Lake Victoria 1,000 Year Diatom-Based Conductivity Reconstruction Stager, J.C.; Ryves, D.B.; Cumming, B.F.; Meeker, L.D.; Beer, J. Stager, J.C. Ryves, D.B. Cumming, B.F. Meeker, L.D. Beer, J. earth science/paleoclimate/paleolimnology (total shallow water diatoms,null,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (age,null,null,calendar year before present,null,climate reconstructions|paleolimnology,null,null,N,before 2000 CE) earth science/paleoclimate/climate reconstructions|paleolimnology (electrical conductivity,diatom assemblage|lake water,null,microsiemens per centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/climate reconstructions|paleolimnology (depth,null,null,centimeter,null,climate reconstructions|paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (Lake Victoria, Pilkington Bay core 64-2>LATITUDE .3>LONGITUDE 33.3333) A new diatom series with 1-6 year resolution from Lake Victoria, East Africa, shows that lake level minima occurred ca. 820-760, 680-660, 640-620, 370-340, and 220-150 calendar years BP. Inferred lake levels were exceptionally high during most of the Little Ice Age (ca. 600-200 calendar years BP). Synchrony between East African high lake levels and prolonged sunspot minima during much of the last millenium may reflect solar variability's effects on tropical rainfall, but those relationships reversed sign ca. 200 years ago. Historical records also show that Victoria lake levels rose during every peak of the ca. 11-year sunspot cycle since the late 19th century. These findings suggest that, if these apparent tropical sun-climate associations during the last millenium were real, then they were subject to abrupt sign reversals. STUDY NOTES: Lake Victoria High-Resolution Diatom-Based Conductivity Reconstruction. Shallow water diatom percentage and inferred conductivity, interpreted as a proxy for lake level over the last millennia. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Stager, J.C. Investigator : Ryves, D.B. Investigator : Cumming, B.F. Investigator : Meeker, L.D. Investigator : Beer, J. 2005-05-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5455 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/victoria2005.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/victoria2005.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/victoria2005.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/victoria2005.xls English https://www.ncdc.noaa.gov/paleo/study/5455 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/victoria2005.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/victoria2005.xls Stager, J.C., D. Ryves, B.F. Cumming, L.D. Meeker, J. Beer. 2005. Solar variability and the levels of Lake Victoria, East Africa, during the last millenium. Journal of Paleolimnology Vol. 33, Issue 2, Feb. 2005, pp. 243-251 START YEAR: 967 cal yr BP * END YEAR: 29 cal yr BP 33.3333 .3 33.3333 .3