Abstract
Abstract. Accumulation of snow and ice over time result in ice sheet layers. These can be remotely sensed where there is a contrast in electromagnetic properties, which reflect variations of the ice density, acidity and fabric orientation. Internal ice layers are assumed to be isochronous, deep beneath the ice surface, and parallel to the direction of ice flow. The distribution of internal layers is related to ice sheet dynamics, such as the basal melt rate, basal elevation variation and changes in ice flow mode, which are important parameters to model the ice sheet. Radar echo sounder is an effective instrument used to study the sedimentology of the Earth and planets. Ice Penetrating Radar (IPR) is specific kind of radar echo sounder, which extends studies of ice sheets from surface to subsurface to deep internal ice sheets depending on the frequency utilised. In this study, we examine a study site where folded ice occurs in the internal ice sheet south of the North Greenland Eemian ice drilling (NEEM) station, where two intersected radar echograms acquired by the Multi-channel Coherent Radar Depth Sounder (MCoRDS) employed in the NASA’s Operation IceBridge (OIB) mission imaged this folded ice. We propose a slice processing flow based on a Radon Transform to trace and extract these two sets of curved ice sheet layers, which can then be viewed in 3-D, demonstrating the 3-D structure of the ice folds.
Highlights
Ice sheet layers are principally caused by the accumulation and melting) of snow and ice year by year (Vieli, Siegert, and Payne 2004)
In order to demonstrate the effectiveness of the block processing of the Semi-Automated Multilayer Picking Algorithm (SAMPA) and slice processing proposed by this paper, we compared the linear features detected by these two methods, which are shown in Fig. 9, from which we can see that the slice processing method (Fig. 9a) can extract curved linear features with a slight merger of layers, while lines detected by block processing are very hard to be connected because the amplitude gradient was not utilised and many gaps appear during line detection by block processing
Detection of ice sheet layers is important to ice sheet studies yet difficult to be achieved with high efficiency and accuracy at the same time
Summary
Ice sheet layers are principally caused by the accumulation and melting) of snow and ice year by year (Vieli, Siegert, and Payne 2004). The echo-free zone (EFZ) and layer disturbances in the ice sheets are heated discussed to reflect sub-glacial ice flow at various scales (Drews et al 2009). Both of the continuity and disturbances of ice sheet layers are indications of ice sheet dynamics, which are very important input parameters to ice sheet modelling and geologic research.
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