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187 results on '"Andreassen, Liss M."'

1. Reconstructing the Holocene glacial history of northern Troms and western Finnmark, Arctic Norway.

Author

Leigh, Josh R., Jones, Richard S., Stokes, Chris R., Evans, David J. A., Carr, J. Rachel, and Andreassen, Liss M.

Subjects
ICE sheet thawing, COSMOGENIC nuclides, ALPINE glaciers, GLACIAL erosion, ICE sheets, LITTLE Ice Age
Abstract

Here we present the first Lateglacial and Holocene glacial history from Rotsunddalen, northern Troms and western Finnmark county, northern Norway, based on both relative and numerical moraine dating using Schmidt hammer, soil chronosequencing and terrestrial cosmogenic nuclide dating. We combine these chronological data with a regional map of the glacial geomorphology to hypothesize key events in the glacial history from around 14 ka to present. Our reconstruction shows that, following deglaciation of the main ice sheet across central Troms and Finnmark, mountain glaciers were terminating on land, close to the coast, between around 12.1 and 10.6 ka. Continued recession of the main Fennoscandian Ice Sheet margin towards the SE led to the isolation of several large plateau icefields and outlet glaciers that generated moraines at around 10.2–9.2 ka, which we ascribe to the Erdalen Event, and 8.4–8.2 ka, which is broadly contemporaneous with the 8.2 ka cold event. Although the latter corresponds with the Scandinavian Finse Event, very few moraines have been dated to this time and we therefore view it as a tentative hypothesis for future work to test. During the Holocene Thermal Maximum (~6.6 to 6.3 ka) most (if not all) glaciers in the region disappeared, but then regrew during the Neoglaciation and produced large moraines dated to around 4.7 ka that lie a few hundred metres distal to the prominent Little Ice Age moraines (previously dated to AD 1810s–1870s). Given the limitations of our dating approach, the preservation of moraines dated to this period in northern Norway also warrants further investigation. We also highlight that terrestrial cosmogenic nuclide dating of the moraines is not consistent with other dating approaches and the widely established deglaciation history of the region, probably owing to cosmogenic inheritance and insufficient glacial erosion. [ABSTRACT FROM AUTHOR]

Published
2024
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2. How accurate are estimates of glacier ice thickness? Results from ITMIX, the Ice Thickness Models Intercomparison eXperiment

Author

Farinotti, Daniel, Brinkerhoff, Douglas J, Clarke, Garry KC, Fürst, Johannes J, Frey, Holger, Gantayat, Prateek, Gillet-Chaulet, Fabien, Girard, Claire, Huss, Matthias, Leclercq, Paul W, Linsbauer, Andreas, Machguth, Horst, Martin, Carlos, Maussion, Fabien, Morlighem, Mathieu, Mosbeux, Cyrille, Pandit, Ankur, Portmann, Andrea, Rabatel, Antoine, Ramsankaran, RAAJ, Reerink, Thomas J, Sanchez, Olivier, Stentoft, Peter A, Kumari, Sangita Singh, van Pelt, Ward JJ, Anderson, Brian, Benham, Toby, Binder, Daniel, Dowdeswell, Julian A, Fischer, Andrea, Helfricht, Kay, Kutuzov, Stanislav, Lavrentiev, Ivan, McNabb, Robert, Gudmundsson, G Hilmar, Li, Huilin, and Andreassen, Liss M

Subjects
Earth Sciences, Physical Geography and Environmental Geoscience, Oceanography, Meteorology & Atmospheric Sciences, Physical geography and environmental geoscience
Abstract

Knowledge of the ice thickness distribution of glaciers and ice caps is an important prerequisite for many glaciological and hydrological investigations. A wealth of approaches has recently been presented for inferring ice thickness from characteristics of the surface. With the Ice Thickness Models Intercomparison eXperiment (ITMIX) we performed the first coordinated assessment quantifying individual model performance. A set of 17 different models showed that individual ice thickness estimates can differ considerably - locally by a spread comparable to the observed thickness. Averaging the results of multiple models, however, significantly improved the results: on average over the 21 considered test cases, comparison against direct ice thickness measurements revealed deviations on the order of 10 ± 24% of the mean ice thickness (1σ estimate). Models relying on multiple data sets - such as surface ice velocity fields, surface mass balance, or rates of ice thickness change - showed high sensitivity to input data quality. Together with the requirement of being able to handle large regions in an automated fashion, the capacity of better accounting for uncertainties in the input data will be a key for an improved next generation of ice thickness estimation approaches.

Published
2017

3. Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data.

Author

Piermattei, Livia, Zemp, Michael, Sommer, Christian, Brun, Fanny, Braun, Matthias H., Andreassen, Liss M., Belart, Joaquín M. C., Berthier, Etienne, Bhattacharya, Atanu, Boehm Vock, Laura, Bolch, Tobias, Dehecq, Amaury, Dussaillant, Inés, Falaschi, Daniel, Florentine, Caitlyn, Floricioiu, Dana, Ginzler, Christian, Guillet, Gregoire, Hugonnet, Romain, and Huss, Matthias

Subjects
OPTICAL radar, RADAR interferometry, ASTER (Advanced spaceborne thermal emission & reflection radiometer), DIGITAL elevation models, OPTICAL sensors, SPACE-based radar, GLACIERS, SYNTHETIC aperture radar
Abstract

Observations of glacier mass changes are key to understanding the response of glaciers to climate change and related impacts, such as regional runoff, ecosystem changes, and global sea level rise. Spaceborne optical and radar sensors make it possible to quantify glacier elevation changes, and thus multi-annual mass changes, on a regional and global scale. However, estimates from a growing number of studies show a wide range of results with differences often beyond uncertainty bounds. Here, we present the outcome of a community-based inter-comparison experiment using spaceborne optical stereo (ASTER) and synthetic aperture radar interferometry (TanDEM-X) data to estimate elevation changes for defined glaciers and target periods that pose different assessment challenges. Using provided or self-processed digital elevation models (DEMs) for five test sites, 12 research groups provided a total of 97 spaceborne elevation-change datasets using various processing approaches. Validation with airborne data showed that using an ensemble estimate is promising to reduce random errors from different instruments and processing methods but still requires a more comprehensive investigation and correction of systematic errors. We found that scene selection, DEM processing, and co-registration have the biggest impact on the results. Other processing steps, such as treating spatial data voids, differences in survey periods, or radar penetration, can still be important for individual cases. Future research should focus on testing different implementations of individual processing steps (e.g. co-registration) and addressing issues related to temporal corrections, radar penetration, glacier area changes, and density conversion. Finally, there is a clear need for our community to develop best practices, use open, reproducible software, and assess overall uncertainty to enhance inter-comparison and empower physical process insights across glacier elevation-change studies. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Glacier thinning, recession and advance, and the associated evolution of a glacial lake between 1966 and 2021 at Austerdalsbreen, western Norway

Author

Seier, Gernot, primary, Abermann, Jakob, additional, Andreassen, Liss M., additional, Carrivick, Jonathan L., additional, Kielland, Pål H., additional, Löffler, Karina, additional, Nesje, Atle, additional, Robson, Benjamin A., additional, Røthe, Torgeir O., additional, Scheiber, Thomas, additional, Winkler, Stefan, additional, and Yde, Jacob C., additional

Published
2023
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7. The Pléiades Glacier Observatory: high resolution digital elevation models and ortho-imagery to monitor glacier change.

Author

Berthier, Etienne, Lebreton, Jérôme, Fontannaz, Delphine, Hosford, Steven, Belart, Joaquin M. C., Brun, Fanny, Andreassen, Liss M., Menounos, Brian, and Blondel, Charlotte

Abstract

Spaceborne digital elevation models (DEMs) of glaciers are essential to describe their health, and their contribution to river runoff and to sea level rise. Publicly available DEMs derived from submeter satellite stereo-imagery were, up to now, mainly available in the polar regions and High Mountain Asia. Here, we present the Pléiades Glacier Observatory (PGO), a scientific programme acquiring Pléiades stereo pairs for 140 sites from Earth's glacierized areas. The PGO product consists of DEMs at 2 m and 20 m ground sampling distance together with 0.5 m (panchromatic) and 2 m (multispectral) ortho-images. The DEMs are freely available to all registered users whereas ortho-images are available after signing a licence. PGO commenced in July 2016 in the North Hemisphere and February 2017 in the South Hemisphere. Each site is revisited every five years (cloud permitting), close to the end of the melt season, to measure glacier elevation change with an average uncertainty of 0.49 m (95% confidence level, for a glacierized area of 1 km²), i.e. 0.1 m α-1. PGO samples over 20,000 km² of glacierized terrain which represents about 3% of the Earth's glaciers area. This small sample, however, provides a first order estimate of the global glacier mass change and its decadal evolution. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Glacier thinning, recession and advance, and the associated evolution of a glacial lake between 1966 and 2021 at Austerdalsbreen, western Norway.

Author

Seier, Gernot, Abermann, Jakob, Andreassen, Liss M., Carrivick, Jonathan L., Kielland, Pål H., Löffler, Karina, Nesje, Atle, Robson, Benjamin A., Røthe, Torgeir O., Scheiber, Thomas, Winkler, Stefan, and Yde, Jacob C.

Subjects
GLACIAL lakes, GLACIERS, REMOTE-sensing images, ICE caps, MORAINES
Abstract

The Jostedalsbreen is the largest ice cap in Norway and mainland Europe. Rapid retreat of many of its outlet glaciers since the 2000s has led to the formation of several glacial lakes. Processes causing the formation and expansion of glacial lakes and their interaction with a glacier and terminal moraine have not been widely addressed yet. In this study, we investigate the degradation of the front of the southeast‐facing outlet glacier Austerdalsbreen. Based on a variety of remotely sensed data (UAV‐based and airborne orthophotos and DEMs, satellite images), we analyze the coincident glacial and proglacial changes of Austerdalsbreen and quantify the evolution of this transition zone during the last decades. In particular, we focus on the short‐term evolution of the glacial lake since 2010, we examine the context of a glacier advance in the 1990s, and we report long‐term changes by utilizing 1960s imagery. We discuss the evolution and conditions of Austerdalsbreen compared to other outlet glaciers of Jostedalsbreen. Overall, the glacier terminus has experienced a recession in the last decades. The 1990s terminus advance was more restricted than at other nearby outlet glaciers due to glacier surface debris cover, which is a critical factor for the glacier and lake evolution. However, in the most recent period, since 2012, a distinct expansion of a glacial lake is quantifiable. Since the rates of glacier surface lowering also considerably increased since approximately 2017 and the glacier retreated since the beginning of the 2000s with a clear maximum length decrease in 2015, we interpret the recently formed glacial lake as a contributory factor of glacial changes. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Will Juvfonne disappear or prevail? Atmospheric influences on snow accumulation and ablation on an ice patch in southern Norway

Author

Monrad-Krohn, Lukas, Andreassen, Liss M., Isaksen, Ketil, and Ødegård, Rune S.

Abstract

Juvfonne is a small ice patch in the Norwegian mountain region Jotunheimen. Since 2010 annual investigations of mass balance with point measurements of snow accumulation and ablation have been carried out together with surface elevation and ice patch extent measurements. Overall, Jotunheimen glaciers have lost around 15% of area and significant amounts of mass since the 1960s, with accelerated thinning since 2000. However, Juvfonne is prevailing, despite years with highly negative mass balances and a greater variability than the other glaciers. Here we use data from two nearby automatic weather stations and a sonic snow depth sensor next to Juvfonne. In winter season, deposition of windblown snow on Juvfonne is estimated to cause three to four times more snow accumulation than in the surroundings. The snow accumulation is dependent on wind direction and speed. Major snowfall events are associated with storms or synoptic cold fronts. Ablation is related to cumulative positive degree days, but short periods of high melt are characterised by advection of warm and humid air masses., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)

Published
2023

11. Norway

Author

Andreassen, Liss M., Paul, Frank, Hausberg, Jon Endre, Kargel, Jeffrey S., editor, Leonard, Gregory J., editor, Bishop, Michael P., editor, Kääb, Andreas, editor, and Raup, Bruce H., editor

Published
2014
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12. Observing glacier elevation changes from spaceborne optical and radar sensors – an inter-comparison experiment using ASTER and TanDEM-X data.

Author

Piermattei, Livia, Zemp, Michael, Sommer, Christian, Brun, Fanny, Braun, Matthias H., Andreassen, Liss M., Belart, Joaquín M. C., Berthier, Etienne, Bhattacharya, Atanu, Vock, Laura Boehm, Bolch, Tobias, Dehecq, Amaury, Dussaillant, Inés, Falaschi, Daniel, Florentine, Caitlyn, Floricioiu, Dana, Ginzler, Christian, Guillet, Gregoire, Hugonnet, Romain, and Huss, Matthias

Subjects
SPACE-based radar, OPTICAL radar, SYNTHETIC aperture radar, OPTICAL sensors, GLACIERS, RADAR interferometry, ABSOLUTE sea level change
Abstract

Observations of glacier mass changes are key to understanding the response of glaciers to climate change and related impacts, such as regional runoff, ecosystem changes, and global sea-level rise. Spaceborne optical and radar sensors make it possible to quantify glacier elevation changes, and thus multi-annual mass changes, on a regional and global scale. However, estimates from a growing number of studies show a wide range of results with differences often beyond uncertainty bounds. Here, we present the outcome of a community-based inter-comparison experiment using spaceborne optical stereo (ASTER) and synthetic aperture radar interferometry (TanDEM-X) data to estimate elevation changes for defined glaciers and target periods that pose different assessment challenges. Using provided or self-processed digital elevation models (DEMs) for five test sites, 12 research groups provided a total of 97 spaceborne elevation-change datasets using various processing strategies. Validation with airborne data showed that using an ensemble estimate is promising to reduce random errors from different instruments and processing methods, but still requires a more comprehensive investigation and correction of systematic errors. We found that scene selection, DEM processing, and co-registration have the biggest impact on the results. Other processing steps, such as treating spatial data voids, differences in survey periods, or radar penetration, can still be important for individual cases. Future research should focus on testing different implementations of individual processing steps (e.g. co-registration) and addressing issues related to temporal corrections, radar penetration, glacier area changes, and density conversion. Finally, there is a clear need for our community to develop best practices, use open, reproducible software, and assess overall uncertainty in order to enhance inter-comparison and empower physical process insights across glacier elevation-change studies. [ABSTRACT FROM AUTHOR]

Published
2023
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14. Cloud forcing of surface energy balance from in situ measurements in diverse mountain glacier environments

Author

Conway, Jonathan P., primary, Abermann, Jakob, additional, Andreassen, Liss M., additional, Azam, Mohd Farooq, additional, Cullen, Nicolas J., additional, Fitzpatrick, Noel, additional, Giesen, Rianne H., additional, Langley, Kirsty, additional, MacDonell, Shelley, additional, Mölg, Thomas, additional, Radić, Valentina, additional, Reijmer, Carleen H., additional, and Sicart, Jean-Emmanuel, additional

Published
2022
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15. Cloud forcing of surface energy balance from in situ measurements in diverse mountain glacier environments

Author

Conway, Jonathan P., Abermann, Jakob, Andreassen, Liss M., Azam, Mohd Farooq, Cullen, Nicolas J., Fitzpatrick, Noel, Giesen, Rianne H., Langley, Kirsty, MacDonell, Shelley, Mölg, Thomas, Radić, Valentina, Reijmer, Carleen H., Sicart, Jean Emmanuel, Conway, Jonathan P., Abermann, Jakob, Andreassen, Liss M., Azam, Mohd Farooq, Cullen, Nicolas J., Fitzpatrick, Noel, Giesen, Rianne H., Langley, Kirsty, MacDonell, Shelley, Mölg, Thomas, Radić, Valentina, Reijmer, Carleen H., and Sicart, Jean Emmanuel

Abstract

Clouds are an important component of the climate system, yet our understanding of how they directly and indirectly affect glacier melt in different climates is incomplete. Here we analyse high-quality datasets from 16 mountain glaciers in diverse climates around the globe to better understand how relationships between clouds and near-surface meteorology, radiation and surface energy balance vary. The seasonal cycle of cloud frequency varies markedly between mountain glacier sites. During the main melt season at each site, an increase in cloud cover is associated with increased vapour pressure and relative humidity, but relationships to wind speed are site specific. At colder sites (average near-surface air temperature in the melt season <0gg C), air temperature generally increases with increasing cloudiness, while for warmer sites (average near-surface air temperature in the melt season ≫0gg C), air temperature decreases with increasing cloudiness. At all sites, surface melt is more frequent in cloudy compared to clear-sky conditions. The proportion of melt from temperature-dependent energy fluxes (incoming longwave radiation, turbulent sensible heat and latent heat) also universally increases in cloudy conditions. However, cloud cover does not affect daily total melt in a universal way, with some sites showing increased melt energy during cloudy conditions and others decreased melt energy. The complex association of clouds with melt energy is not amenable to simple relationships due to many interacting physical processes (direct radiative forcing; surface albedo; and co-variance with temperature, humidity and wind) but is most closely related to the effect of clouds on net radiation. These results motivate the use of physics-based surface energy balance models for representing glacier-climate relationships in regional- and global-scale assessments of glacier response to climate change.

Published
2022

16. Cloud forcing of surface energy balance from in situ measurements in diverse mountain glacier environments

Author

Sub Dynamics Meteorology, Marine and Atmospheric Research, Conway, Jonathan P., Abermann, Jakob, Andreassen, Liss M., Azam, Mohd Farooq, Cullen, Nicolas J., Fitzpatrick, Noel, Giesen, Rianne H., Langley, Kirsty, MacDonell, Shelley, Mölg, Thomas, Radić, Valentina, Reijmer, Carleen H., Sicart, Jean Emmanuel, Sub Dynamics Meteorology, Marine and Atmospheric Research, Conway, Jonathan P., Abermann, Jakob, Andreassen, Liss M., Azam, Mohd Farooq, Cullen, Nicolas J., Fitzpatrick, Noel, Giesen, Rianne H., Langley, Kirsty, MacDonell, Shelley, Mölg, Thomas, Radić, Valentina, Reijmer, Carleen H., and Sicart, Jean Emmanuel

Published
2022

18. CryoClim glacier product documentation : CryoClim glacier sub-service by NVE

Author

Andreassen, Liss M. and Winsvold, Solveig H.

Subjects
Sentinel-2, Glaciers, Landsat, Copernicus
Abstract

The CryoClim service provides cryospheric climate products, primarily based on satellite observations. Glacier products from mainland Norway in the CryoClim service consist of Glacier Area Outline (GAO), Glacierdammed Lake Outlines (GLO), Climate Indicator (CI) products, Glacier Lake Outburst floods (GLOF) and Glacier Periodic Photo series (GPP) products. This report describes these products

Published
2022

22. Glaciological investigations in Norway 2020

Author

Kjøllmoen, Bjarne, Andreassen, Liss M., Elvehøy, Hallgeir, Melvold, Kjetil, and Kjøllmoen, Bjarne

Subjects
Glacier length change, Ice velocity, Meteorology, Glaciology, Mass balance, Jøkulhlaup, Glacier dynamics
Abstract

Results of glaciological investigations performed at Norwegian glaciers in 2020 are presented in this report. The main part concerns mass balance investigations. Results from investigations of glacier length changes are discussed in a separate chapter.

Published
2021

23. Results from the Ice Thickness Models Intercomparison eXperiment Phase 2 (ITMIX2)

Author

Farinotti, Daniel, Brinkerhoff, Douglas J., Fürst, Johannes J., Gantayat, Prateek, Gillet-Chaulet, Fabien, Huss, Matthias, Leclercq, Paul W., Maurer, Hansruedi, Morlighem, Mathieu, Pandit, Ankur, Rabatel, Antoine, Ramsankaran, RAAJ, Reerink, Thomas J., Robo, Ellen, Rouges, Emmanuel, Tamre, Erik, van Pelt, Ward J. J., Werder, Mauro A., Azam, Mohod Farooq, Li, Huilin, and Andreassen, Liss M.

Subjects
Physical Geography, Naturgeografi, ddc:550, General Earth and Planetary Sciences, glaciers, ice caps, ice thickness, modeling, intercomparison
Abstract

Frontiers in Earth Science, 8, ISSN:2296-6463

Published
2021

24. Worldwide version-controlled database of glacier thickness observations

Author

Welty, Ethan, Zemp, Michael, Navarro, Francisco, Huss, Matthias, Fürst, Johannes J., Gärtner-Roer, Isabelle, Landmann, Johannes, Machguth, Horst, Naegeli, Kathrin, Andreassen, Liss M., Farinotti, Daniel, Li, Huilin, GlaThiDa Contributors, Welty, Ethan, Zemp, Michael, Navarro, Francisco, Huss, Matthias, Fürst, Johannes J., Gärtner-Roer, Isabelle, Landmann, Johannes, Machguth, Horst, Naegeli, Kathrin, Andreassen, Liss M., Farinotti, Daniel, Li, Huilin, and GlaThiDa Contributors

Abstract

Although worldwide inventories of glacier area have been coordinated internationally for several decades, a similar effort for glacier ice thicknesses was only initiated in 2013. Here, we present the third version of the Glacier Thickness Database (GlaThiDa v3), which includes 3 854 279 thickness measurements distributed over roughly 3000 glaciers worldwide. Overall, 14 % of global glacier area is now within 1 km of a thickness measurement (located on the same glacier) – a significant improvement over GlaThiDa v2, which covered only 6 % of global glacier area and only 1100 glaciers. Improvements in measurement coverage increase the robustness of numerical interpolations and model extrapolations, resulting in better estimates of regional to global glacier volumes and their potential contributions to sea-level rise.In this paper, we summarize the sources and compilation of glacier thickness data and the spatial and temporal coverage of the resulting database. In addition, we detail our use of open-source metadata formats and software tools to describe the data, validate the data format and content against this metadata description, and track changes to the data following modern data management best practices. Archived versions of GlaThiDa are available from the World Glacier Monitoring Service (e.g., v3.1.0, from which this paper was generated: https://doi.org/10.5904/wgms-glathida-2020-10; GlaThiDa Consortium, 2020), while the development version is available on GitLab (https://gitlab.com/wgms/glathida, last access: 9 November 2020).

Published
2021

25. Worldwide version-controlled database of glacier thickness observations

Author

Welty, Ethan, Zemp, Michael, Navarro, Francisco, Huss, Matthias, Fürst, Johannes J, Gärtner-Roer, Isabelle, Landmann, Johannes, Machguth, Horst, Naegeli, Kathrin, Andreassen, Liss M, Farinotti, Daniel, Li, Huilin, University of Zurich, and Welty, Ethan

Subjects
10122 Institute of Geography, 1900 General Earth and Planetary Sciences, 910 Geography & travel
Published
2020
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26. State of the climate in 2019 the arctic: The Arctic

Author

Richter-Menge, Jacqueline, Druckenmiller, Matthew L., Andersen, J. K., Andreassen, Liss M., Baker, Emily H., Ballinger, Thomas J., Berner, Logan T., Bernhard, Germar H., and Wouters, B.

Published
2020

27. Glaciological investigations in Norway 2019

Author

Kjøllmoen, Bjarne, Andreassen, Liss M., Elvehøy, Hallgeir, Jackson, Miriam, and Kjøllmoen, Bjarne

Subjects
Glacier length change, Ice velocity, Meteorology, Glaciology, Subglacial laboratory, Mass balance, Jøkulhlaup, Glacier dynamics
Abstract

Results of glaciological investigations performed at Norwegian glaciers in 2019 are presented in this report. The main part concerns mass balance investigations. Results from investigations of glacier length changes are discussed in a separate chapter.

Published
2020

28. The Arctic

Author

Andersen, J K, Andreassen, Liss M, Baker, Emily H, Ballinger, Thomas J, Berner, Logan T, Bernhard, Germar H, Bhatt, Uma S, Bjerke, Jarle W, Box, Jason E, Britt, L, Brown, R, Burgess, David, Cappelen, John, Christiansen, Hanne H, Decharme, B, Derksen, C, Drozdov, D S, Epstein, Howard E, Farquharson, L M, Farrell, Sinead L, Fausto, Robert S, Fettweis, Xavier, Fioletov, Vitali E, Forbes, Bruce C, Frost, Gerald V, Gerland, Sebastian, Goetz, Scott J, Grooß, Jens-Uwe, Hanna, Edward, Hanssen-Bauer, Inger, Hendricks, Stefan, Ialongo, Iolanda, Isaksen, K, Johnsen, Bjørn, Kaleschke, L, Kholodov, A L, Kim, Seong-Joong, Kohler, Jack, Labe, Zachary, Ladd, Carol, Lakkala, Kaisa, Lara, Mark J, Loomis Bryant andLuks, Bartlomiej, Luojus, K, Macander, Matthew J, Malkova, G V, Mankoff, Kenneth D, Manney, Gloria L, Marsh, J M, Meier, Walt, Moon, Twila A, Mote, Thomas, Mudryk, L, Mueter, F J, Müller, Rolf, Nyland, K E, O'Neel, Shad, Overland, James E, Perovich, Don, Phoenix, Gareth K, Raynolds, Martha K, Reijmer, C H, Ricker, Robert, Romanovsky, Vladimir E, Schuur, E A G, Sharp, Martin, Shiklomanov, Nikolai I, Smeets, C J P P, Smith, Sharon L, Streletskiy, Dimitri A, Tedesco, Marco, Thoman, Richard L, Thorson, J T, Tian-Kunze, X, Timmermans, Mary-Louise, Tømmervik, Hans, Tschudi, Mark, van As, Dirk, van de Wal, R S W, Walker, Donald A, Walsh, John E, Wang, Muyin, Webster, Melinda, Winton, Øyvind, Wolken, Gabriel J, Wood, K, Wouters, Bert, Zador, S, Richter-Menge, Jacqueline, Druckenmiller, Matthew L, Andersen, J K, Andreassen, Liss M, Baker, Emily H, Ballinger, Thomas J, Berner, Logan T, Bernhard, Germar H, Bhatt, Uma S, Bjerke, Jarle W, Box, Jason E, Britt, L, Brown, R, Burgess, David, Cappelen, John, Christiansen, Hanne H, Decharme, B, Derksen, C, Drozdov, D S, Epstein, Howard E, Farquharson, L M, Farrell, Sinead L, Fausto, Robert S, Fettweis, Xavier, Fioletov, Vitali E, Forbes, Bruce C, Frost, Gerald V, Gerland, Sebastian, Goetz, Scott J, Grooß, Jens-Uwe, Hanna, Edward, Hanssen-Bauer, Inger, Hendricks, Stefan, Ialongo, Iolanda, Isaksen, K, Johnsen, Bjørn, Kaleschke, L, Kholodov, A L, Kim, Seong-Joong, Kohler, Jack, Labe, Zachary, Ladd, Carol, Lakkala, Kaisa, Lara, Mark J, Loomis Bryant andLuks, Bartlomiej, Luojus, K, Macander, Matthew J, Malkova, G V, Mankoff, Kenneth D, Manney, Gloria L, Marsh, J M, Meier, Walt, Moon, Twila A, Mote, Thomas, Mudryk, L, Mueter, F J, Müller, Rolf, Nyland, K E, O'Neel, Shad, Overland, James E, Perovich, Don, Phoenix, Gareth K, Raynolds, Martha K, Reijmer, C H, Ricker, Robert, Romanovsky, Vladimir E, Schuur, E A G, Sharp, Martin, Shiklomanov, Nikolai I, Smeets, C J P P, Smith, Sharon L, Streletskiy, Dimitri A, Tedesco, Marco, Thoman, Richard L, Thorson, J T, Tian-Kunze, X, Timmermans, Mary-Louise, Tømmervik, Hans, Tschudi, Mark, van As, Dirk, van de Wal, R S W, Walker, Donald A, Walsh, John E, Wang, Muyin, Webster, Melinda, Winton, Øyvind, Wolken, Gabriel J, Wood, K, Wouters, Bert, Zador, S, Richter-Menge, Jacqueline, and Druckenmiller, Matthew L

Published
2020

29. The Arctic

Author

Dep Natuurkunde, Sub Dynamics Meteorology, Proceskunde, Sub Algemeen Marine & Atmospheric Res, Marine and Atmospheric Research, Andersen, J K, Andreassen, Liss M, Baker, Emily H, Ballinger, Thomas J, Berner, Logan T, Bernhard, Germar H, Bhatt, Uma S, Bjerke, Jarle W, Box, Jason E, Britt, L, Brown, R, Burgess, David, Cappelen, John, Christiansen, Hanne H, Decharme, B, Derksen, C, Drozdov, D S, Epstein, Howard E, Farquharson, L M, Farrell, Sinead L, Fausto, Robert S, Fettweis, Xavier, Fioletov, Vitali E, Forbes, Bruce C, Frost, Gerald V, Gerland, Sebastian, Goetz, Scott J, Grooß, Jens-Uwe, Hanna, Edward, Hanssen-Bauer, Inger, Hendricks, Stefan, Ialongo, Iolanda, Isaksen, K, Johnsen, Bjørn, Kaleschke, L, Kholodov, A L, Kim, Seong-Joong, Kohler, Jack, Labe, Zachary, Ladd, Carol, Lakkala, Kaisa, Lara, Mark J, Loomis Bryant andLuks, Bartlomiej, Luojus, K, Macander, Matthew J, Malkova, G V, Mankoff, Kenneth D, Manney, Gloria L, Marsh, J M, Meier, Walt, Moon, Twila A, Mote, Thomas, Mudryk, L, Mueter, F J, Müller, Rolf, Nyland, K E, O'Neel, Shad, Overland, James E, Perovich, Don, Phoenix, Gareth K, Raynolds, Martha K, Reijmer, C H, Ricker, Robert, Romanovsky, Vladimir E, Schuur, E A G, Sharp, Martin, Shiklomanov, Nikolai I, Smeets, C J P P, Smith, Sharon L, Streletskiy, Dimitri A, Tedesco, Marco, Thoman, Richard L, Thorson, J T, Tian-Kunze, X, Timmermans, Mary-Louise, Tømmervik, Hans, Tschudi, Mark, van As, Dirk, van de Wal, R S W, Walker, Donald A, Walsh, John E, Wang, Muyin, Webster, Melinda, Winton, Øyvind, Wolken, Gabriel J, Wood, K, Wouters, Bert, Zador, S, Richter-Menge, Jacqueline, Druckenmiller, Matthew L, Dep Natuurkunde, Sub Dynamics Meteorology, Proceskunde, Sub Algemeen Marine & Atmospheric Res, Marine and Atmospheric Research, Andersen, J K, Andreassen, Liss M, Baker, Emily H, Ballinger, Thomas J, Berner, Logan T, Bernhard, Germar H, Bhatt, Uma S, Bjerke, Jarle W, Box, Jason E, Britt, L, Brown, R, Burgess, David, Cappelen, John, Christiansen, Hanne H, Decharme, B, Derksen, C, Drozdov, D S, Epstein, Howard E, Farquharson, L M, Farrell, Sinead L, Fausto, Robert S, Fettweis, Xavier, Fioletov, Vitali E, Forbes, Bruce C, Frost, Gerald V, Gerland, Sebastian, Goetz, Scott J, Grooß, Jens-Uwe, Hanna, Edward, Hanssen-Bauer, Inger, Hendricks, Stefan, Ialongo, Iolanda, Isaksen, K, Johnsen, Bjørn, Kaleschke, L, Kholodov, A L, Kim, Seong-Joong, Kohler, Jack, Labe, Zachary, Ladd, Carol, Lakkala, Kaisa, Lara, Mark J, Loomis Bryant andLuks, Bartlomiej, Luojus, K, Macander, Matthew J, Malkova, G V, Mankoff, Kenneth D, Manney, Gloria L, Marsh, J M, Meier, Walt, Moon, Twila A, Mote, Thomas, Mudryk, L, Mueter, F J, Müller, Rolf, Nyland, K E, O'Neel, Shad, Overland, James E, Perovich, Don, Phoenix, Gareth K, Raynolds, Martha K, Reijmer, C H, Ricker, Robert, Romanovsky, Vladimir E, Schuur, E A G, Sharp, Martin, Shiklomanov, Nikolai I, Smeets, C J P P, Smith, Sharon L, Streletskiy, Dimitri A, Tedesco, Marco, Thoman, Richard L, Thorson, J T, Tian-Kunze, X, Timmermans, Mary-Louise, Tømmervik, Hans, Tschudi, Mark, van As, Dirk, van de Wal, R S W, Walker, Donald A, Walsh, John E, Wang, Muyin, Webster, Melinda, Winton, Øyvind, Wolken, Gabriel J, Wood, K, Wouters, Bert, Zador, S, Richter-Menge, Jacqueline, and Druckenmiller, Matthew L

Published
2020

30. State of the climate in 2019 the arctic: The Arctic

Author

Richter-Menge, Jacqueline (author), Druckenmiller, Matthew L. (author), Andersen, J. K. (author), Andreassen, Liss M. (author), Baker, Emily H. (author), Ballinger, Thomas J. (author), Berner, Logan T. (author), Bernhard, Germar H. (author), Wouters, B. (author), Richter-Menge, Jacqueline (author), Druckenmiller, Matthew L. (author), Andersen, J. K. (author), Andreassen, Liss M. (author), Baker, Emily H. (author), Ballinger, Thomas J. (author), Berner, Logan T. (author), Bernhard, Germar H. (author), and Wouters, B. (author)

Abstract

Physical and Space Geodesy

Published
2020
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31. Worldwide version-controlled database of glacier thickness observations

Author

Welty, Ethan; https://orcid.org/0000-0001-8046-2210, Zemp, Michael; https://orcid.org/0000-0003-2391-7877, Navarro, Francisco; https://orcid.org/0000-0002-5147-0067, Huss, Matthias, Fürst, Johannes J, Gärtner-Roer, Isabelle, Landmann, Johannes; https://orcid.org/0000-0003-0514-3521, Machguth, Horst; https://orcid.org/0000-0001-5924-0998, Naegeli, Kathrin; https://orcid.org/0000-0003-2443-7154, Andreassen, Liss M, Farinotti, Daniel; https://orcid.org/0000-0003-3417-4570, Li, Huilin, Welty, Ethan; https://orcid.org/0000-0001-8046-2210, Zemp, Michael; https://orcid.org/0000-0003-2391-7877, Navarro, Francisco; https://orcid.org/0000-0002-5147-0067, Huss, Matthias, Fürst, Johannes J, Gärtner-Roer, Isabelle, Landmann, Johannes; https://orcid.org/0000-0003-0514-3521, Machguth, Horst; https://orcid.org/0000-0001-5924-0998, Naegeli, Kathrin; https://orcid.org/0000-0003-2443-7154, Andreassen, Liss M, Farinotti, Daniel; https://orcid.org/0000-0003-3417-4570, and Li, Huilin

Abstract

Although worldwide inventories of glacier area have been coordinated internationally for several decades, a similar effort for glacier ice thicknesses was only initiated in 2013. Here, we present the third version of the Glacier Thickness Database (GlaThiDa v3), which includes 3 854 279 thickness measurements distributed over roughly 3000 glaciers worldwide. Overall, 14 % of global glacier area is now within 1 km of a thickness measurement (located on the same glacier) – a significant improvement over GlaThiDa v2, which covered only 6 % of global glacier area and only 1100 glaciers. Improvements in measurement coverage increase the robustness of numerical interpolations and model extrapolations, resulting in better estimates of regional to global glacier volumes and their potential contributions to sea-level rise. In this paper, we summarize the sources and compilation of glacier thickness data and the spatial and temporal coverage of the resulting database. In addition, we detail our use of open-source metadata formats and software tools to describe the data, validate the data format and content against this metadata description, and track changes to the data following modern data management best practices. Archived versions of GlaThiDa are available from the World Glacier Monitoring Service (e.g., v3.1.0, from which this paper was generated: https://doi.org/10.5904/wgms-glathida-2020-10; GlaThiDa Consortium, 2020), while the development version is available on GitLab (https://gitlab.com/wgms/glathida, last access: 9 November 2020).

Published
2020

34. The Arctic

Author

Andersen, J. K., additional, Andreassen, Liss M., additional, Baker, Emily H., additional, Ballinger, Thomas J., additional, Berner, Logan T., additional, Bernhard, Germar H., additional, Bhatt, Uma S., additional, Bjerke, Jarle W., additional, Box, Jason E., additional, Britt, L., additional, Brown, R., additional, Burgess, David, additional, Cappelen, John, additional, Christiansen, Hanne H., additional, Decharme, B., additional, Derksen, C., additional, Drozdov, D. S., additional, Epstein, Howard E., additional, Farquharson, L. M., additional, Farrell, Sinead L., additional, Fausto, Robert S., additional, Fettweis, Xavier, additional, Fioletov, Vitali E., additional, Forbes, Bruce C., additional, Frost, Gerald V., additional, Gerland, Sebastian, additional, Goetz, Scott J., additional, Grooß, Jens-Uwe, additional, Hanna, Edward, additional, Hanssen-Bauer, Inger, additional, Hendricks, Stefan, additional, Ialongo, Iolanda, additional, Isaksen, K., additional, Johnsen, Bjørn, additional, Kaleschke, L., additional, Kholodov, A. L., additional, Kim, Seong-Joong, additional, Kohler, Jack, additional, Labe, Zachary, additional, Ladd, Carol, additional, Lakkala, Kaisa, additional, Lara, Mark J., additional, Loomis, Bryant, additional, Luks, Bartłomiej, additional, Luojus, K., additional, Macander, Matthew J., additional, Malkova, G. V., additional, Mankoff, Kenneth D., additional, Manney, Gloria L., additional, Marsh, J. M., additional, Meier, Walt, additional, Moon, Twila A., additional, Mote, Thomas, additional, Mudryk, L., additional, Mueter, F. J., additional, Müller, Rolf, additional, Nyland, K. E., additional, O’Neel, Shad, additional, Overland, James E., additional, Perovich, Don, additional, Phoenix, Gareth K., additional, Raynolds, Martha K., additional, Reijmer, C. H., additional, Ricker, Robert, additional, Romanovsky, Vladimir E., additional, Schuur, E. A. G., additional, Sharp, Martin, additional, Shiklomanov, Nikolai I., additional, Smeets, C. J. P. P., additional, Smith, Sharon L., additional, Streletskiy, Dimitri A., additional, Tedesco, Marco, additional, Thoman, Richard L., additional, Thorson, J. T., additional, Tian-Kunze, X., additional, Timmermans, Mary-Louise, additional, Tømmervik, Hans, additional, Tschudi, Mark, additional, van As, Dirk, additional, van de Wal, R. S. W., additional, Walker, Donald A., additional, Walsh, John E., additional, Wang, Muyin, additional, Webster, Melinda, additional, Winton, Øyvind, additional, Wolken, Gabriel J., additional, Wood, K., additional, Wouters, Bert, additional, and Zador, S., additional

Published
2020
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37. Weber_et_al._2019__Hardangerjokulen_map – Supplemental material for Evolution of the Norwegian plateau icefield Hardangerjøkulen since the ‘Little Ice Age’

Author

Weber, Paul, Boston, Clare M, Lovell, Harold, and Andreassen, Liss M

Subjects
History, Geography
Abstract

Supplemental material, Weber_et_al._2019__Hardangerjokulen_map for Evolution of the Norwegian plateau icefield Hardangerjøkulen since the ‘Little Ice Age’ by Paul Weber, Clare M Boston, Harold Lovell and Liss M Andreassen in The Holocene

Published
2019
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38. Glaciological investigations in Norway 2018

Author

Andreassen, Liss M., Elvehøy, Hallgeir, Jackson, Miriam, and Kjøllmoen, Bjarne

Subjects
Snø, Volumendring, Snøakkumulasjon, Massebalanse, Glasiologi
Abstract

Results of glaciological investigations performed at Norwegian glaciers in 2018 are presented in this report. The main part concerns mass balance investigations. Results from investigations of glacier length changes are discussed in a separate chapter.

Published
2019

39. SenDiT: The sentinel-2 displacement toolbox with application to glacier surface velocities

Author

Nagy, Teodor, Andreassen, Liss M., Duller, Robert A., González, Pablo J., Nagy, Teodor, Andreassen, Liss M., Duller, Robert A., and González, Pablo J.

Abstract

Satellite imagery represents a unique opportunity to quantify the spatial and temporal changes of glaciers world-wide. Glacier velocity has been measured from repeat satellite scenes for decades now, yet a range of satellite missions, feature tracking programs, and user approaches have made it a laborious task. To date, there has been no tool developed that would allow a user to obtain displacement maps of any specified glacier simply by establishing the key temporal, spatial and feature tracking parameters. This work presents the application and development of a unique, semi-automatic, open-source, flexible processing toolbox for the retrieval of displacement maps with a focus on obtaining glacier surface velocities. SenDiT combines the download, pre-processing, feature tracking, and postprocessing of the highest resolution Sentinel-2A and Sentinel-2B satellite images into a semi-automatic toolbox, leaving a user with a set of rasterized and georeferenced glacier flow magnitude and direction maps for their further analyses. The solution is freely available and is tailored so that non-glaciologists and people with limited geographic information system (GIS) knowledge can also benefit from it. The system can be used to provide both regional and global sets of ice velocities. The system was tested and applied on a range of glaciers in mainland Norway, Iceland, Greenland and New Zealand. It was also tested on areas of stable terrain in Libya and Australia, where sources of error involved in the feature tracking using Sentinel-2 imagery are thoroughly described and quantified.

Published
2019

40. Glaciological investigations in Norway 2017

Author

Kjøllmoen, Bjarne, Andreassen, Liss M., Elvehøy, Hallgeir, Jackson, Miriam, and Kjøllmoen, Bjarne

Subjects
Snø, Volumendring, Snøakkumulasjon, Massebalanse, Glasiologi
Abstract

Results of glaciological investigations performed at Norwegian glaciers in 2017 are presented in this report. The main part concerns mass balance investigations. Results from investigations of glacier length changes are discussed in a separate chapter.

Published
2018

43. Glaciers and ice caps outside Greenland

Author

Sharp, Martin J., Wouters, B., Wolken, G., Andreassen, Liss M., Burgess, D.J., Copland, L., Kohler, J., O'Neel, S., Pelto, M.S., Thomson, L., Thorsteinsson, T., Sharp, Martin J., Wouters, B., Wolken, G., Andreassen, Liss M., Burgess, D.J., Copland, L., Kohler, J., O'Neel, S., Pelto, M.S., Thomson, L., and Thorsteinsson, T.

Published
2018

44. Glaciers and ice caps outside Greenland

Author

Sub Dynamics Meteorology, Marine and Atmospheric Research, Sharp, Martin J., Wouters, B., Wolken, G., Andreassen, Liss M., Burgess, D.J., Copland, L., Kohler, J., O'Neel, S., Pelto, M.S., Thomson, L., Thorsteinsson, T., Blunden, Jessica, S. Arndt, Derek, Hartfield, Gail, Sub Dynamics Meteorology, Marine and Atmospheric Research, Sharp, Martin J., Wouters, B., Wolken, G., Andreassen, Liss M., Burgess, D.J., Copland, L., Kohler, J., O'Neel, S., Pelto, M.S., Thomson, L., Thorsteinsson, T., Blunden, Jessica, S. Arndt, Derek, and Hartfield, Gail

Published
2018

45. The European mountain cryosphere: a review of its current state, trends, and future challenges

Author

Beniston, Martin, Farinotti, Daniel, Stoffel, Markus, Andreassen, Liss M., Coppola, Erika, Eckert, Nicolas, Fantini, Adriano, Giacona, Florie, Hauck, Christian, Huss, Matthias, Huwald, Hendrik, Lehning, Michael, Lopez-Moreno, Juan-Ignacio, Magnusson, Jan, Marty, Christoph, Moran-Tejeda, Enrique, Morin, Samuel, Naaim, Mohamed, Provenzale, Antonello, Rabatel, Antoine, Six, Delphine, Stötter, johann, Strasser, Ulrich, Terzago, Silvia, Vincent, Christian., Beniston, Martin, Farinotti, Daniel, Stoffel, Markus, Andreassen, Liss M., Coppola, Erika, Eckert, Nicolas, Fantini, Adriano, Giacona, Florie, Hauck, Christian, Huss, Matthias, Huwald, Hendrik, Lehning, Michael, Lopez-Moreno, Juan-Ignacio, Magnusson, Jan, Marty, Christoph, Moran-Tejeda, Enrique, Morin, Samuel, Naaim, Mohamed, Provenzale, Antonello, Rabatel, Antoine, Six, Delphine, Stötter, johann, Strasser, Ulrich, Terzago, Silvia, and Vincent, Christian.

Abstract

The mountain cryosphere of mainland Europe is recognized to have important impacts on a range of environmental processes. In this paper, we provide an overview on the current knowledge on snow, glacier, and permafrost processes, as well as their past, current, and future evolution. We additionally provide an assessment of current cryosphere research in Europe and point to the different domains requiring further research. Emphasis is given to our understanding of climate–cryosphere interactions, cryosphere controls on physical and biological mountain systems, and related impacts. By the end of the century, Europe’s mountain cryosphere will have changed to an extent that will impact the landscape, the hydrological regimes, the water resources, and the infrastructure. The impacts will not remain confined to the mountain area but also affect the downstream lowlands, entailing a wide range of socio-economical consequences. European mountains will have a completely different visual appearance, in which low- and mid-range-altitude glaciers will have disappeared and even large valley glaciers will have experienced significant retreat and mass loss. Due to increased air temperatures and related shifts from solid to liquid precipitation, seasonal snow lines will be found at much higher altitudes, and the snow season will be much shorter than today. These changes in snow and ice melt will cause a shift in the timing of discharge maxima, as well as a transition of runoff regimes from glacial to nival and from nival to pluvial. This will entail significant impacts on the seasonality of high-altitude water availability, with consequences for water storage and management in reservoirs for drinking water, irrigation, and hydropower production. Whereas an upward shift of the tree line and expansion of vegetation can be expected into current periglacial areas, the disappearance of permafrost at lower altitudes and its warming at higher elevations will likely result in mass movements

Published
2018
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46. Glaciers and ice caps outside Greenland

Author

Wolken, G., Sharp, Martin J., Andreassen, Liss M., Burgess, D.J., Copland, L., Kohler, J., O'Neel, S., Pelto, M.S., Thomson, L., Wouters, B., Sub Dynamics Meteorology, and Marine and Atmospheric Research

Published
2017

47. Glaciological investigations in Norway 2016

Author

Andreassen, Liss M., Elvehøy, Hallgeir, Jackson, Miriam, Melvold, Kjetil, Kjøllmoen, Bjarne, and Kjøllmoen, Bjarne

Subjects
Snø, Volumendring, Snøakkumulasjon, Massebalanse, Glasiologi
Abstract

Results of glaciological investigations performed at Norwegian glaciers in 2016 are presented in this report. The main part concerns mass balance investigaions. Results from investigations of glacier length changes are discussed in a separate chapter.

Published
2017

49. The European mountain cryosphere: a review of its current state, trends, and future challenges

Author

Beniston, Martin, primary, Farinotti, Daniel, additional, Stoffel, Markus, additional, Andreassen, Liss M., additional, Coppola, Erika, additional, Eckert, Nicolas, additional, Fantini, Adriano, additional, Giacona, Florie, additional, Hauck, Christian, additional, Huss, Matthias, additional, Huwald, Hendrik, additional, Lehning, Michael, additional, López-Moreno, Juan-Ignacio, additional, Magnusson, Jan, additional, Marty, Christoph, additional, Morán-Tejéda, Enrique, additional, Morin, Samuel, additional, Naaim, Mohamed, additional, Provenzale, Antonello, additional, Rabatel, Antoine, additional, Six, Delphine, additional, Stötter, Johann, additional, Strasser, Ulrich, additional, Terzago, Silvia, additional, and Vincent, Christian, additional

Published
2018
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