noaa-ocean-21091
West African Margin 25,000 Year Leaf Wax Isotope Data and Precipitation Reconstruction
Tierney, J.E.; Pausata, F.; deMenocal, P.B.
West African Margin 25,000 Year Leaf Wax Isotope Data and Precipitation Reconstruction
2017-01-18
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/21091
Investigator
J.E.
Tierney
Investigator
F.
Pausata
Investigator
P.B.
deMenocal
earth science
paleoclimate
paleoceanography
delta 2H,C30 n-alkanoic acid,null,per mil VSMOW,null,paleoceanography,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
precipitation,delta 13C|delta 2H,one standard deviation upper bound,millimeter,annual,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
delta 2H,delta 13C|delta 2H|precipitation,one standard deviation lower bound,per mil VSMOW,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
delta 2H,delta 13C|delta 2H|precipitation,one standard deviation upper bound,per mil VSMOW,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
precipitation,delta 13C|delta 2H,null,millimeter,annual,climate reconstructions|paleolimnology,null,null,N,median value
earth science
paleoclimate
climate reconstructions|paleolimnology
age,null,null,calendar year before present,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 2H,C30 n-alkanoic acid,null,per mil VSMOW,null,paleoceanography,corrected,null,N,IV correction from scaling benthic stack (LR04) to LGM change of 1 per mil in d18O space
earth science
paleoclimate
paleoceanography
delta 13C,C30 n-alkanoic acid,null,per mil VPDB,null,paleoceanography,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
delta 2H,delta 13C|delta 2H|precipitation,null,per mil VSMOW,null,climate reconstructions|paleolimnology,null,null,N,median value; from dD wax and d13C wax; Bayesian regression modeling
earth science
paleoclimate
climate reconstructions|paleolimnology
precipitation,delta 13C|delta 2H,one standard deviation lower bound,millimeter,annual,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
paleocean
biomarkers
earth science
paleoclimate
paleocean
reconstruction
geoscientificInformation
Precipitation Reconstruction
28847 cal yr BP
867 cal yr BP
Complete
19.363
30.879833
-17.854167
-10.629833
-2771
-1258
Ocean
Atlantic Ocean
North Atlantic Ocean
OCE437-07-GC68>LATITUDE 19.363>LONGITUDE -17.282333
Ocean
Atlantic Ocean
North Atlantic Ocean
OCE437-07-GC27>LATITUDE 30.879833>LONGITUDE -10.629833
Ocean
Atlantic Ocean
North Atlantic Ocean
OCE437-07-GC49>LATITUDE 23.206167>LONGITUDE -17.854167
Ocean
Atlantic Ocean
North Atlantic Ocean
OCE437-07-GC37>LATITUDE 26.81595>LONGITUDE -15.117717
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
Jessica E. Tierney, Francesco S.R. Pausata, Peter B. deMenocal
2017
Rainfall Regimes of the Green Sahara
Science Advances
3
1
e1601503
10.1126/sciadv.1601503
http://advances.sciencemag.org/content/3/1/e1601503
During the "Green Sahara" period (11,000 to 5000 years before the present), the Sahara desert received high amounts of rainfall, supporting diverse vegetation, permanent lakes, and human populations. Our knowledge of rainfall rates and the spatiotemporal extent of wet conditions has suffered from a lack of continuous sedimentary records. We present a quantitative reconstruction of western Saharan precipitation derived from leaf wax isotopes in marine sediments. Our data indicate that the Green Sahara extended to 31N and likely ended abruptly. We find evidence for a prolonged "pause" in Green Sahara conditions 8000 years ago, coincident with a temporary abandonment of occupational sites by Neolithic humans. The rainfall rates inferred from our data are best explained by strong vegetation and dust feedbacks; without these mechanisms, climate models systematically fail to reproduce the Green Sahara. This study suggests that accurate simulations of future climate change in the Sahara and Sahel will require improvements in our ability to simulate vegetation and dust feedbacks.
STUDY NOTES: Leaf wax isotope (dD and d13C) and West African precipitation reconstruction from 4 West African Margin marine sediment cores.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/tierney2017/tierney2017gc49.txt
Data File; Core OCE437-7-GC49 Leaf Wax Isotope Data and Precipitation Reconstruction
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/tierney2017/tierney2017gc68.txt
Data File; Core OCE437-7-GC68 Leaf Wax Isotope Data and Precipitation Reconstruction
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/tierney2017/tierney2017gc37.txt
Data File; Core OCE437-7-GC37 Leaf Wax Isotope Data and Precipitation Reconstruction
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/tierney2017/tierney2017gc27.txt
Data File; Core OCE437-7-GC27 Leaf Wax Isotope Data and Precipitation Reconstruction
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11