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. Bird, B.W. Rudloff, O. Escobar, J. Gilhooly, W.P. Correa-Metrio, A. Vélez, M. Polissar, P.J. 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 earth science/paleoclimate/paleolimnology (Laguna de Ubaque>LATITUDE 4.499>LONGITUDE -73.935) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Bird, B.W. Investigator : Rudloff, O. Investigator : Escobar, J. Investigator : Gilhooly, W.P. Investigator : Correa-Metrio, A. Investigator : Vélez, M. Investigator : Polissar, P.J. 2017-07-25 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/22275 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017geochem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017gs.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017geochem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017gs.txt English https://www.ncdc.noaa.gov/paleo/study/22275 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017geochem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017.xlsx https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/colombia/ubaque2017gs.txt Broxton W. Bird, Owen Rudloff, Jaime Escobar, William P. Gilhooly III, Alex Correa-Metrio, Maria Vélez, Pratigya J. Polissar2017Paleoclimate support for a persistent dry island effect in the Colombian Andes during the last 4700 yearsThe Holocene10.1177/0959683617721 START YEAR: 4653 cal yr BP * END YEAR: -65 cal yr BP -73.935 4.499 -73.935 4.499