Items where Author is "Freitag, Johannes"

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Number of items: 62.

Article

Binder, T. , Garbe, C. S. , Wagenbach, D. , Freitag, J. and Kipfstuhl, S. (2013)
Extraction and parametrization of grain boundary networks in glacier ice, using a dedicated method of automatic image analysis ,

Journal of Microscopy, 250 (2), pp. 130-141 .

doi:10.1111/jmi.12029 , hdl:10013/epic.41389

Article

Weikusat, C. , Freitag, J. and Kipfstuhl, S. (2012)
Raman spectroscopy of gaseous inclusions in EDML ice core: First results - microbubbles ,

Journal of Glaciology, INT GLACIOL SOC, 58 (210), pp. 761-766 .

doi:10.3189/2012JoG11J222 , hdl:10013/epic.39700

Article

Linow, S. , Hörhold, M. W. and Freitag, J. (2012)
Grain-size evolution of polar firn: a new empirical grain growth parameterization based on X-ray microcomputer tomography measurements ,

Journal of Glaciology, 58 (212), pp. 1245-1252 .

doi:10.3189/2012JoG11J256 , hdl:10013/epic.40394

Article

Hörhold, M. , Laepple, T. , Freitag, J. , Bigler, M. , Fischer, H. and Kipfstuhl, S. (2012)
On the impact of impurities on the densification of polar firn ,

Earth and Planetary Science Letters, ELSEVIER SCIENCE BV, 325-32 , pp. 93-99 .

doi:10.1016/j.epsl.2011.12.022 , hdl:10013/epic.41153

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Article

Hörhold, M. , Kipfstuhl, S. , Wilhelms, F. , Freitag, J. and Frenzel, A. (2011)
The densification of layered polar firn ,

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 116, F01001PP. , 15 .

doi:10.1029/2009JF001630 , hdl:10013/epic.37133

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Article

Faria, S. H. , Freitag, J. and Kipfstuhl, S. (2010)
Polar ice structure and the integrity of ice-core paleoclimate records ,

Journal of Quaternary Science Reviews, 29 (1-2), Climate of the Last Million Years: New Insights from EPICA and Other Records, pp. 338-351 .

doi:10.1016/j.quascirev.2009.10.016 , hdl:10013/epic.34411

Article

Birnbaum, G. , Freitag, J. , Brauner, R. , König-Langlo, G. , Schulz, E. , Kipfstuhl, S. , Oerter, H. , Reijmer, C. H. , Schlosser, E. , Faria, S. H. , Ries, H. , Loose, B. , Herber, A. , Duda, M. G. , Powers, J. G. , Manning, K. W. and Van den Broeke, M. R. (2010)
Strong-wind events and their influence on the formation of snow dunes: Observations from Kohnen Station, Dronning Maud Land, Antarctica ,

Journal of Glaciology, 56 (199), pp. 891-902 .

hdl:10013/epic.36095

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Article

Redenbach, C. , Särkkä, A. , Freitag, J. and Schladitz, K. (2009)
Anisotropy analysis of pressed point processes ,

Advances in Statistical Analysis, pp. 1-25 .

doi:10.1007/s10182-009-0106-5 , hdl:10013/epic.32441

Article

Kipfstuhl, S. , Faria, S. H. , Azuma, N. , Freitag, J. , Weikusat, I. , Kaufmann, P. , Miller, H. , Weiler, K. and Wilhelms, F. (2009)
Evidence of dynamic recrystallization in polar firn ,

Journal of Geophysical Research, 114, B05204. .

doi:10.1029/2008JB005583 , hdl:10013/epic.34410

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Article

Hörhold, M. , Albert, M. R. and Freitag, J. (2009)
The impact of accumulation rate on anisotropy and air permeability of polar firn at a high accumulation site ,

Journal of Glaciology, 55 (192), pp. 625-630 .

hdl:10013/epic.33525

Article

Freitag, J. , Kipfstuhl, S. and Faria, S. H. (2008)
The connectivity of crystallite agglomerates in low-density firn at Kohnen station, Dronning Maud Land, Antarctica ,

Ann. Glaciol., 49 , pp. 114-120 .

hdl:10013/epic.31526

Article

Abegg, F. , Bohrmann, G. , Freitag, J. and Kuhs, W. (2007)
Fabric of gas hydrate in sediments from Hydrate Ridge - Results from ODP Leg 204 samples. ,

Geo-Marine Letters, 27 , pp. 269-277 .

doi:10.1007/s00367-007-0080-4 , hdl:10013/epic.32431

Article

Landais, A. , Barnola, J. M. , Kawamura, K. , Caillon, N. , Delmotte, M. , Van Ommen, T. , Dreyfus, G. , Jouzel, J. , Masson-Delmotte, V. , Minster, B. , Freitag, J. , Leuenberger, M. , Schwander, J. , Huber, C. , Etheridge, D. and Morgan, V. (2006)
Firn-air d15N in modern polar sites and glacial-interglacial ice: a model-data mismatch during glacial periods in Antarctica? ,

Quaternary science reviews, 25 (1), pp. 49-62 .

doi:10.1016/j.quascirev.2005.06.007 , hdl:10013/epic.25212

Article

Kipfstuhl, S. , Hamann, I. , Lambrecht, A. , Freitag, J. , Faria, S. H. , Grigoriev, D. and Azuma, N. (2006)
Microstructure mapping: a new method for imaging deformation-induced microstructural features of ice on the grain scale ,

Journal of glaciology, 52 (178), pp. 398-406 .

hdl:10013/epic.27838

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Article

Fischer, H. , Freitag, J. , Frenzel, A. , Fritzsche, D. , Fundel, F. , Gersonde, R. , Hamann, I. , Huybrechts, P. , Kipfstuhl, S. , Dick, D. , Meyer, H. , Miller, H. , Oerter, H. , Ruth, U. , Rybak, O. , Schmitt, J. , Valero-Delgado, F. , Wegner, A. and Wilhelms, F. , EPICA community members (2006)
One-to-one coupling of glacial climate variability in Greenland and Antarctica ,

Nature, 444 , pp. 195-198 .

doi:10.1038/nature05301 , hdl:10013/epic.25448

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Article

Freitag, J. , Wilhelms, F. and Kipfstuhl, S. (2004)
Microstructure dependent densification of polar firn derived from X-ray microtomography ,

Journal of glaciology, 50, 169 , pp. 243-250 .

hdl:10013/epic.19834

Article

Eisen, O. , Freitag, J. , Haas, C. , Rack, W. , Rotschky, G. and Schmitt, J. (2003)
Bowling mermaids; or How do fresh water ice balls form? ,

Journal of Glaciology, 49, 167 , pp. 605-606 .

hdl:10013/epic.19024

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Article

Freitag, J. and Eicken, H. (2003)
Meltwater circulation and permeability of Arctic summer sea ice derived from hydrological field experiments ,

Journal of Glaciology, Vol 49, pp. 349-358 .

hdl:10013/epic.15219

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Article

Freitag, J. , Dobrindt, U. and Kipfstuhl, S. (2002)
A new method for predicting transport properties of polar firn with respect to gases on the pore space scale ,

Annals of Glaciology, 35 , pp. 538-544 .

hdl:10013/epic.15220

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Article

Eicken, H. , Kolatschek, J. , Freitag, J. , Lindemann, F. , Kassens, H. and Dmitrenko, I. (2000)
A key source area and constraints on entrainment for basin-scale sediment transport by Arctic sea ice ,

Geophysical Research Letters, 27 (13), pp. 1919-1922 .

hdl:10013/epic.15221

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Inbook

Binder, T. , Weikusat, I. , Freitag, J. , Garbe, C. S. , Wagenbach, D. and Kipfstuhl, S. (2013)
Microstructure through an Ice Sheet / Barnett, M. (editor) ,

In: Recrystallization and Grain Growth V, Materials Science Forum, Zurich, Switzerland, Trans Tech Publications, 590 p., ISBN: 978-3-03785-688-8 .

doi:10.4028/www.scientific.net/MSF.753.481 , hdl:10013/epic.41351

Inbook

Eicken, H. , Weissenberger, J. , Bussmann, I. , Freitag, J. , Schuster, W. , Delgado, F. V. , Evers, K. , Jochmann, P. , Krembs, C. , Gradinger, R. , Lindemann, F. , Cottier, F. , Hall, R. , Wadhams, P. , Reisemann, M. , Kuosa, H. , Ikävalko, J. , Leonard, G. H. , Shen, H. , Ackley, S. and Smedsrud, L. H. (1998)
Ice-tank studies of physical and biological sea-ice processes, in ,

Ice in surface waters, H. Shen, Editor. , Balkema: Rotterdam .

hdl:10013/epic.31852

Conference

Conference -Poster

Birnbaum, G. , Freitag, J. and Klein, K. (2013)
In situ measurements of snow properties and surface albedo at Kohnen Station, East Antarctic Plateau to improve prognostic snow models ,

Snow Grain Size Workshop, Grenoble, France, 2 April 2013 - 5 April 2013 .

hdl:10013/epic.41380

Conference -Poster

Binder, T. , Weikusat, I. , Freitag, J. , Svensson, A. , Wagenbach, D. , Garbe, C. S. and Kipfstuhl, S. (2013)
Properties of grain boundary networks in the NEEM ice core ,

EGU General Assembly 2013, Vienna, 7 April 2013 - 12 April 2013 .

hdl:10013/epic.41354

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Conference -Poster

Weißbach, S. , Wegner, A. , Freitag, J. and Kipfstuhl, S. (2012)
The influence of impurities on the densification of firn -a case study from North Greenland ,

Geophysical Research Abstracts Vol. 14, EGU2012-10143, EGU General Assembly, Vienna, 22 April 2012 - 27 April 2012 .

hdl:10013/epic.39264

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Conference -Poster

Weikusat, C. , Freitag, J. and Kipfstuhl, S. (2011)
Raman spectroscopy of bubbles and microbubbles in EDML antarctic ice core ,

Geophysical Research Abstracts Vol. 13, EGU2011-7178 .

hdl:10013/epic.37353

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Conference -Poster

Behrens, M. , Kipfstuhl, S. and Freitag, J. (2010)
Combining total air content measurements with ice and pore structure investigations on the micro-scale ,

EPICA Science Meeting, 2010, Rome, Italy. .

hdl:10013/epic.35189

Conference -Invited talk

Freitag, J. (2009)
Direkte Beobachtungen und Modellierung des Lufteinschlusses im polaren Eis Neue Erkenntnisse für die Luftaltersbestimmung ,

Seminar der Abt. Klima- und Umweltphysik, Universität Bern. .

hdl:10013/epic.36395

Conference -Talk

Kipfstuhl, S. , Faria, S. H. , Azuma, N. , Freitag, J. and Weikusat, I. (2009)
Dynamic recrystallization in polar firn and ice ,

EGU .

hdl:10013/epic.34440

Conference -Poster

Kipfstuhl, S. , Freitag, J. , Horn, M. , Hörhold, M. and Faria, S. H. (2009)
Grain size in polar firn - what can we learn from high resolution images about grain growth in firn? ,

EGU .

hdl:10013/epic.34441

Conference -Poster

Drews, R. , Bohleber, P. , Eisen, O. , Steinhage, D. , Weikusat, I. , Wilhelms, F. and Freitag, J. (2009)
Imprints of air bubbles and crystal orientation fabric on RES signature ? ,

EGU 2009. .

hdl:10013/epic.33294

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Conference -Talk

Hörhold, M. , Kipfstuhl, S. , Wilhelms, F. and Freitag, J. (2009)
Is the densification of polar firn abnormal ? ,

European Geosciences Union General Assembly 2009 Vienna, Austria 24 April 2009.. .

hdl:10013/epic.32064

Conference -Conference paper

Faria, S. H. , Kipfstuhl, S. , Azuma, N. , Kuhs, W. F. , Freitag, J. , Weikusat, I. , Murshed, M. M. and Klein, H. (2009)
Multiscale Structures in the Antarctic Ice Sheet Part I: Inland Ice ,

Physics of ice core records II / ed. by Takeo Hondoh Sapporo : Hokkaido University Press. (Low Temperature Science, Supplement Issue ; 68) .

hdl:10013/epic.35759

Conference -Poster

Hörhold, M. , Freitag, J. and Kipfstuhl, S. (2009)
Polar Snow and Firn Properties - Examples from a Natural Long -Term-Experiment ,

International Snow Sciences Workshop (ISSW) 27.9. - 2.10. 2009, Davos, Switzerland,. .

hdl:10013/epic.34022

Conference -Poster

Hörhold, M. and Freitag, J. (2008)
Why do we care about snow pore structure? ,

Knowledge Based Materials 4th Marie Curie Summer School, Porous and Aquerous Materials, 19. - 29.8.2008, Trest, Chech Republic. .

hdl:10013/epic.34029

Conference -Poster

Freitag, J. , Kipfstuhl, S. and Hörhold, M. (2008)
The layered structure of firn and its effect on air entrapment ,

EPICA Science conference, Venice 11.-13.11.2008. .

hdl:10013/epic.31596

Conference -Invited talk

Freitag, J. (2008)
The layering of polar firn and its linkage to air trapping ,

Workshop on the mircostructure and properties of firn, 10-11.3.2008 Dartmouth College, Hanover, USA. .

hdl:10013/epic.31357

Conference -Poster

Freitag, J. , Kipfstuhl, S. and Faria, S. (2007)
3D-X-ray micro tomography and 2D-microstructure mapping of polar firn - a comprehensive picture by two complementary methods? ,

International symposium on snow science, IGS, MoscowSeptember 2007. .

hdl:10013/epic.27907

Conference -Poster

Lautensack, C. , Särkkä, A. , Schladitz, K. and Freitag, J. (2007)
Anisotropy analysis of the system of air pores in polar ice ,

14th Workshop on Stochastic Geometry, Stereology and Image Analysis, 23-28. September 2007, Neudietendorf, Germany. .

hdl:10013/epic.27950

Conference -Poster

Freitag, J. , Kipfstuhl, S. and Lambrecht, A. (2007)
Direct observations and model calculations of air trapping in polar ice ,

EGU ViennaApril 2007. .

hdl:10013/epic.27905

Conference -Invited talk

Freitag, J. (2007)
Eis und Kälte - Der Arbeitsalltag eines Polarforschers ,

Oberstufenzentrum KSA, Bremen, Beitrag zum Profilthema Polarforschung in Geographie, Deutsch und Darstellendem Spiel.2.2007. .

hdl:10013/epic.26401

Conference -Poster

Abegg, F. , Freitag, J. , Pape, T. , Bahr, A. , Klapp, S. and Bohrmann, G. (2007)
Fabric and depth distribution of gas hydrate in the shallow sub-seafloor of the Batumi Seep area offshore Georgia, Eastern Black Sea. ,

GV-Tagung: The Oceans in the Earth System, BremenOctober 2007. .

hdl:10013/epic.27892

Conference -Poster

Freitag, J. , Kipfstuhl, S. and Faria, S. (2007)
In Situ X-Ray-micro-tomography of snow at the EPICA-Drill Site Dronning Maud Land (DML) Antarctica ,

EGU ViennaApril 2007. .

hdl:10013/epic.27906

Conference -Invited talk

Hamann, I. , Kipfstuhl, S. , Faria, S. H. and Freitag, J. (2007)
Microstructures in the EPICA DML ice core, Antarctica - sub-grain boundary statistics ,

The 2nd International Workshop on Physics of Ice Core Records (PICR-2), February 2 6, 2007, Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan. .

hdl:10013/epic.26579

Conference -Poster

Birnbaum, G. , Freitag, J. , Brauner, R. , König-Langlo, G. and Tijm-Reijmer, C. (2007)
Starkwindereignisse und ihr Einfluss auf die Bildung von Schneedünen auf dem antarktischen Plateau von Dronning Maud Land ,

DACH Meteorologentagung, 10-14 Sept., Hamburg. .

hdl:10013/epic.27712

Conference -Talk

Birnbaum, G. , Brauner, R. , Freitag, J. , König-Langlo, G. and Tijm-Reijmer, C. (2007)
Strong Wind and Heavy Precipitation Events on the Antarctic plateau: Observations from Kohnen Station, Dronning Maud Land ,

2nd Antarctic Meteorological Observation, Modeling, and Forecasting Workshop, 26-28 June, Rome, Italy. .

hdl:10013/epic.26870

Conference -Invited talk

Freitag, J. (2007)
Von Schnee zu Eis - Anwendungen der Röntgen Mikro-Computer-Tomographie in der Antarktis ,

Arbeitskreis "Bildanalyse und Mustererkennung Kaiserslautern" (BAMEK) IWTM-Fraunhofer-Institut.2.2007. .

hdl:10013/epic.26400

Conference -Invited talk

Freitag, J. (2006)
Anwendung der Röntgen-Mikro-Computertomographie in der Antarktis - das polare Eisschild als poröses Medium ,

Sect. of Crystallography, GZG, University of Göttingen.11.2006. .

hdl:10013/epic.25931

Conference -Talk

Wilhelms, F. , Freitag, J. , Faria, S. H. , Oerter, H. , Miller, H. , Kipfstuhl, S. , Ruth, U. , Huybrechts, P. , Hamman, I. , Fritzsche, D. , Lawer, G. , Frenzel, A. , Dick, D. , Karlin, T. , Kaufmann, P. , Lambrecht, A. , Rybak, O. , Twarloh, B. and Valero-Delgado, F. (2006)
Both EPICA cores completed: Is the little sister the elder one? ,

European Geosciences Union General Assembly 2006 Vienna, Austria 07 April 2006. .

hdl:10013/epic.25469

Conference -Poster

Weiler, K. , Schwander, J. , Nyfeler, P. , Leuenberger, M. , Kaufmann, P. , Stoof, G. , Trimborn, K. , Freitag, J. and Kipfstuhl, S. (2006)
Firnair sampling at Kohnen Station, Antarctica: estimation of the age difference between air and ice from CO2-data ,

EGU, Vienna 2006. .

hdl:10013/epic.25170

Conference -Poster

Hamann, I. , Faria, S. H. , Freitag, J. , Kipfstuhl, S. and Lambrecht, A. (2006)
Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica ,

11th International Conference on the Physics and Chemistry of Ice PCI 2006 Bremerhaven, Germany, July 23rd28th .

hdl:10013/epic.25642

Conference -Poster

Freitag, J. , Kipfstuhl, S. and Faria, S. H. (2006)
The firnification of snow measured by X-Ray-micro-tomography at the EPICA-Drill site Dronning Maud Land (DML), Antarctica ,

11th International Conference on the Physics and Chemistry of Ice, PCI, Bremerhaven, Germany.7.-28.7.2006. .

hdl:10013/epic.25932

Conference -Poster

Kipfstuhl, S. , Freitag, J. , Hamann, I. , Lambrecht, A. and Ruth, U. (2005)
Cloudy bands and their microstructure in the EPICA-DML ice core ,

. .

hdl:10013/epic.23149

Conference -Poster

Ruth, U. , Freitag, J. , Kaufmann, P. , Kipfstuhl, S. , Raynaud, D. , Lipenkov, V. and Lemieux, B. (2005)
Continuous Measurements of Air Content: First Results from the EDML Ice Core, Antarctica and comparison to EDC ,

General Assembly of the European Geosciences Union, 24.-29.04.2005 Vienna, Austria. .

hdl:10013/epic.22584

Conference -Invited talk

Freitag, J. (2005)
Der Übergang von offener zu geschlossener Porosität in Eisstrukturen, Analyse von Volumenbildern der Mikrostruktur von Werkstoffen, 17 Feb., Kaiserslautern, Deutschland ,

. .

hdl:10013/epic.22593

Conference -Poster

Ruth, U. , Freitag, J. , Kaufmann, P. , Kipfstuhl, S. and Raynaud, D. (2004)
Continuous measurements of air content: first results from the EDML ice core, Antarctica ,

AGU Fall Meeting 13-17 Dec. 2004 San Francisco USA. .

hdl:10013/epic.22143

Conference -Poster

Freitag, J. , Wilhelms, F. and Kipfstuhl, S. (2004)
The influence of stratigraphic features on gas diffusion and pore close-off in dry polar firn ,

EGS-conference, 25-30 April, Nice, France. .

hdl:10013/epic.21564

Conference -Talk

Freitag, J. (2003)
Gespür für Schnee Anwendungen der Röntgen-Computer-Tomographie in der Polarforschung ,

12th Workshop 'Quantitative Image Analysis', 16 May, Darmstadt, Germany. .

hdl:10013/epic.19254

Conference -Poster

Freitag, J. , Wilhelms, F. and Kipfstuhl, S. (2003)
Particle size dependent densification rates lead to minimum in density fluctuations of polar firn ,

EGS-AGU-EUG, 7-11 April, Nice, France. .

hdl:10013/epic.19253

Conference -Poster

Eicken, H. , Pfirman, S. , Krouse, H. R. , Haas, C. , Freitag, J. and Mackensen, A. (1999)
Tracer studies of Arctic sea-ice growth and ablation ,

IUGG-Tagung, Birmingham, UK. .

hdl:10013/epic.20297