scholarly journals Modelling Alpine glacier geometry and subglacial erosion patterns in response to contrasting climatic forcing

2021 ◽  
Author(s):  
Fabio Magrani ◽  
Pierre G. Valla ◽  
David Egholm
Keyword(s):  
Climatic Forcing ◽  
Alpine Glacier

scholarly journals Comment on "100-year mass changes in the Swiss Alps linked to the Atlantic Multidecadal Oscillation" by Matthias Huss et al. (2010)

2010 ◽  
Vol 4 (4) ◽  
pp. 2475-2481 ◽  
Author(s):  
P. W. Leclercq ◽  
R. S. W. van de Wal ◽  
J. Oerlemans
Keyword(s):  
Mass Balance ◽  
Atlantic Multidecadal Oscillation ◽  
Swiss Alps ◽  
Past Century ◽  
Climate Variations ◽  
Specific Mass ◽  
Climatic Forcing ◽  
Climatic Fluctuations ◽  
Alpine Glacier ◽  
Climatic Oscillations

Abstract. The paper by Huss et al. (2010) presents a comprehensive set of 100-year specific mass balance series for 30 Swiss glaciers. In the second part of the paper, the authors relate the fluctuations in alpine glacier specific mass balance to climatic changes attributed to the Atlantic Multidecadal Oscillation (AMO). We believe that the specific mass balance is not the appropriate measure to interpret climatic fluctuations. Due to the dynamic response of glaciers to changes in their climatic forcing, the importance of short-term climatic oscillations is overestimated. Taking the changes in glacier geometry into account, the AMO related climate variations are far less important to the recent mass loss than the trend caused by the gradual warming over the past century.

Interaction between water pressure in the basal drainage system and discharge from an Alpine glacier before and during a rainfall-induced subglacial hydrological event

1997 ◽  
Vol 24 ◽  
pp. 288-292 ◽  
Author(s):  
Andrew P. Barrett ◽  
David N. Collins
Keyword(s):  
Water Level ◽  
Water Pressure ◽  
Drainage System ◽  
Water Levels ◽  
Drainage Network ◽  
Alpine Glacier ◽  
Hydraulic Conditions ◽  
Borehole Water ◽  
Progressive Growth ◽  
Resultant Increase

Combined measurements of meltwater discharge from the portal and of water level in a borehole drilled to the bed of Findelengletscher, Switzerland, were obtained during the later part of the 1993 ablation season. A severe storm, lasting from 22 through 24 September, produced at least 130 mm of precipitation over the glacier, largely as rain. The combined hydrological records indicate periods during which the basal drainage system became constricted and water storage in the glacier increased, as well as phases of channel growth. During the storm, water pressure generally increased as water backed up in the drainage network. Abrupt, temporary falls in borehole water level were accompanied by pulses in portal discharge. On 24 September, whilst borehole water level continued to rise, water started to escape under pressure with a resultant increase in discharge. As the drainage network expanded, a large amount of debris was flushed from a wide area of the bed. Progressive growth in channel capacity as discharge increased enabled stored water to drain and borehole water level to fall rapidly. Possible relationships between observed borehole water levels and water pressures in subglacial channels are influenced by hydraulic conditions at the base of the hole, distance between the hole and a channel, and the nature of the substrate.

ALPINE GLACIER ADVANCE DURING MIS 11 IN THE MCMURDO DRY VALLEYS, ANTARCTICA

2016 ◽  
Author(s):  
Kate M. Swanger ◽  
◽  
Joerg M. Schaefer ◽  
Gisela Winckler
Keyword(s):  
Mcmurdo Dry Valleys ◽  
Dry Valleys ◽  
Alpine Glacier ◽  
Glacier Advance

HIGH-RESOLUTION AGE CONTROL FOR THE LATE PALEOZOIC ICE AGE SUCCESSIONS ACROSS SW AND SC GONDWANA ­­­­­­­­­­– IMPLICATIONS FOR CLIMATIC FORCING FOR THE END OF THE LPIA

2018 ◽  
Author(s):  
Neil Griffis ◽  
◽  
Roland Mundil ◽  
Roland Mundil ◽  
Isabel P. Montañez ◽  
...  
Keyword(s):  
High Resolution ◽  
Ice Age ◽  
Late Paleozoic ◽  
Climatic Forcing ◽  
Late Paleozoic Ice Age

scholarly journals Strong regional influence of climatic forcing datasets on global crop model ensembles

2021 ◽  
Vol 300 ◽  
pp. 108313
Author(s):  
Alex C. Ruane ◽  
Meridel Phillips ◽  
Christoph Müller ◽  
Joshua Elliott ◽  
Jonas Jägermeyr ◽  
...  
Keyword(s):  
Crop Model ◽  
Climatic Forcing ◽  
Regional Influence ◽  
Model Ensembles

scholarly journals Short term variations of tracer transit speed on alpine glaciers

2010 ◽  
Vol 4 (3) ◽  
pp. 381-396 ◽  
Author(s):  
M. A. Werder ◽  
T. V. Schuler ◽  
M. Funk
Keyword(s):  
Drainage System ◽  
Relative Importance ◽  
Short Term ◽  
Diurnal Variability ◽  
Alpine Glacier ◽  
Two Component ◽  
Transit Speed ◽  
Underlying Processes ◽  
Diurnal Maximum ◽  
Tracer Experiments

Abstract. We first present the results of a series of tracer experiments conducted on an alpine glacier (Gornergletscher, Switzerland) over a diurnal discharge cycle. For these injections, a moulin was used into which an ice marginal lake was draining, providing a relatively constant discharge. The measured tracer transit speeds show two diurnal maxima and minima. These findings are qualitatively different to existing observations from two series of injections conducted at Unteraargletscher (Switzerland) using a moulin fed by supraglacial meltwater having a high diurnal variability, which displayed one diurnal maximum and minimum. We then develop and use a simple two-component model of the glacier drainage system, comprising a moulin and a channel element, to simulate the measured transit speeds for all three injection series. The model successfully reproduces all the observations and shows that the same underlying processes can produce the qualitatively different behaviour depending on the different moulin input discharge regimes. Using the model, we assess the relative importance of the different measurement quantities, show that frequent measurements of moulin input discharge are indispensable and propose an experiment design to monitor the development of the drainage system over several weeks.

Millennial scale variability of denudation rates for the last 15 kyr inferred from the detrital 10Be record of Lake Stappitz in the Hohe Tauern massif, Austrian Alps

The Holocene ◽  
2017 ◽  
Vol 27 (12) ◽  
pp. 1914-1927 ◽  
Author(s):  
Reto Grischott ◽  
Florian Kober ◽  
Maarten Lupker ◽  
Juergen M Reitner ◽  
Ruth Drescher-Schneider ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Anthropogenic Impacts ◽  
Sediment Cores ◽  
Tight Coupling ◽  
Climatic Forcing ◽  
Erosion Rates ◽  
Austrian Alps ◽  
Denudation Rates ◽  
Time Period ◽  
Flooding Events

Reconstructing paleo-denudation rates over Holocene timescales in an Alpine catchment provides a unique opportunity to isolate the climatic forcing of denudation from other tectonic or anthropogenic effects. Cosmogenic 10Be on two sediment cores from Lake Stappitz (Austrian Alps) were measured yielding a 15-kyr-long catchment-averaged denudation record of the upstream Seebach Valley. The persistence of a lake at the outlet of the valley fixed the baselevel, and the high mean elevation minimizes anthropogenic impacts. The 10Be record indicates a decrease in the proportion of paraglacial sediments from 15 to 7 kyr cal. BP after which the 10Be concentrations are considered to reflect hillslope erosion and thus can be converted to denudation rates. These ones significantly fluctuated over this time period: lower hillslope erosion rates of ca. 0.4 mm/year dated between 5 and 7 kyr cal. BP correlate with a stable climate, sparse flooding events and elevated temperatures that favoured the widespread growth of stabilizing soils and vegetation. Higher hillslope erosion rates of ca. 0.8 mm/year over the last ~4 kyr correlate with a variable, cooler climate where frequent flooding events enhance denudation of less protected hillslopes. Overall, our results suggest a tight coupling of climate and hillslope erosion in alpine landscapes as it has been observed in other parts of the Alps.

scholarly journals Coherent-stable scatterers detection in SAR multi-interferograms: Feature fuzzy fusion in Alpine glacier geophysical context

2007 ◽  
Author(s):  
G. Vasile ◽  
E. Trouve ◽  
L. Valet ◽  
J.-M. Nicolas ◽  
L. Bombrun ◽  
...  
Keyword(s):  
Alpine Glacier ◽  
Fuzzy Fusion

The fluctuations of italian glaciers during the last century: a contribution to knowledge about alpine glacier changes

2007 ◽  
Vol 89 (3) ◽  
pp. 167-184 ◽  
Author(s):  
Michele Citterio ◽  
Guglielmina Diolaiuti ◽  
Claudio Smiraglia ◽  
Carlo D'agata ◽  
Teresa Carnielli ◽  
...  
Keyword(s):  
Alpine Glacier ◽  
Glacier Changes

Groundwater circulation in a closed desert basin: Topographic scaling and climatic forcing

1988 ◽  
Vol 24 (10) ◽  
pp. 1675-1688 ◽  
Author(s):  
Christopher J. Duffy ◽  
Sumani Al-Hassan
Keyword(s):  
Climatic Forcing ◽  
Groundwater Circulation
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