{"NOAAStudyId":"10428","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":"2010-05-17","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-10428.xml","doi":null,"earliestYearBP":1446,"earliestYearCE":504,"entryId":"noaa-lake-10428","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"EAR 0639474, ATM 0223920"}],"investigators":"Tierney, J.E.; Mayes, M.T.; Meyer, N.; Johnson, C.; Swarzenski, P.W.; Cohen, A.S.; Russell, J.M.","mostRecentYearBP":-6,"mostRecentYearCE":1956,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/10428","originalSource":null,"publication":[{"abstract":"Instrumental observations suggest that Lake Tanganyika, the largest \nrift lake in East Africa, has become warmer, increasingly stratified \nand less productive over the past 90 years.  These trends have been \nattributed to anthropogenic climate change. However, it remains \nunclear whether the decrease in productivity is linked to the \ntemperature rise, and whether the twentieth-century trends are \nanomalous within the context of longer-term variability. Here, \nwe use the TEX86 temperature proxy, the weight per cent of biogenic \nsilica and charcoal abundance from Lake Tanganyika sediment cores \nto reconstruct lake-surface temperature, productivity and regional \nwildfire frequency, respectively, for the past 1,500 years. \nWe detect a negative correlation between lake-surface temperature \nand primary productivity, and our estimates of fire frequency, \nand hence humidity, preclude decreased nutrient input through runoff \nas a cause for observed periods of low productivity.  We suggest that, \nthroughout the past 1,500 years, rising lake-surface temperatures \nincreased the stratification of the lake water column, preventing \nnutrient recharge from below and limiting primary productivity. \nOur records indicate that changes in the temperature of Lake \nTanganyika in the past few decades exceed previous natural variability. \nWe conclude that these unprecedented temperatures and a corresponding\ndecrease in productivity can be attributed to anthropogenic global \nwarming, with potentially important implications for the Lake \nTanganyika fishery.\n","author":null,"citation":"Tierney, J.E., M.T. Mayes, N. Meyer, C. Johnson, P.W. Swarzenski, \nA.S. Cohen, and J.M. Russell.  2010. \nLate-twentieth-century warming in Lake Tanganyika unprecedented \nsince AD 500. \nNature GeoScience, Published online 16 May 2010. \nDOI: 10.1038/NGEO865","edition":null,"identifier":{"id":"10.1038/NGEO865","type":"doi","url":"http://dx.doi.org/10.1038/NGEO865"},"issue":null,"journal":"Nature Geoscience","pages":null,"pubRank":"1","pubYear":2010,"reportNumber":null,"title":"Late-twentieth-century warming in Lake Tanganyika unprecedented  since AD 500","type":"publication","volume":null}],"reconstruction":"Y","scienceKeywords":["PAGES Africa 2k","PAGES 2k Network"],"site":[{"NOAASiteId":"9538","geo":{"geoType":"Feature","geometry":{"coordinates":["-6.03","28.53"],"type":"POINT"},"properties":{"easternmostLongitude":"28.53","maxElevationMeters":null,"minElevationMeters":null,"northernmostLatitude":"-6.03","southernmostLatitude":"-6.03","westernmostLongitude":"28.53"}},"locationName":"Continent>Africa>Eastern Africa>Lake Tanganyika","mappable":"Y","paleoData":[{"NOAADataTableId":"19226","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>reconstruction","earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/tanganyika2010.txt","linkText":"tanganyika2010.txt","urlDescription":"Data","variables":[{"cvAdditionalInfo":"TEX86","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"reconstruction material>organic compound index>glycerol dialkyl glycerol tetraether index","cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>lake water temperature>lake surface temperature"},{"cvAdditionalInfo":"TEX86","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":null,"cvError":"95% confidence interval lower bound","cvFormat":"Numeric","cvMaterial":"reconstruction material>organic compound index>glycerol dialkyl glycerol tetraether index","cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>lake water temperature>lake surface temperature"},{"cvAdditionalInfo":"TEX86","cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":null,"cvError":"95% confidence interval upper bound","cvFormat":"Numeric","cvMaterial":"reconstruction material>organic compound index>glycerol dialkyl glycerol tetraether index","cvMethod":null,"cvSeasonality":"annual","cvShortName":null,"cvUnit":"degree Celsius","cvWhat":"earth system variable>temperature variable>temperature>lake water temperature>lake surface temperature"},{"cvAdditionalInfo":null,"cvDataType":"CLIMATE RECONSTRUCTIONS|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"centimeter","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":"year Common Era","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":"weight percent","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":"normalized","cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"chemical composition>compound>inorganic compound>silicon dioxide>biogenic silica"},{"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":"charred sediment count per gram of dry sediment","cvDataType":"FIRE HISTORY|PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"count per gram","cvWhat":"biological material>bulk biological material>charcoal"},{"cvAdditionalInfo":"charred sediment count per gram of dry sediment","cvDataType":"FIRE HISTORY|PALEOLIMNOLOGY","cvDetail":"normalized","cvError":null,"cvFormat":"Numeric","cvMaterial":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"dimensionless","cvWhat":"biological material>bulk biological material>charcoal"}]},{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>reconstruction","earth science>paleoclimate>paleolimnology>geochemistry"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/eastafrica/tanganyika2010.xls","linkText":"tanganyika2010.xls","urlDescription":"Data","variables":[]}],"dataTableName":"NP04-KH1","dataTableNotes":null,"earliestYear":504,"earliestYearBP":1446,"earliestYearCE":504,"mostRecentYear":1956,"mostRecentYearBP":-6,"mostRecentYearCE":1956,"species":[],"timeUnit":"AD"}],"siteName":"Lake Tanganyika"}],"studyCode":null,"studyName":"Lake Tanganyika 1500 Year TEX86 LST, BSi, and Charcoal Data","studyNotes":"High resolution multiproxy data from Lake Tanganyika for the past 1500 \nyears.  Data include the TEX86 lake surface temperature proxy, weight \nper cent of biogenic silica as a productivity proxy, and charcoal abundance \nas an indicator of regional wildfire frequency.  \n\nData from piston Core NP04-KH1 and multicore MC1, Kalya Platform area,\nLake Tanganyika","version":"1.0","xmlId":"9092"}