noaa-ocean-12916
Panama Basin 27,000 Year Alkenone dD Data
Pahnke, K.; Sachs, J.P.; Keigwin, L.D.; Timmermann, A.; Xie, S.-P.
Panama Basin 27,000 Year Alkenone dD Data
2012-05-21
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/12916
Investigator
K.
Pahnke
Investigator
J.P.
Sachs
Investigator
L.D.
Keigwin
Investigator
A.
Timmermann
Investigator
S.-P.
Xie
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
alkenone,sediment,null,parts per million,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 2H,alkenone,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 2H,alkenone,one standard deviation,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
alkenone unsaturation index Uk37 prime,null,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
biomarkers
earth science
paleoclimate
paleocean
reconstruction
geoscientificInformation
hydrology
27090 cal yr BP
-30 cal yr BP
Complete
4.665
5.8468
-77.9633
-77.6142
-2200
-884
Ocean
Pacific Ocean
Eastern Pacific Ocean
KN176-2-MC14>LATITUDE 5.8468>LONGITUDE -77.6142
Ocean
Pacific Ocean
Eastern Pacific Ocean
KN176-2-MC33>LATITUDE 4.665>LONGITUDE -77.9633
Ocean
Pacific Ocean
Eastern Pacific Ocean
KN176-2-JPC32>LATITUDE 4.6665>LONGITUDE -77.9633
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
Pahnke, K., J.P. Sachs, L. Keigwin, A. Timmermann, and S.-P. Xie. 2007.
Eastern tropical Pacific hydrologic changes during the past 27,000
years from D/H ratios in alkenones.
Paleoceanography, Vol. 22, PA4214, 15 PP.
doi:10.1029/2007PA001468
The tropical Pacific plays a central role in the climate system
by providing large diabatic heating that drives the global
atmospheric circulation. Quantifying the role of the tropics
in late Pleistocene climate change has been hampered by the paucity
of paleoclimate records from this region and the lack of realistic
transient climate model simulations covering this period. Here we
present records of hydrogen isotope ratios (dD) of alkenones from
the Panama Basin off the Colombian coast that document hydrologic
changes in equatorial South America and the eastern tropical Pacific
over the past 27,000 years (a) and the past 3 centuries in detail.
Comparison of alkenone dD values with instrumental records of
precipitation over the past ~100 a suggests that dD can be used
as a hydrologic proxy. On long timescales our records indicate
reduced rainfall during the last glacial period that can be explained
by a southward shift of the mean position of the Intertropical
Convergence Zone and an associated reduction of Pacific moisture
transport into Colombia. Precipitation increases at ~17 ka
in concert with sea surface temperature (SST) cooling in the North
Atlantic and the eastern tropical Pacific. A regional coupled model,
forced by negative SST anomalies in the Caribbean, simulates an
intensification of northeasterly trade winds across Central America,
increased evaporative cooling, and a band of increased rainfall
in the northeastern tropical Pacific. These results are consistent
with the alkenone SST and dD reconstructions that suggest increasing
precipitation and SST cooling at the time of Heinrich event 1.
STUDY NOTES: Hydrogen isotope ratios (dD) of alkenones from 3 cores collected
in the Panama Basin in the eastern tropical Pacific for the past
27,000 years. Alkenone dD values document hydrologic changes in
equatorial South America and the eastern tropical Pacific.
Alkenone SST's calculated using the calibration of Prahl et al.,
GCA 1988.
core locations:
KN176-2 JPC32: 4°39.99N, 77°57.80W, 2200m water depth
KN176-2 MC14: 4°50.81N, 77°36.85W, 884m water depth
KN176-2 MC33: 4°39.99N, 77°57.80W, 2200m water depth
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pahnke2007/pahnke2007.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/pahnke2007/pahnke2007.txt
USA/NOAA
DIF
Version 9.8.4
2019-02-19
2019-02-19