Quelccaya Ice Cap - Particle, d18O, and Accumulation Data Thompson, L.G.; Mosley-Thompson, E.; Grootes, P.M.; Pourchet, M. Thompson, L.G. Mosley-Thompson, E. Grootes, P.M. Pourchet, M. PAGES 2k Network PAGES LOTRED SA2k earth science/paleoclimate/ice cores (ice age,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (particles,bulk ice,null,count per milliliter,null,ice cores,null,electric sensing particle size analysis,N,>1.59 micrometers) earth science/paleoclimate/ice cores (electrical conductivity,bulk ice,null,microsiemens per centimeter,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,standard deviation unit,null,ice cores,normalized,null,N,null) earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter per year,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (particles,bulk ice,null,count per milliliter,null,ice cores,null,electric sensing particle size analysis,N,>0.63 micrometers) earth science/paleoclimate/ice cores (particles,bulk ice,null,count per milliliter,null,ice cores,null,electric sensing particle size analysis,N,0.63-0.80 micrometers) earth science/paleoclimate/ice cores (delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,null,N,null) earth science/paleoclimate/ice core earth science/paleoclimate/ice core earth science/paleoclimate/ice core (Quelccaya Ice Cap>LATITUDE -13.93>LONGITUDE -70.83) The objective of this work is to evaluate the potential of tropical glaciers and ice caps for the reconstruction of past climatic conditions by the analysis of firn and ice cores. Samples were collected in pits and from cores retrieved on three snow fields in the South American Andes: Quelccaya Ice Cap and Huascarán in Peru and Chimborazo in Ecuador. These are compared with results from west Africa and Indonesia. Measurements include the microparticle concentration, oxygen isotopic abundance ratios, and total beta radioactivity, which in polar regions often exhibit seasonal depositional cycles. Annual variations in these three parameters are fairly well defined on Quelccaya and Huascarán and are apparently absent on Chimborazo. The Quelccaya Ice Cap contains the best preserved annual signal for all three parameters and, although in some instances the annual cycle is difficult to distinguish, the measurement of more than one stratigraphic parameter aids in the interpretation of the firn core records. The relatively flat bottom topography under Quelccaya suggests a simple ice flow regime, and depth-age calculations indicate that an ice core to bedrock should contain a record of 600 to 1300 years. This inference was confirmed by drilling to bedrock in 1983. This investigation of tropical glaciers indicates that the Quelccaya Ice Cap on the eastern edge of the Peruvian Andes has excellent potential to contain a lengthy and interpretable record of climatic conditions within the tropics of South America. STUDY NOTES: Additional References: Thompson, L.G., E. Mosley-Thompson and Benjamin Morales Arnao. 1984. Major El Nino/Southern Oscillation events recorded in stratigraphy of the tropical Quelccaya Ice Cap. Science, 226 (4670), 50-52. Thompson, L. G., E. Mosley-Thompson, J. F. Bolzan and B. R. Koci. 1985. A 1500 year record of tropical precipitation recorded in ice cores from the Quelccaya Ice Cap, Peru. Science, 229(4717), 971-973 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Thompson, L.G. Investigator : Mosley-Thompson, E. Investigator : Grootes, P.M. Investigator : Pourchet, M. 1993-12-09 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/2435 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/readme_quelccaya.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/q83summ.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/fieldcon.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/quelccaya1992.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/q83cor1.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/readme_quelccaya.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/q83summ.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/fieldcon.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/quelccaya1992.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/q83cor1.txt English https://www.ncdc.noaa.gov/paleo/study/2435 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/readme_quelccaya.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/q83summ.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/fieldcon.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/quelccaya1992.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/quelccaya/q83cor1.txt L. G. Thompson, E. Mosley-Thompson, P. M. Grootes, M. Pourchet, S. Hastenrath1984Tropical glaciers: Potential for ice core paleoclimatic reconstructionsJournal of Geophysical Research: Atmospheres89D34638-464610.1029/JD089iD03p04638http://onlinelibrary.wiley.com/enhanced/doi/10.1029/JD089iD03p04638/ START YEAR: 470 AD * END YEAR: 1984 AD -70.83 -13.93 -70.83 -13.93