noaa-ocean-6403
Congo River Basin 25KYr MBT/CBT Data and Air Temperature Reconstruction
Weijers, J.W.H.; Schefuss, E.; Schouten, S.; Sinninghe Damsté, J.S.
Congo River Basin 25KYr MBT/CBT Data and Air Temperature Reconstruction
2008-05-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/6403
Investigator
J.W.H.
Weijers
Investigator
E.
Schefuss
Investigator
S.
Schouten
Investigator
J.S.
Sinninghe Damsté
earth science
paleoclimate
climate reconstructions|paleoceanography
pH,glycerol dialkyl glycerol tetraether index|soil,null,dimensionless,null,climate reconstructions|paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,meter,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
methylation index of branched tetraethers,null,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,radiocarbon year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
air temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,mean air temperature over the Congo Basin
earth science
paleoclimate
paleoceanography
cyclization index of branched tetraethers,null,null,dimensionless,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
air temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,mean air temperature of the Congo River basin
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
biomarkers
earth science
paleoclimate
paleocean
reconstruction
earth science
paleoclimate
paleocean
age control
geoscientificInformation
Air Temperature Reconstruction
PAGES 2k Network
PAGES Africa 2k
25790 14C yr BP
30 14C yr BP
30657 cal yr BP
0 cal yr BP
Complete
-5.58
-5.58
11.22
11.22
-962
-962
Ocean
Atlantic Ocean
South Atlantic Ocean
GeoB 6518-1>LATITUDE -5.58>LONGITUDE 11.22
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
Weijers, J.W.H., E. Schefuss, S. Schouten, J.S. Sinninghe Damsté. 2007.
Coupled Thermal and Hydrological Evolution of Tropical Africa
over the Last Deglaciation.
Science, Vol.315, p.1701-1704.
doi: 10.1126/science.1138131
We analyzed the distribution of branched tetraether membrane lipids derived from
soil bacteria in a marine sediment record that was recovered close to the Congo
River outflow, and the results enabled us to reconstruct large-scale continental
temperature changes in tropical Africa that span the past 25,000 years. Tropical
African temperatures gradually increased from ~21° to 25°C over the last
deglaciation, which is a larger warming than estimated for the tropical Atlantic
Ocean. A direct comparison with sea-surface temperature estimates from the same
core revealed that the land-sea temperature difference was, through the thermal
pressure gradient, an important control on central African precipitation patterns.
STUDY NOTES: 25 ky MBT/CBT record for the Congo River Basin (central tropical Africa)
obtained from marine core GeoB 6518-1 situated in the Congo deep sea fan.
Annual mean air temperature and soil pH estimates have been obtained from
branched tetraether membrane lipids derived from soil bacteria and analysed
with high performance liquid chromatography / mass spectrometry (HPLC/MS).
Core Location:
GeoB 6518-1: 05°35.3'S, 11°13.3'E, 962m water depth (Congo Fan).
Age calibration of core:
Dating of core GeoB 6518-1 was carried out by means of fifteen 14C-AMS
dates on mixed planktonic foraminifera fractions containing
Globigerinoides ruber (white), Globigerinoides sacculifer and
Orbulina universa. Radiocarbon ages were converted to calendar ages
using the program CALIB 4.4 (using the marine calibration and applying
a reservoir effect of 400 years) and were linearly interpolated to provide
the core chronology.
Uncertainties:
The pH calibration range is from 3.3 to 8.2 and the temperature calibration
range is from -6.7 to 27.0°C, which covers the entire range of pH and
temperatures reconstructed from our core. The analytical reproducibility
based on pooled standard deviations of duplicate measurements of samples
is =< 0.01 units for the MBT index and ± 0.01 units for the CBT ratio,
or ± 0.02 pH units and ± 0.2°C in the temperature estimates.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weijers2007/weijers2007.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/gb6518-1-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/weijers2007/weijers2007.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11