patterns at intermediate water depths. Here, we reconstruct high-resolution temperature records using oxygen isotope values and Mg/Ca ratios in both surface- and subthermocline-dwelling planktonic foraminifera from a sediment core located in the TNA over the last 22 ky. Our results show significant changes in the vertical thermal gradient of the upper water column, with the warmest subsurface temperatures of the last deglacial transition corresponding to the onset of the Younger Dryas. Furthermore, we present new analyses of a climate model simulation forced with freshwater discharge into the North Atlantic under Last Glacial Maximum forcings and boundary conditions that reveal a maximum subsurface warming in the vicinity of the core site and a vertical thermal gradient change at the onset of AMOC weakening, consistent with the reconstructed record. Together, our proxy reconstructions and modeling results provide convincing evidence for a subsurface oceanic teleconnection linking high-latitude North Atlantic climate to the tropical Atlantic during periods of reduced AMOC across the last deglacial transition.
STUDY NOTES: High-resolution oxygen isotope data and Mg/Ca ratios in both surface- and subthermocline-dwelling planktonic foraminifera (G. ruber and G. crassaformis) from a sediment core located in the Bonaire Basin, southern Caribbean Sea, for the last 22 kyr.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2012b/schmidt2012b-ruber.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/schmidt2012b/schmidt2012b-crass.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11