Recursos de colección

PANGAEA - Publishing Network for Geoscientific & Environmental Data (831.663 recursos)

The information system PANGAEA is operated as an Open Access library aimed at archiving, publishing and distributing georeferenced data from earth system research. The system guarantees long-term availability of its content through a commitment of the operating institutions.

Datasets of project "Greenland Ice Core Project/Greenland Ice Sheet Project"

Mostrando recursos 1 - 20 de 124

  1. (Table 1) Micro-inclusion counts and ion concentrations in the five GRIP ice-core sections

    Sakurai, Toshimitsu; Iizuka, Yoshinori; Horikawa, Shinichiro; Johnsen, Sigfus J; Dahl-Jensen, Dorthe; Steffensen, Jørgen Peder; Hondoh, Takeo
    We provide the first direct evidence that a number of water-soluble compounds, in particular calcium sulfate (CaSO4 2H2O) and calcium carbonate (CaCO3), are present as solid, micron-sized inclusions within the Greenland GRIP ice core. The compounds are detected by two independent methods: micro-Raman spectroscopy of a solid ice sample, and energy-dispersive X-ray spectroscopy of individual inclusions remaining after sublimation. CaSO4 2H2O is found in abundance throughout the Holocene and the last glacial period, while CaCO3 exists mainly in the glacial period ice. We also present size and spatial distributions of the micro-inclusions. These results suggest that water-soluble aerosols in the...

  2. The Antarctic ice core chronology (AICC2012)

    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
    Abstract of Bazin et al. (2013): An accurate and coherent chronological framework is essential for the interpretation of climatic and environmental records obtained from deep polar ice cores. Until now, one common ice core age scale had been developed based on an inverse dating method (Datice), combining glaciological modelling with absolute and stratigraphic markers between 4 ice cores covering the last 50 ka (thousands of years before present) (Lemieux-Dudon et al., 2010). In this paper, together with the companion paper of Veres et al. (2013), we present an extension of this work back to 800 ka for the NGRIP, TALDICE,...

  3. Ion concentration and deduced chemical compounds of the GRIP and Dome Fuji ice cores, Greenland and Antarctica

    Iizuka, Yoshinori; Horikawa, Shinichiro; Sakurai, Toshimitsu; Johnson, Sigfus; Dahl-Jensen, Dorthe; Steffensen, Jørgen Peder; Hondoh, Takeo
    We have proposed a method of deducing the chemical compounds found in deep polar ice cores by analyzing the balance between six major ions (Cl-, NO3-, SO4**2-, Na+, Mg2+, and Ca2+). The method is demonstrated for the Holocene and last glacial maximum regions of the Dome Fuji and GRIP ice cores. The dominant compounds depend only on the ion balance and the sequence of chemical reactions. In priority order, the principle salts are calcium sulfate, other sulfates, nitrate, chloride, and carbonate. The chemical abundances deduced by this method agree well with the results of Raman spectroscopy on individual salt inclusions....

  4. Synchronization of the NGRIP, GRIP, and GISP2 ice cores

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

  5. (Table 1) Match points representing synchronous events in the NGRIP, GRIP, and GISP2 ice cores

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

  6. 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...

  7. Mineralogy and isotope chemistry of GISP2 and potential source areas

    Biscaye, Pierre Eginton; Grousset, Francis E; Revel, Marie; van der Gaast, Sjierk; Zielinski, G A; Vaars, A; Kukla, George J
    Samples of dust from the Greenland Ice Sheet Project 2 (GISP2) ice core, Summit, Greenland, dated within marine isotope stage 2 (between 23,340 and 26,180 calendar years B.P.) around the time of the coldest, local, last glacial temperatures, have been analyzed to determine their provenance. To accomplish this, we have compared them with approximately Coeval aeolian sediments (mostly loesses) sampled in possible source areas (PSAs) from around the northern hemisphere. The <5-µm grain-size fraction of these samples was analyzed on the basis that it corresponds to the atmospheric dust component of that time and locale, which was sufficiently fine grained...

  8. Stable isotope stacks from GRIP and GISP ice cores

    White, James W C; Barlow, L K; Fisher, D; Grootes, Pieter Meiert; Jouzel, Jean; Johnsen, Sigfus J; Stuiver, Minze; Clausen, Henrik Brink
    Recent efforts to link the isotopic composition of snow in Greenland with meteorological and climatic parameters have indicated that relatively local information such as observed annual temperatures from coastal Greenland sites, as well as more synoptic scale features such as the North Atlantic Oscillation (NAO) and the temperature seesaw between Jakobshaven, Greenland, and Oslo, Norway, are significantly correlated with d18O and dD values from the past few hundred years measured in ice cores. In this study we review those efforts and then use a new record of isotope values from the Greenland Ice Sheet Project 2 and Greenland Ice Core...

  9. Deuterium analysis of ice core GISP2

    Barlow, L K; White, James W C; Barry, Roger G; Rogers, John; Grootes, Pieter Meiert
    The Greenland Ice Sheet Project 2 (GISP2) core can enhance our understanding of the relationship between parameters measured in the ice in central Greenland and variability in the ocean, atmosphere, and cryosphere of the North Atlantic Ocean and adjacent land masses. Seasonal (summer, winter) to annual responses of dD and deuterium excess isotopic signals in the GISP2 core to the seesaw in winter temperatures between West Greenland and northern Europe from A.D. 1840 to 1970 are investigated. This seesaw represents extreme modes of the North Atlantic Oscillation, which also influences sea surface temperatures (SSTs), atmospheric pressures, geostrophic wind strength, and...

  10. Stable isotope stacked record of ice core GRIP913

    White, James W C; Barlow, L K; Fisher, D; Grootes, Pieter Meiert; Jouzel, Jean; Johnsen, Sigfus J; Stuiver, Minze; Clausen, Henrik Brink

  11. Stable isotope stacked record of ice core GRIP912

    White, James W C; Barlow, L K; Fisher, D; Grootes, Pieter Meiert; Jouzel, Jean; Johnsen, Sigfus J; Stuiver, Minze; Clausen, Henrik Brink

  12. Stable isotope stacked record of ice core GRIP893

    White, James W C; Barlow, L K; Fisher, D; Grootes, Pieter Meiert; Jouzel, Jean; Johnsen, Sigfus J; Stuiver, Minze; Clausen, Henrik Brink

  13. Stable isotope stacked record of ice core GRIP892

    White, James W C; Barlow, L K; Fisher, D; Grootes, Pieter Meiert; Jouzel, Jean; Johnsen, Sigfus J; Stuiver, Minze; Clausen, Henrik Brink

  14. Stable isotope stacked record of ice core GRIP891

    White, James W C; Barlow, L K; Fisher, D; Grootes, Pieter Meiert; Jouzel, Jean; Johnsen, Sigfus J; Stuiver, Minze; Clausen, Henrik Brink

  15. Stable isotope stacked record of ice core GRIP

    White, James W C; Barlow, L K; Fisher, D; Grootes, Pieter Meiert; Jouzel, Jean; Johnsen, Sigfus J; Stuiver, Minze; Clausen, Henrik Brink

  16. Stable isotope stacked record of ice cores GRIP and GISP

    White, James W C; Barlow, L K; Fisher, D; Grootes, Pieter Meiert; Jouzel, Jean; Johnsen, Sigfus J; Stuiver, Minze; Clausen, Henrik Brink

  17. Temperature reconstruction from borehole measurements of ice core Law_Dome, Antarctica

    Dahl-Jensen, Dorthe; Morgan, Vin; Elcheikh, Alan

  18. Temperature reconstruction from borehole measurements of ice core DEY/3, Greenland

    Dahl-Jensen, Dorthe; Mosegaard, Klaus; Gundestrup, Niels S; Clow, Gary D; Johnsen, Sigfus J; Hansen, A W; Balling, Niels

  19. Temperature reconstruction from borehole measurements of ice core GRIP, Greenland

    Dahl-Jensen, Dorthe; Mosegaard, Klaus; Gundestrup, Niels S; Clow, Gary D; Johnsen, Sigfus J; Hansen, A W; Balling, Niels

  20. 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...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.