Surface elevation changes of glaciers derived from SRTM and TanDEM-X DEM differences

Jaber, Wael Abdel; Floricioiu, Dana; Rott, Helmut; Eineder, Michael

doi:10.1109/igarss.2013.6723173

Cited by 30 publications

(29 citation statements)

References 13 publications

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“…Our results differ from the study by Willis and others [7] since we use no penetration depth correction for the SRTM C-band data. In contrast to those authors and in line with Abdel Jaber [40,41] we consider surface melt conditions for almost the entire SPI during SRTM acquisition and hence no signal penetration. Our TDX data from the austral summer 2015/16 show similar surface conditions as the careful inspection of the SAR intensity imagery revealed.…”

Section: Elevation and Mass Changes Of The Entire Spimentioning

confidence: 41%

“…This is caused by the interferometric approach of our study while in the optical ASTER datasets cloudy pixels or correlation mismatches remain in bright areas of the accumulation areas, which might not have been filtered out sufficiently by the time series analysis. The most pronounced surface lowering rates of Jorge Montt and Upsala as well as HPS12 Glacier have been noted by previous studies as well [7,41]. Those are most likely caused by dynamic adjustments to the fast retreat of their glacier fronts.…”

Section: Elevation and Mass Changes Of The Entire Spimentioning

confidence: 62%

“…Our TDX data from the austral summer 2015/16 show similar surface conditions as the careful inspection of the SAR intensity imagery revealed. In contrast to Abdel Jaber [41] our analysis of entire SPI covers a larger time span and uses the SRTM C-Band 30 m dataset as reference in contrast to the 90 m product used in those earlier studies. We used a different processing approach as the operational TanDEM-X DEM processor of the German Aerospace Center.…”

Section: Elevation and Mass Changes Of The Entire Spimentioning

confidence: 99%

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Elevation and Mass Changes of the Southern Patagonia Icefield Derived from TanDEM-X and SRTM Data

et al. 2018

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Abstract:The contribution to sea level rise from Patagonian icefields is one of the largest mass losses outside the large ice sheets of Antarctica and Greenland. However, only a few studies have provided large-scale assessments in a spatially detailed way to address the reaction of individual glaciers in Patagonia and hence to better understand and explain the underlying processes. In this work, we use repeat radar interferometric measurements of the German TerraSAR-X-Add-on for Digital Elevation Measurements (TanDEM-X) satellite constellation between 2011/12 and 2016 together with the digital elevation model from the Shuttle Radar Topography Mission (SRTM) in 2000 in order to derive surface elevation and mass changes of the Southern Patagonia Icefield (SPI). Our results reveal a mass loss rate of −11.84 ± 3.3 Gt·a −1 (corresponding to 0.033 ± 0.009 mm·a −1 sea level rise) for an area of 12573 km 2 in the period 2000-2015/16. This equals a specific glacier mass balance of −0.941 ± 0.19 m w.e.·a −1 for the whole SPI. These values are comparable with previous estimates since the 1970s, but a magnitude larger than mass change rates reported since the Little Ice Age. The spatial pattern reveals that not all glaciers respond similarly to changes and that various factors need to be considered in order to explain the observed changes. Our multi-temporal coverage of the southern part of the SPI (south of 50.3 • S) shows that the mean elevation change rates do not vary significantly over time below the equilibrium line. However, we see indications for more positive mass balances due to possible precipitation increase in 2014 and 2015. We conclude that bi-static radar interferometry is a suitable tool to accurately measure glacier volume and mass changes in frequently cloudy regions. We recommend regular repeat TanDEM-X acquisitions to be scheduled for the maximum summer melt extent in order to minimize the effects of radar signal penetration and to increase product quality.

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Section: Elevation and Mass Changes Of The Entire Spimentioning

confidence: 41%

Section: Elevation and Mass Changes Of The Entire Spimentioning

confidence: 62%

Section: Elevation and Mass Changes Of The Entire Spimentioning

confidence: 99%

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Elevation and Mass Changes of the Southern Patagonia Icefield Derived from TanDEM-X and SRTM Data

et al. 2018

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“…Due to its shorter wavelength, the X-band must have a lower penetration in snow and ice than the C-band (Surdyk, 2002b). Stuefer et al (2007) found a small elevation difference between SRTM band-C and GPS measurements on Perito Moreno glacier and Jaber et al (2013) found that firn in the accumulation area of the southern Patagonian ice field was wet during the acquisition of SRTM, which inhibits the penetration of the radar signal. Since Monte Tronador is located further north it is reasonable to assume that the firn in the accumulation area was also wet due to surface melting, inhibiting the penetration of the X-band.…”

Section: Study Area and Climatic Settingmentioning

confidence: 99%

“…Gardelle et al, 2013). Due to the low penetration of X-band in snow/ice wet surface (Jaber et al, 2013;Rignot et al, 2001;Stuefer et al, 2007), we discarded any significant bias associated with it. We determined the horizontal and vertical shifts of the DEMs using the universal co-registration method of Nuth and Kääb (2011).…”

Section: Adjustment and Correction Of Dem Biasmentioning

confidence: 99%

Recent geodetic mass balance of Monte Tronador glaciers, northern Patagonian Andes

et al. 2017

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Abstract. Glaciers in the northern Patagonian Andes (35-46 • S) have shown a dramatic decline in area in the last decades. However, little is known about glacier mass balance changes in this region. This study presents a geodetic mass balance estimate of Monte Tronador (41.15 • S; 71.88 • W) glaciers by comparing a Pléiades digital elevation model (DEM) acquired in 2012 with the Shuttle Radar Topography Mission (SRTM) X-band DEM acquired in 2000. We find a slightly negative Monte-Tronador-wide mass budget of −0.17 m w.e. a −1 (ranging from −0.54 to 0.14 m w.e. a −1 for individual glaciers) and a slightly negative trend in glacier extent (−0.16 % a −1 ) over the 2000-2012 period. With a few exceptions, debris-covered valley glaciers that descend below a bedrock cliff are losing mass at higher rates, while mountain glaciers with termini located above this cliff are closer to mass equilibrium. Climate variations over the last decades show a notable increase in warm season temperatures in the late 1970s but limited warming afterwards. These warmer conditions combined with an overall drying trend may explain the moderate ice mass loss observed at Monte Tronador. The almost balanced mass budget of mountain glaciers suggests that they are probably approaching a dynamic equilibrium with current (post-1977) climate, whereas the valley glaciers tongues will continue to retreat. The slightly negative overall mass budget of Monte Tronador glaciers contrasts with the highly negative mass balance estimates observed in the Patagonian ice fields further south.

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Ice motion of the Patagonian Icefields of South America: 1984–2014

Mouginot

Rignot

2015

Geophysical Research Letters

102

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We present the first comprehensive high-resolution mosaic of ice velocity of the Northern (NPI) and Southern Patagonian Icefields (SPI), from multiple synthetic aperture radar and optical data collected between 1984 and 2014. The results reveal that many of the outlet glaciers extend far into the central ice plateaus, which implies that changes in ice dynamics propagate far inside the accumulation area. We report pronounced seasonal to interannual variability of ice motion on Pío XI and Jorge Montt, a doubling in speed of Jorge Montt, a major slow down of O'Higgins, significant fluctuations of Upsala and a deceleration of San Rafael, which illustrate the need for sustained, continuous time series of ice motion to understand the long-term evolution of the rapidly thinning icefields. The velocity product also resolves major ambiguities in glacier drainage in areas of relatively flat topography illustrating the need to combine topography and flow direction to map drainage basins.

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Surface elevation changes of glaciers derived from SRTM and TanDEM-X DEM differences

Cited by 30 publications

References 13 publications

Elevation and Mass Changes of the Southern Patagonia Icefield Derived from TanDEM-X and SRTM Data

Elevation and Mass Changes of the Southern Patagonia Icefield Derived from TanDEM-X and SRTM Data

Recent geodetic mass balance of Monte Tronador glaciers, northern Patagonian Andes

Ice motion of the Patagonian Icefields of South America: 1984–2014

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