noaa-lake-5452
Lake Edward 1400 Year High Resolution Calcite Mg Data
Russell, J.M.; Johnson, T.C.
Lake Edward 1400 Year High Resolution Calcite Mg Data
2007-03-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5452
Investigator
J.M.
Russell
Investigator
T.C.
Johnson
earth science
paleoclimate
paleolimnology
magnesium,calcite,null,percent,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
age,null,null,year Common Era,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
geochemistry
geoscientificInformation
1500 cal yr BP
0 cal yr BP
Complete
-.4167
-.4167
29.75
29.75
917
917
Continent
Africa
Eastern Africa
Lake Edward>LATITUDE -.4167>LONGITUDE 29.75
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
Russell, J.M., T.C. Johnson. 2007. Little Ice Age drought in equatorial Africa: Intertropical Convergence Zone migrations and El Nino-Southern Oscillation variability. Geology Vol. 35, No. 1, pp. 21-24
High-resolution analyses of the Mg concentration in authigenic calcite in five cores from Lake Edward provide a water balance history of central equatorial Africa spanning the past 1400 yr. A high ratio of Mg to Ca (%Mg) indicates strong droughts in central Africa during the Little Ice Age (A.D. 1400-1750), in contrast to records from Lake Naivasha, Kenya, which suggest a wet Little Ice Age. This spatial pattern in Africa likely arose due to coupled changes in the high latitudes, the position of the Intertropical Convergence Zone, and the El Niņo-Southern Oscillation (ENSO) system. Our results further suggest that the patterns and variability of twentieth-century rainfall in central Africa have been unusually conducive to human welfare in the context of the past 1400 yr.
STUDY NOTES: Analyses of authigenic calcite %Mg spanning the past 1400 cal yr B.P. from
Lake Edward, East African Rift Valley, Uganda/Democratic Republic of the Congo.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/edward2007.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/edward2007.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11