noaa-lake-5446
Lake Malawi 24000 Year TEX86 Surface Temperature Reconstruction
Powers, L.A.; Johnson, T.C.; Werne, J.P.; Castañeda, I.S.; Hopmans, E.C.; Sinninghe Damste, J.S.; Schouten, S.
Lake Malawi 24000 Year TEX86 Surface Temperature Reconstruction
2005-04-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5446
Investigator
L.A.
Powers
Investigator
T.C.
Johnson
Investigator
J.P.
Werne
Investigator
I.S.
Castañeda
Investigator
E.C.
Hopmans
Investigator
J.S.
Sinninghe Damste
Investigator
S.
Schouten
earth science
paleoclimate
climate reconstructions|paleolimnology
lake surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,annual,climate reconstructions|paleolimnology,null,null,N,TEX86
earth science
paleoclimate
climate reconstructions|paleolimnology
age,null,null,calendar kiloyear before present,null,climate reconstructions|paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
tetraether index of 86 carbon atoms,sediment,null,dimensionless,null,paleolimnology,averaged,null,N,null
earth science
paleoclimate
climate reconstructions|paleolimnology
lake surface temperature,glycerol dialkyl glycerol tetraether index,one standard deviation,degree Celsius,annual,climate reconstructions|paleolimnology,null,null,N,TEX86
earth science
paleoclimate
paleolimnology
reconstruction
geoscientificInformation
Air Temperature Reconstruction
PAGES 2k Network
PAGES Africa 2k
23880 cal yr BP
250 cal yr BP
Complete
-10.265
-9.97667
34.23
34.3183
Continent
Africa
Eastern Africa
Malawi
Lake Malawi, core M98-1P>LATITUDE -10.265>LONGITUDE 34.3183
Continent
Africa
Eastern Africa
Malawi
Lake Malawi, core M98-2P>LATITUDE -9.97667>LONGITUDE 34.23
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
Powers, L.A., T.C. Johnson, J.P. Werne, I.S. Castañeda, E.C. Hopmans,
J.S. Sinninghe Damsté, and S. Schouten. 2005.
Large temperature variability in the southern African tropics since
the Last Glacial Maximum.
Geophysical Research Letters, 32, L08706, doi:10.1029/2004GL022014.
The role of the tropics in global climate change is actively debated,
particularly in regard to the timing and magnitude of thermal and
hydrological response. Continuous, high-resolution temperature records
through the Last Glacial Maximum (LGM) from tropical oceans have
provided much insight but surface temperature reconstructions do not
exist from tropical continental environments. Here we used the TEX86
paleotemperature proxy to reconstruct mean annual lake surface
temperatures through the Last Glacial Maximum (LGM) in Lake Malawi,
East Africa (9º-14ºS). We find a ~3.5ºC overall warming since the LGM,
with temperature reversals of ~ 2ºC during the Younger Dryas (12.5 ka BP)
and at 8.2 ka BP. Maximum Holocene temperatures of ~29ºC were found
at 5 ka BP, a period preceding severe drought in Africa. These results
suggest a substantial thermal response of southeastern tropical Africa
to deglaciation and to varying conditions during the Holocene.
STUDY NOTES: The dataset is a paleotemperature reconstruction of mean annual surface
temperature from the north basin of Lake Malawi, East Africa using the
TEX86 paleothermometer. (TetraEther indeX of tetraethers with 86 carbon atoms).
The age model for these cores is already available for previous Lake Malawi MP98
data sets on this website.
TEX86 values are means of replicate analyses. All samples were measured at least
in duplicate, half of samples were measured at least in triplicate. The calibration
equation used to calculate mean annual lake surface temperatures (LST) is
LST=(TEX86-0.25)/0.017 with a calibration error of +/- 2 degrees C.
Lake Malawi core M98-1P: 10º15.9'S, 34º19.1'E, water depth 403m.
Lake Malawi core M98-2P: 9º58.6'S, 34º13.8'E, water depth 363m.
Lake surface elevation 474m.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2005.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11