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首页> 外文期刊>International journal of remote sensing >Ice sheet survey over Antarctica using satellite altimetry: ERS-2, Envisat, SARAL/AltiKa, the key importance of continuous observations along the same repeat orbit
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Ice sheet survey over Antarctica using satellite altimetry: ERS-2, Envisat, SARAL/AltiKa, the key importance of continuous observations along the same repeat orbit

机译:使用卫星测高仪对南极洲进行冰盖调查:ERS-2,Envisat,SARAL / AltiKa,这是在同一重复轨道上进行连续观测的关键

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摘要

From September 2002 to October 2010, the Envisat radar altimeter surveyed Greenland and Antarctica ice sheets on a 35 day repeat orbit, providing a unique data set for ice sheet mass balance studies. Up to 85 repeat cycles are available and the whole Envisat data set may be along-track processed in order to provide height variability and trend with a good spatial resolution for the objectives of ice sheet survey. Soon, a joint Centre National d'Etudes Spatiales/Indian Space Research Organisation mission, SARAL (Satellite with Argos and AltiKa), with the AltiKa payload on board, will be launched on exactly the same orbit (less than 1 km of the nomimal orbit in the across-track direction). This will allow an extension of previous European Remote Sensing (ERS) satellite, ERS-1 and ERS-2, and Envisat missions of the European Space Agency (ESA), in particular from the point of view of ice altimetry. However, AltiKa operates in the Ka band (36.8 GHz), a higher frequency than the classical Ku band (13.6 GHz), leading to important modifications and potential improvements in the interactions between radar wave and snow-pack. In this paper, a synthesis is presented of all available information relevant to ice altimetry scientific purposes as derived from the Envisat mission: mean and temporal derivatives of the height - but also of the backscatter and of the two waveform parameters - snow-pack change corrections, across-track surface slope at 1 km scale, etc. The spatial and temporal variability of ice sheet surface elevation is investigated with the help of the high-resolution Envisat along-track observations. We show that at least 50 repeat cycles are needed to reach the required accuracy for the elevation trend. It is thus advocated as potentially highly beneficial for SARAL/AltiKa as a follow-on mission. Moreover, the novel characteristics of SARAL/AltiKa are promising in improving our understanding of snow penetration impact.
机译:从2002年9月到2010年10月,Envisat雷达高度计在35天的重复轨道上对格陵兰和南极冰盖进行了勘测,为冰盖质量平衡研究提供了独特的数据集。多达85个重复周期可用,整个Envisat数据集可沿轨道进行处理,以提供高度可变性和趋势,并具有良好的空间分辨率,可用于冰盖调查的目标。很快,国家空间技术研究中心/印度空间研究组织的联合任务SARAL(带有Argos和AltiKa的卫星)将搭载AltiKa载荷,将在完全相同的轨道上发射(小于标称轨道的1公里)在跨轨方向)。这将允许扩展以前的欧洲遥感(ERS)卫星,ERS-1和ERS-2,以及欧洲航天局(ESA)的Envisat任务,尤其是从冰测高程的角度来看。但是,AltiKa在Ka频段(36.8 GHz)上运行,该频率高于经典Ku频段(13.6 GHz),从而对雷达波与积雪之间的相互作用进行了重要的修改和潜在的改进。在本文中,对从Envisat任务得出的与冰测高仪科学目的相关的所有可用信息进行了综合:高度的均值和时间导数-以及反向散射和两个波形参数的积雪变化校正,跨轨道表面坡度为1 km等。借助高分辨率Envisat沿轨道观测资料,研究了冰盖表面高度的时空变化。我们显示至少需要50个重复周期才能达到海拔趋势所需的精度。因此,作为后续任务,它被认为对SARAL / AltiKa具有潜在的巨大益处。此外,SARAL / AltiKa的新颖特性有望改善我们对积雪渗透影响的理解。

著录项

  • 来源
    《International journal of remote sensing》 |2014年第14期|5497-5512|共16页
  • 作者单位

    LEGOS, CNRS, Toulouse Cedex 31400, France;

    LEGOS, CNRS, Toulouse Cedex 31400, France;

    LEGOS, CNRS, Toulouse Cedex 31400, France ,CLS, 31520 Ramonville Saint-Agne, Toulouse, France;

    LGGE, CNRS, 38041 Grenoble Cedex 9, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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