Journal cover Journal topic
The Cryosphere An interactive open-access journal of the European Geosciences Union
doi:10.5194/tc-2016-282
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
03 Jan 2017
Review status
This discussion paper is under review for the journal The Cryosphere (TC).
Validation of satellite altimetry by kinematic GNSS in central East Antarctica
Ludwig Schröder1, Andreas Richter1, Denis V. Fedorov2, Lutz Eberlein1, Evgeny V. Brovkov2, Sergey V. Popov3, Christoph Knöfel1, Martin Horwath1, Reinhard Dietrich1, Alexey Y. Matveev2, Mirko Scheinert1, and Valery Lukin4 1Technische Universität Dresden, Institut für Planetare Geodäsie, Dresden, Germany
2OAO Aerogeodeziya, St. Petersburg, Russia
3Polar Marine Geosurvey Expedition (PMGE), St. Petersburg, Russia
4Arctic and Antarctic Research Institute (AARI), St. Petersburg, Russia
Abstract. Ice-surface elevation profiles of more than 30.000 km in total length are derived from kinematic GNSS observations on sledge convoy vehicles along traverses between Vostok station and the East Antarctic coast. The profiles have accuracies between 4 and 9 cm. They are used to validate elevation datasets from both radar and laser satellite altimetry as well as four digital elevation models. A crossover analysis with three different Envisat radar altimetry datasets yields a clear preference for the relocation method over the direct method of slope correction and for threshold retrackers over functional fit algorithms. The validation of Cryosat-2 low-resolution mode and SARIn mode datasets documents the progress made from baseline B to C elevation products. ICESat laser altimetry data are demonstrated to be accurate to a few decimeters over wide range of surface slopes. A crossover adjustment above subglacial Lake Vostok combining ICESat elevation data with our GNSS profiles yields a new set of ICESat laser campaign biases and provides new, independent evidence for the stability of the ice-surface elevation above the lake. The evaluation of digital elevation models reveals the importance of radar altimetry for the reduction of interpolation errors.

Citation: Schröder, L., Richter, A., Fedorov, D. V., Eberlein, L., Brovkov, E. V., Popov, S. V., Knöfel, C., Horwath, M., Dietrich, R., Matveev, A. Y., Scheinert, M., and Lukin, V.: Validation of satellite altimetry by kinematic GNSS in central East Antarctica, The Cryosphere Discuss., doi:10.5194/tc-2016-282, in review, 2017.
Ludwig Schröder et al.
Ludwig Schröder et al.

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Kinematic GNSS profiles in central East Antarctica
L. Schröder
doi:10.1594/PANGAEA.869761
Ludwig Schröder et al.

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Short summary
The paper describes the processing of kinematic GNSS data observed during 9 seasons in East Antarctica. The obtained surface elevation profiles are used to validate the several datasets of satellite altimetry. Thus we find clear recommendation, which processing versions provide the highest accuracy. Finally the profiles are also used to derive a new set of ICESat laser campaign biases and to evaluate several DEMs.
The paper describes the processing of kinematic GNSS data observed during 9 seasons in East...
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