Annual deformation signals from homogeneously reprocessed VLBI and GPS height time series
Annual deformation signals from homogeneously reprocessed VLBI and GPS height time series
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DOI：
10.1007/s00190-009-0316-3
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发表时间：
2009-05
影响因子：
4.4
通讯作者：
V. Tesmer;P. Steigenberger;M. Rothacher;J. Boehm;B. Meisel
中科院分区：
文献类型：
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作者：
V. Tesmer;P. Steigenberger;M. Rothacher;J. Boehm;B. Meisel
本文第一部分比较了1994 - 2007年均匀再处理的甚长基线干涉测量（VLBI）和全球定位系统（GPS）长期高度序列。数据分析使用完全适应的最先进的模型（如VMF1和ECMWF的先验天顶延迟）进行GPS和VLBI处理。该系列在长期非线性行为，谐波和平均年信号（不一定是谐波性质）方面进行比较。两种技术之间的相似性非常好（特别是平均年信号），这被认为是由于适应的模型和一致的两个系列的再处理。由于两种几乎独立的观测技术在几乎所有共同定位的地点看到相同的每年重复的信号，我们期望作为整体垂直变形的良好地球物理可解释性。本文的第二部分，利用161个合适的GPS站点的高度时间序列（与之前相同的解）来确定每个站点的谐波和平均年信号。将这个大数据集的年度信号与其他出版物中描述的grace确定的负载变形进行视觉比较，我们发现了很好的一致性。这强调了一个假设，即我们的高度数据很有可能被解释为地球物理信号。在这161个观测点中，如果至少有两个附近的观测点（大约几千公里）显示出相似的年平均信号，那么131个观测点就被分成55个星团，从而证实这是真正的区域变形，而不是局部的或技术上的人工制品。这55个信号呈现在区域平均年高度信号的“世界地图”上，作为验证地球物理模型的易于处理的工具。这些实测的区域年平均信号数据可从网页下载，以作数值分析。
The first part of this paper compares homogeneously reprocessed Very Long Baseline Interferometry (VLBI) and Global Positioning System (GPS) long-term height series from 1994 to 2007. The data analysis used fully adapted state-of-the-art models (like VMF1 and a priori zenith delays from ECMWF) for the GPS and VLBI processing. The series are compared in terms of long-term non-linear behaviour, harmonic and mean annual signals (not necessarily of harmonic nature). The similarity between both techniques is very good (especially the mean annual signals), which is assumed to be due to the adapted models and consistent reprocessing of both series. As two almost independent observing techniques see the same annually recurring signals at almost all co-located sites, we expect a good geophysical interpretability as integral vertical deformation. For the second part of this paper, the height time series of 161 suitable GPS sites (of the same solution as before) are used to determine a harmonic and a mean annual signal for each of them. Comparing the annual signals for this big dataset visually to GRACE-determined load deformations described in other publications, we find good agreement. This puts emphasis to the assumption that our height data have a lot of potential to be interpreted as geophysical signals. Out of these 161, 131 are grouped to 55 clusters, if at least two nearby (some thousand kilometres) sites show similar mean annual signals, which are thus confirmed to be real regional deformation, not local or technical artefacts. These 55 signals are presented on a “world map” of regional average mean annual height signals, as easy-to-handle tool to validate geophysical models. The data of these measured regional mean annual signals can be downloaded from a web-page for numerical analysis.