Lake Malawi, East Africa 1.3 Million Year TEX86 Paleotemperature Johnson, T.C.; Werne, J.P.; Brown, E.T.; Abbott, A.; Berke, M.A.; Steinman, B.; Halbur, J.; Contreras, S.; Grosshuesch, S.; Deino, A.L.; Scholz, C.A.; Lyons, R.P.; Schouten, S.; Sinninghe Damsté, J.S. Johnson, T.C. Werne, J.P. Brown, E.T. Abbott, A. Berke, M.A. Steinman, B. Halbur, J. Contreras, S. Grosshuesch, S. Deino, A.L. Scholz, C.A. Lyons, R.P. Schouten, S. Sinninghe Damsté, J.S. earth science/paleoclimate/climate reconstructions|paleolimnology (notes,null,null,null,null,climate reconstructions|paleolimnology,null,null,C,*indicates an assigned less extraneous LL drop in line with surrounding values) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,annual,climate reconstructions|paleolimnology,null,null,N,AgeScale rescaling of Corrected Temps using Pointers for pointers; based on TEX86) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,annual,climate reconstructions|paleolimnology,null,null,N,C&S 2015; based on TEX86) earth science/paleoclimate/climate reconstructions|paleolimnology (lake level,null,null,meter,null,climate reconstructions|paleolimnology,corrected,null,N,meters relative to modern lake level; Lake Level is not allowed to rise above present overflowing level) earth science/paleoclimate/paleolimnology (tetraether index of 86 carbon atoms,sediment,null,dimensionless,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,null) earth science/paleoclimate/climate reconstructions|paleolimnology (lake level,null,null,meter,null,climate reconstructions|paleolimnology,null,null,N,meters relative to modern lake level) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,annual,climate reconstructions|paleolimnology,smoothed,null,N,C&S 2015; this is the basis for the tuning to LR04 with known ages as pointers; 5 point smoothed; based on TEX86) earth science/paleoclimate/paleolimnology (principal component,null,null,dimensionless,null,paleolimnology,null,null,N," Lyons; First PC of f four sediment parameters: natural gamma radiation"","" C/N ratio and δ13C of bulk organic matter"","" and reflected colour of the core digital image. ") earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,annual,climate reconstructions|paleolimnology,corrected,null,N,C&S 2015; lapse-rate corrected; based on TEX86) earth science/paleoclimate/climate reconstructions|paleolimnology (lake surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,annual,climate reconstructions|paleolimnology,smoothed,null,N,AgeScale rescaling of Crrcted Temps using Pointers for pointers; 5 point smooth; based on TEX86) earth science/paleoclimate/climate reconstructions|paleolimnology (depth,null,null,meter,null,climate reconstructions|paleolimnology,null,null,N,meters below lake floor) earth science/paleoclimate/paleolimnology (depth,null,null,meter,null,paleolimnology,null,null,N,meters below lake floor) earth science/paleoclimate/paleolimnology (calcium,sediment,null,count per minute,null,paleolimnology,smoothed,null,N,20 point smoothed; 1000 counts per minute) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Lake Malawi, core GLAD7-MAL05-1>LATITUDE -11.29389>LONGITUDE 34.43722) African climate is generally considered to have evolved towards progressively drier conditions over the past few million years, with increased variability as glacial-interglacial change intensified worldwide. Palaeoclimate records derived mainly from northern Africa exhibit a 100,000-year (eccentricity) cycle overprinted on a pronounced 20,000-year (precession) beat, driven by orbital forcing of summer insolation, global ice volume and long-lived atmospheric greenhouse gases. Here we present a 1.3-million-year-long climate history from the Lake Malawi basin (10-14S in eastern Africa), which displays strong 100,000-year (eccentricity) cycles of temperature and rainfall following the Mid-Pleistocene Transition around 900,000 years ago. Interglacial periods were relatively warm and moist, while ice ages were cool and dry. The Malawi record shows limited evidence for precessional variability, which we attribute to the opposing effects of austral summer insolation and the temporal/spatial pattern of sea surface temperature in the Indian Ocean. The temperature history of the Malawi basin, at least for the past 500,000 years, strongly resembles past changes in atmospheric carbon dioxide and terrigenous dust flux in the tropical Pacific Ocean, but not in global ice volume. Climate in this sector of eastern Africa (unlike northern Africa) evolved from a predominantly arid environment with high-frequency variability to generally wetter conditions with more prolonged wet and dry intervals. STUDY NOTES: TEX86 paleotemperature and Ca abundance (XRF) data from sediments collected in Lake Malawi, East Africa for the past 1.3 million years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Johnson, T.C. Investigator : Werne, J.P. Investigator : Brown, E.T. Investigator : Abbott, A. Investigator : Berke, M.A. Investigator : Steinman, B. Investigator : Halbur, J. Investigator : Contreras, S. Investigator : Grosshuesch, S. Investigator : Deino, A.L. Investigator : Scholz, C.A. Investigator : Lyons, R.P. Investigator : Schouten, S. Investigator : Sinninghe Damsté, J.S. 2017-04-02 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/21890 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016ca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016temp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016temprs.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016ca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016temp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016temprs.txt English https://www.ncdc.noaa.gov/paleo/study/21890 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016ca.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016temp.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016temprs.txt T.C. Johnson, J.P. Werne, E.T. Brown, A. Abbott, M. Berke, B.A. Steinman, J. Halbur, S. Contreras, S. Grosshuesch, A. Deino, C.A. Scholz, R.P. Lyons, S. Schouten, and J.S. Sinninghe Damste2016A progressively wetter climate in southern East Africa over the past 1.3 million yearsNature5377619220-22410.1038/nature19065http://www.nature.com/nature/journal/v537/n7619/full/nature19065.html START YEAR: 1277346 cal yr BP * END YEAR: 361 cal yr BP 34.43722 -11.29389 34.43722 -11.29389