Surface velocity estimations of ice shelves in the northern Antarctic Peninsula derived from MODIS data

Ke, Chang‐Qing; Zhou, Xiaobing; Shao, Zhude; Li, Lanyu

doi:10.1007/s11442-016-1266-3

Cited by 14 publications

(5 citation statements)

References 49 publications

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“…Variance is less than 30 m•a −1 in these two drainages as well, roughly half of the RMSE in comparison between the tie-point pairs and our result. This value of 30 m•a −1 is the same as the velocity retrieval difference between MODIS and Landsat, whose outstanding spectral and georeferencing characteristics have already been recognized [39]. In drainages where moderate scale ice shelves dominate, such as Dronning Maud, Lambert, and Peninsula, the result is yet acceptable since the mean and median of the difference is still relatively low, and the variance of the difference is the same order of that RMSE.…”

Section: Residual In Rock Outcropsupporting

confidence: 54%

“…Haug et al investigated Larsen-C ice shelf's velocity from 2002 to 2009 via MODIS, and the difference from Landsat's retrieval was within 30 m•a −1 [38]. Coincidentally, the Larsen-C ice shelf was chosen to be the study area again by Chen et al [39], and it was found to have accelerated continually since 2000. In fact, Wang et al [40] and Li et al [41] have exploited Declassified Intelligence Satellite Photography (DISP) images acquired during the Cold War period to trace back to earlier dynamic hints of the Larsen-C ice shelf.…”

Section: Introductionmentioning

confidence: 99%

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Antarctic Surface Ice Velocity Retrieval from MODIS-Based Mosaic of Antarctica (MOA)

Liu

et al. 2018

Remote Sensing

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The velocity of ice flow in the Antarctic is a crucial factor to determine ice discharge and thus future sea level rise. Feature tracking has been widely used in optical and radar imagery with fine resolution to retrieve flow parameters, although the primitive result may be contaminated by noise. In this paper, we present a series of modified post-processing steps, such as SNR thresholding by residual, complex Butterworth filters, and triple standard deviation truncation, to improve the performance of primitive results, and apply it to MODIS-based Mosaic of Antarctica (MOA) datasets. The final velocity field result displays the general flow pattern of the peripheral Antarctic. Seventy-eight out of 97 streamlines starting from seed points are smooth and continuous. The RMSE with 178 manually selected tie points is within 60 m•a −1 . The systematic comparison with Making Earth System Data Records for Use in Research Environments (MEaSUREs) datasets in seven drainages shows that the results regarding high magnitude and large-scale ice shelf are highly reliable; absolute mean and median difference are less than 18 m•a −1 , while the result of localized drainage suffered from too much tracking error. The relative differences from manually selected and random points are controlled within 8% when speed is beyond 500 m•a −1 , but bias and uncertainty are pronounced when speed is lower than that. The result through our accuracy control strategy highlights that coarse remote-sensed images such as Moderate Resolution Imaging Spectrophotometer (MODIS) can still offer the capability for comprehensive and long-term continental ice sheet surface velocity mapping.

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Section: Residual In Rock Outcropsupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Antarctic Surface Ice Velocity Retrieval from MODIS-Based Mosaic of Antarctica (MOA)

Liu

et al. 2018

Remote Sensing

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“…Because the ice flow velocities over stable control points (e.g., mountain peaks, nunataks, or domes) should approach zero, we used the mean ice flow velocities at these control points as the benchmarks for uncertainties resulting from feature-based image matching. This same method has been widely adopted in previous studies [41,42]. Uncertainties resulting from feature-based image matching (i.e., for the mean ice flow velocity at the control points) were approximately 21.26 m/year or within 2 pixels.…”

Section: Ice Flow Velocity Mappingmentioning

confidence: 99%

Evolving Instability of the Scar Inlet Ice Shelf based on Sequential Landsat Images Spanning 2005–2018

Qiao

Guo

et al. 2019

Remote Sensing

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Following the large-scale disintegration of the Larsen B Ice Shelf (LBIS) in 2002, ice flow velocities for its remnants and tributary glaciers began to increase. In this study, we used sequential Landsat images spanning 2005-2018 to produce detailed maps of the ice flow velocities and surface features for the Scar Inlet Ice Shelf (SIIS). Our results indicate that the ice flow velocities for the SIIS and its tributary glaciers (Flask and Leppard Glaciers) have substantially increased since 2005. Surface features, such as rifts and crevasses, have also substantially increased in both scope and scale and are particularly evident in the region between the Leppard Glacier and the Jason Peninsula. Several indicators-including the acceleration of ice flows, the rapid growth of major surface rifts, the heavily enhanced surface crevasses, and the dynamic position of the ice front-point to the evolving instability of the SIIS. These same indicators describe the conditions for the LBIS leading up to its 2002 collapse. To date, however, the SIIS remains intact. The formation of fast ice supporting the ice shelf front, combined with moderate mean summer temperatures, may be preventing or delaying its collapse.

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“…Many studies (e.g. Haug et al, 2010;Chen et al, 2016;Greene et al, 2018) have demonstrated that MODIS data can be successfully used for feature tracking on Antarctic ice shelves.…”

Section: Introductionmentioning

confidence: 99%

Two decades of dynamic change and progressive destabilization on the Thwaites Eastern Ice Shelf

et al. 2021

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Abstract. The Thwaites Eastern Ice Shelf (TEIS) buttresses the eastern grounded portion of Thwaites Glacier through contact with a pinning point at its seaward limit. Loss of this ice shelf will promote further acceleration of Thwaites Glacier. Understanding the dynamic controls and structural integrity of the TEIS is therefore important to estimating Thwaites' future sea-level contribution. We present a ∼ 20-year record of change on the TEIS that reveals the dynamic controls governing the ice shelf's past behaviour and ongoing evolution. We derived ice velocities from MODIS and Sentinel-1 image data using feature tracking and speckle tracking, respectively, and we combined these records with ITS_LIVE and GOLIVE velocity products from Landsat-7 and Landsat-8. In addition, we estimated surface lowering and basal melt rates using the Reference Elevation Model of Antarctica (REMA) DEM in comparison to ICESat and ICESat-2 altimetry. Early in the record, TEIS flow dynamics were strongly controlled by the neighbouring Thwaites Western Ice Tongue (TWIT). Flow patterns on the TEIS changed following the disintegration of the TWIT around 2008, with a new divergence in ice flow developing around the pinning point at its seaward limit. Simultaneously, the TEIS developed new rifting that extends from the shear zone upstream of the ice rise and increased strain concentration within this shear zone. As these horizontal changes occurred, sustained thinning driven by basal melt reduced ice thickness, particularly near the grounding line and in the shear zone area upstream of the pinning point. This evidence of weakening at a rapid pace suggests that the TEIS is likely to fully destabilize in the next few decades, leading to further acceleration of Thwaites Glacier.

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Surface velocity estimations of ice shelves in the northern Antarctic Peninsula derived from MODIS data

Cited by 14 publications

References 49 publications

Antarctic Surface Ice Velocity Retrieval from MODIS-Based Mosaic of Antarctica (MOA)

Antarctic Surface Ice Velocity Retrieval from MODIS-Based Mosaic of Antarctica (MOA)

Evolving Instability of the Scar Inlet Ice Shelf based on Sequential Landsat Images Spanning 2005–2018

Two decades of dynamic change and progressive destabilization on the Thwaites Eastern Ice Shelf

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