noaa-other-15536 GISP2-GICC05 Chronology Conversion Software Obrochta, S.P.; Yokoyama, Y.; Morén, J.; Crowley, T.J. GISP2-GICC05 Chronology Conversion Software 2013-11-20 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/15536 Investigator S.P. Obrochta Investigator Y. Yokoyama Investigator J. Morén Investigator T.J. Crowley earth science paleoclimate others geoscientificInformation 103740 cal yr BP 8240 cal yr BP Complete -90 90 -180 180 Geographic Region Global Global>LATITUDE >LONGITUDE 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 Stephen P. Obrochta, Yusuke Yokoyama, Jan Morén, Thomas J. Crowley 2014 Quaternary Geochronology 20 1-7 10.1016/j.quageo.2013.09.001 http://www.sciencedirect.com/science/article/pii/S1871101413000745

Marine and lacustrine sediment-based paleoclimate records are often not comparable within the early to middle portion of the last glacial cycle. This is due in part to significant revisions over the past 15 years to the Greenland ice core chronologies commonly used to assign ages outside of the range of radiocarbon dating. Therefore, creation of a compatible chronology is required prior to analysis of the spatial and temporal nature of climate variability at multiple locations. Here we present an automated mathematical function that updates GISP2-based chronologies to the newer, NGRIP GICC05 age scale between 8.24 and 103.74 ka b2k. The script uses, to the extent currently available, climate-independent volcanic synchronization of these two ice cores, supplemented by oxygen isotope alignment. The modular design of the script allows substitution for a more comprehensive volcanic matching, once it becomes available. Usage of this function highlights on the GICC05 chronology, for the first time for the entire last glaciation, the proposed global climate relationships during the series of large and rapid millennial stadial-interstadial events. STUDY NOTES: An automated mathematical function that updates GISP2-based chronologies to the newer, NGRIP GICC05 age scale between 8.24 and 103.74 ka b2k. Matlab (file g2n.m) and python (stored in compressed file g2n-python.zip) versions are included, plus tie point data input files in text, Excel, or Matlab format (g2nties.txt, g2nties.xlsx, g2nties.mat). Matlab files can be read with Matlab software or the open source version octave. The python version can also be run as an online utility, available at: http://paleo10.org/g2n/

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/softlib/g2n/g2n-python.zip GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/softlib/g2n/g2nties.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/softlib/g2n/g2nties.xlsx GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/softlib/g2n/readme-obrochta2014.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/softlib/g2n/g2n.m GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/softlib/g2n/g2nties.mat USA/NOAA DIF Version 9.8.4 2019-06-18 2019-06-18