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Items where Author is "Freitag, Johannes"

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Jump to: Article | Inbook | Conference | "Berichte zur Polar- und Meeresforschung" | PANGAEA Documentation

Number of items: 98.

Article

Schaller, C. F. , Freitag, J. and Eisen, O. (2017)
Critical porosity of gas enclosure in polar firn independent of climate ,

Climate of the Past, 13 , pp. 1685-1693 .

doi:https://doi.org/10.5194/cp-13-1685-2017 , hdl:10013/epic.f0a665ac-02f9-4c48-9cc1-a28795ddb0a6

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Article

Münch, T. , Kipfstuhl, S. , Freitag, J. , Meyer, H. and Laepple, T. (2017)
Constraints on post-depositional isotope modifications in East Antarctic firn from analysing temporal changes of isotope profiles ,

The Cryosphere, 11 (5), pp. 2175-2188 .

doi:https://doi.org/10.5194/tc-11-2175-2017 , hdl:10013/epic.51602

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Article

Carlsen, T. , Birnbaum, G. , Ehrlich, A. , Freitag, J. , Heygster, G. , Istomina, L. , Kipfstuhl, S. , Orsi, A. , Schaefer, M. and Wendisch, M. (2017)
Comparison of different methods to retrieve optical-equivalent snow grain size in central Antarctica ,

The Cryosphere, 11 , pp. 2727-2741 .

doi:https://doi.org/10.5194/tc-11-2727-2017

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Article

Karlsson, N. B. , Eisen, O. , Dahl-Jensen, D. , Freitag, J. , Kipfstuhl, S. , Lewis, C. , Nielsen, L. T. , Paden, J. , Winter, A. and Wilhelms, F. (2016)
Accumulation Rates during 1311–2011 CE in North-Central Greenland Derived from Air-Borne Radar Data ,

Frontiers in Earth Science, 4 , p. 97 .

doi:https://doi.org/10.3389/feart.2016.00097 , hdl:10013/epic.48973

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Article

Schaller, C. F. , Freitag, J. , Kipfstuhl, S. , Laepple, T. , Steen-Larsen, H. C. and Eisen, O. (2016)
A representative density profile of the North Greenland snowpack ,

The Cryosphere, 10 (5), pp. 1991-2002 .

doi:https://doi.org/10.5194/tc-10-1991-2016 , hdl:10013/epic.48741

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Article

Münch, T. , Kipfstuhl, S. , Freitag, J. , Meyer, H. and Laepple, T. (2016)
Regional climate signal vs. local noise: a two-dimensional view of water isotopes in Antarctic firn at Kohnen station, Dronning Maud Land ,

Climate of the Past, 12 , pp. 1565-1581 .

doi:https://doi.org/10.5194/cp-12-1565-2016 , hdl:10013/epic.46413

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Article

Ritter, F. , Steen-Larsen, H. C. , Werner, M. , Masson-Delmotte, V. , Orsi, A. , Behrens, M. , Birnbaum, G. , Freitag, J. , Risi, C. and Kipfstuhl, S. (2016)
Isotopic exchange on the diurnal scale between near-surface snow and lower atmospheric water vapor at Kohnen station, East Antarctica ,

The Cryosphere, 10 , pp. 1647-1663 .

doi:https://doi.org/10.5194/tc-10-1647-2016 , hdl:10013/epic.48316

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Article

Laepple, T. , Hörhold, M. , Münch, T. , Freitag, J. , Wegner, A. and Kipfstuhl, S. (2016)
Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? ,

Journal of Geophysical Research: Earth Surface, 121 , pp. 1849-1860 .

doi:https://doi.org/10.1002/2016JF003919 , hdl:10013/epic.48734

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Article

Rhodes, R. H. , Faïn, X. , Brook, E. J. , McConnell, J. R. , Maselli, O. J. , Sigl, M. , Edwards, J. , Buizert, C. , Blunier, T. , Chappellaz, J. and Freitag, J. (2016)
Local artifacts in ice core methane records caused by layered bubble trapping and in situ production: a multi-site investigation ,

Climate of the Past, 12 (4), pp. 1061-1077 .

doi:https://doi.org/10.5194/cp-12-1061-2016 , hdl:10013/epic.49832

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Article

Kronenberger, M. , Wirjadi, O. , Freitag, J. and Hagen, H. (2015)
Gaussian curvature using fundamental forms for binary voxel data ,

Graphical Models, 82 , pp. 123-136 .

doi:https://doi.org/10.1016/j.gmod.2015.06.009 , hdl:10013/epic.51086

Article

Christmann, J. , Müller, R. , Webber, K. , Isaia, D. , Schader, F. , Kipfstuhl, S. , Freitag, J. and Humbert, A. (2015)
Measurement of fracture toughness of polycrystalline bubbly ice from an Antarctic ice core ,

Earth Syst. Sci. Data, 7 , pp. 87-92 .

doi:https://doi.org/10.5194/essd-7-87-2015 , hdl:10013/epic.48956

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Article

Freitag, J. , Kipfstuhl, S. , Laepple, T. and Wilhelms, F. (2013)
Impurity-controlled densification: a new model for stratified polar firn ,

Journal of Glaciology, 59 (218), pp. 1163-1169 .

doi:https://doi.org/10.3189/2013JoG13J042 , hdl:10013/epic.42658

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Article

Hubbard, B. , Tison, J. L. , Philippe, M. , Heene, B. , Pattyn, F. , Malone, T. and Freitag, J. (2013)
Ice shelf density reconstructed from optical televiewer borehole logging ,

Geophysical Research Letters, 40 (22), pp. 5882-5887 .

doi:https://doi.org/10.1002/2013GL058023 , hdl:10013/epic.42690 Item availablity restricted.

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Article

Freitag, J. , Kipfstuhl, S. and Laepple, T. (2013)
Core-scale radioscopic imaging: a new method reveals density-calcium link in Antarctic firn ,

J. Glaciol., 59 (218), pp. 1009-1014 .

doi:https://doi.org/10.3189/2013JoG13J028 , hdl:10013/epic.42155

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

Article

Bendel, V. , Ueltzhöffer, K. J. , Freitag, J. , Kipfstuhl, S. , Kuhs, W. , Garbe, C. S. and Faria, S. H. (2013)
High-resolution variations in size, number and arrangement of air bubbles in the EPICA DML (Antarcitca) ice core ,

Journal of Glaciology, 59 (217), pp. 972-980 .

doi:https://doi.org/10.3189/2013JoG12J245 , hdl:10013/epic.42156

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Article

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

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

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

Article

Linow, S. , Hörhold, M. 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:https://doi.org/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, 325-32 , pp. 93-99 .

doi:https://doi.org/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:https://doi.org/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:https://doi.org/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:https://doi.org/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:https://doi.org/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:https://doi.org/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:https://doi.org/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

EPICA Community Members, T. , Barbante, C. , Barnola, J. M. , Becagli, S. , Beer, J. , Bigler, M. , Boutron, C. , Blunier, T. , Castellano, E. , Cattani, O. , Chappellaz, J. , Dahl-Jensen, D. , Debret, M. , Delmonte, B. , Dick, D. , Falourd, S. , Faria, S. , Federer, U. , Fischer, H. , Freitag, J. , Frenzel, A. , Fritzsche, D. , Fundel, F. , Gabrielli, P. , Gaspari, V. , Gersonde, R. , Graf, W. , Grigoriev, D. , Hamann, I. , Hansson, M. , Hoffmann, G. , Hutterli, M. A. , Huybrechts, P. , Isaksson, E. , Johnsen, S. , Jouzel, J. , Kaczmarska, M. , Karlin, T. , Kaufmann, P. , Kipfstuhl, S. , Kohno, M. , Lambert, F. , Lambrecht, A. , Lambrecht, A. , Landais, A. , Lawer, G. , Leuenberger, M. , Littot, G. , Loulergue, L. , Lüthi, D. , Maggi, V. , Marino, F. , Masson-Delmotte, V. , Meyer, H. , Miller, H. , Mulvaney, R. , Narcisi, B. , Oerlemans, J. , Oerter, H. , Parrenin, F. , Petit, J. R. , Raisbeck, G. , Raynaud, D. , Röthlisberger, R. , Ruth, U. , Rybak, O. , Severi, M. , Schmitt, J. , Schwander, J. , Siegenthaler, U. , Siggaard-Andersen, M. L. , Spahni, R. , Steffensen, J. P. , Stenni, B. , Stocker, T. F. , Tison, J. L. , Traversi, R. , Udisti, R. , Valero-Delgado, F. , van den Broeke, M. R. , van de Wal, R. S. W. , Wagenbach, D. , Wegner, A. , Weiler, K. , Wilhelms, F. , Winther, J. G. and Wolff, E. (2006)
One-to-one coupling of glacial climate variability in Greenland and Antarctica ,

Nature, 444 (7116), pp. 195-198 .

doi:https://doi.org/10.1038/nature05301 , hdl:10013/epic.41684

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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:https://doi.org/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 -Talk

Eisen, O. , Kerch, J. , Eichler, J. , Binder, T. , Bohleber, P. , Freitag, J. , Bons, P. D. and Weikusat, I. (2018)
Extreme spatial variability of crystal fabric in an Alpine ice core - a plea for high-res continuous fabric data on all ice cores ,

22nd Alpine Glaciology Meeting, Chamonix, 1 March 2018 - 2 March 2018 .

hdl:10013/epic.07a27d8e-d78f-4343-94b7-e70bebf8075e

Conference -Invited talk

Freitag, J. (2017)
Computertomografie von Schnee und Eis ,

Heidelberger Bildverarbeitungsforum, Fürth, Germany, 7 March 2017 - 7 March 2017 .

hdl:10013/epic.50623

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Conference -Poster

Carlsen, T. , Belke Brea, M. , Birnbaum, G. , Ehrlich, A. , Freitag, J. , Heygster, G. , Istomina, L. , Humbert, A. , Kipfstuhl, S. , Koenig-Langlo, G. , Orsi, A. , Schaefer, M. and Wendisch, M. (2016)
Spatio-temporal variability of snow surface albedo and grain size derived from airborne and ground-based observations in Antarctica ,

SCAR Open Science Conference, Kuala Lumpur, Malaysia, 22 August 2016 - 26 August 2016 .

hdl:10013/epic.48525

Conference -Talk

Karlsson, N. , Eisen, O. , Nielsen, L. T. , Kipfstuhl, S. , Freitag, J. , Paden, J. , Dahl-Jensen, D. , Winter, A. and Wilhelms, F. (2016)
Accumulation rates from central North Greenland during the past 700yr ,

EGU General Assembly 2016, Vienna, Austria, 17 April 2016 - 22 April 2016 .

hdl:10013/epic.47805

Conference -Talk

Carlsen, T. , Birnbaum, G. , Ehrlich, A. , Freitag, J. , Heygster, G. , Istomina, L. , Kipfstuhl, S. , Orsi, A. , Schaefer, M. and Wendisch, M. (2016)
Observations of snow properties in Antarctica ,

International Radiation Symposium, Auckland, New Zealand, 16 April 2016 - 22 April 2016 .

hdl:10013/epic.47767

Conference -Poster

Karlsson, N. B. , Eisen, O. , Nielsen, L. T. , Kipfstuhl, S. , Freitag, J. , Paden, J. , Dahl-Jensen, D. , Winter, A. and Wilhelms, F. (2016)
Accumulation rates from central North Greenland during the past 700 year ,

Second Open Science Conference of the International Partnerships in Ice Core Sciences (IPICS2016), Hobart, Australia, 17 March 2016 - 22 March 2016 .

hdl:10013/epic.47799

Conference -Poster

Freitag, J. , Schaller, C. , Kipfstuhl, S. , Vinther, B. M. and Svensson, A. (2016)
Bubble observations and analysis of the Renland ice core ,

Second IPICS Open Science Meeting, Hobart, Australia, 7 March 2016 - 11 March 2016 .

hdl:10013/epic.49829

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Conference -Poster

Belke Brea, M. , Birnbaum, G. , Freitag, J. , Kipfstuhl, S. , Humbert, A. , Schaefer, M. , König-Langlo, G. and Loose, B. (2015)
The impact of specific surface area and clouds on surface albedo: Investigations made at Kohnen Station, Antarctica, during summer 2013/2014 ,

26th International Congress on Polar Research, Munich, Germany, 6 September 2015 - 11 September 2015 .

hdl:10013/epic.45957

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Conference -Poster

Carlsen, T. , Belke Brea, M. , Birnbaum, G. , Ehrlich, A. , Freitag, J. , Schaefer, M. and Wendisch, M. (2015)
Airborne and in situ ground-based measurements of surface albedo, bidirectional reflectivity BRDF and snow properties on the Antarctic plateau ,

Koordinationsworkshop DFG-Schwerpunktprogramm 1158 - Antarktisforschung, Frankfurt am Main, 30 September 2015 - 2 October 2015 .

hdl:10013/epic.46081

Conference -Poster

Münch, T. , Kipfstuhl, S. , Freitag, J. , Meyer, H. and Laepple, T. (2015)
Signal vs. Noise: Obtaining a representative d18O record in a low-accumulation region ,

EGU General Assembly 2015, Vienna, Austria, 12 April 2015 - 17 April 2015 .

hdl:10013/epic.45778

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Conference -Poster

Münch, T. , Kipfstuhl, S. , Freitag, J. , Meyer, H. and Laepple, T. (2015)
Signal vs. Noise: Obtaining a representative d18O record in a low-accumulation region ,

36th Meeting of the AWI Scientific Advisory Board (SAB), 6 May 2015 - 7 May 2015 .

hdl:10013/epic.45779

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Conference -Poster

Hörhold, M. , Linow, S. and Freitag, J. (2014)
Accounting for the layering of snow and firn - on the link between density and grain size variability ,

Microstructure in Snow Microwave Radiative Transfer (MICROSNOW) Workshop, University of Reading, 6 August 2014 - 8 August 2014 .

hdl:10013/epic.44265

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Conference -Poster

Klein, K. , Schneebeli, M. , Birnbaum, G. , Reijmer, C. H. and Freitag, J. (2014)
Cascading decrease of the surface snow SSA at Kohnen Station, DML, Antarctica ,

EGU General Assembly 2014, Vienna, 28 April 2014 - 2 May 2014 .

hdl:10013/epic.43620

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Conference -Poster

Freitag, J. , Kipfstuhl, S. , Vinther, B. M. , Popp, T. J. , Hoerz, S. and Eling, L. (2014)
Melt layer statistic of two firn cores recently drilled at Dye3 and South Dome in the dry snow zone of Southern Greenland ,

EGU general assembly, Vienna, Austria, 27 April 2014 - 2 May 2014 .

hdl:10013/epic.49825

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Conference -Poster

Münch, T. , Freitag, J. , Meyer, H. , Kipfstuhl, S. and Laepple, T. (2014)
Two-dimensional insights into the signal formation in low-accumulation firn-cores ,

EGU General Assembly 2014, Vienna, Austria, 27 April 2014 - 2 May 2014 .

hdl:10013/epic.45777

Conference -Talk

Binder, T. , Weikusat, I. , Freitag, J. , Garbe, C. S. , Wagenbach, D. and Kipfstuhl, S. (2013)
Automated microstructure characterization through deep ice cores using sublimation etching ,

5th International Conference on Recrystallization & Grain Growth, Sydney, 5 May 2013 - 10 May 2013 .

hdl:10013/epic.43564

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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 -Invited talk

Freitag, J. , Kipfstuhl, S. , Laepple, T. and Klein, K. (2013)
Modeling delta-age distributions of enclosed air in layered firn ,

PIRE-Firn Workshop, La Jolla, San Diego, USA, 21 September 2013 - 26 September 2013 .

hdl:10013/epic.49845

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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

Freitag, J. , Kipfstuhl, S. , Klein, K. , Wegner, A. , Wilhelms, F. and Bigler, M. (2012)
Shifts in the gas age scales of the EDML and EDC ice cores suggested by a new model for impurity controlled firn densification ,

IPICS International Partnerships in Ice Core Sciences, PresQuile de Giens, France, 1 October 2012 - 5 October 2012 .

hdl:10013/epic.42158

Conference -Poster

Klein, K. and Freitag, J. (2012)
Direct observations of pore close-off in stratified firn by means of large scale X-ray computer tomography ,

Open Science Conference IPICS 2012, Giens, France , 1 October 2012 - 5 October 2012 .

hdl:10013/epic.43619

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Conference -Invited talk

Freitag, J. , Kipfstuhl, S. , Hörhold, M. , Wegner, A. , Wilhelms, F. and Bigler, M. (2012)
Impurity controlled firn densification: a new model approach ,

PIRE Firn workshop, PresQuile de Giens, France, 29 September 2012 - 31 September 2012 .

hdl:10013/epic.42159

Conference -Talk

Freitag, J. , Kipfstuhl, S. , Hörhold, M. , Wegner, A. , Wilhelms, F. and Bigler, M. (2012)
Impurity controlled firn densification ,

EGU Meeting, Vienna, 22 April 2012 - 27 April 2012 .

hdl:10013/epic.42161

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

Preview

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

Preview

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

Preview

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