# North Greenland Ice Core Project Oxygen Isotope Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original reference when using these data, # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed # # # # Online_Resource: http://hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_study_id:2481 # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/24611 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/ngrip/isotopes/ngrip-d18o-50yr.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Ice Cores # -------------------- # Contribution_date # Date: 2004-10-01 # -------------------- # Title # Study_Name: North Greenland Ice Core Project Oxygen Isotope Data # -------------------- # Investigators # Investigators: North Greenland Ice Core Project members # -------------------- # Description_and_Notes # Description: High resolution Climate Record of the Northern Hemisphere back into the last Interglacial Period. North Greenland Ice-Core Project (NorthGRIP) Members. # # The North Greenland Ice Core Project (NGRIP) site is located at 75.10 °N and 42.32 °W, elevation of 2,917 m, ice thickness of 3,085 m. The NGRIP drilling started in 1996, and bedrock was reached in July 2003. # # In this text file we list the NGRIP oxygen 18 values as 50 year mean values # using the same preliminary age scale as in Figure 2c of the accompanying paper. # Data was measured against VSMOW at the Niels Bohr Institute for Astronomy, # Physics and Geophysics, Department of Geophysics, University of Copenhagen. # Accuracy of individual measurements is 0.07 permille. # The initial isotope data series is based on 5 cm continuous sampling from # surface to bottom of the core, or 61100 individual measurements. # # Improved dating of the NGRIP core and additional data will be posted on our web site http://www.glaciology.gfy.ku.dk/ngrip/index_eng.htm when it becomes available. # # -------------------- # Publication # Authors: North Greenland Ice Core Project Members # Published_Date_or_Year: 2004-09-09 # Published_Title: High-resolution record of Northern Hempisphere climate extending into the last interglacial period # Journal_Name: Nature # Volume: 431 # Edition: # Issue: 7005 # Pages: 147-151 # DOI: # Online_Resource: # Full_Citation: # Abstract: Two deep ice cores from central Greenland, drilled in the 1990s, have played a key role in climate reconstructions of the Northern Hemisphere, but the oldest sections of the cores were disturbed in chronology owing to ice folding near the bedrock. Here we present an undisturbed climate record from a North Greenland ice core, which extends back to 123,000 years before the present, within the last interglacial period. The oxygen isotopes in the ice imply that climate was stable during the last interglacial period, with temperatures 5C warmer than today. We find unexpectedly large temperature differences between our new record from northern Greenland and the undisturbed sections of the cores from central Greenland, suggesting that the extent of ice in the Northern Hemisphere modulated the latitudinal temperature gradients in Greenland. This record shows a slow decline in temperatures that marked the initiation of the last glacial period. Our record reveals a hitherto unrecognized warm period initiated by an abrupt climate warming about 115,000 years ago, before glacial conditions were fully developed. This event does not appear to have an immediate Antarctic counterpart, suggesting that the climate see-saw between the hemispheres (which dominated the last glacial period) was not operating at this time. # -------------------- # Authors: Anderson, D.M., Tardif, R., Horlick, K., Erb, M.P., Hakim, G.J., Noone, D., Perkins, W.A., and E. Steig # Published_Date_or_Year: 2018 # Published_Title: Additions to the last millennium reanalysis multi-proxy database # Journal_Name: Data Science Journal # Volume: # Edition: # Issue: # Pages: # Report_Number: # DOI: # Online_Resource: # Full_Citation: Anderson, D.M., Tardif, R., Horlick, K., Erb, M.P., Hakim, G., J., Noone, D., Perkins, W.A., and E. Steig, submitted. Additions to the last millennium reanalysis multi-proxy database. Data Science Journal. # Abstract: Progress in paleoclimatology increasingly occurs via data syntheses. We describe additions to a collection prepared for use in paleoclimate state estimation, specifically the Last Millennium Reanalysis (LMR). The 2290 additional series include 2152 tree ring chronologies and 138 other series. They supplement the collection used previously and together form a database titled LMRdb 1.0.0. The additional data draws from lake core, ice core, coral, speleothem, and tree ring archives, using published data primarily from the NOAA Paleoclimatology archive and a set of tree ring width chronologies standardized from raw International Tree Ring Data Bank ring width series. In contrast to many previous paleo compilations, the data were not selected (screened) on the basis of their environmental correlation, multi-century length, or other attributes. The inclusion of proxies sensitive to moisture and other environmental variables expands their use in data assimilation. A preliminary calibration using linear regression with mean annual temperature reveals characteristics of the proxy series and their relationship to temperature, as well as the noise and error characteristics of the records. The additional records are structured as individual files in the NOAA Paleoclimatology format and archived at NOAA Paleoclimatology (Anderson et al. 2018) and will continue to be improved and expanded as part of the LMR Project. The additions represent a four-fold increase in the number of records available for assimilation, provide expanded geographic coverage, and add additional proxy variables. Applications include data assimilation, proxy system model development, and paleoclimate reconstruction using climate field reconstruction and other methods. #------------------ # Funding_Agency # Funding_Agency_Name: # Grant: # -------------------- # Funding_Agency_Name: National Science Foundation # Grant:AGS-1304263 # Funding_Agency_Name: National Oceanic and Atmospheric Administration # Grant:NA14OAR4310176 #------------------ # Site_Information # Site_Name: # Location: North America>Greenland # Country: # Northernmost_Latitude: 70.166 # Southernmost_Latitude: 70.166 # Easternmost_Longitude: -42.533 # Westernmost_Longitude: -42.533 # Elevation: 3085 m # -------------------- # Data_Collection # Collection_Name: 04NGRI01 # Earliest_Year: 89725 # Most_Recent_Year: 25 # Time_Unit: yb_2000 # Notes: {"database":"LMR"} # # -------------------- # Variables # # Data variables follow that are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, 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