noaa-ocean-10551
Western Equatorial Pacific ODP806B Late Pliocene Mg/Ca, d18O, and SST
Medina-Elizalde, M.; Lea, D.W.
Western Equatorial Pacific ODP806B Late Pliocene Mg/Ca, d18O, and SST
2011-03-18
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10551
Investigator
M.
Medina-Elizalde
Investigator
D.W.
Lea
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,G. ruber
earth science
paleoclimate
climate reconstructions|paleoceanography
delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil,null,climate reconstructions|paleoceanography,null,null,N,G. ruber
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
magnesium/calcium,Globigerinoides ruber,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,corrected,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globigerinoides ruber,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
reconstruction
geoscientificInformation
Sea Surface Temperature Reconstruction
Warm Pool
3087400 cal yr BP
2336900 cal yr BP
Complete
.32
.32
159.35
159.35
-2520
-2520
Ocean
Pacific Ocean
North Pacific Ocean
ODP 806B>LATITUDE .32>LONGITUDE 159.35
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
Medina-Elizalde, M. and D.W. Lea. 2010.
Late Pliocene equatorial Pacific.
Paleoceanography, 25, PA2208, doi:10.1029/2009PA001780
Late Pliocene foraminiferal Mg/Ca and d18O records from Ocean
Drilling Program Hole 806B in the western equatorial Pacific (WEP)
reveal warm pool climate evolution during the onset of Northern
Hemisphere glaciation, 3.1-2.3 Myr B.P. Mg/Ca data indicate an
average late Pliocene sea surface temperature (SST) of 27.8°C,
a small long-term cooling of 0.3°C between 3.1 and 2.3 Ma,
and a glacial-interglacial (G-I) SST range of 2°C throughout
this time interval. For comparison, Pleistocene SSTs at this site
over the last 0.9 Myr average 27.7°C with a G-I range of 3°C.
Orbital-scale variability in Hole 806B SSTs during the late
Pliocene occurs predominantly at ~100 ka, in contrast to
foraminiferal d18O records, which show a dominant 41 kyr period.
Variability at a 41 kyr period, out of phase with local annual
insolation changes driven by obliquity, is also observed in the
new WEP SST record. The WEP SST record suggests that an ~3°C
equatorial Pacific SST zonal gradient prevailed during the
late Pliocene, compatible with a weaker Walker circulation.
Adjustment of Hole 806B SSTs for past changes in seawater Mg/Ca
suggests that SSTs higher than 30°C prevailed at 3 Myr B.P.,
followed by a progressive cooling of the warm pool through
the late Pliocene. The characteristics of late Pliocene tropical
climate evolution suggest that atmospheric greenhouse gas forcing
played a major role in driving the observed G-I SST changes.
STUDY NOTES: Planktonic foraminiferal (G. ruber) Mg/Ca and d18O, plus Sea Surface
Temperature (SST) and d18Oseawater estimates, for the Late Pliocene
from Western Equatorial Pacific sediment core ODP806B.
SST estimated from G. ruber Mg/Ca by the method of Lea et al. [2000].
d18O seawater record was calculated by removing the temperature
component in planktonic d18O using the Mg/Ca derived SSTs and the
paleotemperature equation of Bemis et al., [1998].
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/medina-elizalde2010/medina-elizalde2010.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/medina-elizalde2010/medina-elizalde2010.xls
USA/NOAA
DIF
Version 9.8.4
2019-04-29
2019-04-29