noaa-icecore-17800 GISP2 Ice Core 40KYr 10Be Data Finkel, R.C.; Nishiizumi, K. GISP2 Ice Core 40KYr 10Be Data 1997-11-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17800 Investigator R.C. Finkel Investigator K. Nishiizumi earth science paleoclimate ice cores depth at sample start,null,null,meter,null,ice cores,null,null,N,null earth science paleoclimate ice cores depth at sample end,null,null,meter,null,ice cores,null,null,N,null earth science paleoclimate ice cores 10Be,bulk ice,null,count per gram,null,ice cores,null,accelerator mass spectrometry,N,x1e3 atom per gram earth science paleoclimate ice cores ice age at sample end,null,null,calendar year before present,null,ice cores,null,null,N,null earth science paleoclimate ice cores 10Be,bulk ice,unspecified margin of error,count per gram,null,ice cores,null,accelerator mass spectrometry,N,x1e3 atom per gram earth science paleoclimate ice core radiogenic isotopes geoscientificInformation 40056 cal yr BP 3308 cal yr BP Complete 72.6 72.6 -38.5 -38.5 3200 3200 Continent North America Greenland GISP2>LATITUDE 72.6>LONGITUDE -38.5 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 R. C. Finkel and K. Nishiizumi 1997 Journal of Geophysical Research: Oceans 102 C12 26699-26706 10.1029/97JC01282 http://onlinelibrary.wiley.com/enhanced/doi/10.1029/97JC01282/

A nearly continuous record of 10Be (half-life of 1.5x10e6 years) concentrations is reported in the Greenland Ice Sheet Project 2 (GISP2) ice core for the time period between 3288 and 40,055 years B.P. The resolution is between 20 and 50 years in the Holocene. During the Pleistocene, sampling was coarser, with the resolution ranging between 50 and 200 years. Both concentrations and fluxes are reported. Concentrations of 10Be are observed to correlate strongly with d18O and more weakly with snow accumulation rates. Beryllium 10 fluxes show less dependence than do concentrations on climate-related parameters. A good correlation exists between D14C and 10Be for centennial scale variations, which are most likely due to heliomagnetic modulation of the 10Be production rate in the atmosphere. There is no evidence of a long-term geomagnetic effect on the 10Be flux at GISP2. The interpretation of the record depends strongly on the model one uses to infer atmospheric 10Be concentrations from the measured concentrations in snow. STUDY NOTES: Melted water was collected from the outside of samples taken for cation and anion analysis by the UNH group. A small aliquot was taken for anion analysis (chloride, nitrate, and sulfate) and the remainder was weakly acidified with HNO3 to yield a final pH of about 2. Be, Cl and Al carriers were then added. The Be (and Al and Cl) were concentrated from the melted ice using ion exchange resins. Be was then eluted from the cation exchange column, precipitated as Be(OH)2 and ignited to BeO for accelerator mass spectrometry (AMS) measurement. The AMS measurements were carried out at the Lawrence Livermore National Laboratory Center for Accelerator Mass Spectrometry (Davis et al., 1990). The 10Be (half-life = 1.5 x 10^6 years) concentration was normalized to an ICN standard (diluted by K. Nishiizumi) after carrier blank and boron background correction.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/gisp2/cosmoiso/ber10.txt Data File; GISP2 10Be concentration 719 - 2253 m USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11