A comparative study of changes in the Lambert Glacier/Amery Ice Shelf system, East Antarctica, during 2004–2008 using gravity and surface elevation observations

Xie, Huan; Li, Rongxing; Tong, Xiaohua; Ju, Xiaolei; Li, Jun; Shen, Yunzhong; Chen, Lei; Liu, Shijie; Sun, Bо; Cui, Xiangbin; Tian, Yixiang; Ye, Wenkai

doi:10.1017/jog.2016.76

Cited by 16 publications

(12 citation statements)

References 88 publications

(165 reference statements)

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“…Secondly, if the ICESat data within the 500m×500m grid cannot meet the above requirements to get the model parameters, we applied a simplified version of the first-step method including height change and local topography, and without the seasonal signal (Xie et al, 2016). The restricted conditions we applied for grids are at least 10 points and over 2.5 years.…”

Section: Elevation Estimation and Verificationmentioning

confidence: 99%

“…We interpolated ICESat points equally with an interval of 172m along reference track. Within each box used in the trend estimation, the least squares process was used in a condition of redundant observations to control the error as well as parameter uncertainties based on the error propagation law (Ewert et al, 2012, Xie et al, 2016. The uncertainty of the trend in a box can be calculated and furthermore, we estimated the uncertainties in the 30 km×30 km cells and then in the basins by using the scaled median absolute deviation (MAD) adopted from Ewert et al, 2012, which does not require a normal distribution.…”

Section: Elevation Estimation and Verificationmentioning

confidence: 99%

“…The elevation change value and uncertainty are calculated over the drainage basin level based on the subarea defined by Zwally et al,2015 (Figure 3). To validate our elevation change rate results, we compared them with other airborne data or in-situ measurements, including GPS (Global Position System) data over the Subglacial Lake Vostok and Pine Island Glacier, ATM (Airborne Terrain Mapper) data over the Antarctic Peninsula and CHINARE field measurements from Zhongshan Station to Dome A (Richter et al, 2014；Scott et al, 2009；Zwally et al, 2015Helm et al, 2014;Xie et al, 2016). The results of comparative analysis proved the rationality and accuracy of our solution for estimating the elevation change rate.…”

Section: Elevation Estimation and Verificationmentioning

confidence: 99%

See 2 more Smart Citations

Mass Balance of Antarctic Ice Sheet From 2003 to 2008: A Systematically Improved New Estimation

Li¹,

Xie²,

Tian³

et al. 2019

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

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<p><strong>Abstract.</strong> There exist several results of mass balance of the Antarctic Ice Sheet (AIS) estimated based the laser altimetry ICESat, especially for some with a significant difference. In this study, we attempt to use the ICESat data to re-estimate the mass balance of the AIS over 2003-2008 by making several systematic improvements in data processing and model construction. We applied all corrections to the ICESat data including the re-estimation of the ICB. A three-step model was used in different area for calculating elevation changes of the Antarctica ice sheet. The elevation change rate was compared with other results generated from Global Position System (GPS), stakes, Airborne Terrain Mapper (ATM) and CHINRE data. These verification data proved a good agreement between each other considering the uncertainty involved. We also corrected the component in the elevation change rates that do not contribute to the mass loss such as the global isostatic correction and firn compaction. The corrected elevation change result was converted to the mass change using a surface density model.</p>

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Section: Elevation Estimation and Verificationmentioning

confidence: 99%

Section: Elevation Estimation and Verificationmentioning

confidence: 99%

Section: Elevation Estimation and Verificationmentioning

confidence: 99%

See 1 more Smart Citation

Mass Balance of Antarctic Ice Sheet From 2003 to 2008: A Systematically Improved New Estimation

Li¹,

Xie²,

Tian³

et al. 2019

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

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“…The data set used is the GLA12 R633 product with an 20 overall vertical accuracy of 14 cm (5 cm in flat areas) (Schutz et al, 2005;Shuman et al, 2006). The data have been applied for the global and regional mass balance estimations of AIS and Greenland Ice Sheet (GIS) (Ewert et al, 2012;Zwally et al, 2015;Xie et al, 2016). of December 6, 2013, superimposed with a color-coded bottom marine ice thickness (Lambrecht et al, 2007).…”

Section: Datamentioning

confidence: 99%

A Systematic Study of the Fracturing of Ronne - Filchner Ice Shelf, Antarctica, Using Multisource Satellite Data from 2001 to 2016

Xiao

Liu

et al. 2017

Preprint

Self Cite

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Abstract. We propose a new framework of systematic fracture mapping and major calving event prediction for the large ice shelves in Antarctica using multisource satellite data, including optical imagery, SAR imagery, altimetric data, and stereo mapping imagery. The new framework is implemented and 10 applied for a comprehensive study of the fracturing of Ronne-Filchner Ice Shelf (RFIS), the second largest ice shelf in Antarctica, using a long time dataset dating back to 1957. New remote sensing data that have been made available in the past decade, including Landsat 8, WV-2, ZY-3 and others, greatly enhance our abilities to detect new fractures and monitor large rifts in three dimensions. Two large rifts, Rifts 1 and 2, were newly detected and are comparable to the Grand Chasm that caused a major calving event in 15 the region in 1986. Three-dimensional rift models generated from quasi real-time stereo ZY-3 images revealed important topographic information about the large rifts that can be used to improve the reliability of ice shelf modeling and support enhanced analyses of ice shelf stability. Based on the results of the 2D and 3D fracture mapping, the spatial and temporal analyses of the overall fracture changes and large rift evolutions, i.e., the level of fracturing in RFIS, were slightly increased, particularly at the front of the ice 20 sheet. The overall fracture observations do not seem to suggest immediate significant impacts on the stability of the shelf. However, the most active regional fracturing activities occurred at the front of Filchner Ice Shelf (FIS). A potential upcoming major calving event of FIS is estimated to occur in 2051.The stability of the ice shelf, particularly with regard to the developments of Rifts 1 and 2, should be closely monitored.

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“…Several studies have been carried out to evaluate the mass balance of the AIS basin, either for individual AIS basins (Wen et al, 2008;Wen et al, 2014;Xie et al, 2016;Yu et al, 2010) or for all of Antarctica, which includes the AIS basin (Gardner et al, 2018;Martin-Espanol et al, 2016;McMillan et al, 2014;Rignot et al, 2008;Rignot et al, 2019;Shen et al, 2018a). Broadly, three different techniques are used to assess ice sheet mass balances (Hanna et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Mass Balance Assessment of the Amery Ice Shelf Basin, East Antarctica

Zhou

Liang

Chen

et al. 2019

Earth and Space Science

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The Lambert Glacier-Amery Ice Shelf (AIS) System is the largest glacial system in East Antarctica. Accurate estimation of its mass balance is imperative for reducing the uncertainty in evaluating the sea-level contribution from the East Antarctic Ice Sheet. Here, we present a comprehensive investigation of the mass balance of the AIS basin. We measured the ice velocity with Sentinel-1 synthetic-aperture radar data acquired in 2016. The ice thickness data from the radio echo-sounding measurements were combined with the surface mass balance data from the new Regional Atmospheric Climate Model, from which the mass balance of the AIS basin was estimated. Our estimates suggest a slight positive mass balance of 3.1 ± 9.4 Gt/year in 2016. We found that the short-term fluctuations in the surface mass balance dramatically affect the AIS mass balance. A comparison with previous estimates confirms the long-term positive mass balance trend.

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A comparative study of changes in the Lambert Glacier/Amery Ice Shelf system, East Antarctica, during 2004–2008 using gravity and surface elevation observations

Cited by 16 publications

References 88 publications

Mass Balance of Antarctic Ice Sheet From 2003 to 2008: A Systematically Improved New Estimation

Mass Balance of Antarctic Ice Sheet From 2003 to 2008: A Systematically Improved New Estimation

A Systematic Study of the Fracturing of Ronne - Filchner Ice Shelf, Antarctica, Using Multisource Satellite Data from 2001 to 2016

Mass Balance Assessment of the Amery Ice Shelf Basin, East Antarctica

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