noaa-lake-16137 Venezuelan Andes 12,000 Year Proglacial Lake Sediment Data Stansell, N.D.; Polissar, P.J.; Abbott, M.B.; Bezada, M.; Steinman, B.; Braun, C. Venezuelan Andes 12,000 Year Proglacial Lake Sediment Data 2014-03-03 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16137 Investigator N.D. Stansell Investigator P.J. Polissar Investigator M.B. Abbott Investigator M. Bezada Investigator B. Steinman Investigator C. Braun earth science paleoclimate paleolimnology depth,null,null,centimeter,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology mineral matter,sediment,null,gram per square centimeter per year,null,paleolimnology,null,null,N,clastic flux earth science paleoclimate paleolimnology titanium,sediment,null,percent,null,paleolimnology,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology titanium,sediment,null,count per second,null,paleolimnology,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology biogenic silica,sediment,null,percent,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology organic matter,sediment,null,percent,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology iron,sediment,null,percent,null,paleolimnology,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology iron,sediment,null,count per second,null,paleolimnology,null,energy-dispersive x-ray fluorescence spectroscopy,N,null earth science paleoclimate paleolimnology mineral matter,sediment,null,gram per square centimeter per year,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology density,dry 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,null,N,x10-6 units earth science paleoclimate paleolimnology age,null,null,calendar year before present,null,paleolimnology,null,null,N,null earth science paleoclimate paleolimnology magnetic susceptibility earth science paleoclimate paleolimnology physical properties earth science paleoclimate paleolimnology geochemistry geoscientificInformation 12056 cal yr BP -38 cal yr BP Complete 8.512 8.797 -71.086 -70.828 3577 4050 Continent South America Venezuela Laguna de Los Anteojos>LATITUDE 8.5383>LONGITUDE -71.0737 Continent South America Venezuela Laguna de Montos>LATITUDE 8.512>LONGITUDE -71.086 Continent South America Venezuela Laguna de Mucubají>LATITUDE 8.797>LONGITUDE -70.828 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

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Boulder CO 80305-3328 USA online ASCII Nathan D. Stansell, Pratigya J. Polissar, Mark B. Abbott, Maximiliano Bezada, Byron A. Steinman, Carsten Braun 2014 Quaternary Science Reviews 89 44-55 10.1016/j.quascirev.2014.01.021 http://www.sciencedirect.com/science/article/pii/S0277379114000341

Lake sediment records from the Cordillera de Mérida in the northern Venezuelan Andes document the history of local glacial variability and climate changes during the Holocene (~12 ka to the present). The valleys that contain these lakes have similar bedrock compositions and hypsometries, but have different headwall elevations and aspects, which makes them useful for investigating the magnitude of past glaciations. There was widespread glacial retreat in the Venezuelan Andes during the early Holocene, after which most watersheds remained ice free, and thus far only valleys with headwalls higher than ~4400 m asl contain evidence of glaciation during the last ~10 ka. There was a pronounced shift in sediment composition for the Montos (headwall: ~4750 m asl) and Los Anteojos (headwall: ~4400 m asl) records during the middle Holocene from ~8.0 to 7.7 ka when conditions appear to have become ice free and drier. There is tentative evidence that the glacier in the Mucubají valley (headwall: ~4609 m asl) advanced from ~8.1 to 6.6 ka and then retreated during the latter stages of the middle Holocene. Clastic sediment accumulation in other nearby lake basins was either low or decreased throughout most of the middle Holocene as watersheds stabilized under warmer and/or drier conditions. In the Montos record, there was another major shift in sediment composition that occurred from ~6.5 to 5.7 ka, similar to other regional records that suggest conditions were drier during this period. Overall, the late Holocene was a period of warmer and wetter conditions with ice extent at a minimum in the northern tropical Andes. There were also punctuated decadal to multi-centennial periods of higher clastic sediment accumulation during the last ~4 ka, likely in response to periods of cooling and/or local precipitation changes. In watersheds with headwalls above 4600 m asl, there is evidence of glacial advances during the Little Ice Age (~0.6-0.1 ka). The pattern of glacial variability is generally similar in both the northern and southern tropics during the Little Ice Age, suggesting that ice margins in both regions were responding to colder and wetter conditions during the latest Holocene. The observed pattern of Holocene climate variability in the Venezuelan Andes cannot be explained by insolation forcing alone, and tropical ocean influences were likely associated with the observed glacial and lake level changes. STUDY NOTES: Lake sediment data from 3 lakes in the Cordillera de Mérida, northern Venezuelan Andes, interpreted as a local glacial variability history and climate change record.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/anteojos2014dbd.txt Data File; Laguna de Los Anteojos Dry Bulk Density GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/montos2014bio-si.txt Data File; Laguna de Montos Biogenic Silica GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/anteojos2014ms.txt Data File; Laguna de Los Anteojos Magnetic Susceptibility GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/anteojos2014bio-si.txt Data File; Laguna de Los Anteojos Biogenic Silica GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/montos2014dbd.txt Data File; Laguna de Montos Dry Bulk Density GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/anteojos2014ti-fe.txt Data File; Laguna de Los Anteojos Iron and Titanium GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/montos2014ms.txt Data File; Laguna de Montos Magnetic Susceptibility GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/mucubaji2014bio-si.txt Data File; Laguna de Mucubají Biogenic Silica GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/mucubaji2014dbd.txt Data File; Laguna de Mucubají Dry Bulk Density GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/southamerica/venezuela/mucubaji2014ms.txt Data File; Laguna de Mucubají Magnetic Susceptibility USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11