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  • 1
    Online Resource
    Online Resource
    Analysis of seasonal variations in mass balance and meltwater discharge of the tropical Zongo Glacier by application of a distributed energy balance model
    American Geophysical Union (AGU) ; 2011
    In:  Journal of Geophysical Research Vol. 116, No. D13 ( 2011-07-08)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 116, No. D13 ( 2011-07-08)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2010JD015105
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2011
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    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Modeling future glacier mass balance and volume changes using ERA-40 reanalysis and climate models: A sensitivity study at Storglaciären, Sweden : MODELING STORGLACIÄREN'S VOLUME EVOLUTION
    American Geophysical Union (AGU) ; 2006
    In:  Journal of Geophysical Research: Earth Surface Vol. 111, No. F3 ( 2006-09), p. n/a-n/a
    Details
    In: Journal of Geophysical Research: Earth Surface, American Geophysical Union (AGU), Vol. 111, No. F3 ( 2006-09), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2005JF000440
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2006
    detail.hit.zdb_id: 2033040-6
    detail.hit.zdb_id: 3094104-0
    detail.hit.zdb_id: 2130824-X
    detail.hit.zdb_id: 2016813-5
    detail.hit.zdb_id: 2016810-X
    detail.hit.zdb_id: 2403298-0
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 161666-3
    detail.hit.zdb_id: 161667-5
    detail.hit.zdb_id: 2969341-X
    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 3
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    Online Resource
    Radić receives Cryosphere Young Investigator Award: Citation
    American Geophysical Union (AGU) ; 2012
    In:  Eos, Transactions American Geophysical Union Vol. 93, No. 21 ( 2012-05-22), p. 206-206
    Details
    In: Eos, Transactions American Geophysical Union, American Geophysical Union (AGU), Vol. 93, No. 21 ( 2012-05-22), p. 206-206
    Abstract: Valentina Radić received the 2011 Cryosphere Young Investigator Award at the 2011 AGU Fall Meeting, held 5–9 December in San Francisco, Calif. The award is for “a significant contribution to cryospheric science and technology.”
    Type of Medium: Online Resource
    ISSN: 0096-3941 , 2324-9250
    URL: Article
    DOI: 10.1029/2012EO210010
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2012
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    SSG: 16,13
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  • 4
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    Contribution from glaciers and snow cover to runoff from mountains in different climates
    Wiley ; 2006
    In:  Hydrological Processes Vol. 20, No. 10 ( 2006-06-30), p. 2089-2090
    Details
    In: Hydrological Processes, Wiley, Vol. 20, No. 10 ( 2006-06-30), p. 2089-2090
    Type of Medium: Online Resource
    ISSN: 0885-6087 , 1099-1085
    URL: Issue
    URL: Article
    DOI: 10.1002/hyp.v20:10
    DOI: 10.1002/hyp.6206
    Language: English
    Publisher: Wiley
    Publication Date: 2006
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  • 5
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    Firn layer impact on glacial runoff: a case study at Hofsjökull, Iceland
    Wiley ; 2006
    In:  Hydrological Processes Vol. 20, No. 10 ( 2006-06-30), p. 2171-2185
    Details
    In: Hydrological Processes, Wiley, Vol. 20, No. 10 ( 2006-06-30), p. 2171-2185
    Abstract: A mass balance–runoff model is applied to Hofsjökull, an 880 km 2 ice cap in Iceland, in order to assess the importance of the firn layer for glacial runoff. The model is forced by daily temperature and precipitation data from a nearby meteorological station. Water is routed through the glacier using a linear reservoir model assuming different storage constants for firn, snow and ice. The model is calibrated and validated using mass balance data and satellite‐derived snow facies maps. Simulated mass balances and snowline retreats are generally in good agreement with observations. Modelled cumulative mass balance for the entire ice cap over the period 1987/1988 to 2003/2004 is − 7·3 m, with uninterrupted negative mass balances since 1993/1994. Perturbing the model with a uniform temperature (+1 K) and precipitation (+10%) increase yields static mass balance sensitivities of − 0·95 m a −1 and +0·23 m a −1 respectively. Removing the firn layer under otherwise likewise conditions results in almost unchanged total runoff volumes, but yields a redistribution of discharge within the year. Early summer discharge (June to mid August) is amplified by roughly 5–10%, whereas late‐summer/autumn discharge (mid August to November) is reduced by 15–20% as a result of accelerated water flow through the glacial hydrological system. In comparison, applying a climate‐model‐based temperature and precipitation scenario for Iceland until 2050 results in higher runoff throughout the year, increasing total runoff by roughly one‐third. The results emphasize the role of the firn layer in delaying water flow through glaciers, and the influence on discharge seasonality when firn areas shrink in response to climate‐change‐induced glacier wastage. Copyright © 2006 John Wiley & Sons, Ltd.
    Type of Medium: Online Resource
    ISSN: 0885-6087 , 1099-1085
    URL: Issue
    URL: Article
    DOI: 10.1002/hyp.v20:10
    DOI: 10.1002/hyp.6201
    Language: English
    Publisher: Wiley
    Publication Date: 2006
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    SSG: 14
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  • 6
    Online Resource
    Online Resource
    Comparison of Modeled Water Input and Measured Discharge Prior to a Release Event: Unteraargletscher, Bernese Alps, Switzerland
    IWA Publishing ; 2002
    In:  Hydrology Research Vol. 33, No. 1 ( 2002-02-01), p. 27-46
    Details
    In: Hydrology Research, IWA Publishing, Vol. 33, No. 1 ( 2002-02-01), p. 27-46
    Abstract: A distributed temperature index melt model including potential clear-sky solar radiation was applied to Unteraargletscher, Bernese Alps, Switzerland, to quantify water input to the glacial hydrological system during the ablation season 1999. Model parameters were determined by calibrating calculated melt with ablation measurements. Discharge was measured in the proglacial stream for 18 days until the station was destroyed by an outburst flood. Comparison of modeled melt and measured discharge reveals that routing processes of water through the glacier vary with time as the water is transferred through a dynamic drainage system. Furthermore, an imbalance of water input and output suggests that water was stored in or beneath the glacier during this period. The culminating outburst flood presumably released this en– or subglacially stored water and may be related to a change in the configuration of the glacial drainage system as inferred from measurements of subglacial water pressure.
    Type of Medium: Online Resource
    ISSN: 0029-1277 , 2224-7955
    URL: Article
    DOI: 10.2166/nh.2002.0003
    Language: English
    Publisher: IWA Publishing
    Publication Date: 2002
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    detail.hit.zdb_id: 2142091-9
    SSG: 21,3
    SSG: 14
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  • 7
    Online Resource
    Online Resource
    Tracer experiments and borehole observations in the over-deepening of Aletschgletscher, Switzerland
    International Glaciological Society ; 1999
    In:  Annals of Glaciology Vol. 28 ( 1999), p. 253-260
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 28 ( 1999), p. 253-260
    Abstract: The subglacial drainage in a pronounced overdeepening of Grosser Aletschgletscher, Switzerland was investigated by borehole water-level observations and dye-tracer injections. In August 1990 and 1991, tracer was injected at the bottom of a borehole (depth 904 m and 710 m, respectively), and simultaneously in a nearby moulin. The moulin and borehole injections identified two different flow systems coexisting within the overdeepening. The moulin injection yielded short-lived, highly peaked break-through curves with high velocities, indicating a hydraulically efficient channelized system. The borehole-tracer return occurred in broad multiple peaks characterized by a striking diurnal periodicity and, in general, correlated inversely with discharge. Water level in the borehole experienced high diurnal variations in phase with discharge at the snout indicating “closed channel flow” over large parts of the glacier. We infer that the boreholes drained subglacially and were connected to a drainage system with significant long-term storage capacity. Release of labelled water was triggered by daily water-pressure cycles.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/172756499781821742
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 1999
    detail.hit.zdb_id: 2122400-6
    SSG: 14
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  • 8
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    Quantifying parameter uncertainty in a large-scale glacier evolution model using Bayesian inference: application to High Mountain Asia
    Cambridge University Press (CUP) ; 2020
    In:  Journal of Glaciology Vol. 66, No. 256 ( 2020-04), p. 175-187
    Details
    In: Journal of Glaciology, Cambridge University Press (CUP), Vol. 66, No. 256 ( 2020-04), p. 175-187
    Abstract: The response of glaciers to climate change has major implications for sea-level change and water resources around the globe. Large-scale glacier evolution models are used to project glacier runoff and mass loss, but are constrained by limited observations, which result in models being over-parameterized. Recent systematic geodetic mass-balance observations provide an opportunity to improve the calibration of glacier evolution models. In this study, we develop a calibration scheme for a glacier evolution model using a Bayesian inverse model and geodetic mass-balance observations, which enable us to quantify model parameter uncertainty. The Bayesian model is applied to each glacier in High Mountain Asia using Markov chain Monte Carlo methods. After 10,000 steps, the chains generate a sufficient number of independent samples to estimate the properties of the model parameters from the joint posterior distribution. Their spatial distribution shows a clear orographic effect indicating the resolution of climate data is too coarse to resolve temperature and precipitation at high altitudes. Given the glacier evolution model is over-parameterized, particular attention is given to identifiability and the need for future work to integrate additional observations in order to better constrain the plausible sets of model parameters.
    Type of Medium: Online Resource
    ISSN: 0022-1430 , 1727-5652
    URL: Article
    DOI: 10.1017/jog.2019.91
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2140541-4
    SSG: 14
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  • 9
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    Range of 21st century ice mass changes in the Filchner-Ronne region of Antarctica
    Cambridge University Press (CUP) ; 2023
    In:  Journal of Glaciology
    Details
    In: Journal of Glaciology, Cambridge University Press (CUP)
    Abstract: Increases in ocean temperatures in the Filchner Ronne region of Antarctica are likely to result in increased ice mass loss and sea level rise. We constrain projections of the 21st century sea level contribution of this region using process-based ice-sheet modeling, with model parameters controlling ice dynamics calibrated using observed surface speeds and Markov-chain Monte Carlo sampling. We use climate forcing from Representative Concentration Pathway (RCP) scenarios as well as a set of hypothetical scenarios of deep ocean warming to evaluate the sensitivity of this region to ocean temperatures. Projected changes in regional ice mass correspond to a decrease in global mean sea level of 24±7 mm over 2015–2100 under RCP 2.6 and 28±9 mm under RCP 8.5. Increased regional inland surface accumulation related to higher warming levels in RCP 8.5 leads to more ice above flotation, offsetting increased ice shelf basal melt. The tests involving step changes in ocean temperatures with constant surface forcing show that one degree of ocean warming from present results in an additional +11 mm contribution to sea level by 2100 and 1% of the ice-covered area in the domain becomes ungrounded (23 200 km 2 ). The rate of mass loss with temperature increases at higher temperatures.
    Type of Medium: Online Resource
    ISSN: 0022-1430 , 1727-5652
    URL: Article
    DOI: 10.1017/jog.2023.10
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2023
    detail.hit.zdb_id: 2140541-4
    SSG: 14
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  • 10
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    Volume–area scaling vs flowline modelling in glacier volume projections
    International Glaciological Society ; 2007
    In:  Annals of Glaciology Vol. 46 ( 2007), p. 234-240
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 46 ( 2007), p. 234-240
    Abstract: Volume–area scaling provides a practical alternative to ice-flow modelling to account for glacier size changes when modelling the future evolution of glaciers; however, uncertainties remain as to the validity of this approach under non-steady conditions. We address these uncertainties by deriving scaling exponents in the volume–area relationship from one-dimensional ice-flow modelling. We generate a set of 37 synthetic steady-state glaciers of different sizes, and then model their volume evolution due to climate warming and cooling as prescribed by negative and positive mass-balance perturbations, respectively, on a century timescale. The scaling exponent derived for the steady-state glaciers ( γ = 1.56) differs from the exponents derived for the glaciers in transient (non-steady) state by up to 86%. Nevertheless, volume projections employing volume–area scaling are relatively insensitive to these differences in scaling exponents. Volume–area scaling agrees well with the results from ice-flow modelling. In addition, the scaling method is able to simulate the approach of a glacier to a new steady state, if mass-balance elevation feedback is approximated by removing or adding elevation bands at the lowest part of the glacier as the glacier retreats or advances. If area changes are approximated in the mass-balance computations in this way, our results indicate that volume–area scaling is a powerful tool for glacier volume projections on multi-century timescales.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/172756407782871288
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2007
    detail.hit.zdb_id: 2122400-6
    SSG: 14
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