noaa-lake-23690 West Turkana, Kenya 1.9-1.4 Ma Leaf Wax Hydrogen and Carbon Isotope Data Lupien, R.L.; Russell, J.M.; Feibel, C.; Beck, C.; Castañeda, I.S.; Deino, A.L.; Cohen, A.S. West Turkana, Kenya 1.9-1.4 Ma Leaf Wax Hydrogen and Carbon Isotope Data 2018-03-23 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/23690 Investigator R.L. Lupien Investigator J.M. Russell Investigator C. Feibel Investigator C. Beck Investigator I.S. Castañeda Investigator A.L. Deino Investigator A.S. Cohen earth science paleoclimate climate reconstructions|paleolimnology age,null,null,million years ago,null,climate reconstructions|paleolimnology,null,null,N,null earth science paleoclimate climate reconstructions|paleolimnology C3 plants,delta 13C,null,percent,null,climate reconstructions|paleolimnology,null,null,N,derived from a linear mixing model of the d13Cwax earth science paleoclimate climate reconstructions|paleolimnology delta 2H,precipitation,null,per mil,null,climate reconstructions|paleolimnology,null,null,N,derived following methods in Konecky et al. 2016 earth science paleoclimate paleolimnology delta 13C,C28 n-alkanoic acid,null,per mil,null,paleolimnology,null,isotope ratio mass spectrometry,N,null earth science paleoclimate climate reconstructions|paleolimnology depth,null,null,meter,null,climate reconstructions|paleolimnology,null,null,N,null earth science paleoclimate paleolimnology delta 2H,C28 n-alkanoic acid,null,per mil,null,paleolimnology,null,isotope ratio mass spectrometry,N,null earth science paleoclimate paleolimnology carbon isotopes earth science paleoclimate paleolimnology hydrogen isotopes geoscientificInformation 1867200 cal yr BP 1378900 cal yr BP Complete 4.1097 4.1097 35.8718 35.8718 404 404 Continent Africa Eastern Africa Kenya West Turkana HSPDP-WTK13-1A>LATITUDE 4.1097>LONGITUDE 35.8718 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

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Boulder CO 80305-3328 USA online ASCII R.L. Lupien, J.M. Russell, C. Feibel, C. Beck, I. Castañeda, A. Deino, A.S. Cohen 2018 Quaternary Science Reviews 186 225-235 10.1016/j.quascirev.2018.03.012 https://www.sciencedirect.com/science/article/pii/S0277379117306169

Climate is thought to play a critical role in human evolution; however, this hypothesis is difficult to test due to a lack of long, high-quality paleoclimate records from key hominin fossil locales. To address this issue, we analyzed organic geochemical indicators of climate in a drill core from West Turkana, Kenya that spans ~1.9-1.4 Ma, an interval that includes several important hominin evolutionary transitions. We analyzed the hydrogen isotopic composition of terrestrial plant waxes (dDwax) to reconstruct orbital-timescale changes in regional hydrology and their relationship with global climate forcings and the hominin fossil record. Our data indicate little change in the long-term mean hydroclimate during this interval, in contrast to inferred changes in the level of Lake Turkana, suggesting that lake level may be responding dominantly to deltaic progradation or tectonically-driven changes in basin configuration as opposed to hydroclimate. Time-series spectral analyses of the isotopic data reveal strong precession-band (21 kyr) periodicity, indicating that regional hydroclimate was strongly affected by changes in insolation. We observe an interval of particularly high-amplitude hydrologic variation at ~1.7 Ma, which occurs during a time of high orbital eccentricity hence large changes in processionally-driven insolation amplitude. This interval overlaps with multiple hominin species turnovers, the appearance of new stone tool technology, and hominin dispersal out of Africa, supporting the notion that climate variability played an important role in hominin evolution. STUDY NOTES: Hydrogen and carbon isotopes of higher plant leaf waxes (dDwax and d13Cwax) from West Turkana, Kenya, covering ~1.9-1.4 Ma.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/wturkana2018iso.txt NOAA Template File; West Turkana Leaf Wax Hydrogen and Carbon Isotope Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11