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首页> 外文期刊>International journal of image and data fusion >The ice sheet height changes and mass variations in Antarctica by using ICESat and GRACE data
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The ice sheet height changes and mass variations in Antarctica by using ICESat and GRACE data

机译：利用ICESat和GRACE数据，南极冰盖高度变化和质量变化

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摘要

The Gravity Recovery and Climate Experiment (GRACE) satellite mission has provided the monthly earth's gravity field models since August 2002, from which the mass variations in Antarctica can be estimated. Because of the very low-degree spherical harmonic coefficients, especially the degree-2 zonal term J_2 are not well determined by GRACE, more attention should be paid on the effects of J_2 when the earth's mass variations are derived from spherical harmonic coefficients. To see the differences more clearly, wavelet transformation is applied to the J_2 time series derived from GRACE measurements by different agencies, such as Centre National d'Etudes Spatiales/Groupe de Recher de Deodesie Spatiale, GeoForschungsZentrum Potsdam, University of Texas Center for Space Research and that from satellite laser ranging observations. Periodic signals can be seen from the wavelet spectra. A Gaussian smoothing with a radius of 300 km is used in the gravity model-based mass rate estimation. Meanwhile, NASA's Ice, Cloud, and land Elevation Satellite (ICESat) has provided repeated laser altimeter data, and the ice sheet height changes are estimated by using crossover analysis. The mass rates estimated from GRACE are compared to the ice sheet height changes from ICESat. The mass rate in Amundsen Sea Embayment is estimated up to —8cm/yr from GRACE, while the ice sheet height changes observed from ICESat is up to —32 cm over more than 3 years, this shows the comparable results in this region.
机译：自2002年8月以来，重力恢复和气候实验（GRACE）卫星任务提供了每月的地球重力场模型，据此可以估算南极洲的质量变化。由于GRACE不能很好地确定度数球谐系数，特别是2度带状项J_2，因此，当从球谐系数得出地球质量变化时，应更加注意J_2的影响。为了更清楚地看到这些差异，将小波变换应用于不同机构从GRACE测量得出的J_2时间序列，例如国家航天中心/德歇空间集团，GeoForschungsZentrum Potsdam，德克萨斯大学空间研究中心以及来自卫星激光测距的观测结果。从小波频谱可以看到周期信号。半径为300 km的高斯平滑用于基于重力模型的质量速率估计中。同时，美国国家航空航天局的冰，云和陆地高程卫星（ICESat）提供了重复的激光高度计数据，并使用交叉分析估算了冰盖高度的变化。将GRACE估算的质量比率与ICESat的冰盖高度变化进行比较。据估计，距GRACE的阿蒙森海堤的质量速率可达-8cm / yr，而三年以上从ICESat观测到的冰盖高度变化可达-32cm，这表明该地区的结果可比。

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  • 来源
    《International journal of image and data fusion》 |2011年第3期|p.255-265|共11页
  • 作者

    Hanjiang Wen; Guangbin Zhu; Pengfei Cheng; Xiaotao Chang; Huanling Liu;

  • 作者单位

    Department of Geodesy, Chinese Academy of Surveying and Mapping, Beitaipinglu 16,Beijing 100039, China;

    School of Geodesy and Geomatics, Wuhan University,129 Luoyu Road, Wuhan 430079, China;

    Department of Geodesy, Chinese Academy of Surveying and Mapping, Beitaipinglu 16,Beijing 100039, China;

    Department of Geodesy, Chinese Academy of Surveying and Mapping, Beitaipinglu 16,Beijing 100039, China;

    Department of Geodesy, Chinese Academy of Surveying and Mapping, Beitaipinglu 16,Beijing 100039, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    grace; icesat; ice sheet; antarctica; wavelets;

    机译：恩典;冰沙冰盖;南极洲;小波;

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