noaa-lake-9952 Salar de Uyuni, Bolivia Drill Hole 50KYR Natural Gamma Radiation Baker, P.A.; Rigsby, C.A.; Seltzer, G.O.; Fritz, S.C.; Lowenstein, T.K.; Bacher, N.; Veliz, Y Salar de Uyuni, Bolivia Drill Hole 50KYR Natural Gamma Radiation 2010-08-26 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/9952 Investigator P.A. Baker Investigator C.A. Rigsby Investigator G.O. Seltzer Investigator S.C. Fritz Investigator T.K. Lowenstein Investigator N. Bacher Investigator Y Veliz earth science paleoclimate paleolimnology depth,null,null,meter,null,paleolimnology,corrected,null,N,null earth science paleoclimate paleolimnology depth,null,null,meter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology gamma radiation,sediment,null,count per second,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology physical properties geoscientificInformation PAGES 2k Network PAGES LOTRED SA2k hydrology 49959 cal yr BP 0 cal yr BP Complete -20.25 -20.25 -67.5 -67.5 3653 3653 Continent South America Bolivia Salar de Uyuni>LATITUDE -20.25>LONGITUDE -67.5 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 Baker, P.A., C.A. Rigsby, G.O. Seltzer, S.C. Fritz, T. Lowenstein, N. Bacher, and Y. Veliz. 2001. Tropical climate changes at millennial and orbital timescales revealed by deep drilling on the South American Altiplano. Nature 409: 698-701.

Tropical South America is one of the three main centres of the global, zonal overturning circulation of the equatorial atmosphere (generally termed the 'Walker' circulation). Although this area plays a key role in global climate cycles, little is known about South American climate history. Here we describe sediment cores and down-hole logging results of deep drilling in the Salar de Uyuni, on the Bolivian Altiplano, located in the tropical Andes. We demonstrate that during the past 50,000 years the Altiplano underwent important changes in effective moisture at both orbital (20,000-year) and millennial timescales. Long-duration wet periods, such as the Last Glacial Maximum marked in the drill core by continuous deposition of lacustrine sediments appear to have occurred in phase with summer insolation maxima produced by the Earth's precessional cycle. Short-duration, millennial events correlate well with North Atlantic cold events, including Heinrich events 1 and 2, as well as the Younger Dryas episode. At both millennial and orbital timescales, cold sea surface temperatures in the high-latitude North Atlantic were coeval with wet conditions in tropical South America, suggesting a common forcing. STUDY NOTES: Natural gamma radiation (counts per second) from a drill hole in the Salar de Uyuni, Bolivia, salt flat, used as a proxy for Lake Level over the past 50,000 years. Mud units contain abundant radiogenic K, U, and Th, whereas salt units are largely nonradioactive. Note: Adjusted depths match gamma log data with the equivalent depths in the sediment core - see Fritz et al. 2004 for additional information.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/salar-de-uyuni2001.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/salar-de-uyuni2001.xls USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11