{"NOAAStudyId":"16618","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-16618.xml","doi":null,"earliestYearBP":15176,"earliestYearCE":-13226,"entryId":"noaa-lake-16618","funding":[{"fundingAgency":"US NOAA","fundingGrant":"NA-060-AR4310113"},{"fundingAgency":"European Research Council","fundingGrant":"226600"}],"investigators":"Berke, M.A.; Johnson, T.C.; Werne, J.P.; Grice, K.; Schouten, S.; Sinninghe Damsté, J.S.","mostRecentYearBP":1372,"mostRecentYearCE":578,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/16618","originalSource":null,"publication":[{"abstract":"New molecular proxies of temperature and hydrology are helping to constrain tropical climate change and elucidate possible forcing mechanisms during the Holocene. Here, we examine a ~14,000 year record of climate variability from Lake Victoria, East Africa, the world's second largest freshwater lake by surface area. We determined variations in local hydroclimate using compound specific dD of terrestrial leaf waxes, and compared these results to a new record of temperature utilizing the TEX86 paleotemperature proxy, based on aquatic Thaumarchaeotal membrane lipids. In order to assess the impact of changing climate on the terrestrial environment, we generated a record of compound specific d13C from terrestrial leaf waxes, a proxy for ecosystem-level C3/C4 plant abundances, and compared the results to previously published pollen-inferred regional vegetation shifts. We observe a general coherence between temperature and rainfall, with a warm, wet interval peaking ~10-9 ka and subsequent gradual cooling and drying over the remainder of the Holocene. These results, particularly those of rainfall, are in general agreement with other tropical African climate records, indicating a somewhat consistent view of climate over a wide region of tropical East Africa. The d13C record from Lake Victoria leaf waxes does not appear to reflect changes in regional climate or vegetation. However, palynological analyses document an abrupt shift from a Poaceae (grasses)-dominated ecosystem during the cooler, arid late Pleistocene to a Moraceae-dominated (trees/shrubs) landscape during the warm, wet early Holocene. We theorize that these proxies are reflecting vegetation in different locations around Lake Victoria. Our results suggest a predominantly insolation-forced climate, with warm, wet conditions peaking at the maximum interhemispheric seasonal insolation contrast, likely intensifying monsoonal precipitation, while maximum aridity coincides with the rainy season insolation and the interhemispheric contrast gradient minima. We interpret a shift in conditions at the Younger Dryas to indicate a limited switch in insolation-dominated control on climate of the Lake Victoria region, to remote teleconnections with the coupled Atlantic and Pacific climate system.","author":{"name":"Melissa A. Berke, Thomas C. Johnson, Josef P. Werne, Kliti Grice, Stefan Schouten, Jaap S. Sinninghe Damsté"},"citation":"Melissa A. Berke, Thomas C. Johnson, Josef P. Werne, Kliti Grice, Stefan Schouten, Jaap S. Sinninghe Damsté. 2012. Molecular records of climate variability and vegetation response since the Late Pleistocene in the Lake Victoria basin, East Africa. Quaternary Science Reviews, 55, 59-74. doi: 10.1016/j.quascirev.2012.08.014","edition":null,"identifier":{"id":"10.1016/j.quascirev.2012.08.014","type":"doi","url":"http://dx.doi.org/10.1016/j.quascirev.2012.08.014"},"issue":null,"journal":"Quaternary Science Reviews","pages":"59-74","pubRank":"1","pubYear":2012,"reportNumber":null,"title":"Molecular records of climate variability and vegetation response since the Late Pleistocene in the Lake Victoria basin, East Africa","type":"publication","volume":"55"}],"reconstruction":"Y","scienceKeywords":["hydrology"],"site":[{"NOAASiteId":"55998","geo":{"geoType":"Feature","geometry":{"coordinates":["-1.2317","33.1983"],"type":"POINT"},"properties":{"easternmostLongitude":"33.1983","maxElevationMeters":"1133","minElevationMeters":"1133","northernmostLatitude":"-1.2317","southernmostLatitude":"-1.2317","westernmostLongitude":"33.1983"}},"locationName":"Continent>Africa>Eastern Africa>Lake Victoria","mappable":"Y","paleoData":[{"NOAADataTableId":"26790","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/victoria2012.txt","linkText":"Lake Victoria TEX86 and Leaf Wax dD and d13C Data","urlDescription":"Text Data File","variables":[{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Character","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":null,"cvWhat":"sampling metadata>notes"},{"cvAdditionalInfo":"based on leaf wax isotopes","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>isotope ratio>delta 13C","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"earth system variable>ecosystem variable>ecosystem quantity>C4 plants"},{"cvAdditionalInfo":"based on leaf wax isotopes","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":null,"cvError":"one standard deviation lower bound","cvFormat":"Numeric","cvMaterial":"reconstruction material>isotope ratio>delta 13C","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"earth system variable>ecosystem variable>ecosystem quantity>C4 plants"},{"cvAdditionalInfo":"based on leaf wax isotopes","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":null,"cvError":"one standard deviation upper bound","cvFormat":"Numeric","cvMaterial":"reconstruction material>isotope ratio>delta 13C","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"percent","cvWhat":"earth system variable>ecosystem variable>ecosystem quantity>C4 plants"},{"cvAdditionalInfo":"mean error of replicates","cvDataType":"PALEOLIMNOLOGY","cvDetail":"averaged","cvError":"unspecified margin of error","cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid>C29 n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|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":"geological material>bulk geological material>sediment","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":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>compound>organic compound>organic compound index>branched and isoprenoid tetraether index"},{"cvAdditionalInfo":null,"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":"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"},{"cvAdditionalInfo":"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":"mean error of replicates","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":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":"averaged","cvError":null,"cvFormat":"Numeric","cvMaterial":"chemical composition>compound>organic compound>organooxygen compound>fatty acid>n-alkanoic acid>C29 n-alkanoic acid","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"per mil VSMOW","cvWhat":"chemical composition>isotope>isotope ratio>delta 2H"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/victoria2012.xlsx","linkText":"Lake Victoria TEX86 and Leaf Wax dD and d13C Data","urlDescription":"Excel Data File","variables":[]}],"dataTableName":"Victoria2012TEX86","dataTableNotes":null,"earliestYear":15176,"earliestYearBP":15176,"earliestYearCE":-13226,"mostRecentYear":1372,"mostRecentYearBP":1372,"mostRecentYearCE":578,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Lake Victoria Core V95-1P"}],"studyCode":null,"studyName":"Lake Victoria, East Africa 15KYr 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 (C29 chain length). 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). \nIce volume correction column described in text. \nd13C n-alkane data was based on C29 chain length (most abundant, best chromatography). \nStandard deviation of replicates shown, as well as estimated C4 plant percentage (and 1 standard deviation \nfrom this estimation) as described in text and shown in figures. ","version":"1.0","xmlId":"14324"}