Articles | Volume 14, issue 12
https://doi.org/10.5194/tc-14-4699-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/tc-14-4699-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Spatio-temporal flow variations driving heat exchange processes at a mountain glacier
Rebecca Mott
CORRESPONDING AUTHOR
WSL Institute for Snow and Avalanche Research SLF, Davos, Switzerland
Institute of Meteorology and Climate Research, Atmospheric
Environmental Research (KIT/IMK-IFU), Garmisch-Partenkirchen, Germany
Ivana Stiperski
Department of Atmospheric and Cryospheric Sciences, University of
Innsbruck, Innsbruck, Austria
Lindsey Nicholson
Department of Atmospheric and Cryospheric Sciences, University of
Innsbruck, Innsbruck, Austria
Related authors
Jan Magnusson, Yves Bühler, Louis Quéno, Bertrand Cluzet, Giulia Mazzotti, Clare Webster, Rebecca Mott, and Tobias Jonas
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-374, https://doi.org/10.5194/essd-2024-374, 2024
Revised manuscript under review for ESSD
Short summary
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In this study, we present a dataset for the Dischma catchment in eastern Switzerland, which represents a typical high-alpine watershed in the European Alps. Accurate monitoring and reliable forecasting of snow and water resources in such basins are crucial for a wide range of applications. Our dataset is valuable for improving physics-based snow, land-surface, and hydrological models, with potential applications in similar high-alpine catchments.
Dylan Reynolds, Louis Quéno, Michael Lehning, Mahdi Jafari, Justine Berg, Tobias Jonas, Michael Haugeneder, and Rebecca Mott
The Cryosphere, 18, 4315–4333, https://doi.org/10.5194/tc-18-4315-2024, https://doi.org/10.5194/tc-18-4315-2024, 2024
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Information about atmospheric variables is needed to produce simulations of mountain snowpacks. We present a model that can represent processes that shape mountain snowpack, focusing on the accumulation of snow. Simulations show that this model can simulate the complex path that a snowflake takes towards the ground and that this leads to differences in the distribution of snow by the end of winter. Overall, this model shows promise with regard to improving forecasts of snow in mountains.
Louis Quéno, Rebecca Mott, Paul Morin, Bertrand Cluzet, Giulia Mazzotti, and Tobias Jonas
The Cryosphere, 18, 3533–3557, https://doi.org/10.5194/tc-18-3533-2024, https://doi.org/10.5194/tc-18-3533-2024, 2024
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Snow redistribution by wind and avalanches strongly influences snow hydrology in mountains. This study presents a novel modelling approach to best represent these processes in an operational context. The evaluation of the simulations against airborne snow depth measurements showed remarkable improvement in the snow distribution in mountains of the eastern Swiss Alps, with a representation of snow accumulation and erosion areas, suggesting promising benefits for operational snow melt forecasts.
Dylan Reynolds, Ethan Gutmann, Bert Kruyt, Michael Haugeneder, Tobias Jonas, Franziska Gerber, Michael Lehning, and Rebecca Mott
Geosci. Model Dev., 16, 5049–5068, https://doi.org/10.5194/gmd-16-5049-2023, https://doi.org/10.5194/gmd-16-5049-2023, 2023
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The challenge of running geophysical models is often compounded by the question of where to obtain appropriate data to give as input to a model. Here we present the HICAR model, a simplified atmospheric model capable of running at spatial resolutions of hectometers for long time series or over large domains. This makes physically consistent atmospheric data available at the spatial and temporal scales needed for some terrestrial modeling applications, for example seasonal snow forecasting.
Rebecca Mott, Andreas Wolf, Maximilian Kehl, Harald Kunstmann, Michael Warscher, and Thomas Grünewald
The Cryosphere, 13, 1247–1265, https://doi.org/10.5194/tc-13-1247-2019, https://doi.org/10.5194/tc-13-1247-2019, 2019
Short summary
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The mass balance of very small glaciers is often governed by anomalous snow accumulation, winter precipitation being multiplied by snow redistribution processes, or by suppressed snow ablation driven by micrometeorological effects lowering net radiation and turbulent heat exchange. In this study we discuss the relative contribution of snow accumulation (avalanches) versus micrometeorology (katabatic flow) on the mass balance of the lowest perennial ice field of the Alps, the Ice Chapel.
Rebecca Mott, Enrico Paterna, Stefan Horender, Philip Crivelli, and Michael Lehning
The Cryosphere, 10, 445–458, https://doi.org/10.5194/tc-10-445-2016, https://doi.org/10.5194/tc-10-445-2016, 2016
Short summary
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For the first time, this contribution investigates atmospheric decoupling above melting snow in a wind tunnel study. High-resolution vertical profiles of
sensible heat fluxes are measured directly over the melting snow patch.
The study shows that atmospheric decoupling is strongly increased in topographic sheltering but only for low wind velocities. Then turbulent mixing close to the surface is strongly suppressed, facilitating the formation of cold-air pooling in local depressions.
Jan Magnusson, Yves Bühler, Louis Quéno, Bertrand Cluzet, Giulia Mazzotti, Clare Webster, Rebecca Mott, and Tobias Jonas
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2024-374, https://doi.org/10.5194/essd-2024-374, 2024
Revised manuscript under review for ESSD
Short summary
Short summary
In this study, we present a dataset for the Dischma catchment in eastern Switzerland, which represents a typical high-alpine watershed in the European Alps. Accurate monitoring and reliable forecasting of snow and water resources in such basins are crucial for a wide range of applications. Our dataset is valuable for improving physics-based snow, land-surface, and hydrological models, with potential applications in similar high-alpine catchments.
Dylan Reynolds, Louis Quéno, Michael Lehning, Mahdi Jafari, Justine Berg, Tobias Jonas, Michael Haugeneder, and Rebecca Mott
The Cryosphere, 18, 4315–4333, https://doi.org/10.5194/tc-18-4315-2024, https://doi.org/10.5194/tc-18-4315-2024, 2024
Short summary
Short summary
Information about atmospheric variables is needed to produce simulations of mountain snowpacks. We present a model that can represent processes that shape mountain snowpack, focusing on the accumulation of snow. Simulations show that this model can simulate the complex path that a snowflake takes towards the ground and that this leads to differences in the distribution of snow by the end of winter. Overall, this model shows promise with regard to improving forecasts of snow in mountains.
Brigitta Goger, Lindsey Nicholson, Matthis Ouy, and Ivana Stiperski
EGUsphere, https://doi.org/10.5194/egusphere-2024-2634, https://doi.org/10.5194/egusphere-2024-2634, 2024
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We study with simulations if changing glacier ice surfaces surrounding a glacier impacts the atmospheric structure. Under North-Westerly flow conditions, a gravity wave forms over the glacier. This gravity wave is, however, weakened and breaks faster, when the surrounding glaciers are removed. This leads to stronger turbulent mixing over the remaining glacier and higher temperatures. This affects glacier melting patterns, and glaciers should be studied as a system.
Louis Quéno, Rebecca Mott, Paul Morin, Bertrand Cluzet, Giulia Mazzotti, and Tobias Jonas
The Cryosphere, 18, 3533–3557, https://doi.org/10.5194/tc-18-3533-2024, https://doi.org/10.5194/tc-18-3533-2024, 2024
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Snow redistribution by wind and avalanches strongly influences snow hydrology in mountains. This study presents a novel modelling approach to best represent these processes in an operational context. The evaluation of the simulations against airborne snow depth measurements showed remarkable improvement in the snow distribution in mountains of the eastern Swiss Alps, with a representation of snow accumulation and erosion areas, suggesting promising benefits for operational snow melt forecasts.
Calvin Beck and Lindsey Nicholson
EGUsphere, https://doi.org/10.5194/egusphere-2023-2766, https://doi.org/10.5194/egusphere-2023-2766, 2023
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A glacier’s debris cover strongly modified its mass balance in contrast to a clean ice glacier. A key parameter for calculating sub-debris melt is the thermal diffusivity of the debris layer. Conway and Rasmussen (2000) present a method to estimate this value based on simple heat diffusion principles. Our analysis shows that the selected temporal and spatial sampling intervals effects the estimated value of thermal diffusivity, resulting in glacier melt being systematically underestimated.
Dylan Reynolds, Ethan Gutmann, Bert Kruyt, Michael Haugeneder, Tobias Jonas, Franziska Gerber, Michael Lehning, and Rebecca Mott
Geosci. Model Dev., 16, 5049–5068, https://doi.org/10.5194/gmd-16-5049-2023, https://doi.org/10.5194/gmd-16-5049-2023, 2023
Short summary
Short summary
The challenge of running geophysical models is often compounded by the question of where to obtain appropriate data to give as input to a model. Here we present the HICAR model, a simplified atmospheric model capable of running at spatial resolutions of hectometers for long time series or over large domains. This makes physically consistent atmospheric data available at the spatial and temporal scales needed for some terrestrial modeling applications, for example seasonal snow forecasting.
Adina E. Racoviteanu, Lindsey Nicholson, and Neil F. Glasser
The Cryosphere, 15, 4557–4588, https://doi.org/10.5194/tc-15-4557-2021, https://doi.org/10.5194/tc-15-4557-2021, 2021
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Supraglacial debris cover comprises ponds, exposed ice cliffs, debris material and vegetation. Understanding these features is important for glacier hydrology and related hazards. We use linear spectral unmixing of satellite data to assess the composition of map supraglacial debris across the Himalaya range in 2015. One of the highlights of this study is the automated mapping of supraglacial ponds, which complements and expands the existing supraglacial debris and lake databases.
Rebecca Mott, Andreas Wolf, Maximilian Kehl, Harald Kunstmann, Michael Warscher, and Thomas Grünewald
The Cryosphere, 13, 1247–1265, https://doi.org/10.5194/tc-13-1247-2019, https://doi.org/10.5194/tc-13-1247-2019, 2019
Short summary
Short summary
The mass balance of very small glaciers is often governed by anomalous snow accumulation, winter precipitation being multiplied by snow redistribution processes, or by suppressed snow ablation driven by micrometeorological effects lowering net radiation and turbulent heat exchange. In this study we discuss the relative contribution of snow accumulation (avalanches) versus micrometeorology (katabatic flow) on the mass balance of the lowest perennial ice field of the Alps, the Ice Chapel.
Tobias Zolles, Fabien Maussion, Stephan Peter Galos, Wolfgang Gurgiser, and Lindsey Nicholson
The Cryosphere, 13, 469–489, https://doi.org/10.5194/tc-13-469-2019, https://doi.org/10.5194/tc-13-469-2019, 2019
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A mass and energy balance model was subjected to sensitivity and uncertainty analysis on two different Alpine glaciers. The global sensitivity analysis allowed for a mass balance measurement independent assessment of the model sensitivity and functioned as a reduction of the model free parameter space. A novel approach of a multi-objective optimization estimates the uncertainty of the simulated mass balance and the energy fluxes. The final model uncertainty is up to 1300 kg m−3 per year.
Lindsey I. Nicholson, Michael McCarthy, Hamish D. Pritchard, and Ian Willis
The Cryosphere, 12, 3719–3734, https://doi.org/10.5194/tc-12-3719-2018, https://doi.org/10.5194/tc-12-3719-2018, 2018
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Ground-penetrating radar of supraglacial debris thickness is used to study local thickness variability. Freshly emergent debris cover appears to have higher skewness and kurtosis than more mature debris covers. Accounting for debris thickness variability in ablation models can result in markedly different ice ablation than is calculated using the mean debris thickness. Slope stability modelling reveals likely locations for locally thin debris with high ablation.
Christoph Klug, Erik Bollmann, Stephan Peter Galos, Lindsey Nicholson, Rainer Prinz, Lorenzo Rieg, Rudolf Sailer, Johann Stötter, and Georg Kaser
The Cryosphere, 12, 833–849, https://doi.org/10.5194/tc-12-833-2018, https://doi.org/10.5194/tc-12-833-2018, 2018
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This study presents a reanalysis of the glacier mass balance record at Hintereisferner, Austria, for the period 2001 to 2011. We provide a year-by-year comparison of glaciological and geodetic mass balances obtained from annual airborne laser scanning data. After applying a series of corrections, a comparison of the methods reveals major differences for certain years. We thoroughly discuss the origin of these discrepancies and implications for future glaciological mass balance measurements.
Ulrich Strasser, Thomas Marke, Ludwig Braun, Heidi Escher-Vetter, Irmgard Juen, Michael Kuhn, Fabien Maussion, Christoph Mayer, Lindsey Nicholson, Klaus Niedertscheider, Rudolf Sailer, Johann Stötter, Markus Weber, and Georg Kaser
Earth Syst. Sci. Data, 10, 151–171, https://doi.org/10.5194/essd-10-151-2018, https://doi.org/10.5194/essd-10-151-2018, 2018
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A hydrometeorological and glaciological data set is presented with recordings from several research sites in the Rofental (1891–3772 m a.s.l., Ötztal Alps, Austria). The data sets are spanning 150 years and represent a unique pool of high mountain observations, enabling combined research of atmospheric, cryospheric and hydrological processes in complex terrain, and the development of state-of-the-art hydroclimatological and glacier mass balance models.
Anna Wirbel, Alexander H. Jarosch, and Lindsey Nicholson
The Cryosphere, 12, 189–204, https://doi.org/10.5194/tc-12-189-2018, https://doi.org/10.5194/tc-12-189-2018, 2018
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As debris cover affects the meltwater production and behaviour of glaciers it is important to understand how, and over what timescales, it forms. Here we develop an advanced 3-D numerical model that describes transport of sediment through a glacier to the point where it emerges at the surface. The numerical performance of the model is satisfactory and it reproduces debris structures observed within real-world glaciers, thereby offering a useful tool for future studies of debris-covered glaciers.
Ann V. Rowan, Lindsey Nicholson, Emily Collier, Duncan J. Quincey, Morgan J. Gibson, Patrick Wagnon, David R. Rounce, Sarah S. Thompson, Owen King, C. Scott Watson, Tristram D. L. Irvine-Fynn, and Neil F. Glasser
The Cryosphere Discuss., https://doi.org/10.5194/tc-2017-239, https://doi.org/10.5194/tc-2017-239, 2017
Revised manuscript not accepted
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Many glaciers in the Himalaya are covered with thick layers of rock debris that acts as an insulating blanket and so reduces melting of the underlying ice. Little is known about how melt beneath supraglacial debris varies across glaciers and through the monsoon season. We measured debris temperatures across three glaciers and several years to investigate seasonal trends, and found that sub-debris ice melt can be predicted using a temperature–depth relationship with surface temperature data.
Douglas I. Benn, Sarah Thompson, Jason Gulley, Jordan Mertes, Adrian Luckman, and Lindsey Nicholson
The Cryosphere, 11, 2247–2264, https://doi.org/10.5194/tc-11-2247-2017, https://doi.org/10.5194/tc-11-2247-2017, 2017
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This paper provides the first complete view of the drainage system of a large Himalayan glacier, based on ice-cave exploration and satellite image analysis. Drainage tunnels inside glaciers have a major impact on melting rates, by providing lines of weakness inside the ice and potential pathways for melt-water, and play a key role in the response of debris-covered glaciers to sustained periods of negative mass balance.
Stephan Peter Galos, Christoph Klug, Fabien Maussion, Federico Covi, Lindsey Nicholson, Lorenzo Rieg, Wolfgang Gurgiser, Thomas Mölg, and Georg Kaser
The Cryosphere, 11, 1417–1439, https://doi.org/10.5194/tc-11-1417-2017, https://doi.org/10.5194/tc-11-1417-2017, 2017
Lindsey I. Nicholson, Michał Pętlicki, Ben Partan, and Shelley MacDonell
The Cryosphere, 10, 1897–1913, https://doi.org/10.5194/tc-10-1897-2016, https://doi.org/10.5194/tc-10-1897-2016, 2016
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An Xbox Kinect sensor was used as a close-range surface scanner to produce the first accurate 3D surface models of spikes of snow and ice (known as penitentes) that develop in cold, dry, sunny conditions. The data collected show how penitentes develop over time and how they affect the surface roughness of a glacier. These surface models are useful inputs to modelling studies of how penitentes alter energy exchanges between the atmosphere and the surface and how this affects meltwater production.
Rebecca Mott, Enrico Paterna, Stefan Horender, Philip Crivelli, and Michael Lehning
The Cryosphere, 10, 445–458, https://doi.org/10.5194/tc-10-445-2016, https://doi.org/10.5194/tc-10-445-2016, 2016
Short summary
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For the first time, this contribution investigates atmospheric decoupling above melting snow in a wind tunnel study. High-resolution vertical profiles of
sensible heat fluxes are measured directly over the melting snow patch.
The study shows that atmospheric decoupling is strongly increased in topographic sheltering but only for low wind velocities. Then turbulent mixing close to the surface is strongly suppressed, facilitating the formation of cold-air pooling in local depressions.
R. Prinz, L. I. Nicholson, T. Mölg, W. Gurgiser, and G. Kaser
The Cryosphere, 10, 133–148, https://doi.org/10.5194/tc-10-133-2016, https://doi.org/10.5194/tc-10-133-2016, 2016
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Lewis Glacier has lost > 80 % of its extent since the late 19th century. A sensitivity study using a process-based model assigns this shrinking to decreased atmospheric moisture without increasing air temperatures required. The glacier retreat implies a distinctly different coupling between the glacier's surface-air layer and its surrounding boundary layer, underlining the difficulty of deriving palaeoclimates for larger glacier extents on the basis of modern measurements of small glaciers.
E. Collier, F. Maussion, L. I. Nicholson, T. Mölg, W. W. Immerzeel, and A. B. G. Bush
The Cryosphere, 9, 1617–1632, https://doi.org/10.5194/tc-9-1617-2015, https://doi.org/10.5194/tc-9-1617-2015, 2015
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We investigate the impact of surface debris on glacier energy and mass fluxes and on atmosphere-glacier feedbacks in the Karakoram range, by including debris in an interactively coupled atmosphere-glacier model. The model is run from 1 May to 1 October 2004, with a simple specification of debris thickness. We find an appreciable reduction in ablation that exceeds 5m w.e. on glacier tongues, as well as significant alterations to near-surface air temperatures and boundary layer dynamics.
G. Massaro, I. Stiperski, B. Pospichal, and M. W. Rotach
Atmos. Meas. Tech., 8, 3355–3367, https://doi.org/10.5194/amt-8-3355-2015, https://doi.org/10.5194/amt-8-3355-2015, 2015
E. Collier, L. I. Nicholson, B. W. Brock, F. Maussion, R. Essery, and A. B. G. Bush
The Cryosphere, 8, 1429–1444, https://doi.org/10.5194/tc-8-1429-2014, https://doi.org/10.5194/tc-8-1429-2014, 2014
W. Gurgiser, B. Marzeion, L. Nicholson, M. Ortner, and G. Kaser
The Cryosphere, 7, 1787–1802, https://doi.org/10.5194/tc-7-1787-2013, https://doi.org/10.5194/tc-7-1787-2013, 2013
S. MacDonell, C. Kinnard, T. Mölg, L. Nicholson, and J. Abermann
The Cryosphere, 7, 1513–1526, https://doi.org/10.5194/tc-7-1513-2013, https://doi.org/10.5194/tc-7-1513-2013, 2013
L. I. Nicholson, R. Prinz, T. Mölg, and G. Kaser
The Cryosphere, 7, 1205–1225, https://doi.org/10.5194/tc-7-1205-2013, https://doi.org/10.5194/tc-7-1205-2013, 2013
Related subject area
Discipline: Glaciers | Subject: Atmospheric Interactions
Foehn winds at Pine Island Glacier and their role in ice changes
The role of föhn winds in eastern Antarctic Peninsula rapid ice shelf collapse
The distribution and evolution of supraglacial lakes on 79° N Glacier (north-eastern Greenland) and interannual climatic controls
Atmospheric extremes caused high oceanward sea surface slope triggering the biggest calving event in more than 50 years at the Amery Ice Shelf
Measurements and modeling of snow albedo at Alerce Glacier, Argentina: effects of volcanic ash, snow grain size, and cloudiness
Towards understanding the pattern of glacier mass balances in High Mountain Asia using regional climatic modelling
A multi-season investigation of glacier surface roughness lengths through in situ and remote observation
Variability in individual particle structure and mixing states between the glacier–snowpack and atmosphere in the northeastern Tibetan Plateau
Diana Francis, Ricardo Fonseca, Kyle S. Mattingly, Stef Lhermitte, and Catherine Walker
The Cryosphere, 17, 3041–3062, https://doi.org/10.5194/tc-17-3041-2023, https://doi.org/10.5194/tc-17-3041-2023, 2023
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Role of Foehn Winds in ice and snow conditions at the Pine Island Glacier, West Antarctica.
Matthew K. Laffin, Charles S. Zender, Melchior van Wessem, and Sebastián Marinsek
The Cryosphere, 16, 1369–1381, https://doi.org/10.5194/tc-16-1369-2022, https://doi.org/10.5194/tc-16-1369-2022, 2022
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The collapses of the Larsen A and B ice shelves on the Antarctic Peninsula (AP) occurred while the ice shelves were covered with large melt lakes, and ocean waves damaged the ice shelf fronts, triggering collapse. Observations show föhn winds were present on both ice shelves and increased surface melt and drove sea ice away from the ice front. Collapsed ice shelves experienced enhanced surface melt driven by föhn winds, whereas extant ice shelves are affected less by föhn-wind-induced melt.
Jenny V. Turton, Philipp Hochreuther, Nathalie Reimann, and Manuel T. Blau
The Cryosphere, 15, 3877–3896, https://doi.org/10.5194/tc-15-3877-2021, https://doi.org/10.5194/tc-15-3877-2021, 2021
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We assess the climatic controls of melt lake development, melt duration, melt extent, and the spatial distribution of lakes of 79°N Glacier. There is a large interannual variability in the areal extent of the lakes and the maximum elevation of lake development, which is largely controlled by the summertime air temperatures and the snowpack thickness. Late-summer lake development can be prompted by spikes in surface mass balance. There is some evidence of inland expansion of lakes over time.
Diana Francis, Kyle S. Mattingly, Stef Lhermitte, Marouane Temimi, and Petra Heil
The Cryosphere, 15, 2147–2165, https://doi.org/10.5194/tc-15-2147-2021, https://doi.org/10.5194/tc-15-2147-2021, 2021
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The unexpected September 2019 calving event from the Amery Ice Shelf, the largest since 1963 and which occurred almost a decade earlier than expected, was triggered by atmospheric extremes. Explosive twin polar cyclones provided a deterministic role in this event by creating oceanward sea surface slope triggering the calving. The observed record-anomalous atmospheric conditions were promoted by blocking ridges and Antarctic-wide anomalous poleward transport of heat and moisture.
Julián Gelman Constantin, Lucas Ruiz, Gustavo Villarosa, Valeria Outes, Facundo N. Bajano, Cenlin He, Hector Bajano, and Laura Dawidowski
The Cryosphere, 14, 4581–4601, https://doi.org/10.5194/tc-14-4581-2020, https://doi.org/10.5194/tc-14-4581-2020, 2020
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We present the results of two field campaigns and modeling activities on the impact of atmospheric particles on Alerce Glacier (Argentinean Andes). We found that volcanic ash remains at different snow layers several years after eruption, increasing light absorption on the glacier surface (with a minor contribution of soot). This leads to 36 % higher annual glacier melting. We find remarkably that volcano eruptions in 2011 and 2015 have a relevant effect on the glacier even in 2016 and 2017.
Remco J. de Kok, Philip D. A. Kraaijenbrink, Obbe A. Tuinenburg, Pleun N. J. Bonekamp, and Walter W. Immerzeel
The Cryosphere, 14, 3215–3234, https://doi.org/10.5194/tc-14-3215-2020, https://doi.org/10.5194/tc-14-3215-2020, 2020
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Glaciers worldwide are shrinking, yet glaciers in parts of High Mountain Asia are growing. Using models of the regional climate and glacier growth, we reproduce the observed patterns of glacier growth and shrinkage in High Mountain Asia of the last decades. Increases in snow, in part from water that comes from lowland agriculture, have probably been more important than changes in temperature to explain the growing glaciers. We now better understand changes in the crucial mountain water cycle.
Noel Fitzpatrick, Valentina Radić, and Brian Menounos
The Cryosphere, 13, 1051–1071, https://doi.org/10.5194/tc-13-1051-2019, https://doi.org/10.5194/tc-13-1051-2019, 2019
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Measurements of surface roughness are rare on glaciers, despite being an important control for heat exchange with the atmosphere and surface melt. In this study, roughness values were determined through measurements at multiple locations and seasons and found to vary across glacier surfaces and to differ from commonly assumed values in melt models. Two new methods that remotely determine roughness from digital elevation models returned good performance and may facilitate improved melt modelling.
Zhiwen Dong, Shichang Kang, Dahe Qin, Yaping Shao, Sven Ulbrich, and Xiang Qin
The Cryosphere, 12, 3877–3890, https://doi.org/10.5194/tc-12-3877-2018, https://doi.org/10.5194/tc-12-3877-2018, 2018
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This study aimed to provide a first and unique record of physicochemical properties and mixing states of LAPs at the glacier and atmosphere interface over the northeastern Tibetan Plateau to determine the individual LAPs' structure aging and mixing state changes through the atmospheric deposition process from atmosphere to glacier–snowpack surface, thereby helping to characterize the LAPs' radiative forcing and climate effects in the cryosphere region.
Cited articles
Abermann, J., Lambrecht, A., Fischer, A., and Kuhn, M.: Quantifying changes and trends in glacier area and volume in the Austrian Ötztal Alps (1969-1997-2006), The Cryosphere, 3, 205–215, https://doi.org/10.5194/tc-3-205-2009, 2009.
Aubinet, M., Vesala, T., and Papale, D. (Eds): Eddy Covariance: A Practical
Guide to Measurement and Data Analysis, Springer, Berlin, 460 pp., 2012.
Ayala, A., Pellicciotti, F., and Shea, J. M.: Modeling 2 m air temperatures
over mountain glaciers: Exploring the influence of katabatic cooling and
external warming, J. Geophys. Res.-Atmos., 120, 3139–3157,
https://doi.org/10.1002/2015JD023137, 2015.
Bahr, D. B. and Radić, V.: Significant contribution to total mass from very small glaciers, The Cryosphere, 6, 763–770, https://doi.org/10.5194/tc-6-763-2012, 2012.
Conway, J. P. and Cullen, N. J.: Cloud effects on surface energy and mass balance in the ablation area of Brewster Glacier, New Zealand, The Cryosphere, 10, 313–328, https://doi.org/10.5194/tc-10-313-2016, 2016.
Cullen, N. J. and Conway, J. P.: A 22-month record of surface meteorology
and energy balance from the ablation zone of Brewster Glacier, New Zealand,
J. Glaciol., 61, 931–946, https://doi.org/10.3189/2015JoG15J004, 2015.
Curtis, J. A., Flint, L. E., Flint, A. L., Lundquist, J. D., Hudgens, B.,
Boydston, E. E., and Young, J. K.: Incorporating Cold-Air Pooling into
Downscaled Climate Models Increases Potential Refugia for Snow-Dependent
Species within the Sierra Nevada Ecoregion, CA, PLoS ONE, 9, e106984
https://doi.org/10.1371/journal.pone.0106984, 2014.
Dadic, R., Mott, R., Lehning, M., and Burlando, P.: Wind influence on snow
depth distribution and accumulation over glaciers, J. Geophys. Res.,
115, F01012, https://doi.org/10.1029/2009JF001261, 2010.
Dadic, R., Mott, R., Lehning, M., Carenzo, M., Anderson, B., and Mackintosh,
A.: Sensitivity of turbulent fluxes to wind speed over snow surfaces in
different climatic settings, Adv. Water Resour., 55, 178–189,
https://doi.org/10.1016/j.advwatres.2012.06.010, 2013.
Daly, C., Conklin, D. R., and Unsworth, M. H.: Local atmospheric decoupling in complex topography alters climate change impacts, Int. J. Climatol., 30, 1857–1864, 2010.
Denby, B.: Second order modeling of turbulence in katabatic flows, Bound.-Lay. Meteorol., 92, 67–100, 1999.
Denby, B. and Greuell, W.: The use of bulk and profile methods for determining surface heat fluxes in the presence of glacier winds, J. Glaciol., 46, 445–452, https://doi.org/10.3189/172756500781833124, 2000.
Denby, B. and Smeets, C. J. P. P.: Derivation of turbulent flux profiles and
roughness lengths from katabatic flow dynamics, J. Atmos. Sci., 39,
1601–1612, 2000.
Escher-Vetter, H.: Zum Gletscherverhalten in den Alpen im zwanzigsten
Jahrhundert, in: Klimastatusbericht 2001, Deutscher Wetterdienst, Offenbach,
51–57, 2002.
Essery, R., Granger, R., and Pomeroy, J. W.: Boundary-layer growth and
advection of heat over snow and soil patches: Modelling and
parameterization, Hydrol. Process., 20, 953–967, https://doi.org/10.1002/hyp.6122,
2006.
Fitzpatrick, N., Radić, V., and Menounos, B.: A multi-season investigation of glacier surface roughness lengths through in situ and remote observation, The Cryosphere, 13, 1051–1071, https://doi.org/10.5194/tc-13-1051-2019, 2019.
Frei, C. and Schär, C.: A precipitation climatology of the Alps from
high-resolution rain-gauge observations, Int. J. Climatol., 18, 873–900,
https://doi.org/10.1002/(SICI)1097-0088(19980630)18:8<873::AID-JOC255>3.0.CO;2-9, 1998.
Gerber, F., Besic, N., Sharma, V., Mott, R., Daniels, M., Gabella, M., Berne, A., Germann, U., and Lehning, M.: Spatial variability in snow precipitation and accumulation in COSMO–WRF simulations and radar estimations over complex terrain, The Cryosphere, 12, 3137–3160, https://doi.org/10.5194/tc-12-3137-2018, 2018.
Grachev, A. A., Leo, L. S., Sabatino, S. D., Fernando, H. J. S., Pardyjak, E. R., and Fairall, C. W.: Structure of turbulence in katabatic flows below and
above the wind-speed maximum, Bound.-Lay. Meteorol., 159, 469–494, 2016.
Greuell, W. and Smeets, P.: Variations with elevation in the surface energy
balance on the Pasterze (Austria), J. Geophys. Res., 106, 31717–31727, https://doi.org/10.1029/2001JD900127, 2001.
Grudzielanek, A. M. and Cermak, J.: Capturing Cold-Air Flow Using Thermal
Imaging, Bound.-Lay. Meteorol., 157, 321–332, https://doi.org/10.1007/s10546-015-0042-8, 2015.
Harder, P., Pomeroy, J. W., and Helgason, W.: Local scale advection of
sensible and latent heat during snowmelt, Geophys. Res. Lett., 44,
9769–9777, https://doi.org/10.1002/2017GL074394, 2017.
Helbig, N., Mott, R., Herwijnen, A., Winstral, A., and Jonas, T.:
Parameterizing surface wind speed over complex topography, J. Geophys. Res.-Atmos., 122, 651–667, https://doi.org/10.1002/2016JD025593, 2017.
Hoinkes, H.: Methoden und Möglichkeiten von Massenhaushaltsstudien auf
Gletschern, Zeitschrift für Gletscherkunde und Glazialgeologie, 6,
37–90, 1970.
Kaser, G., Hardy, D. R., Mölg, T., Bradley, R. S., and Hyera, T. M.:
Modern glacier retreat on Kilimanjaro as evidence of climate change:
observations and facts, Int. J. Climatol., 24, 329–339,
https://doi.org/10.1002/joc.1008, 2004.
Kljun, N., Calanca, P., Rotach, M. W., and Schmid, H. P.: A simple two-dimensional parameterisation for Flux Footprint Prediction (FFP), Geosci. Model Dev., 8, 3695–3713, https://doi.org/10.5194/gmd-8-3695-2015, 2015.
Klok, E. and Oerlemans, J.: Model study of the spatial distribution of the
energy and mass balance of Morteratschgletscher, Switzerland, J. Glaciol.,
48, 505–518, https://doi.org/10.3189/172756502781831133, 2002.
Klug, C., Bollmann, E., Galos, S. P., Nicholson, L., Prinz, R., Rieg, L., Sailer, R., Stötter, J., and Kaser, G.: Geodetic reanalysis of annual glaciological mass balances (2001–2011) of Hintereisferner, Austria, The Cryosphere, 12, 833–849, https://doi.org/10.5194/tc-12-833-2018, 2018.
Kuhn, M.: The mass balance of very small glaciers, Zeitschrift für
Gletscherkunde und Glazialgeologie, 31, 171–179, 1995.
Kuhn, M., Dreiseitl, E., Hofinger, S., Markl, G., Span, N., and Kaser, G.:
Measurements and Models of the Mass Balance of Hintereisferner, Geogr. Ann. A, 81, 659–670, https://doi.org/10.1111/1468-0459.00094, 1999.
Lapo, K., Nijssen, B., and Lundquist, J. D.: Evaluation of turbulence
stability schemes of land models for stable conditions, J. Geophys. Res.-Atmos., 124, 3072–3089, https://doi.org/10.1029/2018JD028970, 2019.
MacDougall, A. H. and Flowers, G. E.: Spatial and Temporal Transferability of
a Distributed Energy-Balance Glacier Melt Model, J. Climate, 24, 1480–1498,
https://doi.org/10.1175/2010JCLI3821.1, 2011.
Marzeion, B., Jarosch, A. H., and Hofer, M.: Past and future sea-level change from the surface mass balance of glaciers, The Cryosphere, 6, 1295–1322, https://doi.org/10.5194/tc-6-1295-2012, 2012.
Mott, R., Egli, L., Grünewald, T., Dawes, N., Manes, C., Bavay, M., and Lehning, M.: Micrometeorological processes driving snow ablation in an Alpine catchment, The Cryosphere, 5, 1083–1098, https://doi.org/10.5194/tc-5-1083-2011, 2011.
Mott, R., Gromke, C., Grünewald, T., and Lehning, M.: Relative importance
of advective heat transport and boundary layer decoupling in the melt
dynamics of a patchy snow cover, Adv. Water Resour., 55, 88–97, https://doi.org/10.1016/j.advwatres.2012.03.001, 2013.
Mott, R., Daniels, M., and Lehning, M.: Atmospheric flow development and
associated changes in turbulent sensible heat flux over a patchy mountain
snow cover, J. Hydrometeorol. 16, 1315–1340, https://doi.org/10.1175/JHM-D-14-0036.1,
2015.
Mott, R., Paterna, E., Horender, S., Crivelli, P., and Lehning, M.: Wind tunnel experiments: cold-air pooling and atmospheric decoupling above a melting snow patch, The Cryosphere, 10, 445–458, https://doi.org/10.5194/tc-10-445-2016, 2016.
Mott, R., Schlögl, S., Dirks, L., and Lehning, M.: Impact of extreme
land surface heterogeneity on micrometeorology over spring snow cover, J. Hydrometeorol., 18, 2705–2722, https://doi.org/10.1175/JHM-D-17-0074.1, 2017.
Mott, R., Vionnet, V., and Grünewald, T.: The Seasonal Snow Cover
Dynamics: Review on Wind-Driven Coupling Processes, Front. Earth Sci., 6, 197, https://doi.org/10.3389/feart.2018.00197, 2018.
Mott, R., Wolf, A., Kehl, M., Kunstmann, H., Warscher, M., and Grünewald, T.: Avalanches and micrometeorology driving mass and energy balance of the lowest perennial ice field of the Alps: a case study, The Cryosphere, 13, 1247–1265, https://doi.org/10.5194/tc-13-1247-2019, 2019.
Mott, R., Stiperski, I., and Nicholson, L.: Experimental data: measurement campaign Hintereisferner Experiment, HEFEX, Data set, The Cryosphere, Zenodo, https://doi.org/10.5281/zenodo.4113867, 2020.
Mölg, T., Cullen, N. J., and Kaser, G.: Solar radiation, cloudiness and
longwave radiation over low-latitude glaciers: Implications for mass balance
modelling, J. Glaciol., 55, 292–302, 2009.
Nadeau, D. F., Pardyjak, E. R., Higgins, C. W., Huwald, H., and Parlange, M. B.: Flow during the evening transition over steep Alpine slopes, Q. J. Roy.
Meteor. Soc., 139, 607–624, https://doi.org/10.1002/qj.1985, 2013.
Nicholson, L. and Stiperski, I.: Comparison of turbulent structures and energy
fluxes over exposed and debris-covered glacier ice, J. Glaciol., 66, 543–555, https://doi.org/10.1017/jog.2020.23, 2020.
Nicholson, L. I., Prinz, R., Mölg, T., and Kaser, G.: Micrometeorological conditions and surface mass and energy fluxes on Lewis Glacier, Mt Kenya, in relation to other tropical glaciers, The Cryosphere, 7, 1205–1225, https://doi.org/10.5194/tc-7-1205-2013, 2013.
Obleitner, F.: Climatological features of glacier and valley winds at the
Hintereisferner (Ötztal Alps, Austria), Theor. Appl. Climatol., 49,
225–239, https://doi.org/10.1007/BF00867462, 1994.
Oerlemans, J.: Glaciers and Climate Change, Lisse, Balkema, 148 pp., 2001.
Oerlemans, J. and Grisogono, B.: Glacier winds and parameterisation of the
related surface heat fluxes, Tellus A, 54, 440–452,
https://doi.org/10.1034/j.1600-0870.2002.201398.x, 2002.
Oerlemans, J. and Van Den Broeke, M.: Katabatic flows over ice sheets and
glaciers, Tellus A, 54, 440–452,
https://doi.org/10.1034/j.1600-0870.2002.201398.x, 2002.
Oldroyd, H. J., Katul, G., Pardyjak, E. R., and Parlange, M. B.: Momentum
balance of katabatic flow on steep slopes covered with short vegetation,
Geophys. Res. Lett., 41, 4761–4768, https://doi.org/10.1002/2014GL060313, 2014.
Parmhed, O., Oerlemans, J., and Grisogono, B.: Describing surface fluxes in
katabatic flow on Breidamerkurjökull, Iceland, Q. J. Roy. Meteor. Soc., 130, 1137–1151, https://doi.org/10.1256/qj.03.52, 2004.
Petersen, L. and Pellicciotti, F.: Spatial and temporal variability of air
temperature on a melting glacier: Atmospheric controls, extrapolation
methods and their effect on melt modeling, Juncal Norte Glacier, Chile, J. Geophys. Res., 116, D23109, https://doi.org/10.1029/2011JD015842, 2011.
Petersen, L., Pellicciotti, F., Juszak, I., Carenzo, M., and Brock, B.:
Suitability of a constant air temperature lapse rate over an Alpine glacier:
testing the Greuell and Böhm model as an alternative, Ann. Glaciol., 54,
120–130, https://doi.org/10.3189/2013AoG63A477, 2013.
Pinto, J. O., Parsons, D. B., Brown, W. O. J., Cohn, S., Chamberlain, N.,
and Morley, B.: Coevolution of down-valley flow and the nocturnal boundary
layer in complex terrain, J. Appl. Meteorol. Clim., 45, 1429–1449, https://doi.org/10.1175/JAM2412.1, 2006.
Prinz, R., Nicholson, L. I., Mölg, T., Gurgiser, W., and Kaser, G.: Climatic controls and climate proxy potential of Lewis Glacier, Mt. Kenya, The Cryosphere, 10, 133–148, https://doi.org/10.5194/tc-10-133-2016, 2016.
Radić, V. and Hock, R.: Regionally differentiated contribution of
mountain glaciers and ice caps to future sea-level rise, Nat. Geosci., 4,
91–94, https://doi.org/10.1038/ngeo1052, 2011.
Sauter, T. and Galos, S. P.: Effects of local advection on the spatial sensible heat flux variation on a mountain glacier, The Cryosphere, 10, 2887–2905, https://doi.org/10.5194/tc-10-2887-2016, 2016.
Schlögl, S., Lehning, M., and Mott, R.: How are turbulent heat fluxes
and snow melt rates affected by a changing snow cover fraction?, Front. Earth Sci., 6, 154, https://doi.org/10.3389/feart.2018.00154, 2018a.
Schlögl, S., Lehning, M., and Mott, R.: Representation of horizontal
transport processes in snow melt modelling by applying a footprint approach,
Front. Earth Sci., 6, 120, https://doi.org/10.3389/feart.2018.00120, 2018b.
Shea, J. M. and Moore, R. D.: Prediction of spatially distributed
regional-scale fields of air temperature and vapor pressure over mountain
glaciers, J. Geophys. Res., 115, D23107, https://doi.org/10.1029/2010JD014351, 2010.
Smith, T., Smith, M., Chambers, J., Sailer, R., Nicholson, L., Mertes, J., Quincey, D. J., Carrivick, J. L., and Stiperski, I.: A scale-dependent model to represent changing aerodynamic roughness of ablating glacier ice based on repeat topographic surveys, J. Glaciol., 66, 950–964, https://doi.org/10.1017/jog.2020.56, 2020.
Sold, L., Huss, M., Hoelzle, M., Andereggen, H., Joerg, P., and Zemp, M.:
Methodological approaches to infer end-of-winter snow distribution on alpine
glaciers, J. Glaciol., 59, 1047–1059, https://doi.org/10.3189/2013JoG13J015, 2013.
Stiperski, I. and Rotach, M. W.: On the measurement of turbulence over
complex mountainous terrain, Bound.-Lay. Meteorol., 159, 97–121, 2016.
Stiperski, I., Holtslag, A. A. M., Lehner, M., Hoch, S., and Whiteman, C. D.: On the turbulence structure of deep katabatic flows on a shallow mesoscale slope, Q. J. Roy. Meteor. Soc., 146, 1206–1231, https://doi.org/10.1002/qj.3734, 2020.
Strasser, U., Corripio, J., Pellicciotti, F., Burlando, P., Brock, B., and
Funk, M.: Spatial and temporal variability of meteorological variables at
Haut Glacier d'Arolla, Switzerland, during the ablation season 2001:
measurements and simulations, J. Geophys. Res., 109, D03103, https://doi.org/10.1029/2003JD003973, 2004.
Strasser, U., Marke, T., Braun, L., Escher-Vetter, H., Juen, I., Kuhn, M., Maussion, F., Mayer, C., Nicholson, L., Niedertscheider, K., Sailer, R., Stötter, J., Weber, M., and Kaser, G.: The Rofental: a high Alpine research basin (1890–3770 m a.s.l.) in the Ötztal Alps (Austria) with over 150 years of hydrometeorological and glaciological observations, Earth Syst. Sci. Data, 10, 151–171, https://doi.org/10.5194/essd-10-151-2018, 2018.
Thomas, C. K., Kennedy, A.M., Selker, J. S., Moretti, A., Schroth, M. H., Smoot, A. R., Tufillaro, N. B., and Zeeman, M. J.: High-Resolution Fibre-Optic Temperature Sensing: A New Tool to Study the Two-Dimensional Structure of Atmospheric Surface-Layer Flow, Bound.-Lay. Meteorol., 142, 177–192, https://doi.org/10.1007/s10546-011-9672-7, 2012.
Vickers, D. and Mahrt, L.: The cospectral gap and turbulent flux calculations, J. Atmos. Ocean. Tech., 20, 660–672, https://doi.org/10.1175/1520-0426(2003)20<660:TCGATF>2.0.CO;2, 2003.
Weigel, A. P. and Rotach, M. W.: Flow structure and turbulence characteristics of the daytime atmosphere in a steep and narrow Alpine valley, Q. J. Roy. Meteor. Soc., 130, 2605–2627, https://doi.org/10.1256/qj.03.214, 2004.
Whiteman, C. D. and Doran, J. C.: The Relationship between Overlying
Synoptic-Scale Flows and Winds within a Valley, J. Appl. Meteorol., 32, 1669–1682, https://doi.org/10.1175/1520-0450(1993)032<1669:TRBOSS>2.0.CO;2, 1993.
Zhong, S. and Whiteman, C.: Downslope Flows on a Low-Angle Slope and Their
Interactions with Valley Inversions. Part II: Numerical Modeling, J. Appl. Meteorol. Clim., 47, 2039–2057, 2008.
Short summary
The Hintereisferner Experiment (HEFEX) investigated spatial and temporal dynamics of the near-surface boundary layer and associated heat exchange processes close to the glacier surface during the melting season. Turbulence data suggest that strong changes in the local thermodynamic characteristics occur when westerly flows disturbed prevailing katabatic flow, forming across-glacier flows and facilitating warm-air advection from the surrounding ice-free areas, which potentially promote ice melt.
The Hintereisferner Experiment (HEFEX) investigated spatial and temporal dynamics of the...