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Datasets with geocode "DEPTH, ice/snow"

Mostrando recursos 1 - 20 de 1.583

  1. C-axis fabric analysis of ice samples collected from the NEEM ice core

    Eichler, Jan; Weikusat, Ilka; Kipfstuhl, Sepp
    The focus of this Diploma thesis is the development of a new approach for the analysis of crystal orientations in polar ice, based on digital image processing. The c-axes orientations are measured on thin ice sections using automated polarized light microscopy. The measured data are stored in form of high-resolution digital images which have been evaluated only manually so far. The automatic detection of grains and grain boundaries and the extraction of their orientation and shape parameters enable a statistical acquisition of the ice microstructure. The analysis of c-axes distributions, grain sizes, misorientations between adjacent grains, grain boundary orientations etc....

  2. (Fig. 32) Deviation omega_t from the symmetric basal tilt boundary along the NEEM ice core

    Eichler, Jan; Weikusat, Ilka; Kipfstuhl, Sepp

  3. (Fig. 28 ) Fraction of straight grain boundaries along the NEEM ice core

    Eichler, Jan; Weikusat, Ilka; Kipfstuhl, Sepp

  4. (Fig. 27) Difference between adjacent-grains misorientation distribution and Monte-Carlo-simulated pair misorientation distribution along the NEEM ice core

    Eichler, Jan; Weikusat, Ilka; Kipfstuhl, Sepp

  5. (Fig. 21) Orientation-tensor eigenvalues along the NEEM ice core

    Eichler, Jan; Weikusat, Ilka; Kipfstuhl, Sepp

  6. Calcium, dust and nitrate concentrations in monthly resolution in four ice cores from coastal Dronning Maud Land, Antarctica

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Fischer, Hubertus
    Has to be submitted by author.

  7. Calcium, dust and nitrate concentrations in monthly resolution in four ice cores from coastal Dronning Maud Land, Antarctica

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Fischer, Hubertus
    Has to be submitted by author.

  8. Calcium, dust and nitrate concentrations in monthly resolution in ice core DML97C07_04 (FB0704)

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Tijm-Reijmer, Carleen H; Fischer, Hubertus

  9. Calcium, dust and nitrate concentrations in monthly resolution in ice core DML97C07_04 (FB0704)

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Tijm-Reijmer, Carleen H; Fischer, Hubertus

  10. Calcium, dust and nitrate concentrations in monthly resolution in ice core DML96C07_39 (B39)

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Tijm-Reijmer, Carleen H; Fischer, Hubertus

  11. Calcium, dust and nitrate concentrations in monthly resolution in ice core DML96C07_39 (B39)

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Tijm-Reijmer, Carleen H; Fischer, Hubertus

  12. Calcium, dust and nitrate concentrations in monthly resolution in ice core DML95C07_02 (FB0702)

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Tijm-Reijmer, Carleen H; Fischer, Hubertus

  13. Calcium, dust and nitrate concentrations in monthly resolution in ice core DML95C07_02 (FB0702)

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Tijm-Reijmer, Carleen H; Fischer, Hubertus

  14. Calcium, dust and nitrate concentrations in monthly resolution in ice core DML94C07_38 (B38)

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Tijm-Reijmer, Carleen H; Fischer, Hubertus

  15. Calcium, dust and nitrate concentrations in monthly resolution in ice core DML94C07_38 (B38)

    Schmidt, Kerstin; Wegner, Anna; Weller, Rolf; Leuenberger, Daiana; Tijm-Reijmer, Carleen H; Fischer, Hubertus

  16. Measurements of fracture toughness applying a four-point-bending technique of ice core B34 from Kohnen Station, Dronning Maud Land, Antarctica

    Christmann, Julia; Müller, Ralf; Webber, Kyle G; Isaia, Daniel; Schader, Florian H; Kipfstuhl, Sepp; Freitag, Johannes; Humbert, Angelika
    The critical fracture toughness is a material parameter describing the resistance of a cracked body to further crack extension. It is an important parameter to simulate and predict the break-up behaviour of ice shelves from calving of single icebergs to the disintegration of entire ice shelves over a wide range of length scales. The fracture toughness values are calculated with equations that are derived from an elastic stress analysis. Additionally, an X-ray computer tomography (CT scanner) was used to identify the density as a function of depth. The critical fracture toughness of 91 Antarctic inland ice samples with densities between...

  17. (Table 1) Gas tie points used to correlate NorthGRIP and Vostol records

    Landais, Amaelle; Waelbroeck, Claire; Masson-Delmotte, V
    North Atlantic sediment records (MD95-2042), Greenland (Greenland Ice Core Project (GRIP)) and Antarctica (Byrd and Vostok) ice core climate records have been synchronized over marine isotopic stage 3 (MIS 3) (64 to 24 kyr B.P.) (Shackleton et al., 2000). The resulting common timescale suggested that MD95-2042 d18Obenthic fluctuations were synchronous with temperature changes in Antarctica (dDice or d18Oice records). In order to assess the persistency of this result we have used here the recent Greenland NorthGRIP ice core covering the last glacial inception. We transfer the Antarctic Vostok GT4 timescale to NorthGRIP d18Oice and MD95-2042 d18Oplanktonic records and precisely quantify...

  18. (Table 1) Gas tie points used to correlate NorthGRIP and Vostol records

    Landais, Amaelle; Waelbroeck, Claire; Masson-Delmotte, V
    North Atlantic sediment records (MD95-2042), Greenland (Greenland Ice Core Project (GRIP)) and Antarctica (Byrd and Vostok) ice core climate records have been synchronized over marine isotopic stage 3 (MIS 3) (64 to 24 kyr B.P.) (Shackleton et al., 2000). The resulting common timescale suggested that MD95-2042 d18Obenthic fluctuations were synchronous with temperature changes in Antarctica (dDice or d18Oice records). In order to assess the persistency of this result we have used here the recent Greenland NorthGRIP ice core covering the last glacial inception. We transfer the Antarctic Vostok GT4 timescale to NorthGRIP d18Oice and MD95-2042 d18Oplanktonic records and precisely quantify...

  19. Integrated nutrients concentrations calculated for sea-ice core samples during POLARSTERN cruise ARK-XXVII/3 (IceArc) in 2012

    Fernández-Méndez, Mar; Peeken, Ilka; Boetius, Antje

  20. Photosynthetic production in the Central Arctic during POLARSTERN cruise ARK-XXVII/3 (IceArc) in 2012

    Fernández-Méndez, Mar; Rabe, Benjamin; Katlein, Christian; Nicolaus, Marcel; Peeken, Ilka; Boetius, Antje
    The ice-covered Central Arctic Ocean is characterized by low primary productivity due to light and nutrient limitations. It has been speculated that the recent reduction in ice cover could lead to a substantial increase in primary production, but still little is known as to the fate of the ice-associated primary production, and of nutrient supply with increasing warming. This study presents results from the Central Arctic Ocean collected during summer 2012, when sea-ice reached a minimum extent since the onset of satellite observations. Net primary productivity (NPP) was measured in water column, sea ice and melt ponds by 14CO2 uptake...

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