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Penitentes as the origin of the bladed terrain of Tartarus Dorsa on Pluto

机译：Penitentes是冥王星上Tartarus Dorsa刀刃地形的起源

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摘要

Penitentes are snow and ice features formed by erosion that, on Earth, are characterized by bowl-shaped depressions several tens of centimetres across, whose edges grade into spires up to several metres tall(1-3). Penitentes have been suggested as an explanation for anomalous radar data on Europa(4), but until now no penitentes have been identified conclusively on planetary bodies other than Earth. Regular ridges with spacings of 3,000 to 5,000 metres and depths of about 500 metres with morphologies that resemble penitentes have been observed by the New Horizons spacecraft(5-8) in the Tartarus Dorsa region of Pluto (220 degrees-250 degrees E, 0 degrees-20 degrees N). Here we report simulations, based upon a recent model(3) representing conditions on Pluto(7,9), in which deepening penitentes reproduce both the tri-modal (north-south, east-west and northeast-southwest) orientation and the spacing of the ridges of this bladed terrain. At present, these penitentes deepen by approximately one centimetre per orbital cycle and grow only during periods of relatively high atmospheric pressure, suggesting a formation timescale of several tens of millions of years, consistent with crater ages. This timescale implies that the penitentes formed from initial topographic variations of no more than a few tens of metres, consistent with Pluto's youngest terrains.
机译：it悔是由侵蚀形成的冰雪特征，在地球上，其特征是横跨数十厘米的碗状凹陷，其边缘可分为高达几米高的尖顶（1-3）。有人建议用悔者来解释欧罗巴上的异常雷达数据（4），但是到目前为止，除地球以外，还没有最终发现pen悔者。新视野号航天器（5-8）在冥王星的塔塔鲁斯多尔萨地区（东经220度至250度，0度）观察到间距为3,000至5,000米，深度约为500米的规则脊，其形态类似于pen齿-20度N）。在这里，我们基于最近的模型（3）表示冥王星（7,9）的情况，报告了模拟，其中加深的it齿再现了三峰（北-南，东西-和东北-西南）方向和间距片状地形的山脊。目前，这些pen悔体每个轨道周期加深约一厘米，并且仅在相对较高的大气压期间才生长，这表明与火山口年龄一致的形成时间尺度为数千万年。这个时间尺度意味着the悔期是由不超过几十米的初始地形变化形成的，与冥王星最年轻的地形一致。

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  • 来源
    《Nature》 |2017年第7636期|188-190|共3页
  • 作者

    Moores John E.; Smith Christina L.; Toigo Anthony D.; Guzewich Scott D.;

  • 作者单位

    York Univ, Ctr Res Earth & Space Sci, Dept Earth & Space Sci & Engn, 4700 Keele St, N York, ON M3J 1P3, Canada;

    York Univ, Ctr Res Earth & Space Sci, Dept Earth & Space Sci & Engn, 4700 Keele St, N York, ON M3J 1P3, Canada;

    Johns Hopkins Univ, Appl Phys Lab, Baltimore, MD 21218 USA;

    NASA, Goddard Space Flight Ctr, Greenbelt, MD USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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