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首页> 外文期刊>Journal of Glaciology >Nivlisen, an Antarctic ice shelf in Dronolng Maud Land: geodetic-glaciologlcal results from a combined analysis of ice thickness, ice surface height and ice-flow observations
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Nivlisen, an Antarctic ice shelf in Dronolng Maud Land: geodetic-glaciologlcal results from a combined analysis of ice thickness, ice surface height and ice-flow observations

机译：Dronolng Maud Land的南极冰架：冰厚度，冰面高度和冰流量观测的联合分析

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摘要

Extensive observations on Nivlisen, an ice shelf on Antarctica's Atlantic coast, are analyzed and combined to obtain a new description of its complex glaciological regime. We generate models of ice thickness (primarily from ground-penetrating radar), ellipsoidal ice surface height (primarily from ERS-1 satellite altimetry), freeboard height (by utilizing precise sea surface information) and ice-flow velocity (from ERS-11-2 SAR interferometry and GPS measurements). Accuracy assessments are included. Exploiting the hydrostatic equilibrium relation, we infer the 'apparent air layer thickness' as a useful measure for a glacier's density deviation from a pure ice body. This parameter exhibits a distinct spatial variation (ranging from ≈2 to ≈16m) which we attribute to the transition from an ablation area to an accumulation area. We compute mass-flux and mass-balance parameters on a local and areally integrated scale. The combined effect of bottom mass balance and temporal change averaged over an essential part of Nivlisen is -654±170kgirT2a-1, which suggests bottom melting processes dominate. We discuss our results in view of temporal ice-mass changes (including remarks on historical observations), basal processes, near-surface processes and ice-flow dynamical features. The question of temporal changes remains open from the data at hand, and we recommend further observations and analyses for its solution.
机译：分析并结合在南极洲大西洋海岸上的南极洲的冰架的广泛观察，以获得其复杂的冰川制度的新描述。我们生成冰厚度（主要来自地面穿透雷达），椭圆形冰面高度（主要来自ERS-1卫星高度偏移），流动高度（通过利用精确的海面信息）和冰流速（来自ERS-11- 2 SAR干涉测量和GPS测量）。包括准确性评估。利用静水压平衡关系，推断“表观空气层厚度”作为冰川密度偏差与纯冰体的有用措施。该参数表现出不同的空间变化（范围从≈2至≈16），我们将从消融区域转换到累积区域。我们在本地和非常集成的尺度上计算质量磁通和质量平衡参数。在Nivlisen的必要部分上平均底部质量平衡和时间变化的综合作用为-654±170kgirt2a-1，表明底部熔化过程占主导地位。我们讨论了我们的结果，鉴于时间巨大变化（包括历史观察的言论），基础过程，近表面过程和冰流动态特征。时间变化问题仍然从手头的数据中仍然开放，我们建议进一步观察和分析其解决方案。

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  • 来源
    《Journal of Glaciology》 |2006年第176期|共14页
  • 作者

    Martin HORWATH; Reinhard DIETRICH; Michael BAESSLER; Uwe NIXDORF; Daniel STEINHAGE; Diedrich FRITZSCHE; Volkmar DAMM; Gemot REITMAYR;

  • 作者单位

    Technische Universityt Dresden Institut fur Planetare Geodasie D-01062 Dresden Germany;

    Technische Universityt Dresden Institut fur Planetare Geodasie D-01062 Dresden Germany;

    Technische Universityt Dresden Institut fur Planetare Geodasie D-01062 Dresden Germany;

    Alfred Wegener Institute for Polar and Marine Research PO Box 120161 D-27515 Bremerhaven Germany;

    Alfred Wegener Institute for Polar and Marine Research PO Box 120161 D-27515 Bremerhaven Germany;

    Alfred Wegener Institute for Polar and Marine Research PO Box 600149 D-14473 Potsdam Germany;

    Federal Institute for Geosciences and Natural Resources (BGR) PO Box 510153 D-30631 Hannover Germany;

    Federal Institute for Geosciences and Natural Resources (BGR) PO Box 510153 D-30631 Hannover Germany;

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  • 正文语种 eng
  • 中图分类 冰川;
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