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

Lenzano, María Gabriela; Lannutti, Esteban; Toth, Charles K.; Lenzano, Luis; Lovecchio, A.

doi:10.5194/isprsarchives-xl-1-211-2014

Cited by 10 publications

(8 citation statements)

References 10 publications

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“…Time-lapse terrestrial photography is commonly used in polar and alpine regions to study the dynamics of glaciers or to follow the detachment of icebergs (Lenzano et al 2014, Medrzycka et al 2016). Underwater time-lapse studies in coastal polar regions are uncommon due to the intrinsic limitations of scientific SCUBA diving at sub-zero temperatures, the logistical challenges linked to the deployment of large-size and heavy time-lapse arrays and the risk of loss of the photo/video systems that may be misplaced or destroyed by iceberg scouring.…”

Section: Introductionmentioning

confidence: 99%

Time-lapse recording of yearly activity of the sea star Odontaster validus and the sea urchin Sterechinus neumayeri in Tethys Bay (Ross Sea, Antarctica)

et al. 2023

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One-year time-lapse images acquired via an autonomous photo imaging device positioned at a depth of 20 m in Tethys Bay (Ross Sea, Antarctica) on a rocky bottom colonized by the sponge Mycale (Oxymycale) acerata were analysed. Monthly changes in the abundance and activity of the sea star Odontaster validus and sea urchin Sterechinus neumayeri on the sponge and nearby rocky bottom were compared with respect to environmental variables such as pack-ice presence/absence, temperature, salinity and photosynthetically active radiation. Sea urchins were more abundant on the rocky bottom and sponge during the summer and winter, respectively. Sea stars showed a decrease in the number of individuals on the sponge from January to December. The grazing activity of both species reached its maximum in January–April, when increased sunlight contributed to the phytoplankton bloom. The winter months were critical both for O. validus and S. neumayeri; although the red sea star maintained its pattern of activity on the rocky bottoms in terms of searching for food, the sea urchin reduced its activity. Time-lapse monitoring systems coupled with physicochemical sensors showed potential for revealing species behaviour in polar environments, contributing to the elucidation of future changes in coastal communities facing climate change.

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Section: Introductionmentioning

confidence: 99%

Time-lapse recording of yearly activity of the sea star Odontaster validus and the sea urchin Sterechinus neumayeri in Tethys Bay (Ross Sea, Antarctica)

et al. 2023

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“…The SPI is drained by several outlet glaciers, which calve on sea water and proglacial lakes, creating strong rivers that are significant for the development of human activities in arid environments (De Angelis, 2014; Smith and Evans, 2007). Pre-existing studies have shown that the SPI is changing dramatically (Aniya and Skvarca, 2012; Lenzano et al, 2014, 2018; Lo Vecchio et al, 2018; Minowa et al, 2017; Moragues et al, 2018; Mouginot and Rignot, 2015; Rivera et al, 2012; Sakakibara and Sugiyama, 2014; Skvarca et al, 2002, 2004; Stuefer et al, 2007; Sugiyama et al, 2011, 2016; Warren et al, 1995; among others). The SPI has a strong east–west precipitation gradient.…”

Section: Introductionmentioning

confidence: 99%

MODIS Image-derived ice surface temperature assessment in the Southern Patagonian Icefield

Vecchio

Lannutti

Lenzano

et al. 2019

Progress in Physical Geography: Earth and Environment

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Ice surface temperature (IST) is one of the most relevant parameters when it comes to estimating the effects of climate change on glaciers. This study aims to estimate the IST for the Southern Patagonian Icefield (SPI) during the 2001–2016 period and, in so doing, to contribute to the assessment of the MOD11A1 product in this area. We evaluated IST performance by comparing it with that of automatic weather stations (AWSs). In addition, the glaciological significance of the results is presented through 1) IST trends, 2) annual IST anomalies, 3) IST behavior at different altitudes and orientations and 4) a comparison with Santa Cruz River flow records. The correlation coefficients obtained between the IST and AWSs ranged between 0.66 and 0.85. In addition, we report on the mean absolute differences between them, ranging between 0.6 ± 3.6°C and 9.4 ± 1.9°C. In this sense, we observed the lowest differences at the AWSs that were located in a homogeneous environment. Stated in glaciological terms: 1) only 1% of the pixels had a statically significant IST trend ( p-value ≤ 0.05): between 0.01 and 0.05°C/month; 2) we found that most of the IST anomalies ranged between –1 and 1°C throughout the period of this study; 3) the results suggest that the altimetric gradient was the most influential variable of the IST, mostly in north-oriented glaciers; and 4) the SPI IST showed an annual periodicity, which, in turn, shows a high correlation with the Santa Cruz River flow ( R = 0.86). This study is the first in estimating the SPI’s IST and contributes to enhance our knowledge of glacier dynamics and, therefore, the management of the water resource. Despite this, some MOD11 filtering is required in regions with high cloud cover frequency.

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“…Furthermore, photogrammetric image sequence analysis techniques were also successfully applied to serve as a virtual gauge within the framework of an early warning system for GLOF events (Mulsow et. al., 2013) or to investigate ice-dam collapses (Lenzano et. al., 2014).…”

Section: Introductionmentioning

confidence: 99%

Recognition of Drainage Tunnels During Glacier Lake Outburst Events From Terrestrial Image Sequences

Schwalbe¹,

Koschitzki²,

Maas³

2016

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

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ABSTRACT:In recent years, many glaciers all over the world have been distinctly retreating and thinning. One of the consequences of this is the increase of so called glacier lake outburst flood events (GLOFs). The mechanisms ruling such GLOF events are still not yet fully understood by glaciologists. Thus, there is a demand for data and measurements that can help to understand and model the phenomena. Thereby, a main issue is to obtain information about the location and formation of subglacial channels through which some lakes, dammed by a glacier, start to drain. The paper will show how photogrammetric image sequence analysis can be used to collect such data.For the purpose of detecting a subglacial tunnel, a camera has been installed in a pilot study to observe the area of the Colonia Glacier (Northern Patagonian Ice Field) where it dams the Lake Cachet II. To verify the hypothesis, that the course of the subglacial tunnel is indicated by irregular surface motion patterns during its collapse, the camera acquired image sequences of the glacier surface during several GLOF events. Applying tracking techniques to these image sequences, surface feature motion trajectories could be obtained for a dense raster of glacier points. Since only a single camera has been used for image sequence acquisition, depth information is required to scale the trajectories. Thus, for scaling and georeferencing of the measurements a GPS-supported photogrammetric network has been measured.The obtained motion fields of the Colonia Glacier deliver information about the glacier's behaviour before during and after a GLOF event. If the daily vertical glacier motion of the glacier is integrated over a period of several days and projected into a satellite image, the location and shape of the drainage channel underneath the glacier becomes visible. The high temporal resolution of the motion fields may also allows for an analysis of the tunnels dynamic in comparison to the changing water level of the lake.

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

Cited by 10 publications

References 10 publications

Time-lapse recording of yearly activity of the sea star Odontaster validus and the sea urchin Sterechinus neumayeri in Tethys Bay (Ross Sea, Antarctica)

Time-lapse recording of yearly activity of the sea star Odontaster validus and the sea urchin Sterechinus neumayeri in Tethys Bay (Ross Sea, Antarctica)

MODIS Image-derived ice surface temperature assessment in the Southern Patagonian Icefield

Recognition of Drainage Tunnels During Glacier Lake Outburst Events From Terrestrial Image Sequences

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