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Sea ice draft measured by upward looking sonar at mooring site AWI207-7

Publication Date
DOI: 10.1594/pangaea.821254
  • Ant-Xxiv/3
  • Awi207-7
  • Calculated
  • Draft
  • Mooring (Long Time)
  • Polarstern
  • Pressure
  • Water
  • Ps71
  • Temperature
  • Water
  • Temperature Recorder
  • Tilt Angle
  • Two Way Travel Time
  • Upward Looking Sonar (Uls)
  • Validation Flag/Comment
  • Weddell Sea


MONITORING ICE-ONSET ON LAKES AND RIVERS IN NORTHERN SIBERIA WITH TERRASAR-X IMAGERY Jennifer Sobiech (1) and Wolfgang Dierking (1) (1) Alfred Wegener Insitute Helmholtz Centre for Polar and Marine Research, Bussestr. 24, 27570 Bremerhaven, Germany, [email protected] ABSTRACT The timing and duration of ice-onset on lakes and river channels is a relevant climate signal since it is strongly driven by the air temperature. Space-borne imaging radar is a suitable tool for the detection of freeze processes, as the backscattering of radar waves is highly dependent on the dielectric properties of the surface. For this study, a time series of high-resolution TerraSAR-X images recorded during fall and winter 2012 was analysed. The images cover several lakes and river channels located in the central Lena Delta, North Siberia, Russia. On the basis of radar signature analysis and of classification results from visible inspection of the images, the potential of change detection and intensity-thresholds for the separation of thin ice covers and water surfaces is discussed. 1. INTRODUCTION Lakes and river channels are a frequent land cover type in Arctic tundra landscapes. In our study area, the Lena River Delta in northernmost Siberia, they cover more than 30% of the surface [1]. The timing of ice-onset is an important climate variable, as it depends on air temperatures, beside other factors such as lake size and depth [2, 3]. Remote sensing provides a means for obtaining regional information in the high Arctic where ground-based data networks are sparse. Spaceborne radar is a suitable tool to detect ice-onset on a regional scale, whereas the use of optical sensors is restricted due to darkness and cloud covers. Radar systems can monitor the earth surface at comparatively high spatial resolutions (on the order of 1 to 20 m), which allows to detect small-scale surface characteristics such as small lakes and narrow river channels, which

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