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  • 1
    Online Resource
    Online Resource
    Ice sheet action versus reaction: Distinguishing between Heinrich events and Dansgaard-Oeschger cycles in the North Atlantic : MILLENNIAL-SCALE IRD VARIABILITY
    American Geophysical Union (AGU) ; 2006
    In:  Paleoceanography Vol. 21, No. 2 ( 2006-06), p. n/a-n/a
    Details
    In: Paleoceanography, American Geophysical Union (AGU), Vol. 21, No. 2 ( 2006-06), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0883-8305
    URL: Article
    DOI: 10.1029/2005PA001247
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2006
    detail.hit.zdb_id: 637876-6
    detail.hit.zdb_id: 2916554-4
    SSG: 16,13
    SSG: 13
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  • 2
    Online Resource
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    Response timescales for martian ice masses and implications for ice flow on Mars
    Elsevier BV ; 2013
    In:  Icarus Vol. 225, No. 2 ( 2013-8), p. 949-959
    Details
    In: Icarus, Elsevier BV, Vol. 225, No. 2 ( 2013-8), p. 949-959
    Type of Medium: Online Resource
    ISSN: 0019-1035
    URL: Article
    DOI: 10.1016/j.icarus.2012.09.031
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2013
    detail.hit.zdb_id: 1467991-7
    SSG: 16,12
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  • 3
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    Holocene thinning of Darwin and Hatherton glaciers, Antarctica, and implications for grounding-line retreat in the Ross Sea
    Copernicus GmbH ; 2021
    In:  The Cryosphere Vol. 15, No. 7 ( 2021-07-20), p. 3329-3354
    Details
    In: The Cryosphere, Copernicus GmbH, Vol. 15, No. 7 ( 2021-07-20), p. 3329-3354
    Abstract: Abstract. Chronologies of glacier deposits in the Transantarctic Mountains provide important constraints on grounding-line retreat during the last deglaciation in the Ross Sea. However, between Beardmore Glacier and Ross Island – a distance of some 600 km – the existing chronologies are generally sparse and far from the modern grounding line, leaving the past dynamics of this vast region largely unconstrained. We present exposure ages of glacial deposits at three locations alongside the Darwin–Hatherton Glacier System – including within 10 km of the modern grounding line – that record several hundred meters of Late Pleistocene to Early Holocene thickening relative to present. As the ice sheet grounding line in the Ross Sea retreated, Hatherton Glacier thinned steadily from about 9 until about 3 ka. Our data are equivocal about the maximum thickness and Mid-Holocene to Early Holocene history at the mouth of Darwin Glacier, allowing for two conflicting deglaciation scenarios: (1) ∼500 m of thinning from 9 to 3 ka, similar to Hatherton Glacier, or (2) ∼950 m of thinning, with a rapid pulse of ∼600 m thinning at around 5 ka. We test these two scenarios using a 1.5-dimensional flowband model, forced by ice thickness changes at the mouth of Darwin Glacier and evaluated by fit to the chronology of deposits at Hatherton Glacier. The constraints from Hatherton Glacier are consistent with the interpretation that the mouth of Darwin Glacier thinned steadily by ∼500 m from 9 to 3 ka. Rapid pulses of thinning at the mouth of Darwin Glacier are ruled out by the data at Hatherton Glacier. This contrasts with some of the available records from the mouths of other outlet glaciers in the Transantarctic Mountains, many of which thinned by hundreds of meters over roughly a 1000-year period in the Early Holocene. The deglaciation histories of Darwin and Hatherton glaciers are best matched by a steady decrease in catchment area through the Holocene, suggesting that Byrd and/or Mulock glaciers may have captured roughly half of the catchment area of Darwin and Hatherton glaciers during the last deglaciation. An ensemble of three-dimensional ice sheet model simulations suggest that Darwin and Hatherton glaciers are strongly buttressed by convergent flow with ice from neighboring Byrd and Mulock glaciers, and by lateral drag past Minna Bluff, which could have led to a pattern of retreat distinct from other glaciers throughout the Transantarctic Mountains.
    Type of Medium: Online Resource
    ISSN: 1994-0424
    URL: Article
    URL: Article
    DOI: 10.5194/tc-15-3329-2021
    DOI: 10.5194/tc-15-3329-2021-supplement
    Language: English
    Publisher: Copernicus GmbH
    Publication Date: 2021
    detail.hit.zdb_id: 2393169-3
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  • 4
    Online Resource
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    Reconstruction of Temperature, Accumulation Rate, and Layer Thinning From an Ice Core at South Pole, Using a Statistical Inverse Method
    American Geophysical Union (AGU) ; 2021
    In:  Journal of Geophysical Research: Atmospheres Vol. 126, No. 13 ( 2021-07-16)
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 126, No. 13 ( 2021-07-16)
    Abstract: An inverse method using a firn model with isotope diffusion provides self‐consistent temperature, accumulation rate, and thinning histories Glacial‐interglacial temperature change at the South Pole was 6.7 ± 1.0 K. The δ 18 O/T sensitivity is 0.99 ± 0.03 permille/K Reconstruction of ice thinning shows millennial‐scale variations in thinning function and decreased thinning at depth compared to 1‐D model
    Type of Medium: Online Resource
    ISSN: 2169-897X , 2169-8996
    URL: Article
    DOI: 10.1029/2020JD033300
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2021
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016800-7
    detail.hit.zdb_id: 2969341-X
    SSG: 16,13
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  • 5
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    Well-posed boundary conditions for limited-domain models of transient ice flow near an ice divide
    International Glaciological Society ; 2012
    In:  Journal of Glaciology Vol. 58, No. 211 ( 2012), p. 1008-1020
    Details
    In: Journal of Glaciology, International Glaciological Society, Vol. 58, No. 211 ( 2012), p. 1008-1020
    Abstract: When an ice-flow model is constrained by data that exist over only a section of an ice sheet, it is computationally advantageous to limit the model domain to only that section. For example, a limited domain near an ice-core site might cross an ice divide, and have no termini. Accurately calculating ice-sheet evolution in response to spatial and temporal variations in climate and ice flow depends on accurately calculating the transient ice flux crossing the limited-domain boundaries. In the absence of information from outside the limited domain, this is an ill-posed problem. Boundary conditions based only on information from inside the limited domain can produce ice-sheet evolution incompatible with the full ice sheet within which we suppose it to exist. We use impulse-response functions to provide boundary values that are informed by the external ice sheet, without conventionally 'nesting' the limited domain in a full ice-sheet model. Evolution within a limited domain can then be consistent with evolution of boundary conditions is designed for future use in affected the limited domain can be inferred from the full ice sheet. Our treatment of limited-domain an inverse problem in which external changes that data from within the limited domain.
    Type of Medium: Online Resource
    ISSN: 0022-1430 , 1727-5652
    URL: Article
    DOI: 10.3189/2012JoG11J212
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2012
    detail.hit.zdb_id: 2140541-4
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  • 6
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    Ketone supplementation protects against seizures caused by hyperbaric oxygen
    Wiley ; 2019
    In:  Physiological Reports Vol. 7, No. 1 ( 2019-01)
    Details
    In: Physiological Reports, Wiley, Vol. 7, No. 1 ( 2019-01)
    Type of Medium: Online Resource
    ISSN: 2051-817X , 2051-817X
    URL: Article
    URL: Article
    DOI: 10.14814/phy2.13961
    DOI: 10.21203/rs.2.15031/v1
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2724325-4
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  • 7
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    Differences in the transient responses of individual glaciers: a case study of the Cascade Mountains of Washington State, USA
    Cambridge University Press (CUP) ; 2022
    In:  Journal of Glaciology Vol. 68, No. 270 ( 2022-08), p. 751-763
    Details
    In: Journal of Glaciology, Cambridge University Press (CUP), Vol. 68, No. 270 ( 2022-08), p. 751-763
    Abstract: Mountain glaciers have response times that govern retreat due to anthropogenic climate change. We use geometric attributes to estimate individual response times for 383 glaciers in the Cascade mountain range of Washington State, USA. Approximately 90% of estimated response times are between 10 and 60 years, with many large glaciers on the short end of this distribution. A simple model of glacier dynamics shows that this range of response times entails consequential differences in recent and ongoing glacier changes: glaciers with decadal response times have nearly kept pace with anthropogenic warming, but those with multi-decadal response times are far from equilibrium, and their additional committed retreat stands well beyond natural variability. These differences have implications for changes in glacier runoff. A simple calculation highlights that transient peaks in area-integrated melt, either at the onset of forcing or due to variations in forcing, depend on the glacier's response time and degree of disequilibrium. We conclude that differences in individual response times should be considered when assessing the state of a population of glaciers and modeling their future response. These differences in response can arise simply from a range of different glacier geometries, and the same basic principles can be expected in other regions as well.
    Type of Medium: Online Resource
    ISSN: 0022-1430 , 1727-5652
    URL: Article
    DOI: 10.1017/jog.2021.133
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2022
    detail.hit.zdb_id: 2140541-4
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  • 8
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    Millennially averaged accumulation rates for the Vostok Subglacial Lake region inferred from deep internal layers
    International Glaciological Society ; 2009
    In:  Annals of Glaciology Vol. 50, No. 51 ( 2009), p. 25-34
    Details
    In: Annals of Glaciology, International Glaciological Society, Vol. 50, No. 51 ( 2009), p. 25-34
    Abstract: Accumulation rates and their spatio-temporal variability are important boundary conditions for ice-flow models. The depths of radar-detected internal layers can be used to infer the spatial variability of accumulation rates. Here we infer accumulation rates from three radar layers (26, 35 and 41 ka old) in the Vostok Subglacial Lake region using two methods: (1) the local-layer approximation (LLA) and (2) a combination of steady-state flowband modeling and formal inverse methods. The LLA assumes that the strain-rate history of a particle traveling through the ice sheet can be approximated by the vertical strain-rate profile at the current position of the particle, which we further assume is uniform. The flowband model, however, can account for upstream strain-rate gradients. We use the LLA to map accumulation rates over a 150 km × 350 km area, and we apply the flowband model along four flowbands. The LLA accumulation-rate map shows higher values in the northwestern corner of our study area and lower values near the downstream shoreline of the lake. These features are also present but less distinct in the flowband accumulation-rate profiles. The LLA-inferred accumulation-rate patterns over the three time periods are all similar, suggesting that the regional pattern did not change significantly between the start of the Holocene and the last ~20 ka of the last Glacial Period. However, the accumulation-rate profiles inferred from the flowband model suggest changes during that period of up to 1 cma –1 or ~50% of the inferred values.
    Type of Medium: Online Resource
    ISSN: 0260-3055 , 1727-5644
    URL: Article
    DOI: 10.3189/172756409789097441
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2009
    detail.hit.zdb_id: 2122400-6
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  • 9
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    Formulating an inverse problem to infer the accumulation-rate pattern from deep internal layering in an ice sheet using a Monte Carlo approach
    International Glaciological Society ; 2010
    In:  Journal of Glaciology Vol. 56, No. 196 ( 2010), p. 318-332
    Details
    In: Journal of Glaciology, International Glaciological Society, Vol. 56, No. 196 ( 2010), p. 318-332
    Abstract: Using a Monte Carlo (MC) method, we determine the accumulation-rate profile along a flowband, the influx of ice into the upstream end of the flowband and the age of an internal layer. The data comprise the depth profile of the internal layer, a few velocity measurements at the surface and the average accumulation at one location. The data in our example were collected at Taylor Mouth, a flank site off Taylor Dome, Antarctica. We present three alternative formulations of this inverse problem. Depending on the formulation used, this particular inverse problem can have up to four solutions, each corresponding to a different spatial accumulation-rate pattern. This study demonstrates the ability of a MC method to find several solutions to this inverse problem, and how to use a Metropolis algorithm to determine the probability distribution of each of these different solutions. The only disadvantage of the MC method is that it is computationally more expensive than other inverse methods, such as the Gradient method.
    Type of Medium: Online Resource
    ISSN: 0022-1430 , 1727-5652
    URL: Article
    DOI: 10.3189/002214310791968476
    Language: English
    Publisher: International Glaciological Society
    Publication Date: 2010
    detail.hit.zdb_id: 2140541-4
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  • 10
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    Contextualizing lobate debris aprons and glacier-like forms on Mars with debris-covered glaciers on Earth
    SAGE Publications ; 2021
    In:  Progress in Physical Geography: Earth and Environment Vol. 45, No. 2 ( 2021-04), p. 130-186
    Details
    In: Progress in Physical Geography: Earth and Environment, SAGE Publications, Vol. 45, No. 2 ( 2021-04), p. 130-186
    Abstract: Debris-covered glaciers from around the world offer distinct environmental, climatic, and historical conditions from which to study the effects of debris on glacier-ice evolution. A rich literature on debris-covered glaciers exists from decades of field work, laboratory studies, remote-sensing observations, and numerical modeling. In general, the base of knowledge established by studying periglacial, glacial, and paraglacial landforms on Earth has been applied to aid interpretation of ice-rich or ice-remnant landforms on Mars, but research has progressed on both planets. For Mars, the spatial distribution of lobate debris aprons and glacier-like forms, in particular, is critical to constraining past climate conditions when such features were active, reconstructing past ice extent, and estimating the total inventory of buried ice remaining in the mid-latitudes of Mars. This review spans a range of knowledge about debris-covered glaciers on Earth, in order to add context to investigations of dust and debris-covered ice on Mars and to put research on both planets in a perspective aimed at maximizing process-based understanding of glacier evolution. The state of knowledge and some gaps in knowledge on Mars are discussed in relation to possible avenues for future research in how landforms are classified, advances in comparative planetology, and new understanding from future missions. While this review is focused primarily on processes controlling active debris-covered glaciers, a key to understanding glacier change through time is to consider individual landforms in context with the full-system environment in which they are found. For Earth, this includes understanding local and regional controls on current glacier change, and how these processes relate to landform development in the past as well as what may develop in the future. For Mars, this includes evaluating how present-day landforms elucidate past ice activity and environmental conditions during epochs when orbital parameters, climate, and water ice distribution were substantially different.
    Type of Medium: Online Resource
    ISSN: 0309-1333 , 1477-0296
    URL: Article
    DOI: 10.1177/0309133320986902
    RVK:
    RA 1000
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2021
    detail.hit.zdb_id: 2006623-5
    SSG: 14
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