Determination of the Earth's pole tide Love number k2 from observations of polar motion using an adaptive Kalman filter approach
Determination of the Earth's pole tide Love number k2 from observations of polar motion using an adaptive Kalman filter approach
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DOI：
10.1029/2012jb009296
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发表时间：
2012-09
影响因子：
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通讯作者：
F. Seitz;S. Kirschner;D. Neubersch
中科院分区：
文献类型：
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作者：
F. Seitz;S. Kirschner;D. Neubersch
[1]地球自转参数（ERP）观测时间序列的地球物理解释通常基于描述和平衡地球各个子系统中角动量变化的数值模型。当然，模型取决于几何、流变和物理参数。其中许多都是从其他模型或观测中弱确定的。在我们的研究中，我们提出了一个自适应卡尔曼滤波方法的参数的动态地球系统模型DyMEG，它作为一个模拟器的ERP的改进。特别是我们专注于改进的极潮Love数k2。在灵敏度分析的框架中，k2已被确定为DyMEG的最关键的参数之一，因为它直接影响建模的钱德勒振荡。同时，k2是模型中最不确定的参数之一。我们的模拟与DyMEG涵盖了60年后，达到稳定状态的K2。考虑到地幔和海洋的滞弹性响应，k2的估计值为0.3531 + 0.0030i。我们表明，DyMEG中的应用程序的改进参数k2导致显着更好的结果比原始值从国际地球自转和参考系服务（IERS）的公约采取的极运动。
[1] The geophysical interpretation of observed time series of Earth rotation parameters (ERP) is commonly based on numerical models that describe and balance variations of angular momentum in various subsystems of the Earth. Naturally, models are dependent on geometrical, rheological and physical parameters. Many of these are weakly determined from other models or observations. In our study we present an adaptive Kalman filter approach for the improvement of parameters of the dynamic Earth system model DyMEG which acts as a simulator of ERP. In particular we focus on the improvement of the pole tide Love number k2. In the frame of a sensitivity analysis k2 has been identified as one of the most crucial parameters of DyMEG since it directly influences the modeled Chandler oscillation. At the same time k2 is one of the most uncertain parameters in the model. Our simulations with DyMEG cover a period of 60 years after which a steady state of k2 is reached. The estimate for k2, accounting for the anelastic response of the Earth’s mantle and the ocean, is 0.3531 + 0.0030i. We demonstrate that the application of the improved parameter k2 in DyMEG leads to significantly better results for polar motion than the original value taken from the Conventions of the International Earth Rotation and Reference Systems Service (IERS).