noaa-lake-5486 Salar de Uyuni 170KYR Drill Hole Natural Gamma Radiation Data Fritz, S.C.; Baker, P.A.; Seltzer, G.O.; Lowenstein, T.K.; Rigsby, C.A. Salar de Uyuni 170KYR Drill Hole Natural Gamma Radiation Data 2004-07-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/5486 Investigator S.C. Fritz Investigator P.A. Baker Investigator G.O. Seltzer Investigator T.K. Lowenstein Investigator C.A. Rigsby 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 kiloyear before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology physical properties geoscientificInformation PAGES 2k Network PAGES LOTRED SA2k 177124 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII 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 Quaternary Research 61 1 95-104 10.1016/j.yqres.2003.08.007 http://www.sciencedirect.com/science/article/pii/S0033589403001327

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 influence of insolation forcing on regional moisture budgets may have been stronger during the past 50,000 years than in earlier times. STUDY NOTES: 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.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/salar_de_uyuni_2004.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11