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Items where Author is "Helm, Veit"

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Article

Article
Price, D. , Beckers, J. M. , Ricker, R. , Kurtz, N. , Rack, W. , Haas, C. , Helm, V. , Hendricks, S. , Leonard, G. and Langhorn, P. , Gateway Antarctica, University of Canterbury, Christchurch, New Zealand, Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta, Canada, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany, Cryospheric Sciences Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, USA, Department of Earth, Space Science and Engineering, York University, Toronto, Ontario, Canada, School of Surveying, University of Otago, Dunedin, New Zealand, Department of Physics, University of Otago, Dunedin, New Zealand (2015)
Evaluation of CryoSat-2 derived sea-ice freeboard over fast ice in McMurdo Sound, Antarctica ,
Journal of Glaciology, 61 (226), pp. 285-300 .
doi:10.3189/2015JoG14J157 , hdl:10013/epic.45308

Article
Ricker, R. , Hendricks, S. , Helm, V. , Skourup, H. and Davidson, M. (2014)
Sensitivity of CryoSat-2 Arctic sea-ice freeboard and thickness on radar-waveform interpretation ,
The Cryosphere, 8 (4), pp. 1607-1622 .
doi:10.5194/tc-8-1607-2014 , hdl:10013/epic.44049
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Article
Helm, V. , Humbert, A. and Miller, H. (2014)
Elevation and elevation change of Greenland and Antarctica derived from CryoSat-2 ,
The Cryosphere, 8 (4), pp. 1539-1559 .
doi:10.5194/tc-8-1539-2014 , hdl:10013/epic.44098
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Article
HAWLEY, R. L. , BRANDT, O. , DUNSE, T. , HAGEN, J. O. , Helm, V. , KOHLER, J. , LANGLEY, K. , MALNES, E. and HØGDA, K. A. (2013)
Using airborne Ku-band altimeter waveforms to investigate winter accumulation and glacier facies on Austfonna, Svalbard ,
Journal of Glaciology, 59 (217), pp. 893-899 .
doi:10.3189/2013JoG13J051 , hdl:10013/epic.42037

Article
Helm, V. , Drews, R. , Steinhage, D. and Neckel, N. (2011)
Validierung von CryoSat-2 Datenprodukten – Genauigkeit und Eindringverhalten ,
Rundtischgespräch: Georadar - Erfahrungen und Perspektiven, Freiberg . 6. + 7. Okt. 2011, Mitteilungen Sonderband I/2011 .
hdl:10013/epic.39265
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Article
Willat, R. , Laxon, S. , Giles, K. , Cullen, R. , Haas, C. and Helm, V. (2011)
Ku-band radar penetration into snow cover on Arctic sea ice using airborne data ,
Annals of Glaciology, 52 (57), pp. 197-205 .
hdl:10013/epic.37028
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Article
de la Peña, S. , Nienow, P. , Shepherd, A. , Helm, V. , Mair, D. , Hanna, E. , Huybrechts, P. , Guo, Q. , Cullen, R. and Wingham, D. (2010)
Spatially extensive estimates of annual accumulation in the dry snow zone of the Greenland Ice Sheet determined from radar altimetry ,
The Cryosphere 4, pp. 467-474 .
doi:10.5194/tc-4-467-2010 , hdl:10013/epic.36407
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Article
Hvidegaard, S. M. , Forsberg, R. , Helm, V. , Hendricks, S. , Skourup, H. , Stenseng, L. , Hanson, S. and Haas, C. (2009)
CRYOVEX 2008 - Final Report ,
DTU Space, Technical Report 2/2009. .
hdl:10013/epic.35790
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Article
Helm, V. , Steinhage, D. , Dietrich, R. and Rülke, A. (2009)
CryoVEx08/09-Antarctica Data Acquisition and Final Processing Report ,
Alfred Wegener Institute, Bremerhaven, Germany. .
hdl:10013/epic.35779
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Article
Hawley, R. L. , Sheperd, A. , Cullen, R. , Helm, V. and Wingham, D. J. (2009)
Ice-sheet elevations from across-track processing of airborne interferometric radar altimetry ,
Geophysical Research Letters., 36 (L22501) .
doi:10.1029/2009GL040416 , hdl:10013/epic.33644

Article
Drews, R. , Rack, W. , Wesche, C. and Helm, V. (2009)
A spatially adjusted elevation model in Dronning Maud Land, Antarctica, based on differential SAR Interferometry ,
IEEE Transactions on Geoscience and Remote Sensing, 47 (8), pp. 2501-2509 .
doi:10.1109/TGRS.2009.2016081 , hdl:10013/epic.33171

Article
Dunse, T. , Eisen, O. , Helm, V. , Rack, W. , Steinhage, D. and Parry, V. (2008)
Characteristics and small-scale variability of GPR signals and their relation to snow accumulation in Greenland's percolation zone ,
Journal of Glaciology, 54 (185), pp. 333-342 .
hdl:10013/epic.31451

Article
Helm, V. and Steinhage, D. (2008)
CryoVEx 2007 - Data Acquisition and Final Processing Report ,
Alfred Wegener Institute, Bremerhaven, Germany. .
hdl:10013/epic.35791
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Article
Stenseng, L. , Hvidegaard, S. M. , Skourup, H. , Forsberg, R. , Andersen, C. J. , Hanson, S. , Cullen, R. and Helm, V. (2007)
Airborne Lidar and Radar Measurements In and Around Greenland CryoVEx 2006 ,
Danish National Space Center Technical Report 9 .
hdl:10013/epic.33645
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Article
Helm, V. , Rack, W. , Cullen, R. , Nienow, P. , Mair, D. , Parry, V. and Wingham, D. J. (2007)
Winter accumulation in the percolation zone of Greenland measured by airborne radar altimeter ,
Geophys. Res. Lett, 34, L06501. .
doi:10.1029/2006GL029185 , hdl:10013/epic.27029

Article
Helm, V. , Hendricks, S. , Göbell, S. , Rack, W. , Haas, C. , Nixdorf, U. and Boebel, T. (2006)
CryoVEx 2004 and 2005 (BoB) data acquisition and final report ,
Alfred Wegener Institute, Bremerhaven, Germany. .
hdl:10013/epic.34417
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Article
Jokat, W. , Berger, D. , Bohlmann, H. , Helm, V. , Hensch, M. , Jousselin, D. , Klein, C. , Lensch, N. , Liersch, P. , Martens, H. , Medow, A. , Micksch, U. , Rabenstein, L. , Rogenhagen, J. , Salat, C. , Schmidt-Aursch, M. C. and Schwenk, A. (2004)
Marine Geophysics, The Expedition ARKTIS XIX/4 of the Research Vessel POLARSTERN in 2003, Reports of Legs 4a and 4b ,
Berichte zur Polar- und Meeresforschung, 475 , pp. 11-37 .
hdl:10013/epic.21300

Article
Jokat, W. , Berger, D. , Helm, V. , Kunsch, B. , Lensch, N. , Martens, H. , Rogenhagen, J. , Salat, C. , Schmidt-Aursch, M. C. , Schubert, B. , Traub, B. and Wollny, K. (2003)
Geophysical investigations ,
Die Expedition ARKTIS XVIII/2 mit FS Polarstern, 2002, Berichte zur Polarforschung, 449 , pp. 8-32 .
hdl:10013/epic.19662

Inbook

Inbook
Ricker, R. , Hendricks, S. , Helm, V. and Gerdes, R. (2015)
Classification of CryoSat-2 Radar Echoes / Lohmann, G. , Meggers, H. , Unnithan, V. , Wolf-Gladrow, D. , Notholt, J. and Bracher, A. (editors) ,
In: Towards an Interdisciplinary Approach in Earth System Science, (Springer Earth System Sciences), Heidelberg [u.a.], Springer International Publishing, 251 p., ISBN: 978-3-319-13864-0 .
doi:10.1007/978-3-319-13865-7_17 , hdl:10013/epic.45046
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Thesis

Thesis -PhD
Helm, V. (2008)
Airborne SAR / Interferometric Radar Altimeter System (ASIRAS) - Kalibrierung, Validierung und Interpretation der Messergebnisse ,
PhD thesis, Universittät Bremen.
hdl:10013/epic.33643
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Thesis -Diplom
Helm, V. (2003)
Die Struktur des Kontinentalrandes im Gebiet des Larsenschelfes, Antarktische Halbinsel ,
Diplom thesis, Technische Universität Bergakademie Freiberg.
hdl:10013/epic.28534
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Conference

Conference -Talk
Helm, V. , Eagles, G. , Müller, C. , Binder, T. , Kässbohrer, J. , Drews, R. , Lenaerts, J. , Steinhage, D. and Eisen, O. (2015)
Circular surface depression on Roi Baudoin Ice Shelf, Dronning Maud Land, East Antarctica - characteristics and possible origin ,
European Geophysical Union, 12 April 2015 - 15 April 2015 .
hdl:10013/epic.45044

Conference -Talk
Simonsen, S. B. , Sørensen, L. S. , Nilsson, J. , Helm, V. , Langley, K. , Forsberg, R. , Hvidegaard, S. M. and Skourup, H. (2015)
Validating Cryosat-2 elevation estimates with airborne laser scanner data for the Greenland ice sheet, Austfonna and Devon ice caps ,
EGU General Assembly 2015, Vienna, Austria, 12 April 2015 - 17 April 2015 .
hdl:10013/epic.45313

Conference -Talk
Helm, V. (2015)
CryoSat-2 QWG 6, Land Ice Validation ,
CryoSat-2 QWG 6, Mullard Space Science Laboratory, Dorking, UK , 16 March 2015 - 19 March 2015 .
hdl:10013/epic.45314

Conference -Talk
Hendricks, S. , Ricker, R. , Helm, V. , Haas, C. and Davidson, M. (2014)
Uncertainties of Sea Ice Thickness from CryoSat-2 ,
International Sea Ice Concentration and Thickness Evaluation and Intercomparison Workshop, University of Hamburg, 19 September 2014 - unspecified .
hdl:10013/epic.45047
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Conference -Poster
Obu, J. , Lantuit, H. , Fritz, M. , Grosse, G. , Sachs, T. and Helm, V. (2014)
Short-term geomorphic dynamics of the Yukon and Herschel Island coasts based on LIDAR DEMs from 2012 and 2013 ,
EUCOP4 European Conference on Permafrost, Evora, Portugal, 19 June 2014 - 21 June 2014 .
hdl:10013/epic.43741
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Conference -Talk
Obu, J. , Lantuit, H. , Fritz, M. , Heim, B. , Myers-Smith, I. , Sachs, T. and Helm, V. (2014)
Soil organic carbon and total nitrogen on the Herschel Island ,
CAPP workshop, Stockholm University, 12 May 2014 - 14 May 2014 .
hdl:10013/epic.44435
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Conference -Talk
Goeller, S. , Thoma, M. , Grosfeld, K. , Helm, V. and Miller, H. (2014)
Dynamics and mass export of the Ross Ice Streams in West Antarctica, triggered by subglacial hydrological processes ,
REKLIM Workshop, Bad Salzschlirf, Germany, 31 March 2014 - 2 April 2014 .
hdl:10013/epic.43383
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Conference -Poster
Helm, V. , Langhammer, L. and Steinhage, D. (2013)
Ku-Band penetration obtained from airborne radar and laser altimetry and TerraSAR-X in a blue ice area in Antarctica ,
Earth Observation and Cryosphere Science Conference, 13 November 2012 - 16 November 2012 .
hdl:10013/epic.39703

Conference -Talk
Hendricks, S. , Ricker, R. , Helm, V. , Haas, C. , Skourup, H. , Herber, A. , Schwegmann, S. , Gerdes, R. and Davidson, M. (2013)
CryoSat-2 Sea-Ice Freeboard and Thickness ,
ESA Living Planet Symposium, Edinburgh, 9 September 2013 - 13 September 2013 .
hdl:10013/epic.42309
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Conference -Talk
Hendricks, S. , Ricker, R. , Helm, V. , Schwegmann, S. , Haas, C. and Herber, A. (2013)
Mass balance of sea ice in both hemispheres ,
CryoSat Third User Workshop, Dresden, 12 March 2013 - 14 March 2013 .
hdl:10013/epic.42310
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Conference -Talk
Ricker, R. , Hendricks, S. , Helm, V. , Gerdes, R. and Skourup, H. (2012)
Comparison Of Sea-Ice Freeboard And Thickness Distributions From Aircraft Data And Cryosat-2 ,
Earth Observation & Cryospehere Science Conference, ESRIN, Frascati, Italy, 13 November 2012 - 16 November 2012 .
hdl:10013/epic.40969
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Conference -Talk
Langley, K. , Patel, A. , Hawley, R. , Dunse, T. , Hagen, J. , Kohler, J. , Skourup, H. , Gogineni, S. , Forsström, S. , Eiken, T. , Leuschen, C. and Helm, V. (2012)
CryoSat cal/val activities on Austfonna – Part II: Ground-based measurements using a Ku-band radar, for validation of the CryoSat-2 SIRAL data ,
Earth Observation and Cryosphere Science Conference, 13 November 2012 - 16 November 2012 .
hdl:10013/epic.39705

Conference -Talk
Wang, C. , Renner, A. , Gerland, S. , Anfinsen, S. , Brandt, O. , Doulgeris, A. , Dumont, M. , Eltoft, T. , Fors, A. , Granskog, M. , Haapala, J. , Helm, V. , Hendricks, S. , Hudson, S. , Hughes, N. , Lensu, M. , Li, Z. , Moen, M. , Sandven, S. , Skourup, H. , Spreen, G. and Zygmuntowska, M. (2012)
In-situ calibration and validation of CryoSat-2 observations over Arctic first year sea ice north of Svalbard ,
Earth Observation and Cryosphere Science Conference, 13 November 2012 - 16 November 2012 .
hdl:10013/epic.39704

Conference -Poster
Ricker, R. , Hendricks, S. , Helm, V. , Gerdes, R. and Skourup, H. (2012)
A Comparison of Sea-Ice Freeboard Distributions from Aircraft Data and CryoSat-2 ,
20 Years of Progress in Radar Altimetry, Venice, Italy, 24 September 2012 - 29 September 2012 .
hdl:10013/epic.40122
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Conference -Poster
Helm, V. , Drews, R. , Neckel, N. , Knöfel, C. and Steinhage, D. (2012)
CryoSat Cal/Val – Accuracy and Penetration Depth of the CryoSat SARIn product ,
20 Years of Progress in Radar Altimetry, Venice, 24 September 2012 - 29 September 2012 .
hdl:10013/epic.39707

Conference -Conference paper
Helm, V. , Steinhage, D. and Miller, H. (2012)
CRYOSAT Cal/Val activities using the airborne ASIRAS Ku-band system ,
IGARSS 2012, München, 22 July 2012 - 27 July 2012 .
hdl:10013/epic.39706

Conference -Invited talk
Helm, V. and Hendricks, S. (2012)
Eine eisige Mission - Mit CryoSat-2 den Änderungen in den Polargebieten auf der Spur ,
Die Erde im Visier - Sonderausstellung, GEOMAR, Kiel, 15 May 2012 - 24 August 2012 .
hdl:10013/epic.39702

Conference -Talk
Helm, V. (2012)
CryoVEx 2011 - Final Meeting ,
CryoVEx 2011 - Final Meeting, ESA - ESRIN, Frascati, Italy .
hdl:10013/epic.38736
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Conference -Talk
Hendricks, S. , Helm, V. , Herber, A. and Haas, C. (2012)
CryoVEx 2011, Airborne Validation Campaign ,
CryoVEx 2011 Final Meeting .
hdl:10013/epic.38684
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Conference -Talk
Helm, V. and Steinhage, D. (2012)
CryoVExANT-2011 - Data Acquisition Report ,
CryoVEx 2011 - Final Meeting, ESA - ESRIN, Frascati, Italy .
hdl:10013/epic.38737
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Conference -Talk
Helm, V. , Drews, R. , Neckel, N. and Diez, A. (2011)
Validierung von CryoSat-2 -- Genauigkeit und Eindringverhalten ,
9. RTG Georadar, Freiberg, Germany .
hdl:10013/epic.38735
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Conference -Talk
Helm, V. and Hendricks, S. (2011)
Accuracy of surface elevation derived from ASIRAS and CryoSat ,
2nd CryoSat Validation workshop. .
hdl:10013/epic.36855
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Conference -Invited talk
Krumpen, T. , Helm, V. , Hendricks, S. , Steinhage, D. , Nicolaus, M. and Dierking, W. (2011)
Calibration and Validation of CryoSat-2 and TanDEM-X elevation products of land and sea ice by using airborne and field data ,
TanDEM-X Science MeetingFeb. 2011. .
hdl:10013/epic.37105

Conference -Poster
Hendricks, S. , Helm, V. , Stenseng, L. and Haas, C. (2011)
Ku-Band radar penetration into Snow over Arctic sea ice ,
2nd CryoSat Validation Workshop. .
hdl:10013/epic.36883
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Conference -Talk
Hendricks, S. , Haas, C. , Stenseng, L. and Helm, V. (2011)
Validation of CryoSat-2 sea ice freeboard retrievals by ground and airborne surveys ,
IUGG XXV General Assembly, Melbourne. .
hdl:10013/epic.38285
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Conference -Invited talk
Helm, V. (2010)
CryoSat-2, ESA's Mission to Ice ,
Koordinations-Workshop SPP 1257, Dipperz, Germany. .
hdl:10013/epic.35778
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Conference -Conference paper
Hendricks, S. , Stenseng, L. , Helm, V. and Haas, C. (2010)
Effects of Surface Roughness on Sea Ice Freeboard Retrieval with an Airborne Ku-Band SAR Radar Altimeter ,
Geoscience and Remote Sensing (IGARSS 2010), IEEE International Symposium. .
hdl:10013/epic.38266

Conference -Conference paper
Sandberg Sørensen, L. , Stenseng, L. , Simonsen, S. B. , Forsberg, R. , Poulsen, S. K. and Helm, V. (2010)
Greenland Ice Sheet changes from space using laser, radar and gravity. ,
ESA Living Planet 2010, ESA Special Publication SP-686. .
hdl:10013/epic.38270
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Conference -Talk
Helm, V. , Hendricks, S. , Steinhage, D. and Rülke, A. (2009)
Accuracy of surface elevation derived from ASIRAS ,
Joint CryoSat-IceSat Science Team meeting, Reykjavik, Iceland. .
hdl:10013/epic.33472
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Conference -Talk
Helm, V. (2009)
Akkumulationsbestimmung mit Hilfe eines flugzeuggetragenen KU-Band-Radaraltimetersystems ,
Rundtisch-Gespräch Georadar (RTG-8), Freiberg, Germany. .
hdl:10013/epic.33448
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Conference -Talk
Helm, V. , Hendricks, S. , Steinhage, D. and Rülke, A. (2009)
CryoSat-2 Cal/Val Aktivitäten über Landeis ,
CryoSat Nutzerworkshop, AWI Bremerhaven, Germany. .
hdl:10013/epic.35774
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Conference -Talk
Helm, V. (2009)
CryoSat-2, ESA's Mission to Ice ,
Koordinations-Workshop SPP 1158, Hamburg, Germany. .
hdl:10013/epic.33473
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Conference -Talk
Helm, V. (2009)
CryoVEx 2008 - Analysis of ASIRAS Level_1b product ,
CryoVEx 2008 Final Meeting, ESA - ESTEC, Noordweijk, The Netherlands. .
hdl:10013/epic.33474
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Conference -Talk
Helm, V. (2009)
CryoVEx08/09 Antarctica - Final presentation ,
CryoVEx08/09 Antarctica Final meeting, ESA - ESTEC Noordweijk, The Netherlands. .
hdl:10013/epic.33906
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Conference -Talk
Hendricks, S. , Haas, C. , Helm, V. , Stenseng, L. and Tonboe, R. (2009)
Freeboard and HEM sea ice thickness measurements in 2005, 2006 and 2008 ,
Joint CryoSat-IceSat Science Team Meeting, Reykjavik, Iceland. .
hdl:10013/epic.33188
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Conference -Talk
Hendricks, S. , Haas, C. and Helm, V. (2008)
CryoVEx 2008: Airborne sea ice thickness campaign ,
CryoVEx 2008 Mid Term Review, Copenhagen. .
hdl:10013/epic.33462

Conference -Poster
Wesche, C. , Eisen, O. , Helm, V. , Riedel, S. , Rülke, A. and Steinhage, D. (2007)
Surface topography in the center of Dronning Maud Land, Antarctica, derived from airborne radar altimetry and ground based kinematic GPS measurements ,
General Assembly of the European Geosciences Union, Vienna, Austria, 15 April 2007 - 20 April 2007 .
hdl:10013/epic.42129

Conference -Poster
Dunse, T. , Helm, V. , Eisen, O. , Rack, W. and Steinhage, D. (2006)
The Cryosat land ice validation experiment 2004 Part II: Ground-based measurements of the firn structure using GPR ,
EGU General Assembly, Vienna, Austria 07 April 2006. .
hdl:10013/epic.24939
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Conference -Poster
Helm, V. , Cullen, R. and Rack, W. (2006)
The Cryosat land ice validation experiment CryoVex2004 Part I: ASIRAS vs. laser altimeter measurements ,
EGU General Assembly, Vienna, Austria 07 April 2006. .
hdl:10013/epic.26981
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Conference -Poster
Helm, V. and Rack, W. (2006)
The Cryosat land ice validation experiment CryoVex2004 Part I: ASIRAS vs. laser altimeter measurements ,
66. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 6.-9. März, Bremen. .
hdl:10013/epic.26982
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Conference -Poster
Dunse, T. , Helm, V. , Eisen, O. and Rack, W. (2006)
The internal layering of snow along a section of the EGIG-line, western Greenland, derived from GPR and ASIRAS-measurements ,
66. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 6.-9. März, Bremen. .
hdl:10013/epic.24938

Conference -Poster
Helm, V. and Jokat, W. (2003)
The sedimentary structure of the continental slope in the area of Larsen shelf, Eastern margin of Antarctica ,
63. Jahrestagung der Deutschen Geophysikalischen Gesellschaft, 23.-28. März, Jena. .
hdl:10013/epic.26984
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Miscellaneous

Miscellaneous
Hendricks, S. , Steinhage, D. , Helm, V. , Birnbaum, G. , Skou, N. , Kristensen, S. S. , Søbjærg, S. S. , Gerland, S. , Spreen, G. , Bratrein, M. and King, J. (2014)
SMOSice 2014: Data Acquisition Report ,
[Miscellaneous]
hdl:10013/epic.45054
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PANGAEA Documentation

PANGAEA Documentation
Rankl, M. , Braun, M. and Helm, V. (2015)
TanDEM-X ice thickness dataset for Wilkins Ice Shelf, Antarctic Peninsula ,
Bremerhaven, PANGAEA .
hdl:10013/epic.44969
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