Lake Edward 1400 Year High Resolution Calcite Mg Data Russell, J.M.; Johnson, T.C. Russell, J.M. Johnson, T.C. 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 (Lake Edward>LATITUDE -.4167>LONGITUDE 29.75) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Russell, J.M. Investigator : Johnson, T.C. 2007-03-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5452 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/edward2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/edward2007.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/edward2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/edward2007.txt English https://www.ncdc.noaa.gov/paleo/study/5452 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/edward2007.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/edward2007.txt 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 START YEAR: 1500 cal yr BP * END YEAR: 0 cal yr BP 29.75 -.4167 29.75 -.4167