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  • 1
    Book
    Book
    Concentration and size distribution of microparticles in the NGRIP ice core (Central Greenland) during the last glacial period : = Konzentration und Größenverteilung von Mikropartikeln im NGRIP Eiskern (Zentralgrönland) während des letzten Glazials (2002)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Details Availability
    Keywords: Paleoclimatology Greenland ; Ice Analysis ; Greenland ; Glaciology ; Mineral dusts Greenland ; Dissertation ; Hochschulschrift ; Mittelgrönland ; Eiskern ; Pleistozän ; Staub ; Paläoklimatologie ; Grönland ; Eis ; Mikropartikel
    Type of Medium: Book
    Pages: II, 146 S. , Ill., graph. Darst., Kt.
    Series Statement: Berichte zur Polar- und Meeresforschung 428
    URL: https://www.gbv.de/dms/tib-ub-hannover/355718111.pdf
    URL: http://www.ub.uni-heidelberg.de/archiv/2291
    RVK:
    RY 40381
    RVK:
    RY 20075
    Language: English
    Note: Elektronische Fassung: http://www.ub.uni-heidelberg.de/archiv/2291 , Literaturangaben , Zugl.: Bremen, Univ., Diss., 2002
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  • 2
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    Particle concentration and size distribution in the NGRIP ice core (2003)
    PANGAEA
    In:  Supplement to: Ruth, Urs; Wagenbach, Dietmar; Steffensen, Jørgen Peder; Bigler, Matthias (2003): Continuous record of microparticle concentration and size distribution in the central Greenland NGRIP ice core during the last glacial period. Journal of Geophysical Research: Atmospheres, 108(D3), 4098, https://doi.org/10.1029/2002JD002376
    Details
    Publication Date: 2023-04-22
    Description: 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 smaller modes during warmer climates and coarser modes during colder periods. We find µ ~ 1.7 µm diameter during LGM and µ ~ 1.3 µm during the Preboreal. On timescales below several 100 years µ and the particle concentration exhibit a certain degree of independence present especially during warm periods, when µ generally is more variable. Using highly simplifying considerations for atmospheric transport and deposition of particles we infer that (1) the observed changes of µ in the ice largely reflect changes in the size of airborne particles above the ice sheet and (2) changes of µ are indicative of changes in long range atmospheric transport time. From the observed size changes we estimate shorter transit times by roughly 25% during LGM compared to the Preboreal. The associated particle concentration increase from more efficient long range transport is estimated to less than one order of magnitude.
    Keywords: AGE; Age, maximum/old; Age, minimum/young; Calculated; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; Greenland; ICEDRILL; Ice drill; Mass concentration; Mode, grain size; NGRIP; North Greenland Ice Core Project; NorthGRIP; Particle concentration; Sample comment; Sampling/drilling ice; Standard deviation; Uncertainty of fit parameter
    Type: Dataset
    Format: text/tab-separated-values, 9558 data points
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  • 3
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    Dust concentration in the NGRIP ice core (2007)
    PANGAEA
    In:  Supplement to: Ruth, Urs; Bigler, Matthias; Röthlisberger, Regine; Siggaard-Andersen, Marie-Louise; Kipfstuhl, Sepp; Goto-Azuma, Kumiko; Hansson, Margareta E; Johnsen, Sigfús Jóhann; Lu, Huayu; Steffensen, Jørgen Peder (2007): Ice core evidence for a very tight link between North Atlantic and east Asian glacial climate. Geophysical Research Letters, 34, L03706, https://doi.org/10.1029/2006GL027876
    Details
    Publication Date: 2023-04-22
    Description: 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 providing instantaneous climatic feedback. The tight link between North Atlantic and east Asian glacial climate could have amplified changes in the northern polar cell to larger scales. We further find evidence for an early onset of a Younger Dryas-like event in continental Asia, which gives evidence for heterogeneous climate change within east Asia during the last deglaciation.
    Keywords: Age model; Age model, GICC05; Age model, optional; Age model, SS09sea; Calcium, relative; Calculated; Depth, bottom/max; DEPTH, ice/snow; Depth, top/min; Dust concentration; Greenland; ICEDRILL; Ice drill; Laser particle counter, KLOTZ; NGRIP; North Greenland Ice Core Project; NorthGRIP; Sampling/drilling ice
    Type: Dataset
    Format: text/tab-separated-values, 16552 data points
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  • 4
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    Rare earth elements in surface sediment samples from the Atlantic Sector
    PANGAEA
    Details
    Publication Date: 2023-05-12
    Keywords: Area/locality; Cerium; Comment; DEPTH, sediment/rock; Dysprosium; EPICA; Erbium; European Project for Ice Coring in Antarctica; Europium; Gadolinium; Holmium; ICP-Q-MS; Inductively coupled plasma-quadrupole-mass spectrometry; Lanthanum; LATITUDE; LONGITUDE; Lutetium; Neodymium; Praseodymium; Samarium; Sample code/label; Terbium; Thulium; Ytterbium
    Type: Dataset
    Format: text/tab-separated-values, 536 data points
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  • 5
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    Rare earth elements from the Atlantic Sector
    PANGAEA
    In:  Supplement to: Wegner, Anna; Gabrielli, Paolo; Wilhelms-Dick, Dorothee; Ruth, Urs; Kriews, Michael; De Deckker, Patrick; Barbante, Carlo; Cozzi, Giulio; Delmonte, Barbara; Fischer, H (2012): Change in dust variability in the Atlantic sector of Antarctica at the end of the last deglaciation. Climate of the Past, 8(1), 135-147, https://doi.org/10.5194/cp-8-135-2012
    Details
    Publication Date: 2023-06-27
    Description: We present a Rare Earth Elements (REE) record at decadal resolution determined in the EPICA ice core drilled in Dronning Maud Land (EDML) in the Atlantic Sector of the East Antarctic Plateau, covering the transition from the last glacial age (LGA) to the early Holocene (26 600-7500 yr BP). Additionally, samples from potential source areas (PSAs) for Antarctic dust were analysed for their REE characteristics. The dust provenance is discussed by comparing the REE fingerprints in the ice core and the PSAs samples. We find a shift in REE composition at 15 200 yr BP in the ice core samples. Before 15 200 yr BP, the dust composition is very uniform and its provenance was likely to be dominated by a South American source. After 15 200 yr BP, multiple sources such as Australia and New Zealand become relatively more important, albeit South America is possibly still an important dust supplier. A similar change in the dust characteristics was observed in the EPICA Dome C ice core at around ~15 000 yr BP. A return to more glacial dust characteristics between ~8300 and ~7500 yr BP, as observed in the EPICA Dome C core, could not be observed in the EDML core. Consequently, the dust provenance at the two sites must have been different at that time.
    Keywords: EDML; EDRILL; EPICA; EPICA-Campaigns; EPICA drill; EPICA Dronning Maud Land, DML28C01_00; European Project for Ice Coring in Antarctica; Kohnen Station
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 6
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    (Supplement 3) EDML gas chronologies for the different scenarios 1 to 4 (2009)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age model; DEPTH, ice/snow; EDML; EDRILL; EPICA; EPICA-Campaigns; EPICA drill; EPICA Dronning Maud Land, DML28C01_00; European Project for Ice Coring in Antarctica; Gas age; Kohnen Station
    Type: Dataset
    Format: text/tab-separated-values, 9348 data points
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  • 7
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    Stable isotopes, major ions and melt-layer content of the Akademii Nauk ice core (AD 1883-1998) (Figure 6)
    PANGAEA
    In:  Supplement to: Opel, Thomas; Fritzsche, Diedrich; Meyer, Hanno; Schütt, Rainer; Weiler, Karin; Ruth, Urs; Wilhelms, Frank; Fischer, Hubertus (2009): 115 year ice-core data from Akademii Nauk ice cap, Severnaya Zemlya: high-resolution record of Eurasian Arctic climate change. Journal of Glaciology, 55(189), 21-31, https://doi.org/10.3189/002214309788609029
    Details
    Publication Date: 2023-05-12
    Description: From 1999 to 2001 a 724 m deep ice core was drilled on Akademii Nauk ice cap, Severnaya Zemlya, to gain high-resolution proxy data from the central Russian Arctic. Despite strong summertime meltwater percolation, this ice core provides valuable information on the regional climate and environmental history. We present data of stable water isotopes, melt-layer content and major ions from the uppermost 57 m of this core, covering the period 1883-1998. Dating was achieved by counting seasonal isotopic cycles and using reference horizons. Multi-annual d18O values reflect Eurasian sub-Arctic and Arctic surface air-temperature variations. We found strong correlations to instrumental temperature data from some stations (e.g. r = 0.62 for Vardø, northern Norway). The d18O values show pronounced 20th-century temperature changes, with a strong rise about 1920 and the absolute temperature maximum in the 1930s. A recent decrease in the deuterium-excess time series indicates an increasing role of the Kara Sea as a regional moisture source. From the multi-annual ion variations we deduced decreasing sea-salt aerosol trends in the 20th century, as reflected by sodium and chloride, whereas sulphate and nitrate are strongly affected by anthropogenic pollution.
    Type: Dataset
    Format: application/zip, 2 datasets
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  • 8
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    Rare earth elements determined in Antarctic ice by inductively coupled plasma (2008)
    PANGAEA
    In:  Supplement to: Dick, Dorothee; Wegner, Anna; Gabrielli, Paolo; Ruth, Urs; Barbante, Carlo; Kriews, Michael (2008): Rare earth elements determined in Antarctic ice by inductively coupled plasma-Time of flight, quadrupole and sector field-mass spectrometry: An inter-comparison study. Analytica Chimica Acta, 621(2), 140-147, https://doi.org/10.1016/j.aca.2008.05.026
    Details
    Publication Date: 2023-06-27
    Description: Inductively coupled plasma mass spectrometry (ICP-MS) is a suitable tool for multi-element analysis at low concentration levels. Rare earth element (REE) determinations in standard reference materials and small volumes of molten ice core samples from Antarctica have been performed with an ICP-time of flight-MS (ICP-TOF-MS) system. Recovery rates for REE in e.g. SPS-SW1 amounted to not, vert, similar ~103%, and the relative standard deviations were 3.4% for replicate analysis at REE concentrations in the lower ng/l range. Analyses of REE concentrations in Antarctic ice core samples showed that the ICP-TOF-MS technique meets the demands of restricted sample mass. The data obtained are in good agreement with ICP-Quadrupole-MS (ICP-Q-MS) and ICP-Sector Field-MS (ICP-SF-MS) results. The ICP-TOF-MS system determines accurately and precisely REE concentrations exceeding 5 ng/l while between 0.5 and 5 ng/l accuracy and precision are element dependent.
    Keywords: Dome C; Dome C, Antarctica; EDC; EDML; EDRILL; EPICA; EPICA-Campaigns; EPICA Dome C; EPICA drill; EPICA Dronning Maud Land, DML28C01_00; European Project for Ice Coring in Antarctica; ICEDRILL; Ice drill; Kohnen Station
    Type: Dataset
    Format: application/zip, 6 datasets
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  • 9
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    Chronology for the EDML ice core from Dronning Maud Land, Antarctica, over the last 150 000 years (2007)
    PANGAEA
    In:  Supplement to: Ruth, Urs; Barnola, Jean-Marc; Beer, Jürg; Bigler, Matthias; Blunier, Thomas; Castellano, Emiliano; Fischer, Hubertus; Fundel, Felix; Huybrechts, Philippe; Kaufmann, Patrik R; Kipfstuhl, Sepp; Lambrecht, Anja; Morganti, Andrea; Oerter, Hans; Parrenin, Frédéric; Rybak, Oleg; Severi, Mirko; Udisti, Roberto; Wilhelms, Frank; Wolff, Eric William (2007): EDML1: a chronology for the EPICA deep ice core from Dronning Maud Land, Antarctica, over the last 150 000 years. Climate of the Past, 3, 475-484, https://doi.org/10.5194/cp-3-475-2007
    Details
    Publication Date: 2023-06-27
    Description: A chronology called EDML1 has been developed for the EPICA ice core from Dronning Maud Land (EDML). EDML1 is closely interlinked with EDC3, the new chronology for the EPICA ice core from Dome-C (EDC) through a stratigraphic match between EDML and EDC that consists of 322 volcanic match points over the last 128 ka. The EDC3 chronology comprises a glaciological model at EDC, which is constrained and later selectively tuned using primary dating information from EDC as well as from EDML, the latter being transferred using the tight stratigraphic link between the two cores. Finally, EDML1 was built by exporting EDC3 to EDML. For ages younger than 41 ka BP the new synchronized time scale EDML1/EDC3 is based on dated volcanic events and on a match to the Greenlandic ice core chronology GICC05 via 10Be and methane. The internal consistency between EDML1 and EDC3 is estimated to be typically ~6 years and always less than 450 years over the last 128 ka (always less than 130 years over the last 60 ka), which reflects an unprecedented synchrony of time scales. EDML1 ends at 150 ka BP (2417 m depth) because the match between EDML and EDC becomes ambiguous further down. This hints at a complex ice flow history for the deepest 350 m of the EDML ice core.
    Keywords: EDML; EDRILL; EPICA; EPICA-Campaigns; EPICA drill; EPICA Dronning Maud Land, DML28C01_00; European Project for Ice Coring in Antarctica; Kohnen Station
    Type: Dataset
    Format: application/zip, 4 datasets
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  • 10
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    Stable isotopes and major ions of the Akademii Nauk ice core (AD 1883-1998) (Figure 6)
    PANGAEA
    Details
    Publication Date: 2023-06-27
    Keywords: Age; AGE; Akademii Nauk; Akademii Nauk, Severnaya Zemlya, Russian Arctic; AN; AWI Arctic Land Expedition; Calcium; Calculated; Chloride; Deuterium excess; ICEDRILL; Ice drill; Ion chromatograph, Dionex Corporation, IC-20; Magnesium; Mass spectrometer Finnigan Delta-S; Nitrate; RU-Land_1999/2001_SevernayaZemly; Sodium; Sulfate; SZ_1999/2001; δ18O, water; δ Deuterium, water
    Type: Dataset
    Format: text/tab-separated-values, 1160 data points
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