...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of geodynamics >Significance of secular trends of mass variations determined from GRACE solutions
【24h】

Significance of secular trends of mass variations determined from GRACE solutions

机译：从GRACE解决方案确定的质量变化的长期趋势的意义

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Since 2002 the Earth's gravity field is globally observed by the Gravity Recovery and Climate Experiment (GRACE) satellite mission. The GRACE monthly gravity field solutions, available from several analysis centres, reflect mass variations in the atmosphere, hydrosphere and geosphere. Due to correlated noise contained in these solutions, it is, however, first necessary to apply an appropriate filtering technique. The resulting, smoothed time series are applied not only to determine variations with different periodic signatures (e.g., seasonal, short and medium-term), but to derive long-periodic mass variations and secular trends as well. As the GRACE monthly solutions always show the integral effect of all mass variations, for separation of single processes, like the GIA (Glacial isostatic adjustment)-related mass increase in Fennoscandia, appropriate reduction models (e.g. from hydrology) are necessary.rnIn this study we show for the example of the Fennoscandian uplift area that GRACE solutions from different analysis centres yield considerably different secular trends. Furthermore, it turns out that the inevitable filtering of the monthly gravity field models affects not only the amplitudes of the signals, but also their spatial resolution and distribution such as the spatial form of the detected signals. It also becomes evident that the determination of trends has to be performed together with the determination of periodic components. All periodic terms which are really contained in the data, and only such, have to be included. The restricted time span of the available GRACE measurements, however, limits the separation of long-periodic and secular signals. It is shown that varying the analysis time span affects the results considerably. Finally, a reduction of hydrological signals from the detected integral secular trends using global hydrological models (WGHM, LaDWorld, GLDAS) is attempted. The differences among the trends resulting from different models illustrate that the state-of-the-art hydrology models are not suitable for this purpose as yet. Consequently, taking the GRACE monthly gravity field solutions from one centre, choosing a single filter and applying an insufficiently reliable reduction model leads sometimes to a misinterpretation of considered geophysical processes. Therefore, one has to be cautious with the final interpretation of the results.
机译：自2002年以来，重力恢复和气候实验（GRACE）卫星任务在全球范围内观测了地球重力场。可从多个分析中心获得的GRACE月度重力场解决方案反映了大气，水圈和地圈的质量变化。但是，由于这些解决方案中包含相关的噪声，因此首先需要应用适当的滤波技术。所得的平滑时间序列不仅用于确定具有不同周期性特征的变化（例如季节性，短期和中期），而且还可以得出长期质量变化和长期趋势。由于GRACE的月度解决方案始终显示出所有质量变化的综合影响，因此对于分离单个过程（如Genia冰盖等静压调整）相关的芬诺斯堪迪亚质量增加，有必要采用适当的减少模型（例如，来自水文学的方法）。我们以芬诺斯堪的纳隆起地区为例，表明来自不同分析中心的GRACE解决方案产生了明显不同的长期趋势。此外，事实证明，对月重力场模型的不可避免的滤波不仅影响信号的幅度，而且影响其空间分辨率和分布，例如所检测信号的空间形式。同样明显的是，趋势的确定必须与周期成分的确定一起执行。真正包含在数据中的所有定期术语都必须包括在内。但是，可用GRACE测量的有限时间跨度限制了长周期和长期信号的分离。结果表明，改变分析时间跨度会大大影响结果。最后，尝试使用全球水文模型（WGHM，LaDWorld，GLDAS）从检测到的整体长期趋势中减少水文信号。由不同模型得出的趋势之间的差异表明，最新的水文学模型尚不适合该目的。因此，从一个中心获取GRACE每月重力场解决方案，选择单个过滤器并应用不够可靠的缩减模型有时会导致对所考虑的地球物理过程的误解。因此，必须对结果的最终解释保持谨慎。

著录项

  • 来源
    《Journal of geodynamics》 |2009年第5期|157-165|共9页
  • 作者

    Holger Steffen; Svetozar Petrovic; Juergen Mueller; Roland Schmidt; Johann Wuensch; Franz Barthelmes; Juergen Kusche;

  • 作者单位

    Institut fuer Erdmessung, Leibniz Universitaet Hannover, Sctmeiderberg 50, D-30167 Hannover, Germany Department of Geoscience, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada;

    Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum - GFZ, Telegrafenberg, D-14473 Potsdam, Germany;

    Institut fuer Erdmessung, Leibniz Universitaet Hannover, Sctmeiderberg 50, D-30167 Hannover, Germany;

    Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum - GFZ, Telegrafenberg, D-14473 Potsdam, Germany Astrium GmbH, Robert-Koch-Str.1, D-81633 Muenchen, Germany;

    Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum - GFZ, Telegrafenberg, D-14473 Potsdam, Germany;

    Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum - GFZ, Telegrafenberg, D-14473 Potsdam, Germany;

    Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum - GFZ, Telegrafenberg, D-14473 Potsdam, Germany Astrium GmbH, Robert-Koch-Str.1, D-81633 Muenchen, Germany;

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

    GRACE; filtering; mass variation; glacial isostatic adjustment; global hydrology models;

    机译：恩典;过滤质量变化冰川均衡调整;全球水文模型;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号