{"NOAAStudyId":"16677","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2014-06-18","dataPublisher":"NOAA","dataType":"PALEOLIMNOLOGY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/lake","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-lake-16677.xml","doi":null,"earliestYearBP":14334,"earliestYearCE":-12384,"entryId":"noaa-lake-16677","funding":[{"fundingAgency":"European Research Council","fundingGrant":"226600"},{"fundingAgency":"US NOAA","fundingGrant":"NA-060-AR4310113"}],"investigators":"Berke, M.A.; Johnson, T.C.; Werne, J.P.; Livingstone, D.A.; Grice, K.; Schouten, S.; Sinninghe Damsté, J.S.","mostRecentYearBP":7117,"mostRecentYearCE":-5167,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/16677","originalSource":null,"publication":[{"abstract":"New biomarker analyses from Lake Albert, East Africa spanning ~15-9 ka show the most extreme, abrupt, multi-stage climate and environmental shifts during the last deglacial transition of anywhere in Africa. Records of hydroclimate expressed in compound specific dD values from terrestrial leaf waxes and a TEX86 paleotemperature record support multiple stages of pronounced drying and cooling from 13.8 to 11.5 ka and demonstrate the dynamic behavior of the low latitude tropics during the deglaciation. The vegetation response, illustrated by compound specific d13C values and fossil pollen records, was an expansion of C4 grassland when the region was cool and arid. These results advance our understanding of a spatially and temporally complex regional response to global climate forcing, suggesting weakening of the Indian Ocean monsoon at the end of the Pleistocene that coincides with a minor decrease in the rate of the Atlantic Meridional Overturning Circulation (AMOC) and during a time of stepwise cooling in the northern high latitudes.","author":{"name":"Melissa A. Berke, Thomas C. Johnson, Josef P. Werne, Daniel A. Livingstone, Kliti Grice, Stefan Schouten, Jaap S. Sinninghe Damsté "},"citation":"Melissa A. Berke, Thomas C. Johnson, Josef P. Werne, Daniel A. Livingstone, Kliti Grice, Stefan Schouten, Jaap S. Sinninghe Damsté. 2014. Characterization of the last deglacial transition in tropical East Africa: Insights from Lake Albert. Palaeogeography, Palaeoclimatology, Palaeoecology, 409, 1-8. doi: 10.1016/j.palaeo.2014.04.014","edition":null,"identifier":{"id":"10.1016/j.palaeo.2014.04.014","type":"doi","url":"http://dx.doi.org/10.1016/j.palaeo.2014.04.014"},"issue":null,"journal":"Palaeogeography, Palaeoclimatology, Palaeoecology","pages":"1-8","pubRank":"1","pubYear":2014,"reportNumber":null,"title":"Characterization of the last deglacial transition in tropical East Africa: Insights from Lake Albert","type":"publication","volume":"409"}],"reconstruction":"N","scienceKeywords":["hydrology"],"site":[{"NOAASiteId":"56032","geo":{"geoType":"Feature","geometry":{"coordinates":["1.835","31.17"],"type":"POINT"},"properties":{"easternmostLongitude":"31.17","maxElevationMeters":"615","minElevationMeters":"615","northernmostLatitude":"1.835","southernmostLatitude":"1.835","westernmostLongitude":"31.17"}},"locationName":"Continent>Africa>Eastern Africa","mappable":"Y","paleoData":[{"NOAADataTableId":"26869","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/albert2014.txt","linkText":"albert2014.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":"average of replicates; corrected for ice volume","cvDataType":"PALEOLIMNOLOGY","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid>C28 n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":"averaged","cvError":"unspecified margin of error","cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid>C28 n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":"C-29 + C-31 + C33 acids","cvDataType":"PALEOLIMNOLOGY","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":"C-29 + C-31 + C33 acids","cvDataType":"PALEOLIMNOLOGY","cvDetail":"averaged","cvError":"unspecified margin of error","cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil PDB","cvWhat":"chemical composition>isotope>isotope ratio>delta 13C"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>sample identification"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar year before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>compound>organic compound>organic compound index>tetraether index of 86 carbon atoms"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"chemical composition>compound>organic compound>organic compound index>branched and isoprenoid tetraether index"},{"cvAdditionalInfo":"average of replicates","cvDataType":"PALEOLIMNOLOGY","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid>C28 n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":"average of replicates; corrected for ice volume","cvDataType":"PALEOLIMNOLOGY","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid>C28 n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"}]}],"dataTableName":"Albert2014TEX86","dataTableNotes":null,"earliestYear":14334,"earliestYearBP":14334,"earliestYearCE":-12384,"mostRecentYear":7117,"mostRecentYearBP":7117,"mostRecentYearCE":-5167,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Lake Albert Core F"}],"studyCode":null,"studyName":"Lake Albert, East Africa 7-14KYrBP TEX86 and Leaf Wax dD and d13C Data","studyNotes":"This dataset includes TEX86, dD of leaf wax n-alkanoic acids (C28 chain length), and d13C of \nn-alkane (weighted mean of the C29, C31, C33 chain lengths). TEX86 data includes TEX86 value and calibrated temperature (using Kim et al., 2010 \nas described in the text). This dataset also includes BIT Index determined. \ndD dataset includes the leaf wax n-alkanoic value (mean of multiple measurements, with standard deviation indicated). \nd13C n-alkane data was based on the weighted mean of the C29, C31, C33 chain lengths (most abudant long chain lengths).\nStandard deviation of replicates is shown. ","version":"1.0","xmlId":"14386"}