{"NOAAStudyId":"5486","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":"2004-07-01","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-5486.xml","doi":null,"earliestYearBP":177124,"earliestYearCE":-175174,"entryId":"noaa-lake-5486","funding":[],"investigators":"Fritz, S.C.; Baker, P.A.; Seltzer, G.O.; Lowenstein, T.K.; Rigsby, C.A.","mostRecentYearBP":0,"mostRecentYearCE":1950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/5486","originalSource":null,"publication":[{"abstract":"Despite the hypothesized importance of the tropics in the global climate system, few tropical paleoclimatic records extend to periods earlier than the last glacial maximum (LGM), about 20,000 years before present. We present a well-dated 170,000-year time series of hydrologic variation from the southern hemisphere tropics of South America that extends from modern times through most of the penultimate glacial period. Alternating mud and salt units in a core from Salar de Uyuni, Bolivia reflect alternations between wet and dry periods. The most striking feature of the sequence is that the duration of paleolakes increased in the late Quaternary. This change may reflect increased precipitation, geomorphic or tectonic processes that affected basin hydrology, or some combination of both. The dominance of salt between 170,000 and 140,000 yr ago indicates that much of the penultimate glacial period was dry, in contrast to wet conditions in the LGM. Our analyses also suggest that the relative \r\ninfluence of insolation forcing on regional moisture budgets may have been stronger during the past 50,000 years than in earlier times. ","author":{"name":"Sherilyn C Fritz, Paul A Baker, Tim K Lowenstein, Geoffrey O Seltzer, Catherine A Rigsby, Gary S Dwyer, Pedro M Tapia, Kimberly K Arnold, Teh-Lung Ku, Shangde Luo"},"citation":"Sherilyn C Fritz, Paul A Baker, Tim K Lowenstein, Geoffrey O Seltzer, Catherine A Rigsby, Gary S Dwyer, Pedro M Tapia, Kimberly K Arnold, Teh-Lung Ku, Shangde Luo. 2004. Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America. Quaternary Research, 61(1), 95-104. doi: 10.1016/j.yqres.2003.08.007","edition":null,"identifier":{"id":"10.1016/j.yqres.2003.08.007","type":"doi","url":"http://dx.doi.org/10.1016/j.yqres.2003.08.007"},"issue":"1","journal":"Quaternary Research","pages":"95-104","pubRank":"1","pubYear":2004,"reportNumber":null,"title":"Hydrologic variation during the last 170,000 years in the southern hemisphere tropics of South America","type":"publication","volume":"61"}],"reconstruction":"N","scienceKeywords":["PAGES LOTRED SA2k","PAGES 2k Network"],"site":[{"NOAASiteId":"8965","geo":{"geoType":"Feature","geometry":{"coordinates":["-20.25","-67.5"],"type":"POINT"},"properties":{"easternmostLongitude":"-67.5","maxElevationMeters":"3653","minElevationMeters":"3653","northernmostLatitude":"-20.25","southernmostLatitude":"-20.25","westernmostLongitude":"-67.5"}},"locationName":"Continent>South America>Bolivia","mappable":"Y","paleoData":[{"NOAADataTableId":"7285","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth science>paleoclimate>paleolimnology>physical properties"],"fileUrl":"https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/salar_de_uyuni_2004.txt","linkText":"salar_de_uyuni_2004.txt","urlDescription":"Data","variables":[{"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":"geological material>bulk geological material>sediment","cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"count per second","cvWhat":"electromagnetic property>gamma radiation"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":null,"cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"calendar kiloyear before present","cvWhat":"age variable>age"},{"cvAdditionalInfo":null,"cvDataType":"PALEOLIMNOLOGY","cvDetail":"corrected","cvError":null,"cvFormat":"Numeric","cvMaterial":null,"cvMethod":null,"cvSeasonality":null,"cvShortName":null,"cvUnit":"meter","cvWhat":"depth variable>depth"}]}],"dataTableName":"Salar de Uyuni Core UYUNI","dataTableNotes":null,"earliestYear":177124,"earliestYearBP":177124,"earliestYearCE":-175174,"mostRecentYear":0,"mostRecentYearBP":0,"mostRecentYearCE":1950,"species":[],"timeUnit":"cal yr BP"}],"siteName":"Salar de Uyuni"}],"studyCode":null,"studyName":"Salar de Uyuni 170KYR Drill Hole Natural Gamma Radiation Data","studyNotes":"188 m. cased drill hole from Salar de Uyuni salt flat, Bolivian Altiplano.  Natural gamma radiation (counts per second), used as a proxy for sediment mud/salt content and therefore playa lake level. Mud units contain abundant radiogenic K, U, and Th, whereas salt units are largely nonradioactive.","version":"1.0","xmlId":"685"}