Digital elevation model and orthophotographs of Greenland based on aerial photographs from 1978–1987

Korsgaard, Niels J.; Nuth, Christopher; Khan, Shfaqat Abbas; Kjeldsen, Kristian K.; Bjørk, Anders A.; Schomacker, Anders; Kjær, Kurt H.

doi:10.1038/sdata.2016.32

Cited by 95 publications

(138 citation statements)

References 35 publications

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“…SPOT-1 scenes were also georeferenced to 2015 Landsat Imagery. Additionally, we used aerial photographs (2 m resolution), which were provided orthorectified by Korsgaard et al (2016). These covered all study glaciers between Humboldt 15 east to L. Bistrup Brae in 1978, and Harald Moltke Brae, Heilprin and Tracy Glaciers in NW Greenland in 1985 (Korsgaard et al, 2016).…”

Section: Data Sourcesmentioning

confidence: 99%

Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015

Hill¹,

Carr²,

Stokes³

et al. 2018

Preprint

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The Greenland Ice Sheet (GrIS) is losing mass in response to recent climatic and oceanic warming. Since the mid-1990s, marine-terminating outlet glaciers across the GrIS have retreated, accelerated and thinned, but recent changes in northern 10Greenland have been comparatively understudied. Consequently, the dynamic response (i.e. changes in surface elevation and velocity) of these outlet glaciers to changes at their termini, particularly calving from floating ice tongues, remains unknown.Here we use satellite imagery and historical maps to produce an unprecedented 68-year record of terminus change across 18 major outlet glaciers and combine this with previously published surface elevation and velocity datasets. Overall, recent (1995Overall, recent ( -2015 retreat rates were higher than at any time in the previous 47 years, but change-point analysis reveals three categories of 15 frontal position change: (i) minimal change followed by steady and continuous retreat, (ii) minimal change followed by a switch to a period of short-lived rapid retreat, (iii) glaciers that underwent cycles of advance and retreat. Furthermore, these categories appear to be linked to the terminus type, with those in category (i) having grounded termini and those in category (ii) characterised by floating ice tongues. We interpret glaciers in category (iii) as surge-type. Glacier geometry (e.g. fjord width and basal topography) is also an important influence on the dynamic re-adjustment of glaciers to changes at their termini. 20Taken together, the loss of several ice tongues and the recent acceleration in the retreat of numerous marine-terminating glaciers suggests northern Greenland is undergoing rapid change and could soon impact on some large catchments that have capacity to contribute an important component to sea level rise.

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Section: Data Sourcesmentioning

confidence: 99%

Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015

Hill¹,

Carr²,

Stokes³

et al. 2018

Preprint

View full text Add to dashboard Cite

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“…A 25 m DEM and 2 m orthophotograph were produced for the entire ice-free parts of Greenland and the margin of the ice sheet (Korsgaard et al, 2016). Here we used the 1985 images to create an additional DEM in 10 m horizontal resolution (Fig.…”

Section: Aerial Demmentioning

confidence: 99%

“…The Kolmogorov- proach described in Korsgaard et al (2016), which consists of using GPS ground control points measured as part of the GPS-based REFGR Greenlandic reference network. Using the software SOCET SET 5.6 from BAE-Systems, multiple DEMs were generated using a suite of different strategies for automated terrain extraction to account for low contrast areas in the photos.…”

Section: Evaluation Of Dem Accuracy and Resolutionmentioning

confidence: 99%

“…Aerial photographs recorded in the 1970s and 1980s, however, have recently been reanalyzed, and a DEM of known accuracy and time stamp, for all of the coastal areas of Greenland, has been established (Kjaer et al, 2012;Korsgaard et al, 2016). Provided recent measurements of surface elevation are available, the 1970s/1980s DEM could provide a baseline to measure surface elevation changes of Greenland glaciers over the last approximately three decades.…”

mentioning

confidence: 99%

“…We estimated volume change of Aqqutikitsoq glacier based on surface elevation changes from 1985 to 2014, determined from comparing the newly generated historical DEM (Korsgaard et al, 2016) to a 2014 DEM generated using SfM. Furthermore, we performed a ground penetrating radar (GPR) survey to measure ice thickness distribution over the entire glacier surface and to calculate total ice volume.…”

mentioning

confidence: 99%

See 2 more Smart Citations

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

Marcer

Stentoft

Bjerre

et al. 2017

Arctic, Antarctic, and Alpine Research

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Open Access -This work is licensed under a Creative Commons Attribution 4.0 (CC BY 4.0) International license.© . The computations are challenged by a relatively large fraction of the 1985 DEM (~50% of the glacier surface) being deemed unreliable owing to low contrast (snow cover) in the 1985 aerial photography. To address this issue, surface elevation in low contrast areas was measured manually at point locations and interpolated using a universal kriging approach. We conclude that ground-based SfM is well suited to establish high-quality DEMs of smaller glaciers. Provided favorable topography, the approach constitutes a viable alternative where the use of drones is not possible. Our investigations constitute the first glacier on Greenland's west coast where ice volume was determined and volume change calculated. The glacier's thinning rate is comparable to, for example, the Swiss Alps and underlines that arctic glaciers are subject to fast changes.

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Ice‐dammed lake drainage in west Greenland: Drainage pattern and implications on ice flow and bedrock motion

Kjeldsen

Khan

Bjørk

et al. 2017

Geophysical Research Letters

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Ice‐dammed lakes drain frequently in Greenland, but the impacts of these events differ between sites. Here we study the quasi‐cyclic behavior of the ~40 km2 Lake Tininnilik in west Greenland and its impact on ice flow and crustal deformation. Data reveal rapid drainage of 1.83 ± 0.17 km3 of water in less than 7 days in 2010, leading to a speedup of the damming glacier, and an instantaneous modeled elastic bedrock uplift of 18.6 ± 0.1 mm confirmed by an independent lakeside GPS record. Since ice‐dammed lakes are common on Greenland, our results highlight the importance of including other sources of surface loading in addition to ice mass change, when assessing glacial isostatic adjustment or elastic rebound using geodetic data. Moreover, the results illustrates a linkage between subglacial discharge and ice surface velocity, important for assessing ice flux, and thus mass balance, in a future warming climate.

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Digital elevation model and orthophotographs of Greenland based on aerial photographs from 1978–1987

Cited by 95 publications

References 35 publications

Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015

Dynamic changes in outlet glaciers in northern Greenland from 1948 to 2015

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

Ice‐dammed lake drainage in west Greenland: Drainage pattern and implications on ice flow and bedrock motion

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