noaa-lake-22275 Laguna de Ubaque, Colombia 4,700 Year Sediment Geochemical Data Bird, B.W.; Rudloff, O.; Escobar, J.; Gilhooly, W.P.; Correa-Metrio, A.; Vélez, M.; Polissar, P.J. Laguna de Ubaque, Colombia 4,700 Year Sediment Geochemical Data 2017-07-25 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22275 Investigator B.W. Bird Investigator O. Rudloff Investigator J. Escobar Investigator W.P. Gilhooly Investigator A. Correa-Metrio Investigator M. Vélez Investigator P.J. Polissar earth science paleoclimate paleolimnology carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,Organic carbon to nitrogen ratio earth science paleoclimate paleolimnology delta 15N,sediment,null,per mil AIR,null,paleolimnology,null,elemental analysis|isotope ratio mass spectrometry,N,total nitrogen earth science paleoclimate paleolimnology clay,sediment,null,percent,null,paleolimnology,null,laser particle size analysis,N,null earth science paleoclimate paleolimnology grain size class,sediment,null,micrometer,null,paleolimnology,null,laser particle size analysis,N,50% of grains smaller than given particle diameter earth science paleoclimate paleolimnology sand,sediment,null,percent,null,paleolimnology,null,laser particle size analysis,N,null earth science paleoclimate paleolimnology longitude,null,null,degree east,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology grain size class,sediment,null,micrometer,null,paleolimnology,null,laser particle size analysis,N,10% of grains smaller than given particle diameter earth science paleoclimate paleolimnology grain size class,sediment,null,micrometer,null,paleolimnology,null,laser particle size analysis,N,90% of grains smaller than given particle diameter earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,Depth below 2013 sediment water interface earth science paleoclimate paleolimnology mineral matter,sediment,null,percent,null,paleolimnology,null,null,N,lithics; dry sediment minus organic matter minus biogenic silica minus carbonates earth science paleoclimate paleolimnology delta 13C,organic matter,null,per mil PDB,null,paleolimnology,null,elemental analysis|isotope ratio mass spectrometry,N,null earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,Sediment age from Bechron age model earth science paleoclimate paleolimnology organic matter,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,550 degrees C for 4 hours earth science paleoclimate paleolimnology calcium carbonate,sediment,null,percent,null,paleolimnology,null,loss on ignition,N,1000 degrees C for 2 hours earth science paleoclimate paleolimnology silt,sediment,null,percent,null,paleolimnology,null,laser particle size analysis,N,null earth science paleoclimate paleolimnology collection water depth,null,null,meter,null,paleolimnology,null,null,N,Depth from lake surface to sediment-water interface earth science paleoclimate paleolimnology sample identification,null,null,null,null,paleolimnology,null,null,N,Transect sample ID number earth science paleoclimate paleolimnology density,dry sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,Dry bulk density earth science paleoclimate paleolimnology latitude,null,null,degree north,null,paleolimnology,null,null,N,null earth science paleoclimate fire history|paleolimnology charcoal,sediment,null,square millimeter per milliliter,null,fire history|paleolimnology,null,null,N,charcoal abundance earth science paleoclimate paleolimnology physical properties earth science paleoclimate paleolimnology geochemistry geoscientificInformation 4653 cal yr BP -65 cal yr BP Complete 4.499 4.499 -73.935 -73.935 2070 2070 Continent South America Colombia Laguna de Ubaque>LATITUDE 4.499>LONGITUDE -73.935 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 Broxton W. Bird, Owen Rudloff, Jaime Escobar, William P. Gilhooly III, Alex Correa-Metrio, Maria Vélez, Pratigya J. Polissar 2017 The Holocene 10.1177/0959683617721

We investigated middle and late Holocene hydroclimate patterns in the Colombian Andes using indicators of watershed erosion (lithic abundance), precipitation intensity (% silt), lake-level variability (organic carbon and nitrogen, % sand, and diatoms), and fire frequency (fossil charcoal) from a ~4700-year-long sediment archive from Laguna de Ubaque, a small sub-alpine lake on the eastern flank of the eastern Colombian Andes. Our results indicate reduced precipitation, low lake levels and increased fire occurrence at Ubaque between 4700 and 3500 cal yr BP (hereafter BP). Precipitation increased and lake levels rose abruptly while fire occurrence decreased between 3500 and 2100 BP, with the exception of a 300-year dry phase between 2800 and 2500 BP. Although wetter than the 4700-3500 BP interval, precipitation decreased, lake levels fell, and fire occurrence increased after 2100 BP, but with high-frequency variability. Comparison of the Ubaque results with other Colombian paleoclimate records (e.g., Lakes Fúquene and La Cocha) supports an antiphase pattern of precipitation between the high/interior Andes and frontal slope sites. This spatial pattern of variability is consistent with modern responses to changes in terrestrial atmospheric convection associated with the so-called “dry island” effect. Further comparison with paleoclimate records from Venezuela suggest that the millennial trend toward increasing frontal slope precipitation is consistent with orbitally induced increases in Andean atmospheric convection. Sub-orbital dry island-like hydroclimate variability suggests other mechanisms that affect Northern Hemisphere convection may act to enhance or diminish this effect on centennial and shorter timescales. STUDY NOTES: Sediment geochemical and physical properties data from Laguna de Ubaque, Colombia for the past 4,700 years

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017geochem.txt Formatted Text Data File; Laguna de Ubaque Geochemical Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017.xlsx Excel Data File; Laguna de Ubaque All Data - Grain Size and Geochemical GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017gs.txt Formatted Text Data File; Laguna de Ubaque Modern Transect Grain Size Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11