Articles | Volume 10, issue 1
The Cryosphere, 10, 159–177, 2016
https://doi.org/10.5194/tc-10-159-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Special issue: Interactions between climate change and the Cryosphere: SVALI,...
The Cryosphere, 10, 159–177, 2016
https://doi.org/10.5194/tc-10-159-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article 19 Jan 2016
Research article | 19 Jan 2016
Geodetic mass balance record with rigorous uncertainty estimates deduced from aerial photographs and lidar data – Case study from Drangajökull ice cap, NW Iceland
E. Magnússon et al.
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Eyjólfur Magnússon, Finnur Pálsson, Magnús T. Gudmundsson, Thórdís Högnadóttir, Cristian Rossi, Thorsteinn Thorsteinsson, Benedikt G. Ófeigsson, Erik Sturkell, and Tómas Jóhannesson
The Cryosphere, 15, 3731–3749, https://doi.org/10.5194/tc-15-3731-2021, https://doi.org/10.5194/tc-15-3731-2021, 2021
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We present a unique insight into the shape and development of a subglacial lake over a 7-year period, using repeated radar survey. The lake collects geothermal meltwater, which is released in semi-regular floods, often referred to as jökulhlaups. The applicability of our survey approach to monitor the water stored in the lake for a better assessment of the potential hazard of jökulhlaups is demonstrated by comparison with independent measurements of released water volume during two jökulhlaups.
Joaquín M. C. Belart, Etienne Berthier, Eyjólfur Magnússon, Leif S. Anderson, Finnur Pálsson, Thorsteinn Thorsteinsson, Ian M. Howat, Guðfinna Aðalgeirsdóttir, Tómas Jóhannesson, and Alexander H. Jarosch
The Cryosphere, 11, 1501–1517, https://doi.org/10.5194/tc-11-1501-2017, https://doi.org/10.5194/tc-11-1501-2017, 2017
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Sub-meter satellite stereo images (Pléiades and WorldView2) are used to accurately measure snow accumulation and winter mass balance of Drangajökull ice cap. This is done by creating and comparing accurate digital elevation models. A glacier-wide geodetic mass balance of 3.33 ± 0.23 m w.e. is derived between October 2014 and May 2015. This method could be easily transposable to remote glaciated areas where seasonal mass balance measurements (especially winter accumulation) are lacking.
E. Berthier, C. Vincent, E. Magnússon, Á. Þ. Gunnlaugsson, P. Pitte, E. Le Meur, M. Masiokas, L. Ruiz, F. Pálsson, J. M. C. Belart, and P. Wagnon
The Cryosphere, 8, 2275–2291, https://doi.org/10.5194/tc-8-2275-2014, https://doi.org/10.5194/tc-8-2275-2014, 2014
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We evaluate the potential of Pléiades sub-meter satellite stereo imagery to derive digital elevation models (DEMs) of glaciers and their elevation changes. The vertical precision of the DEMs is ±1 m, even ±0.5m on the flat glacier tongues. Similar precision levels are obtained in accumulation areas. Comparison of a Pléiades DEM with a SPOT5 DEM reveals the strongly negative region-wide mass balances of glaciers in the Mont Blanc area (-1.04±0.23m at 1 water equivalent) during 2003-2012.
Eyjólfur Magnússon, Finnur Pálsson, Magnús T. Gudmundsson, Thórdís Högnadóttir, Cristian Rossi, Thorsteinn Thorsteinsson, Benedikt G. Ófeigsson, Erik Sturkell, and Tómas Jóhannesson
The Cryosphere, 15, 3731–3749, https://doi.org/10.5194/tc-15-3731-2021, https://doi.org/10.5194/tc-15-3731-2021, 2021
Short summary
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We present a unique insight into the shape and development of a subglacial lake over a 7-year period, using repeated radar survey. The lake collects geothermal meltwater, which is released in semi-regular floods, often referred to as jökulhlaups. The applicability of our survey approach to monitor the water stored in the lake for a better assessment of the potential hazard of jökulhlaups is demonstrated by comparison with independent measurements of released water volume during two jökulhlaups.
Joaquín M. C. Belart, Etienne Berthier, Eyjólfur Magnússon, Leif S. Anderson, Finnur Pálsson, Thorsteinn Thorsteinsson, Ian M. Howat, Guðfinna Aðalgeirsdóttir, Tómas Jóhannesson, and Alexander H. Jarosch
The Cryosphere, 11, 1501–1517, https://doi.org/10.5194/tc-11-1501-2017, https://doi.org/10.5194/tc-11-1501-2017, 2017
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Sub-meter satellite stereo images (Pléiades and WorldView2) are used to accurately measure snow accumulation and winter mass balance of Drangajökull ice cap. This is done by creating and comparing accurate digital elevation models. A glacier-wide geodetic mass balance of 3.33 ± 0.23 m w.e. is derived between October 2014 and May 2015. This method could be easily transposable to remote glaciated areas where seasonal mass balance measurements (especially winter accumulation) are lacking.
H. Hannesdóttir, H. Björnsson, F. Pálsson, G. Aðalgeirsdóttir, and Sv. Guðmundsson
The Cryosphere, 9, 565–585, https://doi.org/10.5194/tc-9-565-2015, https://doi.org/10.5194/tc-9-565-2015, 2015
E. Berthier, C. Vincent, E. Magnússon, Á. Þ. Gunnlaugsson, P. Pitte, E. Le Meur, M. Masiokas, L. Ruiz, F. Pálsson, J. M. C. Belart, and P. Wagnon
The Cryosphere, 8, 2275–2291, https://doi.org/10.5194/tc-8-2275-2014, https://doi.org/10.5194/tc-8-2275-2014, 2014
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We evaluate the potential of Pléiades sub-meter satellite stereo imagery to derive digital elevation models (DEMs) of glaciers and their elevation changes. The vertical precision of the DEMs is ±1 m, even ±0.5m on the flat glacier tongues. Similar precision levels are obtained in accumulation areas. Comparison of a Pléiades DEM with a SPOT5 DEM reveals the strongly negative region-wide mass balances of glaciers in the Mont Blanc area (-1.04±0.23m at 1 water equivalent) during 2003-2012.
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MODIS thermal infrared (TIR) imagery provides promising data to study the rapid variations in the Arctic turbulent heat flux (THF). The accuracy of estimated THF, however, is low (especially for small leads) due to the coarse resolution of the MODIS TIR data. We train a deep neural network to enhance the spatial resolution of estimated THF over leads from MODIS TIR imagery. The method is found to be effective and can generate a result which is close to that derived from Landsat-8 TIR imagery.
Linlu Mei, Vladimir Rozanov, Christine Pohl, Marco Vountas, and John P. Burrows
The Cryosphere, 15, 2757–2780, https://doi.org/10.5194/tc-15-2757-2021, https://doi.org/10.5194/tc-15-2757-2021, 2021
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This paper presents a new snow property retrieval algorithm from satellite observations. This is Part 1 of two companion papers and shows the method description and sensitivity study. The paper investigates the major factors, including the assumptions of snow optical properties, snow particle distribution and atmospheric conditions (cloud and aerosol), impacting snow property retrievals from satellite observation.
Linlu Mei, Vladimir Rozanov, Evelyn Jäkel, Xiao Cheng, Marco Vountas, and John P. Burrows
The Cryosphere, 15, 2781–2802, https://doi.org/10.5194/tc-15-2781-2021, https://doi.org/10.5194/tc-15-2781-2021, 2021
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This paper presents a new snow property retrieval algorithm from satellite observations. This is Part 2 of two companion papers and shows the results and validation. The paper performs the new retrieval algorithm on the Sea and Land
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Joan Antoni Parera-Portell, Raquel Ubach, and Charles Gignac
The Cryosphere, 15, 2803–2818, https://doi.org/10.5194/tc-15-2803-2021, https://doi.org/10.5194/tc-15-2803-2021, 2021
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We describe a new method to map sea ice and water at 500 m resolution using data acquired by the MODIS sensors. The strength of this method is that it achieves high-accuracy results and is capable of attenuating unwanted resolution-breaking effects caused by cloud masking. Our resulting March and September monthly aggregates reflect the loss of sea ice in the European Arctic during the 2000–2019 period and show the algorithm's usefulness as a sea ice monitoring tool.
Joseph A. MacGregor, Michael Studinger, Emily Arnold, Carlton J. Leuschen, Fernando Rodríguez-Morales, and John D. Paden
The Cryosphere, 15, 2569–2574, https://doi.org/10.5194/tc-15-2569-2021, https://doi.org/10.5194/tc-15-2569-2021, 2021
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We combine multiple recent global glacier datasets and extend one of them (GlaThiDa) to evaluate past performance of radar-sounding surveys of the thickness of Earth's temperate glaciers. An empirical envelope for radar performance as a function of center frequency is determined, its limitations are discussed and its relevance to future radar-sounder survey and system designs is considered.
Robbie D. C. Mallett, Julienne C. Stroeve, Michel Tsamados, Jack C. Landy, Rosemary Willatt, Vishnu Nandan, and Glen E. Liston
The Cryosphere, 15, 2429–2450, https://doi.org/10.5194/tc-15-2429-2021, https://doi.org/10.5194/tc-15-2429-2021, 2021
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We re-estimate pan-Arctic sea ice thickness (SIT) values by combining data from the Envisat and CryoSat-2 missions with data from a new, reanalysis-driven snow model. Because a decreasing amount of ice is being hidden below the waterline by the weight of overlying snow, we argue that SIT may be declining faster than previously calculated in some regions. Because the snow product varies from year to year, our new SIT calculations also display much more year-to-year variability.
Renée Mie Fredensborg Hansen, Eero Rinne, Sinéad Louise Farrell, and Henriette Skourup
The Cryosphere, 15, 2511–2529, https://doi.org/10.5194/tc-15-2511-2021, https://doi.org/10.5194/tc-15-2511-2021, 2021
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Ice navigators rely on timely information about ice conditions to ensure safe passage through ice-covered waters, and one parameter, the degree of ice ridging (DIR), is particularly useful. We have investigated the possibility of estimating DIR from the geolocated photons of ICESat-2 (IS2) in the Bay of Bothnia, show that IS2 retrievals from different DIR areas differ significantly, and present some of the first steps in creating sea ice applications beyond e.g. thickness retrieval.
Ahmad Hojatimalekshah, Zachary Uhlmann, Nancy F. Glenn, Christopher A. Hiemstra, Christopher J. Tennant, Jake D. Graham, Lucas Spaete, Arthur Gelvin, Hans-Peter Marshall, James P. McNamara, and Josh Enterkine
The Cryosphere, 15, 2187–2209, https://doi.org/10.5194/tc-15-2187-2021, https://doi.org/10.5194/tc-15-2187-2021, 2021
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We describe the relationships between snow depth, vegetation canopy, and local-scale processes during the snow accumulation period using terrestrial laser scanning (TLS). In addition to topography and wind, our findings suggest the importance of fine-scale tree structure, species type, and distributions on snow depth. Snow depth increases from the canopy edge toward the open areas, but wind and topographic controls may affect this trend. TLS data are complementary to wide-area lidar surveys.
Luisa von Albedyll, Christian Haas, and Wolfgang Dierking
The Cryosphere, 15, 2167–2186, https://doi.org/10.5194/tc-15-2167-2021, https://doi.org/10.5194/tc-15-2167-2021, 2021
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Convergent sea ice motion produces a thick ice cover through ridging. We studied sea ice deformation derived from high-resolution satellite imagery and related it to the corresponding thickness change. We found that deformation explains the observed dynamic thickness change. We show that deformation can be used to model realistic ice thickness distributions. Our results revealed new relationships between thickness redistribution and deformation that could improve sea ice models.
Maximillian Van Wyk de Vries and Andrew D. Wickert
The Cryosphere, 15, 2115–2132, https://doi.org/10.5194/tc-15-2115-2021, https://doi.org/10.5194/tc-15-2115-2021, 2021
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We can measure glacier flow and sliding velocity by tracking patterns on the ice surface in satellite images. The surface velocity of glaciers provides important information to support assessments of glacier response to climate change, to improve regional assessments of ice thickness, and to assist with glacier fieldwork. Our paper describes Glacier Image Velocimetry (GIV), a new, easy-to-use, and open-source toolbox for calculating high-resolution velocity time series for any glacier on earth.
Simon Zwieback and Franz J. Meyer
The Cryosphere, 15, 2041–2055, https://doi.org/10.5194/tc-15-2041-2021, https://doi.org/10.5194/tc-15-2041-2021, 2021
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Thawing of ice-rich permafrost leads to subsidence and slumping, which can compromise Arctic infrastructure. However, we lack fine-scale maps of permafrost ground ice, chiefly because it is usually invisible at the surface. We show that subsidence at the end of summer serves as a
fingerprintwith which near-surface permafrost ground ice can be identified. As this can be done with satellite data, this method may help improve ground ice maps and thus sustainably steward the Arctic.
Georg Pointner, Annett Bartsch, Yury A. Dvornikov, and Alexei V. Kouraev
The Cryosphere, 15, 1907–1929, https://doi.org/10.5194/tc-15-1907-2021, https://doi.org/10.5194/tc-15-1907-2021, 2021
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This study presents strong new indications that regions of anomalously low backscatter in C-band synthetic aperture radar (SAR) imagery of ice of Lake Neyto in northwestern Siberia are related to strong emissions of natural gas. Spatio-temporal dynamics and potential scattering and formation mechanisms are assessed. It is suggested that exploiting the spatial and temporal properties of Sentinel-1 SAR data may be beneficial for the identification of similar phenomena in other Arctic lakes.
Rasmus T. Tonboe, Vishnu Nandan, John Yackel, Stefan Kern, Leif Toudal Pedersen, and Julienne Stroeve
The Cryosphere, 15, 1811–1822, https://doi.org/10.5194/tc-15-1811-2021, https://doi.org/10.5194/tc-15-1811-2021, 2021
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A relationship between the Ku-band radar scattering horizon and snow depth is found using a radar scattering model. This relationship has implications for (1) the use of snow climatology in the conversion of satellite radar freeboard into sea ice thickness and (2) the impact of variability in measured snow depth on the derived ice thickness. For both 1 and 2, the impact of using a snow climatology versus the actual snow depth is relatively small.
Daniel Cheng, Wayne Hayes, Eric Larour, Yara Mohajerani, Michael Wood, Isabella Velicogna, and Eric Rignot
The Cryosphere, 15, 1663–1675, https://doi.org/10.5194/tc-15-1663-2021, https://doi.org/10.5194/tc-15-1663-2021, 2021
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Tracking changes in Greenland's glaciers is important for understanding Earth's climate, but it is time consuming to do so by hand. We train a program, called CALFIN, to automatically track these changes with human levels of accuracy. CALFIN is a special type of program called a neural network. This method can be applied to other glaciers and eventually other tracking tasks. This will enhance our understanding of the Greenland Ice Sheet and permit better models of Earth's climate.
Stephan Paul and Marcus Huntemann
The Cryosphere, 15, 1551–1565, https://doi.org/10.5194/tc-15-1551-2021, https://doi.org/10.5194/tc-15-1551-2021, 2021
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Cloud cover in the polar regions is difficult to identify at night when using only thermal-infrared data. This is due to occurrences of warm clouds over cold sea ice and cold clouds over warm sea ice. Especially the standard MODIS cloud mask frequently tends towards classifying open water and/or thin ice as cloud cover. Using a neural network, we present an improved discrimination between sea-ice, open-water and/or thin-ice, and cloud pixels in nighttime MODIS thermal-infrared satellite data.
Jennifer M. Jacobs, Adam G. Hunsaker, Franklin B. Sullivan, Michael Palace, Elizabeth A. Burakowski, Christina Herrick, and Eunsang Cho
The Cryosphere, 15, 1485–1500, https://doi.org/10.5194/tc-15-1485-2021, https://doi.org/10.5194/tc-15-1485-2021, 2021
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This pilot study describes a proof of concept for using lidar on an unpiloted aerial vehicle to map shallow snowpack (< 20 cm) depth in open terrain and forests. The 1 m2 resolution snow depth map, generated by subtracting snow-off from snow-on lidar-derived digital terrain models, consistently had 0.5 to 1 cm precision in the field, with a considerable reduction in accuracy in the forest. Performance depends on the point cloud density and the ground surface variability and vegetation.
Xiaodan Wu, Kathrin Naegeli, Carlo Marin, and Stefan Wunderle
The Cryosphere Discuss., https://doi.org/10.5194/tc-2021-46, https://doi.org/10.5194/tc-2021-46, 2021
Revised manuscript accepted for TC
B30Iceberg Observed by Satellite Altimetry and Imagery
Anne Braakmann-Folgmann, Andrew Shepherd, and Andy Ridout
The Cryosphere Discuss., https://doi.org/10.5194/tc-2021-13, https://doi.org/10.5194/tc-2021-13, 2021
Revised manuscript accepted for TC
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We investigate the disintegration of the B30 iceberg using satellite remote sensing and find that the iceberg lost 378 km3 of ice in 6.5 years, corresponding to 80 % of its initial volume. About two thirds are due to fragmentation at the sides and one third is due to melting at the iceberg's base. The release of fresh water and nutrients impacts ocean circulation, sea ice formation and biological production. Moreover, we show that adding a snow layer is important when deriving iceberg thickness.
Laurence Gray
The Cryosphere, 15, 1005–1014, https://doi.org/10.5194/tc-15-1005-2021, https://doi.org/10.5194/tc-15-1005-2021, 2021
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A total of 9 years of ice velocity and surface height data obtained from a variety of satellites are used to estimate the water run-off from the northern arm of the Humboldt Glacier in NW Greenland. This represents the first direct measurement of water run-off from a large Greenland glacier, and it complements the iceberg calving flux measurements also based on satellite data. This approach should help improve mass loss estimates for some large Greenland glaciers.
Andreas Kääb, Tazio Strozzi, Tobias Bolch, Rafael Caduff, Håkon Trefall, Markus Stoffel, and Alexander Kokarev
The Cryosphere, 15, 927–949, https://doi.org/10.5194/tc-15-927-2021, https://doi.org/10.5194/tc-15-927-2021, 2021
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We present a map of rock glacier motion over parts of the northern Tien Shan and time series of surface speed for six of them over almost 70 years.
This is by far the most detailed investigation of this kind available for central Asia.
We detect a 2- to 4-fold increase in rock glacier motion between the 1950s and present, which we attribute to atmospheric warming.
Relative to the shrinking glaciers in the region, this implies increased importance of periglacial sediment transport.
Elisabeth D. Hafner, Frank Techel, Silvan Leinss, and Yves Bühler
The Cryosphere, 15, 983–1004, https://doi.org/10.5194/tc-15-983-2021, https://doi.org/10.5194/tc-15-983-2021, 2021
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Satellites prove to be very valuable for documentation of large-scale avalanche periods. To test reliability and completeness, which has not been satisfactorily verified before, we attempt a full validation of avalanches mapped from two optical sensors and one radar sensor. Our results demonstrate the reliability of high-spatial-resolution optical data for avalanche mapping, the suitability of radar for mapping of larger avalanches and the unsuitability of medium-spatial-resolution optical data.
Xiongxin Xiao, Shunlin Liang, Tao He, Daiqiang Wu, Congyuan Pei, and Jianya Gong
The Cryosphere, 15, 835–861, https://doi.org/10.5194/tc-15-835-2021, https://doi.org/10.5194/tc-15-835-2021, 2021
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Daily time series and full space-covered sub-pixel snow cover area data are urgently needed for climate and reanalysis studies. Due to the fact that observations from optical satellite sensors are affected by clouds, this study attempts to capture dynamic characteristics of snow cover at a fine spatiotemporal resolution (daily; 6.25 km) accurately by using passive microwave data. We demonstrate the potential to use the passive microwave and the MODIS data to map the fractional snow cover area.
Andri Gunnarsson, Sigurdur M. Gardarsson, Finnur Pálsson, Tómas Jóhannesson, and Óli G. B. Sveinsson
The Cryosphere, 15, 547–570, https://doi.org/10.5194/tc-15-547-2021, https://doi.org/10.5194/tc-15-547-2021, 2021
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Surface albedo quantifies the fraction of the sunlight reflected by the surface of the Earth. During the melt season in the Northern Hemisphere solar energy absorbed by snow- and ice-covered surfaces is mainly controlled by surface albedo. For Icelandic glaciers, air temperature and surface albedo are the dominating factors governing annual variability of glacier surface melt. Satellite data from the MODIS sensor are used to create a data set spanning the glacier melt season.
Bryan Riel, Brent Minchew, and Ian Joughin
The Cryosphere, 15, 407–429, https://doi.org/10.5194/tc-15-407-2021, https://doi.org/10.5194/tc-15-407-2021, 2021
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The availability of large volumes of publicly available remote sensing data over terrestrial glaciers provides new opportunities for studying the response of glaciers to a changing climate. We present an efficient method for tracking changes in glacier speeds at high spatial and temporal resolutions from surface observations, demonstrating the recovery of traveling waves over Jakobshavn Isbræ, Greenland. Quantification of wave properties may ultimately enhance understanding of glacier dynamics.
Marco Bongio, Ali Nadir Arslan, Cemal Melih Tanis, and Carlo De Michele
The Cryosphere, 15, 369–387, https://doi.org/10.5194/tc-15-369-2021, https://doi.org/10.5194/tc-15-369-2021, 2021
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The capability of time-lapse photography to retrieve snow depth time series was tested. We demonstrated that this method can be efficiently used in three different case studies: two in the Italian Alps and one in a forested region of Finland, with an accuracy comparable to the most common methods such as ultrasonic sensors or manual measurements. We hope that this simple method based only on a camera and a graduated stake can enable snow depth measurements in dangerous and inaccessible sites.
Helmut Rott, Stefan Scheiblauer, Jan Wuite, Lukas Krieger, Dana Floricioiu, Paola Rizzoli, Ludivine Libert, and Thomas Nagler
The Cryosphere Discuss., https://doi.org/10.5194/tc-2020-380, https://doi.org/10.5194/tc-2020-380, 2021
Preprint under review for TC
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We studied relations between interferometric radar (InSAR) signals and snow properties and evaluated procedures for deriving the penetration bias of InSAR DEMs by inverting the signal coherence. Study site is Union Glacier in Antarctica. The data base comprises InSAR data of the TanDEM-X mission, topographic data from optical sensors and field measurements. The paper provides new insights on interferometric signal interactions with polar snow and on methods for correcting the penetration bias.
Lucie A. Eberhard, Pascal Sirguey, Aubrey Miller, Mauro Marty, Konrad Schindler, Andreas Stoffel, and Yves Bühler
The Cryosphere, 15, 69–94, https://doi.org/10.5194/tc-15-69-2021, https://doi.org/10.5194/tc-15-69-2021, 2021
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In spring 2018 in the alpine Dischma valley (Switzerland), we tested different industrial photogrammetric platforms for snow depth mapping. These platforms were high-resolution satellites, an airplane, unmanned aerial systems and a terrestrial system. Therefore, this study gives a general overview of the accuracy and precision of the different photogrammetric platforms available in space and on earth and their use for snow depth mapping.
Stephen E. L. Howell, Randall K. Scharien, Jack Landy, and Mike Brady
The Cryosphere, 14, 4675–4686, https://doi.org/10.5194/tc-14-4675-2020, https://doi.org/10.5194/tc-14-4675-2020, 2020
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Melt ponds form on the surface of Arctic sea ice during spring and have been shown to exert a strong influence on summer sea ice area. Here, we use RADARSAT-2 satellite imagery to estimate the predicted peak spring melt pond fraction in the Canadian Arctic Archipelago from 2009–2018. Our results show that RADARSAT-2 estimates of peak melt pond fraction can be used to provide predictive information about summer sea ice area within certain regions of the Canadian Arctic Archipelago.
Yuting Dong, Ji Zhao, Dana Floricioiu, Lukas Krieger, Thomas Fritz, and Michael Eineder
The Cryosphere Discuss., https://doi.org/10.5194/tc-2020-323, https://doi.org/10.5194/tc-2020-323, 2020
Preprint under review for TC
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We generated a consistent, gapless and high-resolution (12 m) topography product of the Antarctic Peninsula by combining the complementary advantages of two most recent high-resolution digital elevation model (DEM) products: the TanDEM-X DEM and the Reference Elevation Model of Antarctica. The generated DEM maintains the characteristics of the TanDEM-X DEM and has a better quality due to the correction of the residual height errors in the non-edited TanDEM-X DEM and will be freely available.
Chad A. Greene, Alex S. Gardner, and Lauren C. Andrews
The Cryosphere, 14, 4365–4378, https://doi.org/10.5194/tc-14-4365-2020, https://doi.org/10.5194/tc-14-4365-2020, 2020
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Seasonal variability is a fundamental characteristic of any Earth surface system, but we do not fully understand which of the world's glaciers speed up and slow down on an annual cycle. Such short-timescale accelerations may offer clues about how individual glaciers will respond to longer-term changes in climate, but understanding any behavior requires an ability to observe it. We describe how to use satellite image feature tracking to determine the magnitude and timing of seasonal ice dynamics.
Ingmar Nitze, Sarah W. Cooley, Claude R. Duguay, Benjamin M. Jones, and Guido Grosse
The Cryosphere, 14, 4279–4297, https://doi.org/10.5194/tc-14-4279-2020, https://doi.org/10.5194/tc-14-4279-2020, 2020
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In summer 2018, northwestern Alaska was affected by widespread lake drainage which strongly exceeded previous observations. We analyzed the spatial and temporal patterns with remote sensing observations, weather data and lake-ice simulations. The preceding fall and winter season was the second warmest and wettest on record, causing the destabilization of permafrost and elevated water levels which likely led to widespread and rapid lake drainage during or right after ice breakup.
Zachary Fair, Mark Flanner, Kelly M. Brunt, Helen Amanda Fricker, and Alex Gardner
The Cryosphere, 14, 4253–4263, https://doi.org/10.5194/tc-14-4253-2020, https://doi.org/10.5194/tc-14-4253-2020, 2020
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Ice on glaciers and ice sheets may melt and pond on ice surfaces in summer months. Detection and observation of these meltwater ponds is important for understanding glaciers and ice sheets, and satellite imagery has been used in previous work. However, image-based methods struggle with deep water, so we used data from the Ice, Clouds, and land Elevation Satellite-2 (ICESat-2) and the Airborne Topographic Mapper (ATM) to demonstrate the potential for lidar depth monitoring.
Ellyn M. Enderlin and Timothy C. Bartholomaus
The Cryosphere, 14, 4121–4133, https://doi.org/10.5194/tc-14-4121-2020, https://doi.org/10.5194/tc-14-4121-2020, 2020
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Accurate predictions of future changes in glacier flow require the realistic simulation of glacier terminus position change in numerical models. We use crevasse observations for 19 Greenland glaciers to explore whether the two commonly used crevasse depth models match observations. The models cannot reproduce spatial patterns, and we largely attribute discrepancies between modeled and observed depths to the models' inability to account for advection.
Maxim Lamare, Marie Dumont, Ghislain Picard, Fanny Larue, François Tuzet, Clément Delcourt, and Laurent Arnaud
The Cryosphere, 14, 3995–4020, https://doi.org/10.5194/tc-14-3995-2020, https://doi.org/10.5194/tc-14-3995-2020, 2020
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Terrain features found in mountainous regions introduce large errors into the calculation of the physical properties of snow using optical satellite images. We present a new model performing rapid calculations of solar radiation over snow-covered rugged terrain that we tested over a site in the French Alps. The results of the study show that all the interactions between sunlight and the terrain should be accounted for over snow-covered surfaces to correctly estimate snow properties from space.
Tim Carlsen, Gerit Birnbaum, André Ehrlich, Veit Helm, Evelyn Jäkel, Michael Schäfer, and Manfred Wendisch
The Cryosphere, 14, 3959–3978, https://doi.org/10.5194/tc-14-3959-2020, https://doi.org/10.5194/tc-14-3959-2020, 2020
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The angular reflection of solar radiation by snow surfaces is particularly anisotropic and highly variable. We measured the angular reflection from an aircraft using a digital camera in Antarctica in 2013/14 and studied its variability: the anisotropy increases with a lower Sun but decreases for rougher surfaces and larger snow grains. The applied methodology allows for a direct comparison with satellite observations, which generally underestimated the anisotropy measured within this study.
Lei Zheng, Chunxia Zhou, Tingjun Zhang, Qi Liang, and Kang Wang
The Cryosphere, 14, 3811–3827, https://doi.org/10.5194/tc-14-3811-2020, https://doi.org/10.5194/tc-14-3811-2020, 2020
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Snowmelt plays a key role in mass and energy balance in polar regions. In this study, we report on the spatial and temporal variations in the surface snowmelt over the Antarctic sea ice and ice sheet (pan-Antarctic region) based on AMSR-E and AMSR2. Melt detection on sea ice is improved by excluding the effect of open water. The decline in surface snowmelt on the Antarctic ice sheet was very likely linked with the enhanced summer Southern Annular Mode.
Hoyeon Shi, Byung-Ju Sohn, Gorm Dybkjær, Rasmus Tage Tonboe, and Sang-Moo Lee
The Cryosphere, 14, 3761–3783, https://doi.org/10.5194/tc-14-3761-2020, https://doi.org/10.5194/tc-14-3761-2020, 2020
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To estimate sea ice thickness from satellite freeboard measurements, snow depth information has been required; however, the snow depth estimate has been considered largely uncertain. We propose a new method to estimate sea ice thickness and snow depth simultaneously from freeboards by imposing a thermodynamic constraint. Obtained ice thicknesses and snow depths were consistent with airborne measurements, suggesting that uncertainty of ice thickness caused by uncertain snow depth can be reduced.
Sergey Samsonov, Kristy Tiampo, and Ryan Cassotto
The Cryosphere Discuss., https://doi.org/10.5194/tc-2020-257, https://doi.org/10.5194/tc-2020-257, 2020
Revised manuscript accepted for TC
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The direction and intensity of glacier surface flow adjust in response to a warming climate, causing sea level rise, seasonal flooding and droughts, changing landscapes and habitats. We developed a technique that measures the evolution of surface flow for an entire glaciated region in three-dimensions with high temporal and spatial resolutions and used it to map the temporal evolution of five glaciers in southeastern Alaska (Agassiz, Seward, Malaspina, Klutlan and Walsh) during 2016–2020.
Nicholas C. Wright, Chris M. Polashenski, Scott T. McMichael, and Ross A. Beyer
The Cryosphere, 14, 3523–3536, https://doi.org/10.5194/tc-14-3523-2020, https://doi.org/10.5194/tc-14-3523-2020, 2020
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This work presents a new dataset of sea ice surface fractions along NASA Operation IceBridge flight tracks created by processing hundreds of thousands of aerial images. These results are then analyzed to investigate the behavior of meltwater on first-year ice in comparison to multiyear ice. We find preliminary evidence that first-year ice frequently has a lower melt pond fraction than adjacent multiyear ice, contrary to established knowledge in the sea ice community.
Gemma M. Brett, Daniel Price, Wolfgang Rack, and Patricia J. Langhorne
The Cryosphere Discuss., https://doi.org/10.5194/tc-2020-286, https://doi.org/10.5194/tc-2020-286, 2020
Revised manuscript accepted for TC
Angus J. Dowson, Pascal Sirguey, and Nicolas J. Cullen
The Cryosphere, 14, 3425–3448, https://doi.org/10.5194/tc-14-3425-2020, https://doi.org/10.5194/tc-14-3425-2020, 2020
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Satellite observations over 19 years are used to characterise the spatial and temporal variability of surface albedo across the gardens of Eden and Allah, two of New Zealand’s largest ice fields. The variability in response of individual glaciers reveals the role of topographic setting and suggests that glaciers in the Southern Alps do not behave as a single climatic unit. There is evidence that the timing of the minimum surface albedo has shifted to later in the summer on 10 of the 12 glaciers.
Wolfgang Dierking, Harry L. Stern, and Jennifer K. Hutchings
The Cryosphere, 14, 2999–3016, https://doi.org/10.5194/tc-14-2999-2020, https://doi.org/10.5194/tc-14-2999-2020, 2020
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Monitoring deformation of sea ice is useful for studying effects of ice compression and divergent motion on the ice mass balance and ocean–ice–atmosphere interactions. In calculations of deformation parameters not only the measurement uncertainty of drift vectors has to be considered. The size of the area and the time interval used in the calculations have to be chosen within certain limits to make sure that the uncertainties of deformation parameters are smaller than their real magnitudes.
Cited articles
Aðalgeirsdóttir, G., Guðmundsson, S., Björnsson, H.,
Pálsson, F., Jóhannesson, T., Hannesdóttir, H., Sigurðsson,
S. Þ. and Berthier, E.: Modelling the 20th and 21st century evolution of Hoffellsjökull glacier, SE-Vatnajökull, Iceland, The Cryosphere, 5, 961–975, https://doi.org/10.5194/tc-5-961-2011, 2011.
Bauer, H. and Müller, J.: Heigh accuracy of blocks and bundle block
adjustment with additional parameters, Pres. Paper Comm. III. ISPRS 12th
Congress, Ottawa, 1972.
Berthier, E., Vincent, C., Magnússon, E., Gunnlaugsson, Á. Þ.,
Pitte, P., Le Meur, E., Masiokas, M., Ruiz, L., Pálsson, F., Belart, J. M.
C., and Wagnon, P.: Glacier topography and elevation changes derived from
Pléiades sub-meter stereo images, The Cryosphere, 8, 2275–2291,
https://doi.org/10.5194/tc-8-2275-2014, 2014.
Björnsson, H., Sveinbjörnsdóttir, Á. E.,
Daníelsdóttir, A. K., Snorrason, Á., Sigurðsson, B. D.,
Sveinbjörnsson, E. Viggósson, G., Sigurjónsson, J., Baldursson,
S., Þorvaldsdóttir S., and Jónsson, T.: Hnattrænar
loftslagsbreytingar og áhrif þeirra á Íslandi – Skýrsla
vísindanefndar um loftslagsbreytingar, Umhverfisráðuneytið,
The Icelandic Ministry for the Environment and Natural Resources, 118 pp.,
2008.
Björnsson, H., Pálsson, F., Guðmundsson, S., Magnússon, E.,
Aðalgeirsdóttir, G., Jóhannesson, T., Berthier, E.,
Sigurðsson, O., and Thorsteinsson, T.: Contribution of Icelandic ice caps
to sea level rise: trends and variability since the Little Ice Age, Geophys.
Res. Lett., 40, 1–5, https://doi.org/10.1002/grl.50278, 2013.
Cardellini, C., Chiodini, G., and Frondini, F.: Application of stochastic
simulation to CO2 flux from soil: mapping and quantification of gas
release, J. Geophys. Res., 108, ECV3–ECV1–13, 2003.
Cogley, J. G.: Geodetic and direct mass-balance measurements: comparison and
joint analysis, A. Glaciol., 50, 96–100, 2009.
Cogley, J. G., Hock, R., Rasmussen, L. A., Arendt, A. A., Bauder, A.,
Braithwaite, R. J., Jansson, P., Kaser, G., Möller, M., Nicholson L., and
Zemp, M.: Glossary of Glacier Mass Balance and Related Terms, IHP-VII
Technical Documents in Hydrology No. 86, IACS Contribution No. 2, UNESCO-IHP,
Paris, 2011.
Cox, L. H. and March, R. S.: Comparison of geodetic and glaciological
mass-balance techniques, Gulkana Glacier, Alaska, USA, J. Glaciol., 50,
363–370, 2004.
Crochet, P. and Jóhannesson, T.: A dataset of daily temperature in
Iceland for the period 1949–2010, Jökull, 61, 1–17, 2011.
Crochet, P., Jóhannesson, T., Jónsson, T., Sigurðsson, O.,
Björnsson, H., Pálsson F., and Barstad I.: Estimating the spatial
distribution of precipitation in Iceland using a linear model of orographic
precipitation. J. Hydrometeor., 8, 1285–1306, 2007.
Deutsch, C. V. and Journel, A. G.: GSLIB. Geostatistical Software Library and
User's Guide, 2nd ed., 369 pp., Oxford, New York, Oxford University Press,
ISBN: 0 19 510015 8, 1998.
Fischer, M., Huss, M., and Hoelzle, M.: Surface elevation and mass changes of
all Swiss glaciers 1980–2010, The Cryosphere, 9, 525–540,
https://doi.org/10.5194/tc-9-525-2015, 2015.
Gardelle, J., Berthier, E., and Arnaud, Y.: Slight mass gain of Karakoram
glaciers in the early twenty-first century, Nat. Geosci., 5, 322–325,
https://doi.org/10.1038/NGEO1450, 2012.
Guðmundsson, S., Björnsson, H., Pálsson, F. and Haraldsson, H.
H.: Comparison of energy and degree-day models of summer ablation on the
Langjökull ice cap, SW-Iceland, Jökull, 59, 1–18, 2009.
Guðmundsson, S., Björnsson, H., Magnússon, E., Berthier, E.,
Pálsson, F., Guðmundsson, M. T., Hognadóttir, T., and Dall, J.:
Response of Eyjafjallajokull, Torfajokull and Tindfjallajokull ice caps in
Iceland to regional warming, deduced by remote sensing, Polar Res. Online,
30, 7282, https://doi.org/10.3402/polar.v30i0.7282, 2011.
Hannesdóttir, H., Björnsson, H., Pálsson, F.,
Aðalgeirsdóttir, G., and Guðmundsson, Sv.: Changes in the
southeast Vatnajökull ice cap, Iceland, between ∼ 1890 and 2010,
The Cryosphere, 9, 565–585, https://doi.org/10.5194/tc-9-565-2015, 2015.
Howat, I. M., Porter, C., Noh, M. J., Smith, B. E., and Jeong, S.: Brief
Communication: Sudden drainage of a subglacial lake beneath the Greenland Ice
Sheet, The Cryosphere, 9, 103–108, https://doi.org/10.5194/tc-9-103-2015, 2015.
Höhle, J. and Höhle, M.: Accuracy assessment of digital elevation
models by means of robust statistical methods, ISPRS J. Photogramm. Remote
Sens., 64, 398–406, https://doi.org/10.1016/j.isprsjprs.2009.02.003, 2009.
Huss, M.: Density assumptions for converting geodetic glacier volume change
to mass change, The Cryosphere, 7, 877–887, https://doi.org/10.5194/tc-7-877-2013, 2013.
Jacobsen, K.: Vorschläge zur Konzeption und zur Bearbeitung von
Bündelblockausgleichungen, PhD thesis, No. 102, wissenschaftliche
Arbeiten der Fachrichtung Vermessungswesen der Universität Hannover,
Hannover, 1980.
James, T., Murray, T. Barrand, N. and Barr, S.: Extracting photogrammetric
ground control from lidar DEMs for change detection, The Photogrammetric
Record 21, 312–328, 2006.
James, T. D., Murray, T., Barrand, N. E., Sykes, H. J., Fox, A. J., and King,
M. A.: Observations of enhanced thinning in the upper reaches of Svalbard
glaciers, The Cryosphere, 6, 1369–1381, https://doi.org/10.5194/tc-6-1369-2012, 2012.
Jóhannesson, T., Aðalgeirsdóttir, G., Björnsson, H., Crochet,
P., Elíasson, E.B., Guðmundsson, S., Jónsdóttir, J.F.,
Ólafsson, H., Pálsson, F., Rögnvaldsson, Ó., Sigurðsson,
O., Snorrason, Á. Sveinsson, Ó. G. B., and Thorsteinsson, T.: Effect
of climate change on hydrology and hydro-resources in Iceland. Rep.
OS-2007/011. National Energy Authority, 91 pp. 2007.
Jóhannesson, T., Björnsson, H., Pálsson, F., Sigurðsson, O.,
and Þorsteinsson, Þ.: LiDAR mapping of the Snæfellsjökull
ice cap, western Iceland, Jökull, 61, 19–32, 2011.
Jóhannesson, T., Björnsson, H., Magnússon, E., Guðmundsson,
S., Pálsson, F., Sigurðsson, O., Thorsteinsson, T., and Berthier, E.:
Ice-volume changes, bias estimation of mass-balance measurements and changes
in subglacial lakes derived by lidar mapping of the surface Icelandic
glaciers, Ann. Glaciol., 54, 63–74, https://doi.org/10.3189/2013AoG63A422, 2013.
Kääb, A.: Remote Sensing of Mountain Glaciers and Permafrost Creep,
edited by: Haeberli, W. and Maisch, M., Geographisches Institut der
Universität Zürich, Zürich, 246 pp., 2005.
Kraus, K.: Photogrammetry; Vol. 1: Geometry from Images and Laser Scans,
Walter De Gruyter, Goettingen, Germany, 459 pp., 2007.
Krimmel, R. M.: Analysis of Difference Between Direct and Geodetic Mass
Balance Measurements at South Cascade Glacier, Washington, Geogr. Ann., 81,
653–658, 1999.
Kunz, M., Mills, J. P., Miller, P. E., King, M. A., Fox, A. J., and Marsh,
S.: Application of surface matching for improved measurements of historic
glacier volume change in the Antarctic Peninsula. Int. Arch. Photogramm.
Remote Sens. Spatial Inform. Sci., 39, 579–584, 2012.
Lee, S.-Y., Carle, S. F., and Fogg, G. E.: Geologic heterogeneity and a
comparison of two geostatistical models; sequential Gaussian and transition
probability-based geostatistical simulation, Adv. Water Resour., 30,
1914–1932, https://doi.org/10.1016/j.advwatres.2007.03.005, 2007.
Nuth, C. and Kääb, A.: Co-registration and bias corrections of
satellite elevation data sets for quantifying glacier thickness change, The
Cryosphere, 5, 271–290, https://doi.org/10.5194/tc-5-271-2011, 2011.
Nuth, C., Kohler, J., Aas, H. F., Brandt, O., and Hagen, J. O.: Glacier
geometry and elevation changes on Svalbard (1936–90); a baseline dataset,
Ann. Glaciol., 46, 106–116, https://doi.org/10.3189/172756407782871440, 2007.
Pálsson, F., Guðmundsson, S., Björnsson, H., Berthier, E.,
Magnússon, E., Guðmundsson, S., and Haraldsson, H.: Mass and volume
changes of Langjökull ice cap, Iceland, ∼ 1890 to 2009, deduced
from old maps, satellite images and in situ mass balance measurements,
Jökull, 62, 81–96, 2012.
Rolstad, C., Haug, T., and Denby, B.: Spatially integrated geodetic glacier
mass balance and its uncertainty based on geostatistical analysis;
application to the western Svartisen ice cap, Norway, J. Glaciol., 55,
666–680, 2009.
Rusu, R. B. and Cousins, S.: 3-D is here: point Cloud Library (PCL), in:
Proceedings of the IEEE International Conference on Robotics and Automation
(ICRA), May 2011, Shangai, China, 2011.
Soruco, A., Vincent, C., Francou, B., and Gonzalez, J. F.: Glacier decline
between 1963 and 2006 in the Cordillera Real, Bolivia, Geophys. Res. Lett.,
36, L03502, https://doi.org/10.1029/2008GL036238, 2009.
Spriggs, R. M.: The calibration of Military Cartographic Cameras, Technical
Note, Intelligence 15 and Mapping R. & D. Agency, Wright-Patterson Air
Force Base, Ohio, USA, 1966.
Thibert, E., Blanc, R., Vincent, C., and Eckert, N.: Instruments and methods;
glaciological and volumetric mass-balance measurements; error analysis over
51 years for Glacier de Sarennes, French Alps, J. Glaciol., 54, 522–532,
https://doi.org/10.3189/002214308785837093, 2008.
Trüssel, B. L., Motyka, R. J., Truffer, M., and Larsen, C. F.: Rapid
thinning of lake-calving Yakutat Glacier and the collapse of the Yakutat
Icefield, southeast Alaska, USA, J. Glaciol., 59, 149–161, 2013.
Uppala, S. M., Kallberg, P. W., Simmons, A. J., Andrae, U., Da Costa
Bechtold, V., Fiorino, M., Gibson, J. K., Haseler, J., Hernandez, A., Kelly,
G. A., Li, X., Onogi, K., Saarinen, S., Sokka, N., Allan, R. P., Andersson,
E., Arpe, K., Balmaseda, M. A., Beljaars, A. C. M., Van De Berg, L., Bidlot,
J., Bormann, N., Caires, S., Chevallier, F., Dethof, A., Dragosavac, M.,
Fuentes, M., Hagemann, S., Holm, E., Hoskins, B. J., Isaksen, L., Janssen, P.
A. E. M., Jenne, R., McNally, A. P., Mahfouf, J. F., Morcrette, J. J.,
Rayner, N. A., Saunders, R. W., Simon, P., Sterl, A., Trenberth, K. E.,
Untch, A., Vasiljevic, D., Viterbo, P., and Woollen, J.: The ERA-40
re-analysis, Q. J. R. Meteorol. Soc., 131, 2961–3012, 2005.
Vaughan, D. G., Comiso, J. C., Allison, I., Carrasco, J., Kaser, G., Kwok,
R., Mote, P., Murray, T., Paul, F., Ren, J., Rignot, E., Solomina, O.,
Steffen, K., and Zhang, T.: Observations: Cryosphere, in: Climate Change
2013: The Physical Science Basis. Contribution of Working Group I to the
Fifth Assessment Report of the Intergovernmental Panel on Climate Change,
edited by: Stocker, T. F., Qin, D., Plattner, G.-K., Tignor, M., Allen, S.
K., Boschung, J., Nauels, A., Xia, Y., Bex, V., and Midgley, P. M., Cambridge
University Press, Cambridge, UK and New York, NY, USA, 317–382, 2013.
Wolf, P. and Dewitt, B. A.: Elements of Photogrammetry; with Applications in
GIS, McCraw Hill, Boston, MA, USA, 2000.
Zemp, M., Thibert, E., Huss, M., Stumm, D., Rolstad Denby, C., Nuth, C.,
Nussbaumer, S. U., Moholdt, G., Mercer, A., Mayer, C., Joerg, P. C., Jansson,
P., Hynek, B., Fischer, A., Escher-Vetter, H., Elvehøy, H., and Andreassen,
L. M.: Reanalysing glacier mass balance measurement series, The Cryosphere,
7, 1227–1245, https://doi.org/10.5194/tc-7-1227-2013, 2013.
Short summary
We demonstrate the opportunities given by high resolution digital elevation models (DEMs) to improve procedures for obtaining mass balance records from archives of aerial photographs. We also describe a geostatistical approach to estimate uncertainty of elevation changes derived by differencing DEMs. This method is more statistically robust than other described in the literature. Our study highlights a common tendency of overestimating this uncertainty, downgrading geodetic mass balance records.
We demonstrate the opportunities given by high resolution digital elevation models (DEMs) to...
