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  • 2020-2022
  • 2000-2004  (30)
  • 2002  (30)
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  • 2020-2022
  • 2000-2004  (30)
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  • 1
    Book
    Book
    Die Expedition ANTARKTIS XVII/2 des Forschungsschiffes POLARSTERN 2000 : = The expedition ANTARKTIS XVII/2 of the research vessel POLARSTERN in 2000 (2002)
    Bremerhaven : Alfred-Wegener-Inst. für Polar- und Meeresforschung
    Details Availability
    Keywords: Oceanography Antarctic Ocean ; Antarktis ; Expedition ; Polarstern ; Fahrtbericht ; Antarktisforschung ; Expedition ; Polarstern
    Type of Medium: Book
    Pages: 245 S. , Ill., graph. Darst., Kt.
    Series Statement: Berichte zur Polar- und Meeresforschung 404
    URL: http://www.gbv.de/dms/tib-ub-hannover/342038141.pdf
    DDC: 551.4617
    RVK:
    RY 20075
    Language: German
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  • 2
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    Shallow firn cores from Neumayer, Ekströmisen - A comparison of accumulation rates and stable isotope ratios (2002)
    In:  EPIC3Annals of Glaciology, 35, pp. 91-96, ISSN: 0260-3055
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 3
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    Temporal variability of accumulation at Neumayer station, Antarctica, from stake array measurements and a regional atmospheric model (2002)
    In:  EPIC3Journal of Glaciology, 48(160), pp. 87-94, ISSN: 0022-1430
    Details
    Publication Date: 2019-07-17
    Description: In this study we investigate the ability of the regional atmospheric model RACMO to represent temporal variations of Antarctic accumulation using weekly stake array measurements from Neumayer Station. The model uses ECMWF reanalyses data to force the atmospheric variables at the lateral boundaries of the model domain. Accumulation is defined as precipitation minus sublimation. Generally the model represents the synoptic situations that lead to precipitation reasonably well. The amounts of accumulation are, however, usually lower in the model than in the measurements. It cannot be distinguished whether the model underestimates precipitation or whether this effect is due to the redistribution of snow by the wind, which is not taken into account in the model, but affects the accumulation at the measuring site. Significant differences between model and measurements also occur in cases of net ablation due to wind erosion or when accumulation was due to snowdrift from southwest without precipitation observed.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 4
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    Glacier specific ablation rate derived by remote sensing measurements (2002)
    In:  EPIC3Geophysical Research Letters, Vol. 29, No. 16P., 4, ISSN: 0094-8276
    Details
    Publication Date: 2019-07-17
    Description: The specific ablation rate in a transect of Storstrømmen, a large outlet glacier from the Northeast Greenland ice sheet, is derived by combining airborne laser altimetry measurements with emergence/submergence velocities derived from satellite synthetic aperture radar inteferometry (InSAR) and airborne ice sounding radar measurement of ice thickness. The results are compared with in situ point observations of ablation measured at poles drilled into the glacier. Considering the different measurement periods for the different data sets, the agreement between derived and observed ablation rates is satisfactory. The new method of deriving specific mass balance, particularly ablation rate, by remote sensing measurements alone has the potential to substantially increase the density of observational based abation rates on ice sheet and ice cap margins.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 5
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    Design, transport, construction, and operation of the summer base Kohnen for ice-core drilling in Dronning Maud Land, Antarctica. (2002)
    Memoirs of National Institute of Polar Research, Special Issue Vol 56, Ed. by Nobuhiko Azuma and Yoshiyuki Fujii.
    In:  EPIC3Ice drilling technology 2000 : Proceedings of the fifth International Workshop on Ice Drilling Technology, 30 October-1 November 2000, Nagaoka University of Technology, Nagaoka, Memoirs of National Institute of Polar Research, Special Issue Vol 56, Ed. by Nobuhiko Azuma and Yoshiyuki Fujii., pp. 302-312, ISSN: 0386-0744
    Details
    Publication Date: 2019-07-17
    Description: During the austral summer seasons 1999/2000 and 2000/2001 the summer base"Kohnen" was built as a platform for the EPICA deep ice core drilling in DronningMaud Land, Antarctica. The design is based on prefabricated container units. Thebase was erected within two summer seasons. Overland traverses with Pistenbullytractors and cargo sledges moved all needed material and base containers from theGerman base Neumayer at the Antarctic coast to the base Kohnen 750 km inland.All installations are completed at the end of the 2000/2001 season including thedrill and science trench with a cased 100-m borehole. Thus everything is preparedto start the deep drilling operation during the 2001/2002 austral summer season.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 6
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    Seasonal variations of accumulation and the isotope record in ice cores: a study with surface snow samples and firn cores from Neumayer station, Antarctica (2002)
    In:  EPIC3Annals of Glaciology, 35, pp. 97-101, ISSN: 0260-3055
    Details
    Publication Date: 2019-07-17
    Description: At the German wintering base Neumayer, an intensive glacio-meteorological program was carried out during the last two decades. A complete meteorological data set and data from surface snow samples, snow pits, firn cores, and weekly accumulation measurements from a stake array are available. We first investigated the attenuation of the seasonal d18O signal due to water vapour diffusion in the snow pack. A comparison of surface snow samples and firn cores of different age shows that only one third of the seasonal d18O signal of the surface snow samples remains in the cores after the first year. No further significant change in the amplitude of the seasonal d18O signal is found later. Changes in the seasonal distribution of accumulation can lead to a bias in ice core properties. This is studied on a short time scale, using the available high-time resolution data of accumulation, stable isotope ratios, and air temperature. Mean annual d18O values from firn cores are not well correlated to annual mean air temperatures. However, the correlation is improved considerably by weighting the annual mean air temperature by accumulation. At Neumayer, mainly the cyclonic activity in late winter/early spring determines whether and how the core data are biased.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 7
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    Comparison between Greenland ice-margin and ice-core oxygen-18 records (2002)
    In:  EPIC3Annals of Glaciology, 35, pp. 136-144
    Details
    Publication Date: 2019-07-17
    Description: Old ice for paleoenvironmental studies retrieved by deep core drilling in the central regions of the big ice sheets can also be retrieved from the ice-sheet margins. The d18O-content of the surface ice was studied at 15 different Greenland ice-margin locations. At some locations, two or more records were obtained along closely spaced parallel sampling profiles, showing good reproducibility of the records. We present ice-margin d18O- records reaching back into the Pleistocene. Many of the characteristic d18O-variations known from Greenland deep ice-cores can be recognized, allowing an approximate time scale to be established along the ice-margin records. A flow line model is used to determine the location on the ice sheet where the margin-ice was originally deposited as snow. The Pleistocene-Holocene d18O-change at the deposition sites is determined by comparing the d18O-values in the ice-margin record to the present _18O-values of the surface snow at the deposition sites. On the northern slope of the Greenland ice sheet, the Pleistocene-Holocene d18O-change is c. 10 per mil in contrast to a change of 6-7 per mil at locations near the central ice divide. This is in accordance with deep ice-core results.We conclude that d18O-records measured on ice from the Greenland ice-sheet margin provide useful information about past climate and dynamics of the ice sheet, and thus are important (and cheap) supplements to deep ice core records.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 8
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    Snow grain size measurements in Antarctica (2002)
    In:  EPIC3Journal of Glaciology, Vol. 48, No. 163, pp. 527-535, ISSN: 0022-1430
    Details
    Publication Date: 2019-07-17
    Description: Grain size is an important but not well known characteristics of snow at the surface of Antarctica. In the past, grain size has been reported using various methods, the reliability, reproducibility and inter comparability of which is not warranted. In this paper, we present and recommend, depending on available logistical support, 3 techniques of snow grain sampling and /or imaging in the field as well as an ariginal digital image processing method, which we have proved to provide reproducible and intercomparable measures of a snow grain size parameter, the mean convex radius. Results from more than 500 samples and 3000 images of snow grains presented, which yield a still spatially limited, yet unprecendtedly wide picture of near-surface snow grain size distribution from field work in Antarctica. In particular, except at sites affected by a very particular meteorology, surface grains in the interior of the ice sheet are uniformly small (o.1 to 0.2 mm). The climate-related increase of grain size with depth through metamorphism is, as expected, not spatially uniform. Our Antarctic snow grain size database will continue to grow as field investigators bring new samples, images and measures of snow grain size.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 9
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    Fracture of Antarctic shelf ice (2002)
    AMER GEOPHYSICAL UNION
    In:  EPIC3Journal of Geophysical Research-Earth Surface, AMER GEOPHYSICAL UNION, 107(B1), 13 p., pp. 2002, ISSN: 0148-0227
    Details
    Publication Date: 2019-07-17
    Description: We have investigated the fracture of Antarctic shelf ice core using two fracture mechanics test methods: the chevron-notched short-rod specimen loaded in tension and the chevron-notched round-bar specimen loaded in three-point bending. These tests have been used to measure the fracture initiation toughness, K init, at which crack growth starts, on samples taken through the entire thickness of the Ronne Ice Shelf, from low-density firn through consolidated meteoric ice to basal marine ice. The fracture data are presented together with depth profiles of relevant physical and mechanical properties derived from the test specimens: temperature, density, elastic modulus, and grain size. It is found that the trend in measured fracture toughness closely reflects changes in ice density and elastic modulus. We augment the experiment study by presenting a fracture mechanics analysis of ice shelf surface and basal crevassing which directly incorporates our measurements. For the examined ice shelf profiles, basal crevasses are found to be inherently unstable unless an external restraining force is imposed, which has important implications for overall ice shelf stability. On the other hand, surface crevassing is shown to be innately stable at depth. Our fracture mechanics model is used to predict local ice shelf back stress in the vicinity of basal crevassing and is validated directly against field observations of crevasse penetration on the Ronne Ice Shelf.
    Repository Name: EPIC Alfred Wegener Institut
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  • 10
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    1000-year ice core records from Berkner Island, Antarctic (2002)
    In:  EPIC3Annals of Glaciology, 35, pp. 45-51
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
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