Multichannel Coherent Radar Depth Sounder for NASA Operation Ice Bridge

Shi, Lijian; Allen, Christopher T.; Ledford, John R.; Rodriguez‐Morales, Fernando; Blake, William; Panzer, B.; Prokopiack, Stephen C.; Leuschen, C.; Gogineni, S.

doi:10.1109/igarss.2010.5649518

Cited by 43 publications

(26 citation statements)

References 2 publications

(2 reference statements)

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“…The maximum ice thickness measured on PIC by a NASA airborne radar in 2013 was 880 m at a point ∼5.5 km northwest of the mass balance stake P106 ( Fig. 1; Shi and others, 2010). The average dates for the onset and end of the summer melt period between 2007 and 2010, determined from passive microwave data, were ∼23 May and ∼3 September, respectively (Personal communication from F. Dupont, 2015).…”

Section: Study Sitementioning

confidence: 97%

Ice velocity changes on Penny Ice Cap, Baffin Island, since the 1950s

2017

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ABSTRACT. Predicting the velocity response of glaciers to increased surface melt is a major topic of ongoing research with significant implications for accurate sea-level rise forecasting. In this study we use optical and radar satellite imagery as well as comparisons with historical ground measurements to produce a multi-decadal record of ice velocity variations on Penny Ice Cap, Baffin Island. Over the period 1985-2011, the six largest outlet glaciers on the ice cap decelerated by an average rate of 21 m a The recent slowdown of outlet glaciers has coincided with increases in mass loss, terminus retreat and an inferred reduction in basal sliding. Measured decelerations are greater than the total shortterm variability measured from both seasonal and interannual fluctuations, and support the hypothesis that glacier thinning and/or increased meltwater production promotes a long-term reduction in ice motion.

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Section: Study Sitementioning

confidence: 97%

Ice velocity changes on Penny Ice Cap, Baffin Island, since the 1950s

2017

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“…The MCoRDS is a nadir-looking, five-channel, monostatic radar system [12], which has the capability to penetrate up to several kilometers into the polar ice sheets. Before 2010, the radar system operated at a central frequency of 150 MHz, and a bandwidth of 17 MHz with a peak transmit power of 200 W. From 2010 onwards, the central frequency was changed to 195 MHz with a bandwidth of 30 MHz and with increasing peak transmit power up to 1200 W [12,25].…”

Section: Mcords L1b Datamentioning

confidence: 99%

“…Before 2010, the radar system operated at a central frequency of 150 MHz, and a bandwidth of 17 MHz with a peak transmit power of 200 W. From 2010 onwards, the central frequency was changed to 195 MHz with a bandwidth of 30 MHz and with increasing peak transmit power up to 1200 W [12,25].…”

Section: Mcords L1b Datamentioning

confidence: 99%

A New Method for Automatically Tracing Englacial Layers from MCoRDS Data in NW Greenland

2017

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Englacial layering reflects ice dynamics within the ice bodies, which improves understanding of ice flow variation, past accumulation rates and vertical flows transferring between the surface and the underlying bedrock. The internal layers can be observed by using Radar Echo Sounding (RES), such as the Multi-channel Coherent Radar Depth Sounder (MCoRDS) used in NASA's Operation IceBridge (OIB) mission. Since the 1960s, the accumulation of the RES data has prompted the development of automated methods to extract the englacial layers. In this study, we propose a new automated method that combines peak detection methods, namely the CWT-based peak detection or the Automatic Phase Picker (APP), with a Hough Transform (HT) to trace boundaries of englacial layers. For CWT-based peak detection, we test it using two different wavelets. The proposed method is tested with twelve MCoRDS radio echograms, which are acquired south of the Northern Greenland Eemian (NEEM) ice drilling site, where the folding of ice layers was observed. The method is evaluated in comparison to the isochrones that were extracted in an independent study. In comparison, the proposed new automated method can restore more than 70% of the englacial layers. This new automated layer-tracing method is publicly available on github.

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“…Among the radar sounders employed in OIB, the MCoRDS sensor developed by the Centre for Remote Sensing of Ice Sheets (CReSIS), is a nadir-looking, five channel, monostatic radar system (Shi et al 2010). It has the lowest frequency, which is supposed to penetrate as deep as several kilometres into the ice sheet in order to reveal the layering of the polar ice sheet.…”

Section: Icebridge Mission and Mcords Datasetsmentioning

confidence: 99%

Extraction of Ice Sheet Layers From Two Intersected Radar Echograms Near Neem Ice Core in Greenland

Xiong¹,

Müller²

2016

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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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.

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Multichannel Coherent Radar Depth Sounder for NASA Operation Ice Bridge

Cited by 43 publications

References 2 publications

Ice velocity changes on Penny Ice Cap, Baffin Island, since the 1950s

Ice velocity changes on Penny Ice Cap, Baffin Island, since the 1950s

A New Method for Automatically Tracing Englacial Layers from MCoRDS Data in NW Greenland

Extraction of Ice Sheet Layers From Two Intersected Radar Echograms Near Neem Ice Core in Greenland

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