noaa-lake-16589 Lake Turkana, Kenya, 6000 Year TEX86 Temperature Berke, M.A.; Johnson, T.C.; Werne, J.P.; Schouten, S.; Sinninghe Damsté, J.S. Lake Turkana, Kenya, 6000 Year TEX86 Temperature 2014-06-18 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16589 Investigator M.A. Berke Investigator T.C. Johnson Investigator J.P. Werne Investigator S. Schouten Investigator J.S. Sinninghe Damsté earth science paleoclimate paleolimnology branched and isoprenoid tetraether index,sediment,null,dimensionless,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology tetraether index of 86 carbon atoms,sediment,null,dimensionless,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology notes,null,null,null,null,paleolimnology,null,null,C,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 surface temperature,glycerol dialkyl glycerol tetraether index,null,degree Celsius,annual,climate reconstructions|paleolimnology,null,null,N,TEX86 Kim 2010 Calibration earth science paleoclimate climate reconstructions|paleolimnology depth,null,null,centimeter,null,climate reconstructions|paleolimnology,composited,null,N,null earth science paleoclimate paleolimnology reconstruction earth science paleoclimate paleolimnology geochemistry geoscientificInformation 6022 cal yr BP -40 cal yr BP Complete 2.7 3.76 35.95 36.537 360 360 Continent Africa Eastern Africa Kenya Lake Turkana LT84-7P>LATITUDE 3.76>LONGITUDE 35.95 Continent Africa Eastern Africa Kenya Lake Turkana LT94-14FC>LATITUDE 2.7>LONGITUDE 36.487 Continent Africa Eastern Africa Kenya Lake Turkana LT84-2P>LATITUDE 2.7125>LONGITUDE 36.537 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 Melissa A. Berke, Thomas C. Johnson, Josef P. Werne, Stefan Schouten, Jaap S. Sinninghe Damsté 2012 Earth and Planetary Science Letters 351-352 95-104 10.1016/j.epsl.2012.07.008 http://www.sciencedirect.com/science/article/pii/S0012821X12003676

The termination of the African Humid Period (AHP) about 5 thousand years ago (ka) was the most dramatic climate shift in northern and equatorial Africa since the end of the Pleistocene. Based on TEX86 paleotemperature data from Lake Turkana, Kenya, we show that a temperature shift of 2-4C occurred over the two millennia spanning the end of the AHP, with the warmest conditions occurring at ~5 ka. We note a similar shift, though of a smaller magnitude, in other East African temperature records from Lakes Malawi and Tanganyika, as well as Mt. Kilimanjaro. Additionally, we document the temperature history for the last 220 years from Lake Turkana that indicates the thermal anomaly at 5 ka was warmer than the present day Lake Turkana temperatures and on par with modern temperatures of Lakes Tanganyika and Malawi. We suggest that the thermal response at the end of the AHP may be linked to local insolation during September-November, when local air temperature rises to an annual maximum over Lakes Malawi and Tanganyika and a secondary maximum over Lake Turkana and Mt. Kilimanjaro. September-November insolation peaked at ~5 ka and likely caused air and water temperatures in the region to rise to maxima at that time. STUDY NOTES: This dataset includes TEX86 data from Lake Turkana cores LT84-2P, LT84-7P, and LT94-14FC. The TEX86 temperature data are provided with both the uncalibrated TEX86 value and and the Kim et al., 2010 calibration used in the manuscript. Also, the calculated BIT Index (as described in the text) are provided here.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/turkana2012lt84-2p.txt Data File; Lake Turkana Core LT84-2P TEX86 and Temperature GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/turkana2012lt84-7p.txt Data File; Lake Turkana Core LT84-7P TEX86 and Temperature GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/turkana2012lt94.txt Data File; Lake Turkana Core LT94-14FC TEX86 and Temperature USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11