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  • 1
    Electronic Resource
    Electronic Resource
    Barium-selective electrodes based on neutral carriers and their use in the titration of sulfate in combustion products (1985)
    s.l. : American Chemical Society
    Analytical chemistry 57 (1985), S. 2756-2758 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00291a005
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Neutrale Ionophore mit Selektivität für Na⊕ (1983)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 2028-2034 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Neutral Ionophores with Selectivity for Na⊕New non-macrocyclic, electrically neutral ionophores 5-9 are described. In membranes they induce selectivities of Na⊕ over K⊕ by a factor of up to 20.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19831160529
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Neue neutrale Ionophore mit hoher Selektivität für Ba2+ (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 1071-1077 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: New Neutral Ionophores with High Ba2+ SelectivityThe syntheses and the selectivity coefficients of the new open-chained, electrically neutral ionophores 2-4 are reported. Their lipophilicities and their selectivities in membranes with respect to Ba2+ ions were optimized: 2c and - to a smaller extent - 4 exhibit a remarkable combination of high Ba2+ selectivity and high lipophilicity and are, therefore, attractive for analytical applications.
    Notes: Synthesen und Selektivitätskoeffizienten der neuen offenkettigen, elektrisch neutralen Ionophore 2-4 werden mitgeteilt. Ihre Lipophilien und Selektivitäten für Ba2+ -Ionen in Membranen wurden optimiert: 2c und - weniger ausgeprägt - 4 zeigen eine bemerkenswerte Kombination von hoher Ba2+ -Selektivität und hoher Lipophilie und sind daher für analytische Anwendungszwecke attraktiv.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180324
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    Paper (German National Licenses)
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  • 4
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    Numerical simulations of major ice streams in western Dronning Maud Land, Antarctica, under wet and dry basal conditions (2014)
    Cambridge University Press
    Details
    Publication Date: 2014-06-11
    Print ISSN: 0022-1430
    Electronic ISSN: 1727-5652
    Topics: Geography , Geosciences
    Published by Cambridge University Press on behalf of The International Glaciological Society (IGS).
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  • 5
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    Simulation of the future sea level contribution of Greenland with a new glacial system model (2018)
    COPERNICUS GESELLSCHAFT MBH
    In:  EPIC3The Cryosphere, COPERNICUS GESELLSCHAFT MBH, 12(10), pp. 3097-3121, ISSN: 1994-0424
    Details
    Publication Date: 2019-02-04
    Description: We introduce the coupled model of the Green- land glacial system IGLOO 1.0, including the polythermal ice sheet model SICOPOLIS (version 3.3) with hybrid dy- namics, the model of basal hydrology HYDRO and a param- eterization of submarine melt for marine-terminated outlet glaciers. The aim of this glacial system model is to gain a better understanding of the processes important for the future contribution of the Greenland ice sheet to sea level rise under future climate change scenarios. The ice sheet is initialized via a relaxation towards observed surface elevation, impos- ing the palaeo-surface temperature over the last glacial cycle. As a present-day reference, we use the 1961–1990 standard climatology derived from simulations of the regional atmo- sphere model MAR with ERA reanalysis boundary condi- tions. For the palaeo-part of the spin-up, we add the temper- ature anomaly derived from the GRIP ice core to the years 1961–1990 average surface temperature field. For our pro- jections, we apply surface temperature and surface mass bal- ance anomalies derived from RCP 4.5 and RCP 8.5 scenar- ios created by MAR with boundary conditions from simula- tions with three CMIP5 models. The hybrid ice sheet model is fully coupled with the model of basal hydrology. With this model and the MAR scenarios, we perform simulations to estimate the contribution of the Greenland ice sheet to future sea level rise until the end of the 21st and 23rd centuries. Fur- ther on, the impact of elevation–surface mass balance feed- back, introduced via the MAR data, on future sea level rise is inspected. In our projections, we found the Greenland ice sheet to contribute between 1.9 and 13.0 cm to global sea level rise until the year 2100 and between 3.5 and 76.4 cm until the year 2300, including our simulated additional sea level rise due to elevation–surface mass balance feedback. Translated into additional sea level rise, the strength of this feedback in the year 2100 varies from 0.4 to 1.7 cm, and in the year 2300 it ranges from 1.7 to 21.8 cm. Additionally, taking the Helheim and Store glaciers as examples, we inves- tigate the role of ocean warming and surface runoff change for the melting of outlet glaciers. It shows that ocean temper- ature and subglacial discharge are about equally important for the melting of the examined outlet glaciers.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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  • 6
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    The mechanisms behind Jakobshavn Isbræ’s acceleration and mass loss: A 3-D thermomechanical model study (2017)
    Wiley
    In:  EPIC3Geophysical Research Letters, Wiley, 44, pp. 6252-6260, ISSN: 0094-8276
    Details
    Publication Date: 2017-09-18
    Description: The mechanisms causing widespread flow acceleration of Jakobshavn Isbræ, West Greenland, remain unclear despite an abundance of observations and modeling studies. Here we simulate the glacier's evolution from 1985 to 2016 using a three-dimensional thermomechanical ice flow model. The model captures the timing and 90% of the observed changes by forcing the calving front. Basal drag in the trough is low, and lateral drag balances the ice stream's driving stress. The calving front position is the dominant control on changes of Jakobshavn Isbræ since the ice viscosity in the shear margins instantaneously drops in response to the stress perturbation caused by calving front retreat, which allows for widespread flow acceleration. Gradual shear margin warming contributes 5 to 10% to the total acceleration. Our simulations suggest that the glacier will contribute to eustatic sea level rise at a rate comparable to or higher than at present.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 7
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    Oldest Ice in Antarctica – the 3d continental ice sheet modelling perspective. (2018)
    In:  EPIC3EGU General Assembly, Vienna, 2018-04-08-2018-04-13
    Details
    Publication Date: 2019-08-21
    Description: The ongoing quest to find the oldest continuous ice core in Antarctica draws on the expertise of multiple disciplines. Here we present our efforts to inform on the location of potential future drilling sites by 3d continental ice sheet modelling. We present the results of an ensemble of ice sheet model simulations spanning the last 2 million years utilizing a variety of different model setups and boundary conditions including new radar derived bedrock elevation. In our analysis we focus on the physical properties and ice dynamics around the major drill sites such as Dome Fuji and Dome C and discuss the effects of the ice sheets history on the present day flow regime. By using a continental setup and applying a transient forcing created from paleo climate modelling studies and ice core data we are able to take a holistic view of Antarctic Ice Sheet dynamics and its impact on the vertical stratigraphy around the East Antarctic ice domes.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
    Format: application/pdf
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  • 8
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    Basal roughness of the East Antarctic Ice Sheet and indications for its basal thermal state (2019)
    In:  EPIC3IGS Symposium Five Decades of Radioglaciology, Stanford, California, USA, 2019-07-08-2019-07-12
    Details
    Publication Date: 2019-08-12
    Description: Basal motion of ice sheets represents a large uncertainty in ice-flow models, as it dependends on the roughness and material of the subglacial bed and the occurrence of water. It is the part of the total flow speed that can change most rapidly and can therefore facilitate rapid variations in the dynamic behaviour of ice sheets. In this study we investigate the subglacial properties of the East Antarctic Ice Sheet by statistically analyzing the roughness of the bed topography, which is inferred from radio-echo sounding measurements. The roughness analysis with two roughness parameters enables a classification of the subglacial landscapes below the ice sheet. The roughness parameters are correlated with the flow speed of the ice and modeled basal temperatures. The observed relationships lead to the conclusion that one of the roughness parameters might indicate the thermal condition at the base of the ice sheet. If confirmed by further studies, this could be used as an additional method for predicting the basal thermal regime.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 9
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    Age stratigraphy in the East Antarctic Ice Sheet inferred from radio-echo sounding horizons (2019)
    In:  EPIC3Earth System Science Data, 11(3), pp. 1069-1081, ISSN: 1866-3516
    Details
    Publication Date: 2021-01-27
    Description: The East Antarctic Ice Sheet contains a wealth of information that can be extracted from its internal architecture such as distribution of age, past flow features, and surface and basal properties. Airborne radar surveys can sample this stratigraphic archive across broad areas. Here, we identify and trace key horizons across several radar surveys to obtain the stratigraphic information. We transfer the age–depth scales from ice cores to intersecting radar data. We then propagate these age scales across the ice sheet using the high fidelity continuity of the radar horizons. In Dronning Maud Land, including Dome Fuji, we mapped isochrones with ages of 38 and 74 ka. In the central region of East Antarctica around Dome Concordia, Vostok and Dome Argus, we use isochrone ages of 38, 48, 90 and 161 ka. Taking together both regions, we provide isochrone depths traced along a combined profile length of more than 40 000 km and discuss uncertainties of the obtained stratigraphy, as well as factors important to consider for further expansion. This data set is the most extensive distribution of internal horizons in East Antarctica to date. The isochrone depths presented in this study are available on PANGAEA (https://doi.org/10.1594/PANGAEA.895528; Winter et al., 2018).
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
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  • 10
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    Modelling the Antarctic Ice Sheet across the mid-Pleistocene transition – implications for Oldest Ice (2019)
    In:  EPIC3The Cryosphere, 13(7), pp. 2023-2041, ISSN: 1994-0424
    Details
    Publication Date: 2019-08-19
    Description: The international endeavour to retrieve a continuous ice core, which spans the middle Pleistocene climate transition ca. 1.2–0.9 Myr ago, encompasses a multitude of field and model-based pre-site surveys. We expand on the current efforts to locate a suitable drilling site for the oldest Antarctic ice core by means of 3-D continental ice-sheet modelling. To this end, we present an ensemble of ice-sheet simulations spanning the last 2 Myr, employing transient boundary conditions derived from climate modelling and climate proxy records. We discuss the imprint of changing climate conditions, sea level and geothermal heat flux on the ice thickness, and basal conditions around previously identified sites with continuous records of old ice. Our modelling results show a range of configurational ice-sheet changes across the middle Pleistocene transition, suggesting a potential shift of the West Antarctic Ice Sheet to a marine-based configuration. Despite the middle Pleistocene climate reorganisation and associated ice-dynamic changes, we identify several regions conducive to conditions maintaining 1.5 Myr (million years) old ice, particularly around Dome Fuji, Dome C and Ridge B, which is in agreement with previous studies. This finding strengthens the notion that continuous records with such old ice do exist in previously identified regions, while we are also providing a dynamic continental ice-sheet context.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev , info:eu-repo/semantics/article
    Format: application/pdf
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