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Items where Author is "Helm, Veit"

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Number of items: 107.

Article

Humbert, A. , Steinhage, D. , Helm, V. , Beyer, S. and Kleiner, T. (2018)
Missing evidence of widespread subglacial lakes at Recovery Glacier, Antarctica ,

Journal of Geophysical Research: Earth Surface, 123 , pp. 2802-2826 .

doi:https://doi.org/10.1029/2017JF004591 , hdl:10013/epic.2cfa7ae5-c211-47d2-9a82-f9e136d64478

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Article

Zhang, B. , Zhang, E. , Liu, L. , Khan, S. A. , van Dam, T. , Yao, Y. , Bevis, M. and Helm, V. (2018)
Geodetic measurements reveal short-term changes of glacial mass near Jakobshavn Isbræ (Greenland) from 2007 to 2017 ,

Earth and Planetary Science Letters, 503 , pp. 216-226 .

doi:https://doi.org/10.1016/j.epsl.2018.09.029 , hdl:10013/epic.f8a92688-0178-4d94-bc9d-be80308d9a57

Article

Sandberg Sørensen, L. , Simonsen, S. , Langley, K. , Gray, L. , Helm, V. , Nilsson, J. , Stenseng, L. , Skourup, H. , Forsberg, R. and Davidson, M. (2018)
Validation of CryoSat-2 SARIn Data over Austfonna Ice Cap Using Airborne Laser Scanner Measurements ,

Remote Sensing, 10 (9), p. 1354 .

doi:https://doi.org/10.3390/rs10091354 , hdl:10013/epic.c8e347b9-8135-42bb-83ab-c3a13dd4822f

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Article

The IMBIE team, Shepherd, A. , Sasgen, I. and Helm, V. (2018)
Mass balance of the Antarctic Ice Sheet from 1992 to 2017 ,

Nature, 558 (7709), pp. 219-222 .

doi:https://doi.org/10.1038/s41586-018-0179-y , hdl:10013/epic.7f0d293c-6cf4-4659-827e-d2a3b39aebfb

Article

King, J. , Skourup, H. , Hvidegaard, S. M. , Rösel, A. , Gerland, S. , Spreen, G. , Polashenski, C. , Helm, V. and Liston, G. E. (2018)
Comparison of Freeboard Retrieval and Ice Thickness Calculation From ALS, ASIRAS, and CryoSat-2 in the Norwegian Arctic to Field Measurements Made During the N-ICE2015 Expedition ,

Journal of Geophysical Research: Oceans, 123 (2), pp. 1123-1141 .

doi:https://doi.org/10.1002/2017JC013233 , hdl:10013/epic.833f804b-dfe8-4605-84d6-aedc6bfca636

Article

Karlsson, N. B. , Binder, T. , Eagles, G. , Helm, V. , Pattyn, F. , Van Liefferinge, B. and Eisen, O. (2018)
Glaciological characteristics in the Dome Fuji region and new assessment for “Oldest Ice” ,

The Cryosphere, 12 (7), pp. 2413-2424 .

doi:https://doi.org/10.5194/tc-12-2413-2018 , hdl:10013/epic.c347a7b3-cc66-431d-a41a-4494e50a0baf

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Article

Kjær, K. H. , Larsen, N. K. , Binder, T. , Bjørk, A. A. , Eisen, O. , Fahnestock, M. A. , Funder, S. , Garde, A. A. , Haack, H. , Helm, V. , Houmark-Nielsen, M. , Kjeldsen, K. K. , Khan, S. A. , Machguth, H. , McDonald, I. , Morlighem, M. , Mouginot, J. , Paden, J. D. , Waight, T. E. , Weikusat, C. , Willerslev, E. and MacGregor, J. A. (2018)
A large impact crater beneath Hiawatha Glacier in northwest Greenland ,

Science Advances, 4 (11), eaar8173 .

doi:https://doi.org/10.1126/sciadv.aar8173 , hdl:10013/epic.df3645ba-80d7-477b-ba57-1df014f8de5f

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Article

Berger, S. , Drews, R. , Helm, V. , Sun, S. and Pattyn, F. (2017)
Detecting high spatial variability of ice shelf basal mass balance, Roi Baudouin Ice Shelf, Antarctica ,

The Cryosphere, 11 (6), pp. 2675-2690 .

doi:https://doi.org/10.5194/tc-11-2675-2017 , hdl:10013/epic.c484abdf-a73b-4707-80cf-acc88cad573f

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Article

Obu, J. , Lantuit, H. , Grosse, G. , Günther, F. , Sachs, T. , Helm, V. and Fritz, M. (2017)
Coastal erosion and mass wasting along the Canadian Beaufort Sea based on annual airborne LiDAR elevation data ,

Geomorphology, 293 , pp. 331-346 .

doi:https://doi.org/10.1016/j.geomorph.2016.02.014 , hdl:10013/epic.47349

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Article

Schwegmann, S. , Rinne, E. , Ricker, R. , Hendricks, S. and Helm, V. (2016)
About the consistency between Envisat and CryoSat-2 radar freeboard retrieval over Antarctic sea ice ,

Cryosphere .

doi:https://doi.org/10.5194/tc-10-1415-2016 , hdl:10013/epic.48202

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Article

Martín-Español, A. , Zammit-Mangion, A. , Clarke, P. J. , Flament, T. , Helm, V. , King, M. A. , Luthcke, S. B. , Petrie, E. , Rémy, F. , Schön, N. , Wouters, B. and Bamber, J. L. (2016)
Spatial and temporal Antarctic Ice Sheet mass trends, glacio-isostatic adjustment, and surface processes from a joint inversion of satellite altimeter, gravity, and GPS data ,

Journal of Geophysical Research: Earth Surface, 121 (2), pp. 182-200 .

doi:https://doi.org/10.1002/2015JF003550 , hdl:10013/epic.48375

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Article

Radosavljevic, B. , Lantuit, H. , Pollard, W. , Overduin, P. , Couture, N. J. , Sachs, T. , Helm, V. and Fritz, M. (2015)
Erosion and Flooding—Threats to Coastal Infrastructure in the Arctic: A Case Study from Herschel Island, Yukon Territory, Canada ,

Estuaries and Coasts, pp. 1-16 .

doi:https://doi.org/10.1007/s12237-015-0046-0 , hdl:10013/epic.46279

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Article

Seehaus, T. , Marinsek, S. , Helm, V. , Skvarca, P. and Braun, M. (2015)
Changes in ice dynamics, elevation and mass discharge of Dinsmoor–Bombardier–Edgeworth glacier system, Antarctic Peninsula ,

Earth and Planetary Science Letters , 427 , 125 - 135 .

doi:https://doi.org/10.1016/j.epsl.2015.06.047 , hdl:10013/epic.46032

Article

Ricker, R. , Hendricks, S. , Perovich, D. K. , Helm, V. and Gerdes, R. (2015)
Impact of snow accumulation on CryoSat-2 range retrievals over Arctic sea ice: An observational approach with buoy data ,

Geophysical Research Letters .

doi:https://doi.org/10.1002/2015GL064081 , hdl:10013/epic.45726 Item availablity restricted.

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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:https://doi.org/10.3189/2015JoG14J157 , hdl:10013/epic.45308

Article

Ricker, R. , Hendricks, S. , Perovich, D. K. , Helm, V. and Gerdes, R. (2015)
Impact of snow accumulation on CryoSat-2 range retrievals over Arctic sea ice: An observational approach with buoy data ,

Geophysical Research Letters, 42 (11), pp. 4447-4455 .

doi:https://doi.org/10.1002/2015GL064081 , hdl:10013/epic.46821

Article

Humbert, A. , Steinhage, D. , Helm, V. , Hoerz, S. , Behrendt, J. , Leipprandt, E. , Christmann, J. , Plate, C. and Müller, R. (2015)
On the link between surface and basal structures of the Jelbart Ice Shelf, Antarctica ,

Journal of Glaciology, 61 (229), pp. 975-986 .

doi:https://doi.org/10.3189/2015JoG15J023 , hdl:10013/epic.46208

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

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:https://doi.org/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

Conference

Conference -Talk

Sobiech-Wolf, J. , Ullmann, T. , Kunz, J. , Kneisel, C. , Steinhage, D. , Helm, V. , Hartmann, J. , Baumhauer, R. and Dierking, W. (2019)
Detektion der Auftauschicht in Permafrostgebieten mittels flugzeuggestütztem GPR ,

79. Jahrestagung DGG, Braunschweig, 4 March 2019 - 7 March 2019 .

hdl:10013/epic.4e49867a-7a43-4419-8ea4-fb258da0e02c

Conference -Poster

Antonova, S. , Höfle, B. , Thiel, C. , Marx, S. , Anders, K. , Helm, V. and Boike, J. (2018)
Estimation of forest properties in a treeline zone using TanDEM-X and airborne laser scanning data ,

5th European Conference on Permafrost (EUCOP 2018), Chamonix, France, 23 June 2018 - 1 July 2018 .

hdl:10013/epic.abf71925-2556-47b4-bf56-cf74a08a0fb2

Conference -Poster

Antonova, S. , Anders, K. , Helm, V. , Höfle, B. , Marx, S. and Boike, J. (2017)
Bistatic coherence from CoSSC TanDEM-X data for tree height estimation in the Canadian Subarctic ,

5th HGF Alliance “Remote Sensing and Earth System Dynamics” Week, 26 June 2017 - 30 June 2017 .

hdl:10013/epic.51387

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Conference -Poster

Radosavljevic, B. , Lantuit, H. , Pollard, W. , Overduin, P. , Couture, N. J. , Sachs, T. , Helm, V. and Fritz, M. (2016)
Threats to Coastal Infrastructure from Erosion and Flooding: A Case Study from Herschel Island, Yukon Territory, Canada ,

11th International Conference on Permafrost, Potsdam, Germany, 20 June 2016 - 24 June 2016 .

hdl:10013/epic.48146

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Conference -Talk

Wouters, B. , Bamber, J. , Ligtenberg, S. , Kuipers-Munneke, P. , van den Broeke, M. , Helm, V. and Hurkmans, R. T. W. L. (2016)
A 15 year continuous time series of mass trends for the Greenland ice sheet from satellite altimetry ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.48370

Conference -Talk

Sandberg Sørensen, L. , Baker, S. , Csatho, B. , Forsberg, R. , Gourmelen, N. , Helm, V. , Langley, K. , Martinez, B. , Nienow, P. , Schrama, E. , Shepherd, A. , Davidson, M. and Simonsen, S. B. (2016)
CryoSat Land Ice Product Validation within the CryoVal-LI project ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.48364

Conference -Talk

Knöfel, C. , Scheinert, M. , Schröder, L. , Strößenreuther, U. , Helm, V. and Horwath, M. (2016)
CryoSat-2 calibration/validation in Antarctica: Quantifying uncertainties utilising different satellite, airborne and ground-based techniques ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.48363

Conference -Poster

Seehaus, T. , Marinsek, S. , Helm, V. , Steinhage, D. , Skvarca, P. , Seco, J. and Braun, M. (2016)
Observation of Changes in Ice Dynamics at the northern Antarctic Peninsula ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.48367

Conference -Poster

Helm, V. and Humbert, A. (2016)
Recent ice-volume and mass change of Greenland and Antarctica by CryoSat-2 altimetry ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.48368

Conference -Poster

Konrad, H. , Hogg, A. , Morris, L. , Smith, A. , Helm, V. , Steinhage, D. , Mulvany, R. , Gurney, R. J. and Shepherd, A. (2016)
Stratigraphy and surface accumulation variations on Pine Island Glacier, West Antarctica, from airborne, ground-based and satellite observations ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.48366

Conference -Poster

Hogg, A. , Shepherd, A. , Nagler, T. , Gilbert, L. , Wuite, J. , Muir, A. , Corr, H. , Steinhage, D. , Helm, V. , Rott, H. and Drinkwater, M. (2016)
Utility of CryoSat-2 data for locating the ice sheet grounding line and determining ice shelf thickness: Final outcomes of the ESA STSE GLITter project ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.48369

Conference -Talk

Schröder, L. , Helm, V. , Richter, A. , Fedorov, D. , Eberlein, L. , Brovkov, E. , Knöfel, C. , Horwath, M. and Lukin, V. (2016)
Validation of CryoSat-2 products over the East Antarctica Ice Sheet ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.48365

Conference -Poster

Jansen, D. , Helm, V. , Neckel, N. , Luckman, A. J. and Bevan, S. (2016)
Observed rift propagation in the Larsen C Ice Shelf from Sentinel 1-A radar data ,

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

hdl:10013/epic.47801

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Conference -Poster

Ricker, R. , Hendricks, S. , Kaleschke, L. , Schwegmann, S. , Rinne, E. and Helm, V. (2016)
Arctic and Antarctic Sea-Ice Thickness Derived from CryoSat-2, SMOS, and Envisat ,

EGU 2016, Vienna, 18 April 2016 - 22 April 2016 .

hdl:10013/epic.47758

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Conference -Poster

Shfaqat, A. K. , Sasgen, I. , Bevis, M. , van Dam, T. , Wahr, J. , Bamber, J. , Wouters, B. , Helm, V. , Willis, M. , Csatho, B. , Knudsen, P. , Kuipers-Munneke, P. and Kjaer, K. (2016)
Iceland hotspot track in southeast Greenland causes huge present-day vertical viscoelastic motion of the bedrock ,

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

hdl:10013/epic.48372

Conference -Talk

Berger, S. , Drews, R. , Helm, V. , Rack, W. , Lenaerts, J. , Ligtenberg, S. and Pattyn, F. (2016)
Observing ice-shelf channels and basal melting from space ,

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

hdl:10013/epic.48371

Conference -Invited talk

Ricker, R. , Hendricks, S. , Kaleschke, L. and Helm, V. (2016)
Sea Ice Thickness obtained from Space ,

Ifremer colloquium, Ifremer, Brest, France .

hdl:10013/epic.7d787f23-8859-438f-9580-ee7f32cc9c4f

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Conference -Poster

Neckel, N. , Helm, V. , Humbert, A. , Rosenau, R. and Ebermann, B. (2016)
Near real time surface velocity measurements of North-East Greenland Ice Stream outlet glaciers from Sentinel-1A data ,

ESA Living Planet Symposium, Prague, Czech Republic, 9 May 2016 - 13 May 2016 .

hdl:10013/epic.47918

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Conference -Poster

Binder, T. , Eisen, O. , Helm, V. , Humbert, A. and Steinhage, D. (2016)
Phase-sensitive radar on thick Antarctic ice – how well does it work? ,

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

hdl:10013/epic.47755

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Conference -Invited talk

Radosavljevic, B. , Lantuit, H. , Pollard, W. , Overduin, P. , Couture, N. J. , Sachs, T. , Helm, V. and Fritz, M. (2015)
Coastal Hazard Vulnerability Assessment: A Case Study of Erosion and Flooding on Herschel Island, Yukon Territory, Canada ,

AGU Fall Meeting, San Francisco, California, USA, 14 December 2015 - 18 December 2015 .

hdl:10013/epic.46682

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Conference -Invited talk

Ricker, R. , Hendricks, S. , Perovich, D. K. and Helm, V. (2015)
The impact of the snow cover on sea-ice thickness products, retrieved by Ku band radar altimeters ,

AGU Fall Meeting, San Francisco, December 2015 - December 2015 .

hdl:10013/epic.62893cf9-1e04-4d46-ab04-fb87c40e0d3c

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Conference -Invited talk

Helm, V. (2015)
Observing ice-volume change in Greenland and Antarctica using CryoSat-2 altimetry ,

IUGG, Prague, 22 June 2015 - 2 July 2015 .

hdl:10013/epic.48359

Conference -Poster

Humbert, A. , Helm, V. , Kleiner, T. and Steinhage, D. (2015)
How swampy is the base of Recovery Glacier, Antarctica? ,

International Symposium on Hydrology of Glaciers and Ice Sheets, Iceland, 21 June 2015 - 26 June 2015 .

hdl:10013/epic.49352

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 -Poster

Steinhage, D. , Helm, V. , Kasper, D. , Kleiner, T. and Humbert, A. (2014)
New Insights in the Existence of Lakes Beneath the Recovery Glacier Drainage Basin, Antarctica ,

AGU Fall Meeting, San Francisco, 15 December 2014 - 19 December 2014 .

hdl:10013/epic.49292

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 -Talk

Obu, J. , Lantuit, H. , Fritz, M. , Heim, B. , Schirrmeister, L. , Helm, V. and Wolter, J. (2014)
Organic carbon and nitrogen release by coastal erosion in the western Canadian Arctic ,

ESA DUE Permafrost Workshop, ESA ESRIN, Frascati (Rome), Italy, 11 February 2014 - 13 February 2014 .

Preview

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

Preview

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

Preview

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

Preview

Conference -Invited talk

Helm, V. (2010)
CryoSat-2, ESA's Mission to Ice ,

Koordinations-Workshop SPP 1257, Dipperz, Germany. .

hdl:10013/epic.35778

Preview

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

Preview

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

Preview

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

Preview

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

Preview

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

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

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

Miscellaneous

Hendricks, S. , Ricker, R. and Helm, V. (2016)
User Guide - AWI CryoSat-2 Sea Ice Thickness Data Product (v1.2)

[Miscellaneous]

hdl:10013/epic.48201

Preview

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