Dunde Ice Core 1500 Year d18O, Dust, Anion, and Accumulation Data Thompson, L.G.; Mosley-Thompson, E.; Brecher, H.H.; Davis, M.E.; Leon, B.; Les, D.; Lin, P-N.; Mashiotta, T.A.; Mountain, K. Thompson, L.G. Mosley-Thompson, E. Brecher, H.H. Davis, M.E. Leon, B. Les, D. Lin, P-N. Mashiotta, T.A. Mountain, K. abrupt climate change earth science/paleoclimate/ice cores (accumulation rate,bulk ice,null,meter,null,ice cores,null,null,N,water equivalent) earth science/paleoclimate/ice cores (sulfate,bulk ice,null,parts per billion,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (dust,bulk ice,null,count per milliliter,null,ice cores,null,null,N,2.00-60 um) earth science/paleoclimate/ice cores (ice age at sample end,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (chloride,bulk ice,null,parts per billion,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (nitrate,bulk ice,null,parts per billion,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (ice age at sample start,null,null,year Common Era,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (delta 18O,bulk ice,null,per mil SMOW,null,ice cores,null,null,N,null) earth science/paleoclimate/ice cores (dust,bulk ice,null,count per milliliter,null,ice cores,null,null,N,0.63-16um) earth science/paleoclimate/ice core earth science/paleoclimate/ice core earth science/paleoclimate/ice core (Dunde Ice Cap>LATITUDE 38.1>LONGITUDE 96.4) Three lines of evidence for abrupt tropical climate change, both past and present, are presented. First, annually and decadally averaged d18O and net mass-balance histories for the last 400 and 2,000 yr, respectively, demonstrate that the current warming at high elevations in the mid- to low latitudes is unprecedented for at least the last 2 millennia. Second, the continuing retreat of most mid- to low-latitude glaciers, many having persisted for thousands of years, signals a recent and abrupt change in the Earth’s climate system. Finally, rooted, soft-bodied wetland plants, now exposed along the margins as the Quelccaya ice cap (Peru) retreats, have been radiocarbon dated and, when coupled with other widespread proxy evidence, provide strong evidence for an abrupt mid-Holocene climate event that marked the transition from early Holocene (pre-5,000-yr-B.P.) conditions to cooler, late Holocene (post-5,000-yr-B.P.) conditions. This abrupt event, ~5,200 yr ago, was widespread and spatially coherent through much of the tropics and was coincident with structural changes in several civilizations. These three lines of evidence argue that the present warming and associated glacier retreat are unprecedented in some areas for at least 5,200 yr. The ongoing global-scale, rapid retreat of mountain glaciers is not only contributing to global sea-level rise but also threatening freshwater supplies in many of the world’s most populous regions. STUDY NOTES: Dunde ice core oxygen isotopes, dust, major anions (chloride, nitrate, sulfate), decadal averages from ~500 A.D.-1987 A.D. Five year averages of net balance (accumulation) in water equivalent from 1606 to 1984 A.D. Note: The Core 3 decadal averages of dust and major ions (chloride, nitrate and sulfate) have not been published, but are included here. core location: Dunde Ice Cap, NE Tibetan Plateau: 38°06'N, 96°24'E, 5325 masl NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Thompson, L.G. Investigator : Mosley-Thompson, E. Investigator : Brecher, H.H. Investigator : Davis, M.E. Investigator : Leon, B. Investigator : Les, D. Investigator : Lin, P-N. Investigator : Mashiotta, T.A. Investigator : Mountain, K. 2012-05-21 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/12942 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/dunde/dunde2006.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/dunde/dunde2006.xls https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/dunde/dunde2006.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/dunde/dunde2006.xls English https://www.ncdc.noaa.gov/paleo/study/12942 https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/dunde/dunde2006.txt https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/trop/dunde/dunde2006.xls Thompson, L.G., E. Mosley-Thompson, H. Brecher, M. Davis, B. Leon, D. Les, P.-N. Lin, T. Mashiotta, and K. Mountain. 2006. Abrupt tropical climate change: Past and present. Proceedings of the National Academy of Sciences, Vol. 103, No. 28, pp. 10536-10543, 11 July, 2006. DOI: 10.1073/pnas.0603900103 START YEAR: 520 AD * END YEAR: 1980 AD 96.4 38.1 96.4 38.1