# NEEM Ice Core MIS3 d15N Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite Publication, and Online_Resource and date accessed 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=519:1:0::::P1_STUDY_ID:15615 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/icecore/greenland/summit/neem/lsce-neem-d15n-mis3-guillevic2013.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: ice core #-------------------- # Contribution_Date # Date: 2013-12-05 #-------------------- # Title # Study Name: NEEM Ice Core MIS3 d15N Data #-------------------- # Investigators # Investigators: Guillevic, M.; Landais, A.; Bazin, L.; Prié, F. #-------------------- # Description_and_Notes # Description: d15N data from the North Greenland Eemian Ice Drilling (NEEM) project ice core # for Dansgaard-Oeschger events DO-8 to DO-10. Data measured at LSCE using a manual melt-refreeze # technique and a delta V mass spectrometer. #-------------------- # Publication # Authors: M. Guillevic, L. Bazin, A. Landais, P. Kindler, A. Orsi, V. Masson-Delmotte, T. Blunier, S.L. Buchardt, E. Capron, M. Leuenberger, P. Martinerie, F. Prié, and B.M. Vinther # Published_Date: 2013-05-07 # Published_Title: Spatial gradients of temperature, accumulation and d18O-ice in Greenland over a series of Dansgaard-Oeschger events # Journal_Name: Climate of the Past # Volume: 9 # Issue: 3 # Pages: 1029-1051 # DOI: 10.5194/cp-9-1029-2013 # Online_Resource: www.clim-past.net/9/1029/2013/ # Full_Citation: Guillevic, M., Bazin, L., Landais, A., Kindler, P., Orsi, A., Masson-Delmotte, V., # Blunier, T., Buchardt, S. L., Capron, E., Leuenberger, M., Martinerie, P., Prié, F., and Vinther, B. M. (2013). # Spatial gradients of temperature, accumulation and d18O-ice in Greenland over a series of Dansgaard–Oeschger events. # Clim. Past, 9:1029–1051. # Abstract: Air and water stable isotope measurements from four Greenland deep ice cores (GRIP, GISP2, NGRIP and NEEM) are investigated over a series of Dansgaard-Oeschger events (DO 8, 9 and 10), which are representative of glacial millennial scale variability. Combined with firn modeling, air isotope data allow us to quantify abrupt temperature increases for each drill site (1sigma = 0.6 °C for NEEM, GRIP and GISP2, 1.5 °C for NGRIP). Our data show that the magnitude of stadial-interstadial temperature increase is up to 2 °C larger in central and North Greenland than in northwest Greenland: i.e., for DO 8, a magnitude of +8.8 °C is inferred, which is significantly smaller than the +11.1 °C inferred at GISP2. The same spatial pattern is seen for accumulation increases. This pattern is coherent with climate simulations in response to reduced sea-ice extent in the Nordic seas. The temporal water isotope (d18O)-temperature relationship varies between 0.3 and 0.6 (±0.08) ‰ °C-1 and is systematically larger at NEEM, possibly due to limited changes in precipitation seasonality compared to GISP2, GRIP or NGRIP. The gas age-ice age difference of warming events represented in water and air isotopes can only be modeled when assuming a 26% (NGRIP) to 40% (GRIP) lower accumulation than that derived from a Dansgaard-Johnsen ice flow model. # #------------------ # Funding_Agency # Funding_Agency_Name: NEEM is # directed and organized by the Center for Ice and Climate at the # Niels Bohr Institute and US NSF, Office of Polar Programs. It is # supported by funding agencies and institutions in 14 countries: # Belgium (FNRS-CFB and FWO), Canada (GSC), China (CAS), # Denmark (FIST), France (IPEV, CNRS/INSU, CEA and ANR), # Germany (AWI), Iceland (RannIs), Japan (NIPR), Korea (KOPRI), # The Netherlands (NWO/ALW), Sweden (VR), Switzerland (SNF), # UK (NERC) and the USA (US NSF, Office of Polar Programs). # LSCE analytical work has been funded by the ANR VMC NEEM # project. We also thank the University of Copenhagen and the # CNRS/INSU/LEFE program. #------------------ # Site_Information # Site_Name: NEEM # Location: North America>Greenland # Country: Greenland # Northernmost_Latitude: 77.45 # Southernmost_Latitude: 77.45 # Easternmost_Longitude: -51.06 # Westernmost_Longitude: -51.06 # Elevation: 2484 m #------------------ # Data_Collection # Collection_Name: NEEM2013d15N # Earliest_Year: 43400 # Most_Recent_Year: 36750 # Time_Unit: years before 2000 AD # Core_Length: 2500 m for the entire core #------------------ # Chronology: The NEEM ice core chronology (ice and gas) can be found in the following paper: # S.O. Rasmussen, P.M. Abbott, T. Blunier, A.J. Bourne, E. Brook, S.L. Buchardt, C. Buizert, J. Chappellaz, H.B. Clausen, # E. Cook, D. Dahl-Jensen, S.M. Davies, M. Guillevic, S. Kipfstuhl, T. Laepple, I.K. Seierstad, J.P. Severinghaus, # J.P. Steffensen, C. Stowasser, A. Svensson, P. Vallelonga, B.M. Vinther, F. Wilhelms, and M. Winstrup # A first chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core # Clim. Past, 9, 2713–2730, 2013, www.clim-past.net/9/2713/2013/, doi:10.5194/cp-9-2713-2013 #---------------- # Variables # # Data variables follow (have no #) # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components # (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) depth_m depth, , , m, , ice core, middle depth of the sample - Each ice sample was originally 4 cm long - 0.4 to 0.5 cm were removed on each side of the ice sample before measurement - Each data point therefore represent a 3 cm average, ,N d15N d15N, , Pooled standard deviation 0.006 permil, permil vs air, , ice core, average of the replicates Measured at LSCE Gif sur Yvette France, ,N #---------------- # Data: depth_m d15N 1746.8 0.354 1747.9 0.340 1749 0.347 1750.1 0.329 1751.2 0.346 1752.3 0.360 1753.4 0.375 1754.5 0.380 1756.15 0.397 1756.7 0.383 1757.25 0.407 1757.8 0.402 1759.45 0.399 1760.55 0.388 1761.1 0.388 1761.65 0.394 1762.2 0.410 1762.75 0.417 1764.95 0.414 1765.5 0.436 1766.09 0.443 1766.6 0.452 1767.15 0.457 1767.7 0.470 1768.25 0.463 1768.8 0.462 1769.35 0.493 1769.9 0.444 1770.45 0.426 1771 0.386 1771.55 0.383 1772.1 0.377 1772.65 0.381 1773.2 0.371 1773.75 0.386 1774.3 0.390 1774.85 0.376 1775.95 0.391 1776.5 0.388 1777.05 0.402 1777.6 0.380 1778.15 0.371 1778.7 0.370 1779.25 0.375 1780.35 0.358 1781.45 0.345 1782.55 0.353 1784.75 0.345 1785.3 0.362 1785.93 0.362 1786.4 0.380 1786.95 0.416 1787.5 0.413 1788.05 0.390 1788.6 0.367 1789.15 0.366 1789.7 0.363 1790.25 0.354 1790.8 0.340 1791.35 0.330 1791.9 0.327 1792.45 0.311 1793.55 0.322 1794.65 0.361 1795.75 0.382 1796.3 0.369 1796.85 0.368 1797.7 0.384 1797.95 0.376 1798.5 0.389 1799.05 0.397 1799.6 0.429 1800.15 0.430 1801 0.432 1801.25 0.421 1801.72 0.371 1802.82 0.363 1803.92 0.352 1805.02 0.337 1806.12 0.328 1807.22 0.328 1809.42 0.365 1810.52 0.338 1811.62 0.349 1812.72 0.364 1813.78 0.378 1814.92 0.379 1815.55 0.393 1816.1 0.391 1816.65 0.405 1817.2 0.411 1817.75 0.425 1818.3 0.427 1818.85 0.444 1819.4 0.443 1819.95 0.411 1820.5 0.357