Perito Moreno Glacier (Argentina) flow estimation by COSMO SkyMed sequence of high-resolution SAR-X imagery

Ciappa, Achille; Pietranera, L.; Battazza, Fabrizio

doi:10.1016/j.rse.2010.04.014

Cited by 32 publications

(27 citation statements)

References 13 publications

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“…Taking into account the pixel dimension (∼ 2.4 m in ground range and ∼ 2.2 m in azimuth) those values correspond to a square window of 240 × 220 m, which is in agreement with the displacement occurring on studied SPI glaciers (i.e. Perito Moreno (Ciappa et al, 2010)). …”

Section: Data Processingsupporting

confidence: 83%

“…A possible cause of temporal decorrelation is the proper glacier motion which is related to sudden and rapid shifts between neighboring pixels. In this context, the use of Offset Tracking with SAR images is an alternative to DInSAR for inferring ice-surface velocity (Ciappa et al, 2010;Derauw, 1999;Strozzi et al, 2002b). It is carried out by using the SAR signal amplitude only, avoiding the necessity of phase unwrapping, being it one of the most critical steps when InSAR/DInSAR techniques are applied.…”

Section: Introductionmentioning

confidence: 99%

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Offset tracking procedure applied to high resolution SAR data on Viedma Glacier, Patagonian Andes, Argentina

Riveros

Euillades

et al. 2013

Adv. Geosci.

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Abstract. Main aim of this work is to explore the suitability of high resolution SAR images for measuring ice flow velocity within glaciers. Available techniques for this purpose are Differential SAR Interferometry (DInSAR) and Offset Tracking. The former, although theoretically much more precise, is frequently limited by coherence loss (or lacking of coherence) in glacier environment. The latter constitutes an alternative that works well when displacements are large. Study area is the Viedma Glacier (Santa Cruz, Argentina), one of the largest uncovered ice bodies in the South Patagonian Ice (SPI). High resolution COSMO-SkyMed (CSK) acquisitions were processed by estimating range and azimuth offset fields. Useful results, consisting in displacement maps showing areas with different fast-flowing units, were obtained by Offset Tracking processing.

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Section: Data Processingsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Offset tracking procedure applied to high resolution SAR data on Viedma Glacier, Patagonian Andes, Argentina

Riveros

Euillades

et al. 2013

Adv. Geosci.

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“…Positions 2 and 3 have similar trends, described as a front advance; the mean velocities are 0.58m/d ±0.03m and 0.67m/d ±0.003m, respectively. These results are according to Ciappa et al (2010) where velocity maps of the front of PM was obtained by cross correlation SAR imagery in November of 2009. Figure 7e shows the height variation.…”

Section: Glaciological Resultssupporting

confidence: 56%

Assessment of ice-dam collapse by time-lapse photos at the Perito Moreno glacier, Argentina

Lenzano

Lannutti

Toth³

et al. 2014

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

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Commission I, WG I/2 KEY WORDS: time-lapse, information extraction, ice-dam change, Perito Moreno ABSTRACT:This research provides a feasibility study on the implementation and performance assessment of time-lapse processing of a monoscopic image sequence, acquired by a calibrated camera in the Perito Moreno Glacier in Argentina. The glacier is located at 50° 28' 23''S, 73° 02' 10''W at the Parque Nacional Los Glaciares, South Patagonia Icefield, Santa Cruz and has experienced minor fluctuations and unusual behavior since the early 1960's to present. The objective of this study was to determine the evolution and changes in the ice-dam of the Perito Moreno glacier that started on November, 23 2012 and collapsed on January 19, 2013. Two images every 24 hours were acquired since October 2012 until February 2013, a total of 135 days. Image information was supported by ground data. Image and ground data was correlated with a 2D affine transformation. This technique allows the determination of the distortions in the images and estimating the values of scale factors. This, along with an accurate time-lapse interval, has produced accurate data for the analysis. In addition, changes in the level of the Brazo Rico lake were validated with direct data in order to determine the degree of uncertainty in the estimation of changes in the glacier. Based on the calculations, advance rates of the front of the Perito Moreno glacier were estimated at 0.67m/d ±0.003m, and the tunnel evolution was also recorded.

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“…Surface speed of GPM was previously measured by remote sensing techniques as well as in-situ stake surveys, and these measurements reported short-term speed variations (Ciappa et al, 2010;Sugiyama et al, 2011). Summer speed-up was reported in the lower reaches of GPM, where ice flow speed in March was 66% faster than in August (Ciappa et al, 2010). Sugiyama et al (2011) performed high temporal resolution surface speed and subglacial water pressure measurements at 4.7 km from the terminus.…”

Section: Study Sitementioning

confidence: 98%

“…When the glacier advances, it flows onto the coast of Península Magallanes (Figure 1B), resulting in the formation of an ice-dam between BR and CT. Damming events have been observed repeatedly since the 1930s with intervals of typically 2-4 years until 1988 (Stuefer et al, 2007). Surface speed of GPM was previously measured by remote sensing techniques as well as in-situ stake surveys, and these measurements reported short-term speed variations (Ciappa et al, 2010;Sugiyama et al, 2011). Summer speed-up was reported in the lower reaches of GPM, where ice flow speed in March was 66% faster than in August (Ciappa et al, 2010).…”

Section: Study Sitementioning

confidence: 99%

Seasonal Variations in Ice-Front Position Controlled by Frontal Ablation at Glaciar Perito Moreno, the Southern Patagonia Icefield

et al. 2017

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The front position of calving glaciers is controlled by ice speed and frontal ablation which consists of the two processes of calving and subaqueous melting. However, the relative importance of these processes in frontal variation is difficult to assess and poorly understood, particularly for freshwater calving glaciers. To better understand the mechanism of seasonal variations involved in the ice front variations of freshwater calving glaciers, we measured front position, ice surface speed, air temperature, and proglacial lakewater temperature of Glaciar Perito Moreno in Patagonia. No substantial fluctuations in front position and ice speed occurred during the 15-year period studied (1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013), despite a warming trend in air temperature (0.059 • C a −1 ). Seasonal variations were observed both in the ice-front position (±50 m) and ice speed (±15%). The frontal ablation rate, computed from the frontal displacement rate and the ice speed, varied in a seasonal manner with an amplitude approximately five times greater than that in the ice speed. The frontal ablation correlated well with seasonal lakewater temperature variations (r = 0.96) rather than with air temperature (r = 0.86). Our findings indicate that the seasonal ice front variations of Glaciar Perito Moreno are primarily due to frontal ablation, which is controlled through subaqueous melting by the thermal conditions of the lake.

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Perito Moreno Glacier (Argentina) flow estimation by COSMO SkyMed sequence of high-resolution SAR-X imagery

Cited by 32 publications

References 13 publications

Offset tracking procedure applied to high resolution SAR data on Viedma Glacier, Patagonian Andes, Argentina

Offset tracking procedure applied to high resolution SAR data on Viedma Glacier, Patagonian Andes, Argentina

Assessment of ice-dam collapse by time-lapse photos at the Perito Moreno glacier, Argentina

Seasonal Variations in Ice-Front Position Controlled by Frontal Ablation at Glaciar Perito Moreno, the Southern Patagonia Icefield

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