noaa-lake-21890 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. Lake Malawi, East Africa 1.3 Million Year TEX86 Paleotemperature 2017-04-02 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/21890 Investigator T.C. Johnson Investigator J.P. Werne Investigator E.T. Brown Investigator A. Abbott Investigator M.A. Berke Investigator B. Steinman Investigator J. Halbur Investigator S. Contreras Investigator S. Grosshuesch Investigator A.L. Deino Investigator C.A. Scholz Investigator R.P. Lyons Investigator S. Schouten Investigator J.S. Sinninghe Damsté 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 reconstruction earth science paleoclimate paleolimnology geochemistry geoscientificInformation 1277346 cal yr BP 361 cal yr BP Complete -11.29389 -11.29389 34.43722 34.43722 500 500 Continent Africa Eastern Africa Malawi Lake Malawi, core GLAD7-MAL05-1>LATITUDE -11.29389>LONGITUDE 34.43722 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. 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 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 Damste 2016 Nature 537 7619 220-224 10.1038/nature19065 http://www.nature.com/nature/journal/v537/n7619/full/nature19065.html

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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016ca.txt Formatted Text Data File; Lake Malawi Calcium Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016temp.txt Formatted Text Data File; Lake Malawi TEX86 Paleotemperature GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016.xlsx Excel Data File; Lake Malawi All Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/malawi2016temprs.txt Formatted Text Data File; Lake Malawi TEX86 Paleotemperature Rescaled USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11