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  • 2020-2022
  • 2005-2009  (9)
  • 2009  (4)
  • 2008  (5)
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  • 2020-2022
  • 2005-2009  (9)
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  • 1
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    Mass budget of the grounded ice in Lambert Glacier-Amery Ice Shelf system (2008)
    In:  EPIC3Annals of Glaciology, 48, pp. 193-197
    Details
    Publication Date: 2019-07-17
    Description: We used remote-sensing and in situ measurements of surface accumulation rate, ice surface velocity, thickness and elevation to evaluate the mass budgets of grounded ice-flow regimes that form the Lambert Glacier-Amery Ice Shelf system. Three distinct drainage regimes are considered: the western and eastern margins of the ice shelf, and the southern grounding line at the major outlet glacier confluence, which can be identified with drainage zones 9, 11 and 10 respectively of Giovinetto and Zwally (2000). Our findings show the entire grounded portion of the basin is approximately in balance, with a mass budget of -4.2_9.8 Gt a-1. Drainages 9, 10 and 11 are within balance to the level of our measurement uncertainty, with mass budgets of -2.5_2.8 Gt a-1, -2.6_7.8 Gt a-1 and 0.9_2.3 Gt a-1, respectively. The region upstream of the Australian Lambert Glacier basin (LGB) traverse has a net mass budget of 4.4_6.3 Gt a-1, while the downstream region has -8.9_9.9 Gt a-1. These results indicate that glacier drainages 9, 10 and 11, upstream and downstream of the Australian LGB traverse, are in balance to within our measurement error.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 2
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    Reconstruction of the annual balance of Vadret da Morteratsch, Switzerland, since 1865 (2009)
    In:  EPIC3Annals of Glaciology, 50, pp. 126-134
    Details
    Publication Date: 2019-07-17
    Description: We have reconstructed the annual balance of the Vadret da Morteratsch, Engadine, with a two-dimensional energy-balance model for the period between 1865 and 2005. The model takes into account a parameterisation of the surface energy fluxes, an albedo that decreases exponentially with snow depth as well as the shading effect of the surrounding mountains. The model was first calibrated with a 5-year record of annual balance measurements made at 20 different sites on the glacier between 2001 and 2006 using meteorological data from surrounding weather stations as input. To force the model for the period starting in 1865 we employed monthly temperature and precipitation records from nearby valley stations. The model is capable to reproduce the observed annual balance reasonably well, except for the lower part during the warmest years. Most crucial to the results is the altitudinal precipitation gradient, but this factor is hard to quantify from the limited precipitation data at high elevations. The simulation shows an almost continuous mass loss since 1865, with short interruptions around 1920, 1935 and 1980. A trend towards a more negative annual balance can be observed since the beginning of the 1980s. The simulated cumulative mass balance for the entire period from 1865 to 2005 was found to be -46 m w.e.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 3
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    Past and present accumulation rate reconstruction along the Dome Fuji-Kohnen radio echo sounding profile, Dronning Maud Land, East Antarctica (2009)
    In:  EPIC3Annals of Glaciology, 50(51), pp. 112-120
    Details
    Publication Date: 2019-07-16
    Description: We used internal ice layers from a radio-echo sounding profile between the Kohnen and Dome Fuji deep drilling sites to infer the spatio-temporal pattern of accumulation rate in this sector of Dronning Maud Land, East Antarctica. Continuous internal reflection horizons can be traced to about half of the ice thickness and have a maximum age of approximately 72.7 ka BP. To infer palaeoaccumulation rates from the dated layers, we derived the thinning functions from a flow calculation with a high-resolution higher-order model of Dronning Maud Land embedded into a three-dimensional thermomechanical model of the Antarctic ice sheet. The method takes into account complex ice-flow dynamics and advection effects that cannot be dealt with using traditional local approaches. We selected seven time intervals over which we determine the average accumulation rate and average surface temperature at the place and time of origin of the layer particles. Our results show lower accumulation rates along eastern parts of the profile for the late Holocene (05 ka BP) than are shown by existing maps, which had no surface control points. During the last glacial period we find a substantially lower accumulation rate than predicted by the usual approach linking palaeo-accumulation rates to the condensation temperature above the surface inversion layer. These findings were used to fine-tune the relation between accumulation rate and temperature.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 4
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    Simulating the Antarctic Ice Sheet with a coupled Atmosphere - Ice Sheet model approach (2008)
    In:  EPIC323. International Polartagung der Deutschen Gesellschaft fuer Polarforschung, 10.-14.03.2008, Muenster.
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    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 5
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    The Greenland ice sheet (2008)
    In:  EPIC3in: D. Cuff and A. Goudie (eds.), The Oxford companion to global change, Oxford University Press (USA), pp. 310-316
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
    Format: application/pdf
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  • 6
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    Sensitivity of the EDML ice core chronology to the geothermal heat flux (2008)
    In:  EPIC3Materialy Glatsiologicheskikh issledovanii (Data of glaciological studies), 105, pp. 35-40
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    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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  • 7
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    Greenland Ice Sheet Evolution (2008)
    In:  EPIC3DFG 2.SPP 1257 Workshop, Herrsching.3.-2.4.2008., 31
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    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 8
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    Cryosphere (2009)
    In:  EPIC3in Gornitz, V. (ed.): Encyclopedia of paleoclimatology and ancient environments, Encyclopaedia of Earth Science Series, Springer Verlag (Berlin, Heidelberg, New York), pp. 221-226
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Inbook , peerRev
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  • 9
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    Surface mass-balance changes of the Greenland ice sheet since 1866 (2009)
    In:  EPIC3Annals of Glaciology, 50, pp. 178-184
    Details
    Publication Date: 2019-07-17
    Description: Mass loss from the Greenland ice sheet over the past decade has caused the impression thatthe ice sheet has been behaving anomalously to the warming of the 1990s. We have reconstructed the recent (18662005) surface mass-balance (SMB) history of the Greenland ice sheet on a 5x5 km grid using a runoff-retention model based on the positive degree-day method. The model is forced with new datasets of temperature and precipitation patterns dating back to 1866.We use an innovative method to account for the influence of year-on-year surface elevation changes on SMB estimates and have found this effect to be minor. All SMB estimates are made relative to the 196190 average SMB and we compare annual SMB estimates from the period 19952005 to a similar period in the past (192333) where SMB was comparable, and conclude that the present-day changes are not exceptional within the last 140 years. Peripheral thinning has dominated the SMB response during the past decade, as in 192333, but we also show that thinning was not restricted to the margins during this earlier period.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , peerRev
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