noaa-icecore-22251 Tropical Peruvian Ice Core 50 Year Oxygen Isotope Data Thompson, L.G.; Davis, M.E.; Mosley-Thompson, E.; Beaudon, E.; Porter, S.E.; Kutuzov, S.; Lin, P-N.; Mikhalenko, V.N.; Mountain, K. Tropical Peruvian Ice Core 50 Year Oxygen Isotope Data 2017-09-07 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22251 Investigator L.G. Thompson Investigator M.E. Davis Investigator E. Mosley-Thompson Investigator E. Beaudon Investigator S.E. Porter Investigator S. Kutuzov Investigator P-N. Lin Investigator V.N. Mikhalenko Investigator K. Mountain earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,HS1993d18O earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,HS2016d18O earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC1983d18Oann earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC1983d18 earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC1983d18 earth science paleoclimate ice cores density,bulk ice,null,kilogram per cubic meter,null,ice cores,null,null,N,QIC2003dens earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC1983deepd18O earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC1983deepDens earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC2016d18O earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,HS1993d18O earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC1983deepd18O earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC1991d18O earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC2003dens earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC1976d18O earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC1979d18O earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC1991d18O earth science paleoclimate ice cores age,null,null,year Common Era,null,ice cores,null,null,N,QIC2003d18Oann earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC2003d18O earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,HS1991d18O earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,HS1991d18O earth science paleoclimate ice cores age,null,null,year Common Era,null,ice cores,null,null,N,QIC1983d18Oann earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC2003d18O earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,QIC2003d18Oann earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC2016d18O earth science paleoclimate ice cores delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,isotope ratio mass spectrometry,N,HS2016d18O earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC1976d18O earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,QIC1979d18O earth science paleoclimate ice cores density,bulk ice,null,kilogram per cubic meter,null,ice cores,null,null,N,QIC1983deepDens earth science paleoclimate ice core oxygen isotopes geoscientificInformation 1974 AD 2016 AD -24 cal yr BP -66 cal yr BP Complete -13.93 -9 -77.5 -70.83 5670 6050 Continent South America Peru Nevado Huascarán>LATITUDE -9>LONGITUDE -77.5 Continent South America Peru Quelccaya Ice Cap>LATITUDE -13.93>LONGITUDE -70.83 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 L.G. Thompson, M.E. Davis, E. Mosley-Thompson, E. Beaudon, S.E. Porter, S. Kutuzov, P-N. Lin, V.N. Mikhalenko, K.R. Mountain 2017 Journal of Geophysical Research: Atmospheres 122 23 12688-12701 10.1002/2017JD026592 https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2017JD026592

Data collected between 1974 and 2016 from snow pits and core samples from two Peruvian ice fields demonstrate the effect of the recent warming over the tropical Andes, augmented by El Nino, on the preservation of the climate record. As the 0C isotherm is approaching the summit of the Quelccaya ice cap in the Andes of southern Peru (5,670 meters above sea level (masl)), the distinctive seasonal d18O oscillations in the fresh snow deposited within each thermal year are attenuated at depth due to melting and percolation through the firn. This has become increasingly pronounced over 43 years. In the Andes of northern Peru, the ice field on the col of Nevado Huascarán (6050 masl) has retained its seasonal d18O variations at depth due to its higher elevation. During the 2015/2016 El Nino, snow on Quelccaya and Huascarán was isotopically (d18O) enriched and the net sum of accumulation over the previous year (NSA) was below the mean for non-El Nino years, particularly on Quelccaya (up to 64% below the mean) which was more pronounced than the NSA decrease during the comparable 1982/1983 El Nino. Interannual large‐scale oceanic and middle to upper‐level atmospheric temperatures influence d18O in precipitation on both ice fields, although the influences are variably affected by strong El Nino–Southern Oscillation events, especially on Quelccaya. The rate of ice wastage along Quelccaya's margin was dramatically higher during 2015/2016 compared with that of the previous 15 years, suggesting that warming from future El Ninos may accelerate mass loss on Peruvian glaciers. STUDY NOTES: Ice core and snow pit oxygen isotope (d18O) data, at sub-annual resolution for recent decades, from two ice core locations in tropical Peru (Quelccaya and Huascarán), plus ice density and geochemical measurements made on some samples.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/ Data Folder; Quelccaya Ice Core and Snowpit d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/quelccaya2017.xlsx Excel Data File; Quelccaya and Huascarán Ice Core and Snowpit d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/huascaran/ Data Folder; Huascarán Ice Core and Snowpit d18O Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11