noaa-ocean-9627
Portuguese Margin MIS6 foraminiferal isotope and palynology data
Margari, V.; Skinner, L.C.; Tzedakis, P.C.; Ganopolski, A.; Vautravers, M.J.; Shackleton, N.J.
Portuguese Margin MIS6 foraminiferal isotope and palynology data
2010-09-10
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/9627
Investigator
V.
Margari
Investigator
L.C.
Skinner
Investigator
P.C.
Tzedakis
Investigator
A.
Ganopolski
Investigator
M.J.
Vautravers
Investigator
N.J.
Shackleton
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,benthic foraminifer,null,per mil,null,paleoceanography,averaged,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globigerina bulloides,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
population abundance
earth science
paleoclimate
paleocean
age control
geoscientificInformation
Heinrich Events
Meridional Overturning Circulation (MOC)
193287 cal yr BP
136100 cal yr BP
Complete
37.561333
37.561333
-10.142167
-10.142167
-2637
-2637
Ocean
Atlantic Ocean
North Atlantic Ocean
MD01-2444>LATITUDE 37.561333>LONGITUDE -10.142167
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
Margari, V., L.C. Skinner, P.C. Tzedakis, A. Ganopolski, M. Vautravers and N.J. Shackleton. 2010. The nature of millennial-scale climate variability during the past two glacial periods. Nature Geoscience 3, 127 - 131.
During the last glacial period, iceberg discharges into the North Atlantic disrupted the meridional overturning circulation, leading to cooling in the Northern Hemisphere and warming in Antarctica. This asymmetric response can be explained by a bipolar see-saw mechanism, whereby changes in the strength of the meridional overturning circulation lead to changes in the interhemispheric heat transport. It is unclear, however, to what extent the response of the overturning circulation is a function of freshwater flux and boundary climate conditions. Here we use foraminiferal isotope and pollen records from the Portuguese margin to reconstruct surface- and deep-water hydrography and atmospheric changes during the last and penultimate glacial periods. When we compare our records with temperature reconstructions from Antarctica, we find that the bipolar see-saw was a characteristic feature of both glacial periods. However, the comparison also underlines the dependence of the bipolar see-saw on background climate and magnitude of iceberg discharge. It also suggests that an intensified hydrological cycle may lead to a weaker overturning circulation with a smaller disruption threshold and extended North Atlantic stadial durations.
STUDY NOTES: The following benthic species were analysed, and adjusted as indicated: Cibicidoides sp.: +0.51; Uvigerina peregrina and similar specimens: 0.0; Globobulimina affinis: -0.4; Cibicidoides wuellerstorfi, +0.64; Globocassidulina sp.: -0.1; Hoeglundina elegans: -0.7. MD01-2444 MIS3 isotope and faunal data in Vautravers and Shackleton, 2006.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/margari2010/margari2010.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11