noaa-ocean-12198
Eastern Equatorial Pacific 150KYr d15N and Corg Data
Dubois, N.; Kienast, M.
Eastern Equatorial Pacific 150KYr d15N and Corg Data
2011-09-26
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12198
Investigator
N.
Dubois
Investigator
M.
Kienast
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 15N,sediment,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
organic carbon,sediment,null,weight percent,null,paleoceanography,null,elemental analysis,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
nitrogen isotopes
geoscientificInformation
149700 cal yr BP
940 cal yr BP
Complete
-3.62
2.27
-90.95
-82.7867
-3210
-2203
Ocean
Pacific Ocean
Eastern Pacific Ocean
ME0005A-27JC>LATITUDE -1.8533>LONGITUDE -82.7867
Ocean
Pacific Ocean
Eastern Pacific Ocean
ME0005A-24JC>LATITUDE .021667>LONGITUDE -86.463
Ocean
Pacific Ocean
North Pacific Ocean
TR163-19P>LATITUDE 2.27>LONGITUDE -90.95
Ocean
Pacific Ocean
Eastern Pacific Ocean
TR163-31P>LATITUDE -3.62>LONGITUDE -83.97
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
Dubois, N. and M. Kienast. 2011.
Spatial reorganization in the equatorial divergence in the Eastern
Tropical Pacific during the last 150 kyr, Geophys. Res. Lett., 38,
L16606, doi:10.1029/2011GL048325.
High-resolution downcore records of bulk sediment nitrogen isotopes
(d15N) and organic carbon (Corg) contents from multiple Eastern
Tropical Pacific sites show remarkable uniformity during the last
glacial stage, whereas during the Holocene and the last interglacial
period, they diverge significantly. The close covariation of d15N
records during glacial stages points toward regional changes in
the background isotopic signal of the inorganic nitrate pool,
likely caused by variations in the denitrification rates in
the nearby suboxic zones. On the other hand, we attribute the
divergence of the d15N and Corg records during interglacial
periods to a spatial reorganization in the equatorial divergence.
We posit a southward displacement of the zone of strongest upwelling
in the South Equatorial Current to explain the reduced productivity
and higher nitrate consumption recorded at the equator during
warmer intervals.
STUDY NOTES: The data set contains bulk sediment d15N and Corg content
from 4 cores from the eastern equatorial Pacific covering
the late Quaternary. The sedimentary d15N composition
of all cores was analyzed at UBC, Vancouver, following
standard procedures. Total carbon was determined with an
elemental analyzer. Inorganic (i.e., carbonate mineral)
carbon was determined in a carbon dioxide coulometer.
Organic carbon was estimated by subtracting inorganic
from total carbon. Results for the last 35 kyr have been
published by Kienast et al. (2006, 2007). Age models
for the last 25 kyr are based on radiocarbon dates and
were adopted as previously published (see Dubois et al.,
2011 and references therein). For ages older than 25 kyr BP,
the age models of cores ME0005A-27JC, TR163-19P and TR163-31P
are based on oxygen isotope stratigraphy (correlation to the
global benthic stack LR04 (Lisiecki and Raymo, 2005)),
and the presence of an ash layer (Los Chocoyos Ash Layer
(Drexler et al., 1980)). The age model of core ME0005A-24JC
is modified from Lyle et al. (2005), with additional
correlation points to the opal, CaCO3 and SST records
of core ME0005A-27JC (previously published by
Dubois et al. (2010, 2011)).
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dubois2011b/dubois2011b.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/dubois2011b/dubois2011b.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11