noaa-ocean-13607
Equatorial Pacific 1.1 Million Year Nitrogen Isotope Data
Rafter, P.A.; Charles, C.D.
Equatorial Pacific 1.1 Million Year Nitrogen Isotope Data
2012-12-11
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13607
Investigator
P.A.
Rafter
Investigator
C.D.
Charles
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
notes,null,null,null,null,paleoceanography,null,null,C,ODP Site
earth science
paleoclimate
paleoceanography
delta 18O,Uvigerina sp.,null,per mil PDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,Site
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,SectionID2
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,SectionID
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
nitrogen isotopes
geoscientificInformation
1148000 cal yr BP
3000 cal yr BP
Complete
-1.2
.32
-110.52
159.35
-3851
-2520
Ocean
Pacific Ocean
North Pacific Ocean
ODP 849>LATITUDE .18>LONGITUDE -110.52
Ocean
Pacific Ocean
North Pacific Ocean
ODP 806B>LATITUDE .32>LONGITUDE 159.35
Ocean
Pacific Ocean
RC13-112>LATITUDE -1.2>LONGITUDE -101
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
Patrick A. Rafter and Christopher D. Charles. 2012.
Pleistocene equatorial Pacific dynamics inferred from the zonal asymmetry in sedimentary nitrogen isotopes.
Paleoceanography, Vol. 27, PA3102.
DOI: 10.1029/2012PA002367
There is little agreement among models in predicting the average state of the tropical Pacific when subjected to enhanced greenhouse gas forcing. This uncertainty emphasizes the importance of reconstructing past variability in tropical Pacific climate through episodes of significant and estimable radiative forcing. Thus far, efforts along these lines have concentrated primarily on inferences of sea surface temperature variability from deep-sea sediments. Here we offer a different view of the equatorial Pacific over the past ~1.2 million years (Myr) - before and after the mid-Pleistocene shift in the structure of ice ages. The zonal gradient in the nitrogen isotopic composition of sediment across the equatorial Pacific reflects nutrient delivery to the surface and, by extension, ocean dynamical properties. Over the last ~1.2 Myr, the variability of eastern equatorial Pacific nutrient upwelling (inferred from relative nitrate utilization) was highly correlated with local seasonal insolation. By contrast, nitrate utilization was insensitive to the 100,000 year cycle that dominated many other aspects of the Pleistocene ice ages, including greenhouse gas concentrations. A strong linear relationship between relative nitrate utilization and seasonal insolation over the past ~1 million years suggests a predictable response of one primary determinant of tropical Pacific climate change.
STUDY NOTES: Nitrogen isotope (d15N) data from Equatorial Pacific sediment cores for the past 1.1 million years
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rafter2012/rafter2012odp806.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rafter2012/rafter2012rc13-112.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rafter2012/rafter2012rndb74p.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rafter2012/rafter2012odp849.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/rafter2012/rafter2012dd15n.txt
USA/NOAA
DIF
Version 9.8.4
2019-04-29
2019-04-29