noaa-icecore-17842 GRIP Ice Core 248 KYr H2O2, HCHO, NH4+ and Ca2+ Data Fuhrer, K.; Neftel, A.; Anklin, M.; Maggi, V. GRIP Ice Core 248 KYr H2O2, HCHO, NH4+ and Ca2+ Data 1997-11-30 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/17842 Investigator K. Fuhrer Investigator A. Neftel Investigator M. Anklin Investigator V. Maggi earth science paleoclimate ice cores calcium,bulk ice,null,parts per billion,null,ice cores,null,continuous flow analysis,N,null earth science paleoclimate ice cores ice age,null,null,calendar year before present,null,ice cores,null,null,N,null earth science paleoclimate ice cores depth,null,null,meter,null,ice cores,null,null,N,null earth science paleoclimate ice cores formaldehyde,bulk ice,null,parts per billion,null,ice cores,null,continuous flow analysis,N,null earth science paleoclimate ice cores ammonium,bulk ice,null,parts per billion,null,ice cores,null,continuous flow analysis,N,ppb by weight earth science paleoclimate ice cores hydrogen peroxide,bulk ice,null,parts per billion,null,ice cores,null,continuous flow analysis,N,null earth science paleoclimate ice core chemistry geoscientificInformation 248190 cal yr BP 307 cal yr BP Complete 72.58 72.58 -37.63 -37.63 Continent North America Greenland GRIP>LATITUDE 72.58>LONGITUDE -37.63 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 Katrin Fuhrer, Albrecht Neftel, Martin Anklin, Valter Maggi 1993 Atmospheric Environment 27 12 1873-1880 10.1016/0960-1686(93)90292-7 http://www.sciencedirect.com/science/article/pii/0960168693902927

A new deep core drilling operation started in 1990 central Greenland and in 1992 reached the bottom at a depth of 3028 m.b. surface. Taking advantage of recent developments in the analytical technique of chemical trace species, continuous high resolution measurements of H2O2, HCHO, NH4+ and Ca2+ concentrations were performed directly on the ice core in the field. During the 1991 season all four components were measured simultaneously between 1300 m.b. surface and 2300 m.b. surface, corresponding to the time interval between 8000 and 38,000 years B.P. In this paper an overview of the results and our first interpretations in terms of climatic changes are given. STUDY NOTES: A continuous melting technique, combined with continuous flow analysis, has been utilized for measurements of chemical trace species H2O2, HCHO, NH4+ and Ca2+.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/chem/hcho.txt Data File; GRIP Formaldehyde Concentrations GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/chem/h2o2.txt Data File; GRIP Hydrogen Peroxide Concentrations GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/chem/ca.txt Data File; GRIP Calcium Concentrations GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/grip/chem/nh4.txt Data File; GRIP Ammonium Concentrations USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11