Three Decades of Volume Change of a Small Greenlandic Glacier Using Ground Penetrating Radar, Structure from Motion, and Aerial Photogrammetry

Marcer, Marco; Stentoft, Peter Alexander; Bjerre, Elisa; Cimoli, Emiliano; Bjørk, Anders A.; Stenseng, Lars; Machguth, Horst

doi:10.1657/aaar0016-049

Cited by 21 publications

(20 citation statements)

References 47 publications

(44 reference statements)

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“…The only requirements for co-registration are spatially similar and overlapping HI and RGB imagery and good accuracy for the RGB orthomosaic reference. Advances in camera calibration and triangulation procedures permit the generation of RGB orthomosaics with high geometric fidelity using a limited amount of GCPs and/or consumer-grade navigation data [60,61,84]. Although a more accurate assessment is still required, the western transect RGB orthomosaic resulted in a highly resolved and metrically scaled photogrammetric model which could be used for co-registration for example ( Figures 5 and 6a,b).…”

Section: System Performance and Future Developmentsmentioning

confidence: 99%

An Under-Ice Hyperspectral and RGB Imaging System to Capture Fine-Scale Biophysical Properties of Sea Ice

et al. 2019

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Sea-ice biophysical properties are characterized by high spatio-temporal variability ranging from the meso-to the millimeter scale. Ice coring is a common yet coarse point sampling technique that struggles to capture such variability in a non-invasive manner. This hinders quantification and understanding of ice algae biomass patchiness and its complex interaction with some of its sea ice physical drivers. In response to these limitations, a novel under-ice sled system was designed to capture proxies of biomass together with 3D models of bottom topography of land-fast sea-ice. This system couples a pushbroom hyperspectral imaging (HI) sensor with a standard digital RGB camera and was trialed at Cape Evans, Antarctica. HI aims to quantify per-pixel chlorophyll-a content and other ice algae biological properties at the ice-water interface based on light transmitted through the ice. RGB imagery processed with digital photogrammetry aims to capture under-ice structure and topography. Results from a 20 m transect capturing a 0.61 m wide swath at sub-mm spatial resolution are presented. We outline the technical and logistical approach taken and provide recommendations for future deployments and developments of similar systems. A preliminary transect subsample was processed using both established and novel under-ice bio-optical indices (e.g., normalized difference indexes and the area normalized by the maximal band depth) and explorative analyses (e.g., principal component analyses) to establish proxies of algal biomass. This first deployment of HI and digital photogrammetry under-ice provides a proof-of-concept of a novel methodology capable of delivering non-invasive and highly resolved estimates of ice algal biomass in-situ, together with some of its environmental drivers. Nonetheless, various challenges and limitations remain before our method can be adopted across a range of sea-ice conditions. Our work concludes with suggested solutions to these challenges and proposes further method and system developments for future research.

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Section: System Performance and Future Developmentsmentioning

confidence: 99%

An Under-Ice Hyperspectral and RGB Imaging System to Capture Fine-Scale Biophysical Properties of Sea Ice

et al. 2019

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“…However, studies on Late Pleistocene and Holocene fluctuations of Greenland's GICs have been spatially isolated (e.g., Kelly et al, 2008;Larsen et al, 2017;Möller et al, 2010), often focusing on large marine-terminating or tidewater margins. Consequently, research on mass changes in Greenland GICs (e.g., Bjørk et al, 2012;Larsen et al, 2017;Marcer et al, 2017;Rinne et al, 2011;von Albedyll et al, 2018;Weidick, 1968;Yde et al, 2014;Yde & Knudsen, 2007) has been spatially disparate and temporally fragmented. The most spatially extensive work is by Bjørk et al (2018) who provided a regional comparison of 334 GIC length changes in east and west Greenland and who showed pervasive glacier length reductions.…”

Section: 1029/2018gl081383mentioning

confidence: 99%

Accelerated Volume Loss in Glacier Ablation Zones of NE Greenland, Little Ice Age to Present

Carrivick

Boston

King

et al. 2019

Geophysical Research Letters

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Mountain glaciers at the periphery of the Greenland ice sheet are a crucial freshwater and sediment source to the North Atlantic and strongly impact Arctic terrestrial, fjord, and coastal biogeochemical cycles. In this study we mapped the extent of 1,848 mountain glaciers in NE Greenland at the Little Ice Age. We determined area and volume changes for the time periods Little Ice Age to 1980s and 1980s to 2014 and equilibrium line altitudes. There was at least 172.76 ± 34.55‐km3 volume lost between 1910 and 1980s, that is, a rate of 2.61 ± 0.52 km3/year. Between 1980s and 2014 the volume lost was 90.55 ± 18.11 km3, that is, a rate of 3.22 ± 0.64 km3/year, implying an increase of ~23% in the rate of ice volume loss. Overall, at least ~7% of mass loss from Greenland mountain glaciers and ice caps has come from the NE sector.

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“…SfM photogrammetry allowed us to measure changes in thickness in the Pilatte glacier over the last few decades from historical aerial photographs. This method has recently become popular (Kappas, 2011;Marcer et al, 2017b;Vargo et al, 2017;Fugazza et al, 2018). Some other studies have combined terrestrial photogrammetry and TLS data for the reconstruction of detached rock volumes in high mountain environments (Curtaz et al, 2014;Guerin et al, 2017).…”

Section: Aerial Sfm Photogrammetrymentioning

confidence: 99%

Paraglacial Rock Slope Adjustment Beneath a High Mountain Infrastructure—The Pilatte Hut Case Study (Écrins Mountain Range, France)

Duvillard¹,

Ravanel²,

Deline³

et al. 2018

Front. Earth Sci.

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Landslides triggered by shrinking glaciers are an expected outcome of global climate change and they pose a significant threat to inhabitants and infrastructure in mountain valleys. In this study we document the rock slope movement that has affected the Pilatte hut (2,572 m a.s.l.) in the Écrins range (French alps) since the 1980s. We reconstructed the geometry of the unstable rock mass using Terrestrial Laser Scanning and quantified the unstable volume (∼400,000 m 3 ). Field observations and annual crack surveys have been used to identify the dynamics of past movements. These movements initiated in the late 1980s and have accelerated since 2000. The current trend seems to be toward a relative stabilization. Reconstruction of the glacier surface using past images taken since 1960 and "Structure from Motion" photogrammetry showed that the glacier probably applied stresses to the rock slope during its short-lived advance during the 1980s, followed by debuttressing caused by rapid surface lowering until the present day. The relationship between observed crack propagation and glacier surface change suggests that the rock slope instability is a paraglacial response to glacier surface changes, and highlights that such responses can occur within a decade of glacier change.

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Three Decades of Volume Change of a Small Greenlandic Glacier Using Ground Penetrating Radar, Structure from Motion, and Aerial Photogrammetry

Cited by 21 publications

References 47 publications

An Under-Ice Hyperspectral and RGB Imaging System to Capture Fine-Scale Biophysical Properties of Sea Ice

An Under-Ice Hyperspectral and RGB Imaging System to Capture Fine-Scale Biophysical Properties of Sea Ice

Accelerated Volume Loss in Glacier Ablation Zones of NE Greenland, Little Ice Age to Present

Paraglacial Rock Slope Adjustment Beneath a High Mountain Infrastructure—The Pilatte Hut Case Study (Écrins Mountain Range, France)

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