Workshop 2.3.B:
Consequences of climate change for the cryosphere
ID: 247
Workshop & Poster
How much ice is preserved on the Southern Andes
The ice volume preserved on glaciers is a key variable to quantify, among others, their importance as future water resources and their potential contribution for sea level rise. The most used and easy to apply the method to retrieve the ice volume is the scaling Volume-Area approach. This method relies on the empirical relationship between the area of the glacier and its volume of ice. The accuracy of this approach depends on the fitness of the empirical relationship and the accuracy of the glacier mapping. The former is assessed by local ice thickness measurements and volume estimation. Meanwhile, the way glaciers are charted or inventoried is hardly evaluated.
Here we present the ice volume calculation for all glaciers along the Southern Andes using the simple Volume-Area approach and two independent glacier inventories, the well-known Randolph Glacier Inventory (RGI version 6.0) and the new publicly available National Glacier Inventories of Argentina and Chile. We apply the same method to both inventories with the aim to analyze their effect on the ice volume calculation.
Our preliminary results showed that the RGI slightly overestimate (~4%) the ice volume along the Southern Andes compared to the local inventories. Although this could be assumed to be related to the slightly higher (<1%) glacier area in the RGI compared to the local inventories, we found substantial differences between the RGI and the local inventories which best explains the bias. We saw an overestimation of glaciers largest than 1km2 and an underestimation of very small glaciers (<0.5 km2), debris-covered glaciers and rock glaciers at RGI against local inventories. Differences may not have a substantial impact for potential sea level rise calculation, but they will have a significant effect on future water resources calculation, especially where rock-glaciers and debris-covered glaciers are more common than debris-free glaciers.
ID: 253
Workshop & Poster
What is the influence of debris cover on mountain glaciers response to climate?
Keywords: glacier, meltwater, debris
Nicholson, Lindsey; Wirbel, Anna
University of Innsbruck, Austria
My research focuses on understanding how rock debris accumulating on the surface of a glacier affects its behaviour.
In particular:
What controls if, where, and how fast rocks form a surface cover over a shrinking glacier?
Will it accelerate or retard the glacier recession in the coming years?
Is this effect significant?
Should water planners consider it in their projections of glacier runoff?
How will it affect glacier hazard potential?
The answers to all of these are complicated, and in part it depends on the climate the glacier is in, its surrounding terrain, and where it sits on the evolutionary pathway between a healthy clean ice glacier and, after a lot of glacier shrinkage, a much reduced glacier with a very well developed debris cover.
I use field measuremetns, numerical modelling and remote sensing to try and enage in multidisciplinary work to address these questions.
Does it matter that glaciers get dirtier as they shrink?
As mountain glaciers shrink, many of them become more dirty. This is because the glaciers are losing snow and ice, but the amount of rocks and dust melting out of the ice or falling or blowing onto the glacier from the from the surroundings is increasing at the same time.
This layer of rocks on the surface changes how the glacier melts, and my research is about how this affects the overall glacier behaviour. I want to find out:
What controls if, where, and how fast rocks form a surface cover over a shrinking glacier?
Will such a rock layer make glaciers shrink faster or slower?
Will it change the amount of meltwater coming from the glaciers?
Is it important to include the effect of surface rocks in forecasts of water availablility and glacier change?
How will it affect glacier hazard potential?
The answers to all of these are complicated, and in part it depends on the climate the glacier is in, its surrounding terrain, and where it sits on the evolutionary pathway between a healthy clean ice glacier and, after a lot of glacier shrinkage, a much reduced glacier with a very well developed debris cover.
ID: 341
Workshop & Poster
The glaciers are becoming greener - Bioalbedo as accelerator of glacial melt
Keywords: bioalbedo, algae, microbial community, glacial melt
Sattler, Birgit1,2; Weisleitner, Klemens1,2; Obwegeser, Sabrina1; Walder, Theresa1
1University of Innsbruck, Austria; 2Austrian Polar Research Institute
Glaciers are becoming greener – what sounds here quite picturesque is a warning signal for the environmental status of our glaciers. With this saying we understand a coupling effect on supraglacial surfaces which has long been neglected in the awareness: Reflectivity (Albedo) is one of the key factors for the increase or decrease of ice masses. Albedo can be reduced substantially by organic or inorganic particles which absorb solar energy and contribute to the warming of the surface. Supraglacial areas are also habitat for mainly microbial living communities such as bacteria, algae or fungi. Algae can protect themselves from damaging UV-radiation by darker pigmentation which results in a darkening of the surface. The darker coloration is increasing the availability of liquid water, hence again the growth of microbial communities. This biologically induced impact on albedo is called “bioalbedo” which has never been taken into account in climate models. So far we have most information on bioalbedo on arctic glaciers which is quite a shame that literally nothing is known about alpine glaciers. Hence, the motivation to work on alpine sites is even larger.
The aim of this interdisciplinary study is a quantification and qualification of organic and inorganic particles on an alpine glacier (Jamtalferner). Moreover, we aim to establish a non-invasive method called L.I.F.E. (Laser induced fluorescent emission) to quantify phototrophic pigments in high resolution. Results show an increasing autotrophic and heterotrophic activity with increasing level of coverage which might be due to the effect of bioalbedo.
ID: 346
Workshop & Poster
Optimizing a distributed glacier mass balance model for Brewster Glacier
Keywords: Glacier, mass balance, cryosphere, modelling, calibration
Prince, Hamish; Cullen, Nicolas
University of Otago, New Zealand
A distributed, empirical, mass balance model has been developed for Brewster Glacier (Southern Alps, New Zealand) to accurately assess the ongoing changes of alpine glaciers, a key hydrological resource in the South Island of New Zealand. The performance of the model to reconstruct mass balance is considered by comparing to distributed in-situ glaciological measurements between 2004 and 2018. Model components are addressed in-depth, identifying the various challenges of modelling glacier mass balance in a data-sparse environment.
Downscaled meteorological datasets can provide accurate temperature and precipitation data, facilitating the running of empirical models outside the temporal extent of surface observations. Accumulation components introduce large uncertainties into the model due to the lack of accurate snowfall data to calibrate a precipitation phase transition. Calculated extraterrestrial irradiance allows for a temperature-index ablation component to consider seasonal variations in incoming shortwave radiation. The ablation component is calibrated to point-scale measurements of the surface mass balance based on the surface energy balance. Large discrepancies arise when the relative proportions of the surface energy balance vary, such as during warm and moist conditions, when the turbulent heat fluxes dominate the energy balance.
The spatial distribution of parameters calibrated at the point scale produces significant uncertainty, resulting in annual ablation at the lowest elevations of the glacier being underestimated by 2000 mm w.e., while underestimating accumulation at the highest elevations of the glacier by at least 1000 mm w.e. Altitudinal variation due to a temperature lapse and shaded topography does not capture observed variation in mass balance, demonstrating the importance of the spatial variation of energy fluxes. The calibration of empirical factors from a single point on a glacier may not be suitable for representing the conditions over the entire glacier, raising questions regarding the accuracy of distributed mass balance models and the method of parameter calibration.ID: 352
Workshop & Poster
The influence of weather systems on future changes in seasonal snow and glaciers
Keywords: mountain climate, synoptic weather, climate change
Cullen, Nicolas James
University of Otago, New Zealand
One of the challenges in resolving changes in seasonal snow and glaciers in the coming century in mountainous regions across the world may in some cases be linked to separating regional variability or trends in large-scale atmospheric circulation from background global warming. For example, the well documented advance of some fast-responding glaciers in New Zealand between 1983 and 2008 clearly showed that regional variability in atmospheric circulation can temporarily counteract the effects of global warming. There is evidence from climate models that the frequency of certain weather patterns in the New Zealand region may not remain stationary throughout the 21st century, with projections for increased anticyclonic conditions in winter months. Therefore, any future prediction of the response of glaciers in the Southern Alps to climate change may be required to consider the possibility of future trends in circulation. How much faith can we put into climate model predictions of weather patterns in the coming century and do they warrant further analysis? Do we anticipate that the increase in air temperatures globally will be so dominant that any future trends in weather patterns will be masked out by the drastic decline of glaciers, and reduction in seasonal snow?
ID: 370
Workshop & Poster
Future snow cover in the alps: Using MODIS satellite observations to bias correct snow cover from the EURO-CORDEX regional climate model ensemble
Matiu, Michael; Petitta, Marcello; Notarnicola, Claudia; Premier, Valentina; Zebisch, Marc
Eurac Research, Italy
ID: 450
Workshop & Poster
A statistical framework to infer climatic trends in mountain cryospheric processes and its application to snow extremes, snow avalanches and glaciers
Keywords: Statistical modelling, snow extremes, snow avalanches, glaciers
Eckert, Nicolas1; Giacona, Florie1; Corona, Christophe2; Morin, Samuel3; Nicolet, Gilles4; Thibert, Emmanuel1
1Univ. Grenoble Alpes, Irstea, ETNA, Grenoble, France; 2Geolab, Clermont-Ferrand, France; 3Univ. Grenoble Alpes, Université de Toulouse, Météo-France, Grenoble, France, CNRS, CNRM, Centre d'Etudes de la Neige, Grenoble, France; 4Univ. Grenoble Alpes, IGE, Grenoble, France
ID: 495
Workshop & Poster
The contribution of the GLIMS glacier database and the RGI to studies of the cryosphere and hydrosphere: Status, challenges and outlook
Keywords: GLIMS, RGI, remote sensing, glacier inventory, Sentinel 2
Paul, Frank; Rastner, Philipp; Goerlich, Franz
University of Zurich, Switzerland
Precise knowledge of glacier extents is mandatory for nearly all calculations related to glaciers (e.g. mass balance, future evolution, run-off, sea level contribution) as their area is either used as a multiplicative factor or to spatially constrain observations. The quality of the related glacier outline datasets thus directly impacts on the quality of the derived products. Due to debris cover and clouds, however, delineation of glaciers is not automatic and requires careful and laborious manual editing.
Accordingly, most applications and models use glacier outline datasets that are readily available from the (multi-temporal) GLIMS database or the RGI. While both are continuously updated and improved by the scientific community, not all datasets have the quality required for local to regional scale glaciologic or hydrologic applications. Moreover, updates are often by chance and consistency in the interpretation is lacking across analysts. The latter is in part due to the so far used 30 m resolution Landsat images that have indeed limits in interpretation.
However, with today’s 10 m resolution Sentinel-2 images visual interpretation has much improved and the quality of glacier outlines is in general much higher. Additionally, the 5-day repeat cycle offers unprecedented opportunities to acquire cloud-free images near the end of the ablation period and trace fast processes such as the temporal evolution of snow cover or surging glaciers in full detail. Along with an increasing use of automated processing lines, a true monitoring of glaciers and other cryospheric elements is now possible. However, data dissemination and links to the hydrologic modelling community can still be improved and related possibilities should be discussed at the workshop.
ID: 509
Workshop & Poster
Rwenzori glaciers in Africa: a natural laboratory for glaciological and environmental purposes
Keywords: glaciers, Africa, Rwenzori, remote sensing, field mapping, photogrammetry, UAV, rock fall dynamics
Samyn, Denis
ICIMOD, Nepal
ID: 538
Workshop & Poster
Tracing cryo-hydro-social transformations in the tropical Andes
Keywords: glacier volume loss; tropical Andes; hydro-social risk; water quality
Mark, Bryan1; McKenzie, Jeffrey2; Baraer, Michel3; Hellstrom, Robert4; Fernandez, Alfonso5; Somers, Lauren2; Huh, Kyung In6; La Frenierre, Jeff7; Wigmore, Oliver8; Schoessow, Forrest1; Lautz, Laura9
1Ohio State University - Columbus, OH, United States of America; 2McGill University - Montreal, Canada; 3University of Quebec ETS - Montreal, Canada; 4Bridgewater State University - Bridgewater, MA, USA; 5University of Concepcion - Concepcion, Chile; 6CalPoly Pamona - Pamona, CA, USA; 7Gustavus Adolphus College - Saint Peter, MN, USA; 8University of Colorado, INSTAAR - Boulder, CO, USA; 9Syracuse University - Syracuse, NY, USA
ID: 145
Specific Research Poster
Contrasting predicted changes in glacier volume and runoff from variable atmospheric forcings and initial conditions at Peyto basin, Canada
Keywords: glacier runoff, atmospheric forcings, mass balance, projected change
Aubry-Wake, Caroline; Pomeroy, John W.
University of Saskatchewan, Canada
ID: 259
Specific Research Poster
The ice-volcano interaction on the Cotopaxi volcano through the analysis and GIS modeling of the changing characteristics of the glaciers after the eruptive event of 2015
Keywords: Glacier, volcano, Tropical Andes
BASTIDAS-ORTEGA, LENIN ENRIQUE
Eötvös Loránd University, Hungary
Cotopaxi has several studies about the historical eruptions and the hazards that it could produce. Glacier Inventory which includes, among others, changes of glacier coverage by aerial photographs, one determination of the glacier volume by ground penetrating radar (GPR), and the interaction between the glacier and the volcanic activity by ice cracking (Métaxian et al., 2003)
Cotopaxi has 19 glaciers which are very important, for mitigating their hazards in the case of an eruption., A recession of the surface of the glaciers was the 30% it has been detected by photogrammetry between 1956 and 1997 (Jordan et al., 2005). In 2015 the volcano showed very strong signals of reactivation. The Geophysics Institute of Ecuador (IG) has been monitoring the volcano some years. It reported the increase of seismic activity, deformation, ash plumes, and ash fall, SO2 emissions, fumarolic activity, and lahars.
The research analyzes the changes of the thickness and the volume of the glacier based in historical information and collection of data by remote sensing technics, ground penetration radar, geodesic methods, and field trip work. It is in process an updating of the measuring of the thickness of the glacier in the northern and eastern areas. The data combinate with high digital elevation model to detect changes of the glacier after the eruptive process started in 2015.ID: 329
Specific Research Poster
Land-terminating ice cliffs in North Greenland under climate change
Prinz, Rainer1,2,3; Abermann, Jakob2,3; Steiner, Jakob4
1University of Innsbruck, Austria; 2University of Graz, Austria; 3Austrian Polar Research Institute; 4University of Utrecht, Netherlands
Wide parts of the ice sheet in North Greenland terminate as cliffs on land. However, the characteristics of this feature and its response to a changing climate have so far received little attention. While land-terminating ice cliffs are studied in other regions, detailed investigations in Greenland were carried out only more than six decades ago in the Thule area (Red Rock, Northwest Greenland). These studies showed a continuous advance over one decade, despite the local mass balance was reported negative.
A reconnaissance expedition to the Red Rock ice cliff in summer 2017 applying a suite of geophysical surveys approves the counterintuitive combination of negative mass balance and terminus advance. Additional remote sensing data confirms that the cliff position at Red Rock was advancing at rates of several meters per year until at least the early 2000s and is constant or slowly retreating during the last years. Complementary to morphological studies, we investigate processes and drivers of the ice cliff evolution. With data from our recent field experiment we show that under the same atmospheric forcing the mass balance response of the cliff front is different to the horizontal glacier surface above the cliff. Hence, the cliff morphology determines different energy balance regimes with specific sensitivities to climate. Understanding these sensitivities and their interdependency to ice dynamics, we hypothesize that even if the ice cliff amount or surface area might be negligible, studying ice cliffs would increase our knowledge to wide parts upstream the ice sheet and to its larger scale climatic controls.ID: 434
Specific Research Poster
The effects of the hot summers of 2015 & 2018 on the spatial-temporal permafrost evolution at the Zugspitze
Keywords: permafrost, Zugspitze, monitoring, ERT, model
Schroeder, Tanja; Scandroglio, Riccardo; Stammberger, Verena; Wittmann, Maximilian; Krautblatter, Michael
Technical University of Munich, Germany
Permafrost degradation is a key parameter driving climate change induced rock slope instabilities in high mountain areas. The temperature sensitivity of thermal and mechanical rock properties demand for novel high-grade monitoring and modelling campaigns to deduce possible hazards. Electrical resistivity tomography (ERT) became the first choice tool for permafrost monitoring in the alpine space in recent decades.
Here, we present the effects of seasonal and extreme weather events on the annual permafrost distribution at the Zugspitze within an 11-year ERT-monitoring program. The quantitative interpretation of ERT-data for frozen rock temperatures is based on the resistivity-temperature laboratory calibration on Wettersteinkalk (Zugspitze) by Krautblatter et al. (2010).
Our preliminary results are:
- The natural thermal regime of steep rock walls is reproduced by ERT-temperature data and validated via a climate-driven thermal model.
- Solar radiation forcing affects rock wall temperatures with a signal propagation time of ca. 2 months, largely via conductive energy transport.
- 11 years of ERT data validate the resistivity temperature relationship for a natural rock wall environment. Moreover, we can distinguish periodical and uniquely effects due to annual seasonality and extreme weather events.
- The summers of 2018 and 2015 record the highest yet measured permafrost core temperatures at the Zugspitze. Highly fractured zones display specific warming patterns of the adjacent rock mass.
We further present an approach to the thermo-geophysical modelling of permafrost temperatures in steep rock walls with high spatial resolution linking apparent resistivities, ground thermal properties and meteorological data. Further we intent to model past and future permafrost / rock temperature conditions at the Zugspitze in the realm of climate change.
Krautblatter, M., Verleysdonk, S., Flores-Orozco, A. & Kemna, A. (2010): Temperature-calibrated imaging of seasonal changes in permafrost rock walls by quantitative electrical resistivity tomography (Zugspitze, German/Austrian Alps). J. Geophys. Res. 115: F02003.ID: 437
Specific Research Poster
Webcam images for estimating the snow cover and snow depth in the alpine region
Keywords: Webcam images; Snow cover; Snow depth; Sentinel; Image matching
Piermattei, Livia1,2; Ressl, Camillo1; Puercher, Gerhard1; Schwaizer, Gabriele3; Nagler, Thomas3; Marty, Mauro4; Ginzler, Christian4; Flöry, Sebastian1; Hollaus, Markus1; Pfeifer, Norbert1
1Department of Geodesy and Geoinformation, TU Wien, Austria; 2Physical Geography, Catholic University of Eichstaett-Ingolstadt, Germany; 3ENVEO Environmental Earth Observation Information Technology GmbH, Austria; 4Swiss Federal Institute for Forest, Snow and Landscape Research, WSL, Switzerland
ID: 451
Specific Research Poster
Snow and glacier hydrology response to drought conditions under global warming scenarios in the extra tropical Andes Cordillera: a water security approach
Keywords: Water security, snow dynamics, Glaciohydrology, Andes
McPhee, James Peter1; Videla, Yohann1; Ayala, Alvaro2; Pellicciotti, Francesca3
1Universidad de Chile, Chile; 2Centro de Estudios Avanzados en Zonas Áridas, Chile; 3Swiss Federal Research Institute WSL, Switzerland
ID: 464
Specific Research Poster
Inter- and intra-annual runoff variability in glacierized catchments of the Eastern Italian Alps: an interdisciplinary approach using wavelet technique and tracer-based analysis
Keywords: runoff dynamics, snow and ice melt, tracers, spectral analysis
Engel, Michael1; Penna, Daniele2; Nadalet, Rudi3; Dinale, Roberto3; Bertoldi, Giacomo4; Notarnicola, Claudia5; Comiti, Francesco1
1Free University of Bozen-Bolzano, Italy; 2University of Florence, Italy; 3Hydrographic Office, Autonomous Province of Bozen-Bolzano, Italy; 4Institute for Alpine Environment, Eurac Research, Italy; 5Institute for Earth Observation, Eurac Research, Italy
ID: 503
Specific Research Poster
The Open Global Glacier Model (OGGM)
Keywords: glacier, modelling, global
Maussion, Fabien1; Dusch, Matthias1; Marzeion, Ben2
1Universität Innsbruck, Austria; 2Universität Bremen, Germany