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  • 2015-2019  (18)
  • 2005-2009  (249)
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  • 1
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    An improved north–south synchronization of ice core records around the 41 kyr 10Be peak (2017)
    Copernicus Publications (EGU)
    In:  Climate of the Past, 13 (3). pp. 217-229.
    Details
    Publication Date: 2018-12-17
    Description: Using new high-resolution 10Be measurements in the NGRIP, EDML and Vostok ice cores, together with previously published data from EDC, we present an improved synchronization between Greenland and Antarctic ice cores during the Laschamp geomagnetic excursion  ∼ 41kyr ago. We estimate the precision of this synchronization to be ±20 years, an order of magnitude better than previous work. We discuss the implications of this new synchronization for making improved estimates of the depth difference between ice and enclosed gas of the same age (Δdepth), difference between age of ice and enclosed gas at the same depth (Δage) in the EDC and EDML ice cores, spectral properties of the 10Be profiles and phasing between Dansgaard–Oeschger-10 (in NGRIP) and AIM-10 (in EDML and EDC).
    Type: Article , PeerReviewed
    Format: text
    Format: archive
    DOI: 10.5194/cp-13-217-2017
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Surface topography and ice flow in the vicinity of the EDML deep-drilling site, Antarctica (2007)
    INT GLACIOL SOC
    In:  EPIC3Journal of Glaciology, INT GLACIOL SOC, 53(182), pp. 442-448, ISSN: 0022-1430
    Details
    Publication Date: 2019-07-16
    Description: Interpretation of ice-core records requires accurate knowledge of the past and present surface topography and stress–strain fields. The European Project for Ice Coring in Antarctica (EPICA) drilling site (75.00258°S, 0.06848°E; 2891.7 m) in Dronning Maud Land, Antarctica, is located in the immediate vicinity of a transient and forking ice divide. A digital elevation model is determined from the combination of kinematic GPS measurements with the GLAS12 datasets from the ICESat. Based on a network of stakes, surveyed with static GPS, the velocity field around the drilling site is calculated. The annual mean velocity magnitude of 12 survey points amounts to 0.74ma–1. Flow directions mainly vary according to their distance from the ice divide. Surface strain rates are determined from a pentagonshaped stake network with one center point close to the drilling site. The strain field is characterized by along-flow compression, lateral dilatation and vertical layer thinning.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 3
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    Auswertung und Interpretation der Oberflächentopographie und -geschwindigkeit des Eisschildes in Dronning Maud Land, Antarktis, aus GPS-Messungen (2005)
    In:  EPIC322. Internationale Polartagung, Jena, Germany, 2005-09-18-2005-09-24
    Details
    Publication Date: 2019-07-16
    Description: Ein Gebiet im Umkreis der Kohnen Station (Dronning Maud Land, Antarktis) wurde mit Hilfe der Kombination von GPS und flugzeuggestützten Altimetermessungen hinsichtlich der Oberflächentopographie und -geschwindigkeit untersucht. Die Topographie der Oberfläche wurde durch die Verknüpfung zweier kinematischer GPS-Messmethoden ermittelt. Das bodengestützte kinematische GPS liefert ein kleinräumiges sehr hochaufgelöstes Höhenmodell (Abstand der Datenpunkte rund 3 m) in der näheren Umgebung der Kohnen Station (0ºW/O und 75ºS). Das untersuchte Messfeld erstreckt sich zwischen 0,5ºW bis 0,8ºO und 75,2ºS bis 75,85ºS. Die weitere Umgebung zwischen 3ºW und 3ºO und 74,5ºS und 75,5ºS wurde mit flugzeuggestützten GPS- und Radaraltimetermessungen untersucht. Die Geschwindigkeit des Flugzeuges ergab einen Abstand der Datenpunkte von rund 100 m. Die Genauigkeit der Radaraltimeterdaten wird durch die Eindringtiefe des Radarsignals und den Roll- und Nickwinkel des Flugzeugs beeinflusst.Die Fliesseigenschaften des Eisschildes an der Oberfläche wurde an 15 Messpunkten ermittelt. Hierzu wurde deren Lage und jährliche Positionsänderung im zweidimensionalen Raum in mehreren Messkampagnen mit statischen GPS-Messung bestimmt. Durch die Verbindung der berechneten Geschwindigkeiten mit der hochaufgelösten Oberflächentopographie kann die Lage der Eisscheide bestimmt werden. Bisher war die Lage der Eisscheide nur auf Basis eines ERS1-Höhenmodells (Auflösung 5 km x 5 km) bekannt. Die genaue Lage der Eisscheide geht in die numerische Modellierung der Eisdynamik im Umfeld der Eiskerntiefbohrung an der Kohnen Station des European Project for Ice Coring in Antarctica (EPICA) ein.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 4
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    Greenland surface mass-balance observations from the ice-sheet ablation area and local glaciers (2016)
    Cambridge Universitiy Press
    In:  EPIC3Journal of Glaciology, Cambridge Universitiy Press, 62(235), pp. 861-887, ISSN: 0022-1430
    Details
    Publication Date: 2016-11-24
    Description: Glacier surface mass-balance measurements on Greenland started more than a century ago, but no compilation exists of the observations from the ablation area of the ice sheet and local glaciers. Such data could be used in the evaluation of modelled surface mass balance, or to document changes in glacier melt independently from model output. Here, we present a comprehensive database of Greenland glacier surface mass-balance observations from the ablation area of the ice sheet and local glaciers. The database spans the 123 a from 1892 to 2015, contains a total of ~3000 measurements from 46 sites, and is openly accessible through the PROMICE web portal (http://www.promice.dk). For each measurement we provide X, Y and Z coordinates, starting and ending dates as well as quality flags. We give sources for each entry and for all metadata. Two thirds of the data were collected from grey literature and unpublished archive documents. Roughly 60% of the measurements were performed by the Geological Survey of Denmark and Greenland (GEUS, previously GGU). The data cover all regions of Greenland except for the southernmost part of the east coast, but also emphasize the importance of long-term time series of which there are only two exceeding 20 a. We use the data to analyse uncertainties in point measurements of surface mass balance, as well as to estimate surface mass-balance profiles for most regions of Greenland.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 5
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    Recent changes in north-west Greenland climate documented by NEEM shallow ice core data and simulations, and implications for past-temperature reconstructions (2015)
    COPERNICUS GESELLSCHAFT MBH
    In:  EPIC3The Cryosphere, COPERNICUS GESELLSCHAFT MBH, 9(4), pp. 1481-1504, ISSN: 1994-0424
    Details
    Publication Date: 2015-08-31
    Description: Combined records of snow accumulation rate, δ18O and deuterium excess were produced from several shallow ice cores and snow pits at NEEM (North Greenland Eemian Ice Drilling), covering the period from 1724 to 2007. They are used to investigate recent climate variability and characterise the isotope–temperature relationship. We find that NEEM records are only weakly affected by inter-annual changes in the North Atlantic Oscillation. Decadal δ18O and accumulation variability is related to North Atlantic sea surface temperature and is enhanced at the beginning of the 19th century. No long-term trend is observed in the accumulation record. By contrast, NEEM δ18O shows multidecadal increasing trends in the late 19th century and since the 1980s. The strongest annual positive δ18O values are recorded at NEEM in 1928 and 2010, while maximum accumulation occurs in 1933. The last decade is the most enriched in δ18O (warmest), while the 11-year periods with the strongest depletion (coldest) are depicted at NEEM in 1815–1825 and 1836–1846, which are also the driest 11-year periods. The NEEM accumulation and δ18O records are strongly correlated with outputs from atmospheric models, nudged to atmospheric reanalyses. Best performance is observed for ERA reanalyses. Gridded temperature reconstructions, instrumental data and model outputs at NEEM are used to estimate the multidecadal accumulation–temperature and δ18O–temperature relationships for the strong warming period in 1979–2007. The accumulation sensitivity to temperature is estimated at 11 ± 2 % °C−1 and the δ18O–temperature slope at 1.1 ± 0.2 ‰ °C−1, about twice as large as previously used to estimate last interglacial temperature change from the bottom part of the NEEM deep ice core.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 6
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    Physical properties of ice sheets: implications for, and findings from a deep ice core drilling and logging (2017)
    In:  EPIC3IceCube Polar Science Workshop – Neutrino-astronomy meets ice drilling and glaciology, Humboldt University, Berlin, 2017-09-30-2017-09-30
    Details
    Publication Date: 2017-10-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 7
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    Antarktis - Forschung im Eiskeller der Erde (2007)
    In:  EPIC3Eröffnung Ausstellung "Antarktis - hitzefrei für Pinguine", Zoo Rostock. Juni 2007., 20
    Details
    Publication Date: 2019-07-17
    Description: Der Vortrag gibt einen allgemeinen Überblick über die Antartkis, Forschungsaktivitäten des AWI, wie weit sich der Klimawandel in der antarktis bemekbar macht und speziell über die Informationen, die wir aus tiefen Eisbohrkernen gewinnen können.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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  • 8
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    Two EPICA ice cores revealing 800,000 years of climate history: an overview. (2008)
    In:  EPIC323. Internationale Polartagung, Dt. Ges. f. Polarforschung, Münster.-14.03.2008., 10
    Details
    Publication Date: 2019-07-17
    Description: Two deep ice cores had been drilled within the European Project for Ice Coring in Antarctica (EPICA). The first core from Dome C reached a depth of 3260 m covering a time period of about 800,000 years. The second core from Dronning Maud Land (DML), drilled at Kohnen-Station, reached 2774 m depth with an estimated age of approximately 300,000 years. Measurements of stable isotopes (oxygen-18, deuterium) reveal climatic variations over 8 glacial cycles. Synchronisation with the deep Greenland ice cores was possible by using the records of methane. A general correspondence was assessed between Dansgaard-Oeschger events in the North and their smoothed Antarctic counterparts, the so-called Antarctic Isotope Maxima (AIM). This was most evident in the DML ice core, as it shows an higher temporal resolution during the past 80,000 years than the Dome C ice core. However, such features with similar amplitude are also present in the deeper part of the Dome C ice core. It is likely that the interplay between obliquity and precession accounts for the variable intensity of interglacial periods in the ice-core records.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    Die Kombination von bodengebundenen, flugzeuggestützten und Satellitendaten zur Bestimmung von Schwerefeld, Magnetfeld, Eismassenhaushalt und Krustenstruktur in Dronning-Maud-Land, Antarktis: Ergebnisse des Forschungsprojektes VISA (2008)
    In:  EPIC323. Internationale Polartagung, Münster.-14. März 2008., 10
    Details
    Publication Date: 2017-10-20
    Description: In Dronning-Maud-Land, Ostantarktis, wurden sowohl Flugzeugmessungen (2001-2005) als auch terrestrische Beobachtungskampagnen (2003/04 und 2004/05) durchgeführt. Die dabei gewonnenen Daten betreffen Höhen und Höhenänderungen, Schwere und Schwereänderungen, Magnetfeld, Seismizität und Glaziologie.Kombiniert man diese mit Satellitendaten, so lassen sich sowohl Vergleiche durchführen als auch Modellverbesserungen bzw. -verdichtungen erreichen. So wurden detaillierte Modelle des regionalen Schwerefelds bzw. Geoids, der Krustenstruktur und Lithosphärendynamik sowie der Dynamik und Massenbilanz des antarktischenEisschildes im Untersuchungsgebiet abgeleitet. Die Bestimmung der raum-zeitlichenMuster von Eismassenänderungen liefert wertvolle Information, um die mittels GRACE abgeleiteten zeitvariablen Schwerefeldinformationenin Hinblick auf antarktische Massenänderungen zu validieren. Hierbei ist es u.a. unabdingbar, zwischen Höhen- und Dichteänderungen des Eiskörpers zu unterscheiden, so daß nur durch eine Kombination der verschiedenen Beobachtungstechniken ein komplettes Bild zu erreichen ist.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 10
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    Forschen in den Polargebieten unserer Erde. (2008)
    In:  EPIC3Grundschule Groß Lessen, Sulingen.2.2008., 18
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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