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Datasets of project "North Greenland Ice Core Project"

Mostrando recursos 1 - 19 de 19

  1. Specific conductivity and hydrogen ions measured on two ice core (NEEM and NGRIP)

    Rasmussen, Sune Olander; Abbott, Peter M; Blunier, Thomas; Bourne, Mark; Brook, Edward J; Buchardt, Susanne L; Buizert, Christo; Chappellaz, Jérôme A; Clausen, Henrik Brink; Cook, Eliza; Dahl-Jensen, Dorthe; Davies, Siwan M; Guillevic, Myriam; Kipfstuhl, Sepp; Laepple, Thomas; Seierstad, Inger K; Severinghaus, Jeffrey P; Steffensen, Jørgen Peder; Stowasser, Christopher; Svensson, Anders M; Vallelonga, Paul; Vinther, Bo M; Wilhelms, Frank; Winstrup, Mai
    A stratigraphy-based chronology for the North Greenland Eemian Ice Drilling (NEEM) ice core has been derived by transferring the annual layer counted Greenland Ice Core Chronology 2005 (GICC05) and its model extension (GICC05modelext) from the NGRIP core to the NEEM core using 787 match points of mainly volcanic origin identified in the electrical conductivity measurement (ECM) and dielectrical profiling (DEP) records. Tephra horizons found in both the NEEM and NGRIP ice cores are used to test the matching based on ECM and DEP and provide five additional horizons used for the timescale transfer. A thinning function reflecting the accumulated strain...

  2. Concentration of hydrogen ions measured with the Electrical Conductivity Method (ECM) on the NGRIP ice core

    Rasmussen, Sune Olander; Abbott, Peter M; Blunier, Thomas; Bourne, Mark; Brook, Edward J; Buchardt, Susanne L; Buizert, Christo; Chappellaz, Jérôme A; Clausen, Henrik Brink; Cook, Eliza; Dahl-Jensen, Dorthe; Davies, Siwan M; Guillevic, Myriam; Kipfstuhl, Sepp; Laepple, Thomas; Seierstad, Inger K; Severinghaus, Jeffrey P; Steffensen, Jørgen Peder; Stowasser, Christopher; Svensson, Anders M; Vallelonga, Paul; Vinther, Bo M; Wilhelms, Frank; Winstrup, Mai

  3. Specific conductivity measured with the dielectric profiling (DEP) technique on the NGRIP ice core

    Rasmussen, Sune Olander; Abbott, Peter M; Blunier, Thomas; Bourne, Mark; Brook, Edward J; Buchardt, Susanne L; Buizert, Christo; Chappellaz, Jérôme A; Clausen, Henrik Brink; Cook, Eliza; Dahl-Jensen, Dorthe; Davies, Siwan M; Guillevic, Myriam; Kipfstuhl, Sepp; Laepple, Thomas; Seierstad, Inger K; Severinghaus, Jeffrey P; Steffensen, Jørgen Peder; Stowasser, Christopher; Svensson, Anders M; Vallelonga, Paul; Vinther, Bo M; Wilhelms, Frank; Winstrup, Mai

  4. delta 18O measured on ice core NGRIP on AICC2012 chronology

    Bazin, Lucie; Landais, Amaelle; Lemieux-Dudon, Bénédicte; Toyé Mahamadou Kele, H; Veres, Daniel; Parrenin, Frédéric; Martinerie, P; Ritz, Catherine; Capron, Emilie; Lipenkov, Vladimir Y; Loutre, M-F; Raynaud, Dominique; Vinther, Bo M; Svensson, Anders M; Rasmussen, Sune Olander; Severi, Mirko; Blunier, Thomas; Leuenberger, Markus; Fischer, Hubertus; Masson-Delmotte, Valerie; Chappellaz, Jérôme A; Wolff, Eric W

  5. Methane measured on ice core NGRIP on AICC2012 chronology

    Bazin, Lucie; Landais, Amaelle; Lemieux-Dudon, Bénédicte; Toyé Mahamadou Kele, H; Veres, Daniel; Parrenin, Frédéric; Martinerie, P; Ritz, Catherine; Capron, Emilie; Lipenkov, Vladimir Y; Loutre, M-F; Raynaud, Dominique; Vinther, Bo M; Svensson, Anders M; Rasmussen, Sune Olander; Severi, Mirko; Blunier, Thomas; Leuenberger, Markus; Fischer, Hubertus; Masson-Delmotte, Valerie; Chappellaz, Jérôme A; Wolff, Eric W

  6. AICC2012 chronology for ice core NGRIP

    Bazin, Lucie; Landais, Amaelle; Lemieux-Dudon, Bénédicte; Toyé Mahamadou Kele, H; Veres, Daniel; Parrenin, Frédéric; Martinerie, P; Ritz, Catherine; Capron, Emilie; Lipenkov, Vladimir Y; Loutre, M-F; Raynaud, Dominique; Vinther, Bo M; Svensson, Anders M; Rasmussen, Sune Olander; Severi, Mirko; Blunier, Thomas; Leuenberger, Markus; Fischer, Hubertus; Masson-Delmotte, Valerie; Chappellaz, Jérôme A; Wolff, Eric W

  7. (Data D1) Annual climate proxy data from the NGRIP ice core, Greenland

    Steffensen, Jørgen Peder; Andersen, Katrine K; Bigler, Matthias; Clausen, Henrik Brink; Dahl-Jensen, Dorthe; Fischer, Hubertus; Goto-Azuma, Kumiko; Hansson, Margareta E; Johnsen, Sigfus J; Jouzel, Jean; Masson-Delmotte, Valerie; Popp, Trevor; Rasmussen, Sune Olander; Röthlisberger, Regine; Ruth, Urs; Stauffer, Bernhard; Siggaard-Andersen, Marie-Louise; Sveinbjörnsdottir, Arny E; Svensson, Anders M; White, James W C
    The last two abrupt warmings at the onset of our present warm interglacial period, interrupted by the Younger Dryas cooling event, were investigated at high temporal resolution from the North Greenland Ice Core Project ice core. The deuterium excess, a proxy of Greenland precipitation moisture source, switched mode within 1 to 3 years over these transitions and initiated a more gradual change (over 50 years) of the Greenland air temperature, as recorded by stable water isotopes. The onsets of both abrupt Greenland warmings were slightly preceded by decreasing Greenland dust deposition, reflecting the wetting of Asian deserts. A northern shift...

  8. (Table 1) Gas tie points used to correlate the ice cores NGRIP and EDML

    Capron, Emilie; Landais, Amaelle; Lemieux-Dudon, Bénédicte; Schilt, Adrian; Masson-Delmotte, Valerie; Buiron, Daphné; Chappellaz, Jérôme A; Dahl-Jensen, Dorthe; Johnsen, Sigfus J; Leuenberger, Markus; Loulergue, Laetitia; Oerter, Hans
    Water isotope records from the EPICA Dronning Maud Land (EDML) and the NorthGRIP ice cores have revealed a one to one coupling between Antarctic Isotope Maxima (AIM) and Greenland Dansgaard-Oeschger (DO) events back to 50 kyr. In order to explore if this north-south coupling is persistent over Marine Isotopic Stage 5 (MIS 5), a common timescale must first be constructed. Here, we present new records of d18O of O2 (d18Oatm) and methane (CH4) measured in the air trapped in ice from the EDML (68-147 kyr) and NorthGRIP (70-123 kyr) ice cores. We demonstrate that, through the period of interest, CH4 records...

  9. (Table 1) Gas tie points used to correlate the ice cores NGRIP and EDML

    Capron, Emilie; Landais, Amaelle; Lemieux-Dudon, Bénédicte; Schilt, Adrian; Masson-Delmotte, Valerie; Buiron, Daphné; Chappellaz, Jérôme A; Dahl-Jensen, Dorthe; Johnsen, Sigfus J; Leuenberger, Markus; Loulergue, Laetitia; Oerter, Hans
    Water isotope records from the EPICA Dronning Maud Land (EDML) and the NorthGRIP ice cores have revealed a one to one coupling between Antarctic Isotope Maxima (AIM) and Greenland Dansgaard-Oeschger (DO) events back to 50 kyr. In order to explore if this north-south coupling is persistent over Marine Isotopic Stage 5 (MIS 5), a common timescale must first be constructed. Here, we present new records of d18O of O2 (d18Oatm) and methane (CH4) measured in the air trapped in ice from the EDML (68-147 kyr) and NorthGRIP (70-123 kyr) ice cores. We demonstrate that, through the period of interest, CH4 records...

  10. Match points used for synchronization of NGRIP, GRIP, and GISP2

    Rasmussen, Sune Olander; Andersen, Katrine K; Svensson, Anders M; Steffensen, Jørgen Peder; Vinther, Bo M; Clausen, Henrik Brink; Siggaard-Andersen, Marie-Louise; Johnsen, Sigfus J; Larsen, L B; Dahl-Jensen, Dorthe; Bigler, Matthias; Röthlisberger, Regine; Fischer, Hubertus; Goto-Azuma, Kumiko; Hansson, Margareta E; Ruth, Urs
    We here present a synchronization of the NGRIP, GRIP, and GISP2 ice cores based mainly on volcanic events over the period 14.9-32.45 ka b2k (before AD 2000), corresponding to Marine Isotope Stage 2 (MIS 2) and the end of MIS 3. The matching provides a basis for applying the recent NGRIP-based Greenland Ice Core Chronology 2005 (GICC05) time scale to the GRIP and GISP2 ice cores, thereby making it possible to compare the synchronized palaeoclimate profiles of the cores in detail and to identify relative accumulation differences between the cores. Based on the matching, a period of anomalous high accumulation...

  11. Sub-annual dust concentration and size distribution data from ice core NGRIP sections corresponding to the early Holocene, Allerod IS, LGM, late glacial and DO-7

    Wolff, Katrin

  12. Sub-annual dust concentration and size distribution data from ice core NGRIP sections corresponding to the early Holocene, Allerod IS, LGM, late glacial and DO-7

    Wolff, Katrin

  13. Methane concentration and delta deuterium of methane from the NGRIP ice core

    Bock, Michael; Schmitt, Jochen; Möller, Lars; Spahni, Renato; Blunier, Thomas; Fischer, Hubertus
    The causes of past changes in the global methane cycle and especially the role of marine methane hydrate (clathrate) destabilization events are a matter of debate. Here we present evidence from the North Greenland Ice Core Project ice core based on the hydrogen isotopic composition of methane [dD(CH4)] that clathrates did not cause atmospheric methane concentration to rise at the onset of Dansgaard-Oeschger (DO) events 7 and 8. Box modeling supports boreal wetland emissions as the most likely explanation for the interstadial increase. Moreover, our data show that dD(CH4) dropped 500 years before the onset of DO 8, with CH4...

  14. Dust concentration in the NGRIP ice core

    Ruth, Urs
    Corresponding millennial-scale climate changes have been reported from the North Atlantic region and from east Asia for the last glacial period on independent timescales only. To assess their degree of synchrony we suggest interpreting Greenland ice core dust parameters as proxies for the east Asian monsoon systems. This allows comparing North Atlantic and east Asian climate on the same timescale in high resolution ice core data without relative dating uncertainties. We find that during Dansgaard-Oeschger events North Atlantic region temperature and east Asian storminess were tightly coupled and changed synchronously within 5-10 years with no systematic lead or lag, thus...

  15. 50 year means of oxygen isotope data from ice core NGRIP

    North Greenland Ice Core Project Members
    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 5 °C warmer than today. We find unexpectedly large temperature differences between our new...

  16. Calcium concentration from the ice core NGRIP on the GICC05 time scale

    Rasmussen, Sune Olander; Seierstad, Inger K; Andersen, Katrine K; Bigler, Matthias; Dahl-Jensen, Dorthe; Johnsen, Sigfus J

  17. Early Holocene Greenland Ice Core Chronology 2005 (GICC05) and 10 year means of oxygen isotope data from ice core NGRIP

    Rasmussen, Sune Olander; Vinther, Bo M; Clausen, Henrik Brink; Andersen, Katrine K

  18. Greenland Ice Core Chronology 2005 (GICC05) and 20 year means of oxygen isotope data from ice core NGRIP

    Andersen, Katrine K; Bigler, Matthias; Buchardt, Susanne L; Clausen, Henrik Brink; Dahl-Jensen, Dorthe; Davies, Siwan M; Fischer, Hubertus; Goto-Azuma, Kumiko; Hansson, Margareta E; Heinemeier, Jan; Johnsen, Sigfus J; Larsen, L B; Muscheler, Raimund; Olsen, G J; Rasmussen, Sune Olander; Röthlisberger, Regine; Ruth, Urs; Seierstad, Inger K; Siggaard-Andersen, Marie-Louise; Steffensen, Jørgen Peder; Svensson, Anders M; Vinther, Bo M

  19. Particle concentration and size distribution in the NGRIP ice core

    Ruth, Urs; Steffensen, Jørgen Peder; Bigler, Matthias
    A novel laser microparticle detector used in conjunction with continuous sample melting has provided a more than 1500 m long record of particle concentration and size distribution of the NGRIP ice core, covering continuously the period approximately from 9.5-100 kyr before present; measurements were at 1.65 m depth resolution, corresponding to approximately 35-200 yr. Particle concentration increased by a factor of 100 in the Last Glacial Maximum (LGM) compared to the Preboreal, and sharp variations of concentration occurred synchronously with rapid changes in the delta18O temperature proxy. The lognormal mode µ of the volume distribution shows clear systematic variations with...

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