Lake Titicaca 20-60KYrBP Biogenic Silica and Grain Size Data Fritz, S.C.; Baker, P.A.; Ekdahl, E.; Seltzer, G.O.; Stevens, L.R. Fritz, S.C. Baker, P.A. Ekdahl, E. Seltzer, G.O. Stevens, L.R. Glacial PAGES 2k Network PAGES LOTRED SA2k Tropics earth science/paleoclimate/paleolimnology (depth at sample end,null,null,meter,null,paleolimnology,composited,null,N,null) earth science/paleoclimate/paleolimnology (total saline diatoms,null,null,percent,null,paleolimnology,null,null,N,saline planktic) earth science/paleoclimate/paleolimnology (total benthic diatoms,null,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (depth at sample start,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (depth at sample start,null,null,meter,null,paleolimnology,composited,null,N,null) earth science/paleoclimate/paleolimnology (total freshwater diatoms,null,null,percent,null,paleolimnology,null,null,N,freshwater planktic) earth science/paleoclimate/paleolimnology (grain size mean,sediment,null,micrometer,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (depth at sample end,null,null,meter,null,paleolimnology,corrected,null,N,null) earth science/paleoclimate/paleolimnology (depth at sample end,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (depth at sample start,null,null,meter,null,paleolimnology,corrected,null,N,null) earth science/paleoclimate/paleolimnology (delta 13C,organic matter,null,per mil PDB,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (total planktic diatoms,null,null,percent,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 earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Lake Titicaca Core LT01-2B>LATITUDE -15.93>LONGITUDE -69.25) Millennial-scale climate variation during the Last Glacial period is evident in many locations worldwide, but it is unclear if such variation occurred in the interior of tropical South America, and, if so, how the low-latitude variation was related to its high-latitude counterpart. A high-resolution record, derived from the deep drilling of sediments on the floor of Lake Titicaca in the southern tropical Andes, is presented that shows clear evidence of millennial-scale climate variation between ~60 and 20 ka BP. This variation is manifested by alternations of two interbedded sedimentary units. The two units have distinctive sedimentary, geochemical, and paleobiotic properties that are controlled by the relative abundance of terrigenous or nearshore components versus pelagic components. The sediments of more terrigenous or nearshore nature likely were deposited during regionally wetter climates when river transport of water and sediment was higher, whereas the sediments of more pelagic character were deposited during somewhat drier climates regionally. The majority of the wet periods inferred from the Lake Titicaca sediment record are correlated with the cold events in the Greenland ice cores and North Atlantic sediment cores, indicating that increased intensity of the South American summer monsoon was part of near-global scale climate excursions. STUDY NOTES: Biogenic silica, grain size, and diatom data from 136m long sediment core LT01-2B, Lake Titicaca, Bolivia/Peru, drilled in April and May 2001, covering ~60 - 20 KYrBP. d13C data is from P.A. Baker, diatom and BiSiO2 data is from S.C. Fritz, and grain size data from G.O. Seltzer. Additional information on the LT01-2B drill cores, age model development, and additional core data are included with Fritz et al. 2007 Lake Titicaca data set: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2007.txt NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Fritz, S.C. Investigator : Baker, P.A. Investigator : Ekdahl, E. Investigator : Seltzer, G.O. Investigator : Stevens, L.R. 2010-08-25 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/9950 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2010.xls English https://www.ncdc.noaa.gov/paleo/study/9950 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/bolivia/titicaca2010.xls Fritz, S.C., P.A. Baker, E. Ekdahl, G.O. Seltzer, and L.R. Stevens. 2010. Millennial-scale climate variability during the last glacial period in the tropical Andes. Quaternary Science Reviews, Vol. 29, pp. 1017-1024. doi:10.1016/j.quascirev.2010.01.001 START YEAR: 59891 cal yr BP * END YEAR: 10034 cal yr BP -69.25 -15.93 -69.25 -15.93