Morphological and ice-dynamical changes on the Tasman Glacier, New Zealand, 1990–2007

Quincey, Duncan J.; Glasser, Neil F.

doi:10.1016/j.gloplacha.2009.05.003

Cited by 86 publications

(105 citation statements)

References 38 publications

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“…By 1986, the ponds had grown to large lakes (>1 km along the major axis), although the large supraglacial ponds on the right and left sides of the glacier terminus remained separate. By 2007, however, the lakes had coalesced to form a single water body with a surface area of~6 km 2 (Quincey and Glasser, 2009). In Figure 2, the distribution of Himalayan glaciers with a supraglacial lake is different from that for glaciers with no such lake.…”

Section: Resultsmentioning

confidence: 99%

Formation conditions of supraglacial lakes on debris-covered glaciers in the Himalaya

Sakai¹,

Fujita²

2010

J. Glaciol.

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Section: Resultsmentioning

confidence: 99%

Formation conditions of supraglacial lakes on debris-covered glaciers in the Himalaya

Sakai¹,

Fujita²

2010

J. Glaciol.

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“…For example, upglacier expansion of the proglacial lake at Tasman Glacier, New Zealand, has repeatedly followed the location of former chains of sink holes on the glacier surface (Kirkbride, 1993;Quincey and Glasser, 2009). Recently formed chains of ponds in the lower ablation zone of Khumbu Glacier strongly suggest that the same process is underway on that glacier (Watson et al, 2016).…”

Section: Comparison With Other Debris-covered Glaciersmentioning

confidence: 99%

Structure and evolution of the drainage system of a Himalayan debris-covered glacier, and its relationship with patterns of mass loss

et al. 2017

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Abstract. We provide the first synoptic view of the drainage system of a Himalayan debris-covered glacier and its evolution through time, based on speleological exploration and satellite image analysis of Ngozumpa Glacier, Nepal. The drainage system has several linked components: (1) a seasonal subglacial drainage system below the upper ablation zone; (2) supraglacial channels, allowing efficient meltwater transport across parts of the upper ablation zone; (3) submarginal channels, allowing long-distance transport of meltwater; (4) perched ponds, which intermittently store meltwater prior to evacuation via the englacial drainage system; (5) englacial cut-and-closure conduits, which may undergo repeated cycles of abandonment and reactivation; and (6) a "base-level" lake system (Spillway Lake) dammed behind the terminal moraine. The distribution and relative importance of these elements has evolved through time, in response to sustained negative mass balance. The area occupied by perched ponds has expanded upglacier at the expense of supraglacial channels, and Spillway Lake has grown as more of the glacier surface ablates to base level. Subsurface processes play a governing role in creating, maintaining, and shutting down exposures of ice at the glacier surface, with a major impact on spatial patterns and rates of surface mass loss. Comparison of our results with observations on other glaciers indicate that englacial drainage systems play a key role in the response of debris-covered glaciers to sustained periods of negative mass balance.

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“…Ice velocity studies using the correlation method have among others been conducted in Antarctica (e.g., Scambos et al, 1992), on Svalbard (e.g., Rolstad et al, 1997;Kääb et al, 2005), in the Alps (e.g., Kääb, 2002;Berthier et al, 2005), in New Zealand (e.g., Kääb, 2002;Quincey and Glasser, 2009), in the Himalaya (e.g., Scherler et al, 2008;Kääb, 2005), in Greenland (e.g., Strozzi et al, 2002;Howat et al, 2005), and in Patagonia (e.g., Skvarca et al, 2003). However, very few have studied ice shelf velocities using the correlation method.…”

Section: Introductionmentioning

confidence: 99%

Monitoring ice shelf velocities from repeat MODIS and Landsat data – a method study on the Larsen C ice shelf, Antarctic Peninsula, and 10 other ice shelves around Antarctica

2010

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Abstract.We investigate the velocity field of the Larsen C ice shelf, Antarctic Peninsula, over the periods 2002-2006 and 2006-2009 based on repeat optical satellite data. The velocity field of the entire ice shelf is measured using repeat low resolution MODIS data (250 m spatial resolution). The measurements are validated for two ice shelf sections against repeat medium resolution Landsat 7 ETM+ pan data (15 m spatial resolution). Horizontal surface velocities are obtained through image matching using both orientation correlation operated in the frequency domain and normalized crosscorrelation operated in the spatial domain, and the two methods compared. The uncertainty in the displacement measurements turns out to be about one fourth of the pixel size for the MODIS derived data, and about one pixel for the Landsat derived data. The difference between MODIS and Landsat based speeds is −15.4 m a −1 and 13.0 m a −1 , respectively, for the first period for the two different validation sections on the ice shelf, and −26.7 m a −1 and 27.9 m a −1 for the second period for the same sections. This leads us to conclude that repeat MODIS images are well suited to measure ice shelf velocity fields and monitor their changes over time. Orientation correlation seems better suited for this purpose because it produces fewer mismatches, is able to match images with regular noise and data voids, and is faster. Since it can match images with regular data voids it is possible to match Landsat 7 ETM+ images even after the 2003 failure of the Scan Line Corrector (SLC off) that leaves significant image stripes with no data. Image matching based on the original 12-bit radiometric resolution MODIS data produced slightly better results than using the 8-bit version of the same images. Streamline interpolation from the obtained surface velocity field on Larsen C indicates ice travel times of up to 450 to 550 years between the inland boundary and the ice shelf edge. In a Correspondence to: T. Haug (torborg.haug@geo.uio.no) second step of the study we test our method successfully on 10 other ice shelves around Antarctica demonstrating that the approach presented could in fact be used for large scale monitoring of ice shelf dynamics.

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Morphological and ice-dynamical changes on the Tasman Glacier, New Zealand, 1990–2007

Cited by 86 publications

References 38 publications

Formation conditions of supraglacial lakes on debris-covered glaciers in the Himalaya

Formation conditions of supraglacial lakes on debris-covered glaciers in the Himalaya

Structure and evolution of the drainage system of a Himalayan debris-covered glacier, and its relationship with patterns of mass loss

Monitoring ice shelf velocities from repeat MODIS and Landsat data – a method study on the Larsen C ice shelf, Antarctic Peninsula, and 10 other ice shelves around Antarctica

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