Laguna de Los Anteojos, Venezuela Younger Dryas Sediment Data Stansell, N.D.; Abbott, M.B.; Rull, V.; Rodbell, D.; Bezada, M.; Montoya, E. Stansell, N.D. Abbott, M.B. Rull, V. Rodbell, D. Bezada, M. Montoya, E. PAGES 2k Network PAGES LOTRED SA2k Younger Dryas abrupt climate change earth science/paleoclimate/paleolimnology (carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,weight percent,null,paleolimnology,smoothed,spectrophotometry,N,smoothed using lowess 0.01) earth science/paleoclimate/paleolimnology (density,sediment,null,gram per cubic centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (volume magnetic susceptibility,sediment,null,dimensionless (SI system),null,paleolimnology,null,magnetic susceptibility measurement with point or surface sensor,N,x10-6 units) earth science/paleoclimate/paleolimnology (titanium,sediment,null,count per second,null,paleolimnology,null,x-ray fluorescence spectroscopy,N,null) earth science/paleoclimate/paleolimnology (biogenic silica,sediment,null,weight percent,null,paleolimnology,null,spectrophotometry,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (titanium,sediment,null,count per second,null,paleolimnology,smoothed,x-ray fluorescence spectroscopy,N,smoothed using lowess 0.01) earth science/paleoclimate/paleolimnology (mineral matter,sediment,null,weight percent,null,paleolimnology,null,null,N,calculated as 100% minus organic matter minus Biogenic silica) earth science/paleoclimate/paleolimnology (organic matter,sediment,null,weight percent,null,paleolimnology,null,loss on ignition,N,550 degrees C) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Laguna de Los Anteojos>LATITUDE 8.5383>LONGITUDE -71.0737) A radiocarbon dated sediment record from Laguna de Los Anteojos, a cirque lake in the Mérida Andes of Venezuela, indicates that warmer and wetter atmospheric conditions occurred in the northern tropics at the onset of the Bølling (~14,600 cal yr BP), and abruptly colder and drier conditions around the time of the Younger Dryas (YD). Geochemical and clastic sediment analyses from Los Anteojos show that glaciers advanced at ~12,850 cal yr BP, reached their YD maximum extent at ~12,650 cal yr BP, and then retreated until complete deglaciation of the watershed at ~11,750 cal yr BP. The onset of warmer conditions that ended the coldest phase of the YD occurred several hundred years earlier at Los Anteojos than in the high latitudes of the Northern Hemisphere. During the peak YD glacial advance, glacier equilibrium-line altitudes in the region were ~360 to 480 m lower, and temperature was ~2.2 to 2.9°C colder than modern. Independent palynological evidence from the Los Anteojos sediment core indicates that the northern Andes were more arid and at least 2.3°C colder during the YD. The direction and timing of glacial fluctuations in Venezuela are consistent with observations of marine sediment records from the Cariaco Basin that suggest abrupt cooling occurred at ~12,850 cal yr BP, followed by a shift to higher temperature after ~12,300 cal yr BP. The timing and pattern of climatic changes in northern South America are also consistent with paleoclimate records from the southern Tropical Andes that suggest a southward shift in the position of the Intertropical Convergence Zone occurred at the start of the cooling event, followed by a return to wetter conditions in northern South America during the late stages of the YD. The early warming of the tropical atmosphere and invigoration of the hydrologic cycle likely contributed to the shift to increased temperature in the higher latitudes of the Northern Hemisphere at the end of the late glacial stage. STUDY NOTES: Multiproxy lake sediment data from Laguna de Los Anteojos in the Mérida Andes of Venezuela, covering the Younger Dryas climate event. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Stansell, N.D. Investigator : Abbott, M.B. Investigator : Rull, V. Investigator : Rodbell, D. Investigator : Bezada, M. Investigator : Montoya, E. 2010-04-24 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/10434 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/los-anteojos2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/los-anteojos2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/los-anteojos2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/los-anteojos2010.txt English https://www.ncdc.noaa.gov/paleo/study/10434 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/los-anteojos2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/los-anteojos2010.txt Stansell, N.D., M.B. Abbott, V. Rull, D.T. Rodbell, M. Bezada, and E. Montoya. 2010. Abrupt Younger Dryas cooling in the northern tropics recorded in lake sediments from the Venezuelan Andes. Earth and Planetary Science Letters, Vol. 293, pp. 154-163. doi:10.1016/j.epsl.2010.02.040 START YEAR: 14737 cal yr BP * END YEAR: 9501 cal yr BP -71.0737 8.5383 -71.0737 8.5383