Automatic delineation of debris-covered glaciers using InSAR coherence derived from X-, C- and L-band radar data: a case study of Yazgyl Glacier

Lippl, Stefan; Vijay, Saurabh; Braun, Matthias

doi:10.1017/jog.2018.70

Cited by 37 publications

(31 citation statements)

References 49 publications

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“…Debris-covered glacier outlines are also manually corrected according to respective elevation change fields and high-resolution satellite images (Google Earth). For the period 2013-2014, debris-covered glacier tongues are additionally compared with coherence estimates 38 of Sentinel 1 image pairs from 2015 to distinguish debris-covered ice from rocks.…”

Section: Methodsmentioning

confidence: 99%

Rapid glacier retreat and downwasting throughout the European Alps in the early 21st century

et al. 2020

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Mountain glaciers are known to be strongly affected by global climate change. Here we compute temporally consistent changes in glacier area, surface elevation and ice mass over the entire European Alps between 2000 and 2014. We apply remote sensing techniques on an extensive database of optical and radar imagery covering 93% of the total Alpine glacier volume. Our results reveal rapid glacier retreat across the Alps (−39 km² a −1) with regionally variable ice thickness changes (−0.5 to −0.9 m a −1). The strongest downwasting is observed in the Swiss Glarus and Lepontine Alps with specific mass change rates up to −1.03 m.w.e. a −1. For the entire Alps a mass loss of 1.3 ± 0.2 Gt a −1 (2000-2014) is estimated. Compared to previous studies, our estimated mass changes are similar for the central Alps, but less negative for the lower mountain ranges. These observations provide important information for future research on various socioeconomic impacts like water resource management, risk assessments and tourism.

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Section: Methodsmentioning

confidence: 99%

Rapid glacier retreat and downwasting throughout the European Alps in the early 21st century

et al. 2020

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“…The detection of the debris-covered glacier termini extents in the Cordillera Blanca is difficult using multi-spectral imagery. Therefore, we generated SAR coherence maps from repeat-pass SAR acquisitions to distinguish the debriscovered ice from the surrounding ice-free areas (Atwood et al, 2010;Lippl et al, 2018). The surface structure of the debris-covered glacier areas changes over time due to the dynamics and melting of the underlying ice.…”

Section: Glacier Inventorymentioning

confidence: 99%

“…For example, the bofedales (high-T. Seehaus et al: Changes of the tropical glaciers throughout Peru between 2000 and 2016 altitude wetlands in the Andes) are very sensitive to changes in glacier runoff and a depletion of the meltwater is likely to cause them to shrink (Polk et al, 2017). Additionally, the glacier retreat leads to the formation and extension of proglacial lakes (Hanshaw and Bookhagen, 2014;Lopez et al, 2010) threatening downstream areas due to their potential to cause glacier lake outburst floods (GLOFs). In the Cordillera Blanca, several GLOFs have harmed local communities in the past.…”

Section: Introductionmentioning

confidence: 99%

Changes of the tropical glaciers throughout Peru between 2000 and 2016 – mass balance and area fluctuations

et al. 2019

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Abstract. Glaciers in tropical regions are very sensitive to climatic variations and thus strongly affected by climate change. The majority of the tropical glaciers worldwide are located in the Peruvian Andes, which have shown significant ice loss in the last century. Here, we present the first multi-temporal, region-wide survey of geodetic mass balances and glacier area fluctuations throughout Peru covering the period 2000–2016. Glacier extents are derived from Landsat imagery by performing automatic glacier delineation based on a combination of the NDSI and band ratio method and final manual inspection and correction. The mapping of debris-covered glacier extents is supported by synthetic aperture radar (SAR) coherence information. A total glacier area loss of -548.5±65.7 km2 (−29 %, −34.3 km2 a−1) is obtained for the study period. Using interferometric satellite SAR acquisitions, bi-temporal geodetic mass balances are derived. An average specific mass balance of -296±41 kg m−2 a−1 is found throughout Peru for the period 2000–2016. However, there are strong regional and temporal differences in the mass budgets ranging from 45±97 to -752±452 kg m−2 a−1. The ice loss increased towards the end of the observation period. Between 2013 and 2016, a retreat of the glacierized area of -203.8±65.7 km2 (−16 %, −101.9 km2 a−1) is mapped and the average mass budget amounts to -660±178 kg m−2 a−1. The glacier changes revealed can be attributed to changes in the climatic settings in the study region, derived from ERA-Interim reanalysis data and the Oceanic Nino Index. The intense El Niño activities in 2015/16 are most likely the trigger for the increased change rates in the time interval 2013–2016. Our observations provide fundamental information on the current dramatic glacier changes for local authorities and for the calibration and validation of glacier change projections.

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“…Therefore, we generated SAR coherence maps from repeat-pass SAR acquisitions to distinguish the debris-covered ice from the surrounding ice-free areas (Atwood et al, 2010;Lippl et al, 2018). The surface structure of the debris-covered glacier (Paul et al, 2013).…”

Section: Glacier Inventorymentioning

confidence: 99%

Changes of the tropical glaciers throughout Peru between 2000 and 2016 – Mass balance and area fluctuations

Seehaus¹,

Malz²,

Sommer³

et al. 2019

Preprint

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Abstract. Glaciers in tropical regions are very sensitive to climatic variations and thus strongly affected by climate change. The majority of the tropical glaciers worldwide are located in the Peruvian Andes, which have shown significant ice loss in the last century. Here, we present the first multi-temporal, region wide survey of geodetic mass balances and glacier area fluctuations throughout Peru covering the period 2000–2016. Glacier extents are derived from Landsat imagery by performing automatic glacier delineation based on a combination of the NDSI and band ratio method and final manual inspection and correction. A total glacier area loss of −548.5 ± 65.7 km2 (−29 %, −34.3 km2 a−1) is obtained for the study period. Using interferometric satellite SAR acquisitions, bi-temporal geodetic mass balances are derived. An average specific mass balance of −357 ± 43 kg m−2 a−1 is found throughout Peru for the period 2000–2016. However, there are strong regional and temporal differences in the mass budgets ranging from 68 ± 102 kg m−2 a−1 to −990 ± 476 kg m−2 a−1. The ice loss increased towards the end of the observation period. Between 2013 and 2016, a retreat of the glaciated area of −203.8 ± 65.7 km2 (− 16 %, −101.9 km2 a−1) is mapped and the average mass budget amounts to −836 ± 188 kg m−2 a−1. The glacier changes revealed can be attributed to changes in the climatic settings in the study region, derived from ERA-Interim reanalysis data and the Oceanic Niño Index. The intense El Niño activities in 2015/16 are most likely the trigger for the increased change rates in the time interval 2013–2016. Our observations provide fundamental information on the current dramatic glacier changes for local authorities and for the calibration and validation of glacier change projections.

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Automatic delineation of debris-covered glaciers using InSAR coherence derived from X-, C- and L-band radar data: a case study of Yazgyl Glacier

Cited by 37 publications

References 49 publications

Rapid glacier retreat and downwasting throughout the European Alps in the early 21st century

Rapid glacier retreat and downwasting throughout the European Alps in the early 21st century

Changes of the tropical glaciers throughout Peru between 2000 and 2016 – mass balance and area fluctuations

Changes of the tropical glaciers throughout Peru between 2000 and 2016 – Mass balance and area fluctuations

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