noaa-ocean-10356
Eastern Equatorial Pacific ODP849 85KYr Radionuclide and Major Element Data
Pichat, S.; Sims, K.W.W.; François, R.; McManus, J.F.; Brown-Leger, S.; Albarède, F.
Eastern Equatorial Pacific ODP849 85KYr Radionuclide and Major Element Data
2011-01-07
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10356
Investigator
S.
Pichat
Investigator
K.W.W.
Sims
Investigator
R.
François
Investigator
J.F.
McManus
Investigator
S.
Brown-Leger
Investigator
F.
Albarède
earth science
paleoclimate
paleoceanography
mineral matter,sediment,null,percent,null,paleoceanography,null,null,N,terrigenous sediment
earth science
paleoclimate
paleoceanography
biogenic silica,sediment,null,percent,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
aluminum,sediment,null,weight percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
manganese,sediment,null,weight percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
manganese oxide,sediment,null,percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
silicon,sediment,null,weight percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
carbonate,sediment,null,percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
calcium,sediment,null,weight percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
iron,sediment,null,weight percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
titanium,sediment,null,weight percent,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
radiogenic isotope
geoscientificInformation
85360 cal yr BP
4350 cal yr BP
Complete
.18
.18
-110.52
-110.52
-3839
-3839
Ocean
Pacific Ocean
North Pacific Ocean
ODP 849>LATITUDE .18>LONGITUDE -110.52
None
Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.
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
Pichat, S., K.W.W. Sims, R. François, J.F. McManus, S. Brown Leger,
and F. Albarède. 2004.
Lower export production during glacial periods in the equatorial
Pacific derived from (231Pa/230Th)xs,0 measurements in deep-sea
sediments.
Paleoceanography, 19, PA4023, doi:10.1029/2003PA000994.
The (231Pa/230Th)xs,0 records obtained from two cores from the
western (MD97-2138; 1°25'S, 146°24'E, 1900 m) and eastern (Ocean
Drilling Program Leg 138 Site 849, 0°11.59'N, 110°31.18'W, 3851 m)
equatorial Pacific display similar variability over the last 85,000
years, i.e., from isotopic stages 1 to 5a, with systematically
higher values during the Holocene, isotopic stage 3, and isotopic
stage 5a, and lower values, approaching the production rate ratio
of the two isotopes (0.093), during the colder periods corresponding
to isotopic stages 2 and 4. We have also measured the 230Th-normalized
biogenic preserved and terrigenous fluxes, as well as major and trace
elements concentrations, in both cores. The (231Pa/230Th)xs,0 results
combined with the changes in preserved carbonate and opal fluxes
at the eastern site indicate lower productivity in the eastern
equatorial Pacific during glacial periods. The (231Pa/230Th)xs,0
variations in the western equatorial Pacific also seem to be
controlled by productivity (carbonate and/or opal). The generally
high (231Pa/230Th)xs,0 ratios (>0.093) of the profile could be due
to opal and/or MnO2 in the sinking particles. The profiles of
(231Pa/230Th)xs,0 and 230Th-normalized fluxes indicate a decrease
in exported carbonate, and possibly opal, during isotopic stages 2
and 4 in MD97-2138. Using 230Th-normalized flux, we also show that
sediments from the two cores were strongly affected by sediment
redistribution by bottom currents suggesting a control of mass
accumulation rates by sediment focusing variability.
STUDY NOTES: 230Th, 231Pa, 232Th, 238U activities, (231Pa/230Th)xs,0 ratio,
opal, carbonate, MnO2 and major elements concentrations for ODP849.
Radionuclide concentrations were obtained by isotope dilution
SF-ICP-MS. Major elements concentrations were measured by ICP-AES.
Opal, carbonate and MnO2 were determined by normative calculations.
Age model is based on oxygen isotope stratigraphy on Cibicides
wuellerstorfi (Mix et al., 1995).
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pichat2004/pichat2004.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pichat2004/pichat2004.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11