Recursive Adjustment Approach for the Estimation of Physical Earth Parameters from Polar Motion

Recursive Adjustment Approach for the Estimation of Physical Earth Parameters from Polar Motion
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极移估计物理地球参数的递归调整方法

DOI:
10.1007/978-3-642-37222-3_60
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
Kirschner
Kirschner
中科院分区:
--
文献类型:
--
作者:
Kirschner

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南极大陆以北的海洋是地球上最具活力的海洋区域之一。它对于全球气候的调节也至关重要。我们使用大地测量数据计算高分辨率平均动态海洋地形(MDT),并得出该关键区域全球海洋环流的详细模型。 MDT 使用多任务高度计数据和 GRACE/GOCE 重力模型 GOCO2s 确定。平均海面是17年卫星测高联合交叉平差观测得到的。两个大地测量重力任务 GRACE 和 GOCE 能够以前所未有的精度和空间分辨率计算全球大地水准面。 GRACE 极大地提高了长中波长重力模型的准确性和全局一致性,而 GOCE 则在中波长范围内添加了高精度大地水准面信息。大地水准面和平均海面已通过光谱滤波器保持一致。 MDT 表示为球谐展开式。这使我们能够分析不同波段的海洋内容。为了评估 MDT 和导出的地转速度场的特性,将速度与来自南极绕极流 (ACC) 区域卫星跟踪的表面漂流器的独立数据进行比较。即使考虑最短尺度(100 公里),差异的 RMS 也小于 9 厘米/秒。我们的研究表明,仅用 6 个月的 GOCE 数据,我们就能够显着改进大地测量 MDT。
The ocean north of the Antarctic continent is one of the most dynamic ocean areas on our globe. It is also critical for the regulation of the global climate. We compute a high resolution mean dynamical ocean topography (MDT) using geodetic data and derive a detailed model of the global ocean circulation in this crucial area. The MDT is determined using multi-mission altimeter data and the GRACE/GOCE gravity model GOCO2s. The mean sea surface is observed from joint cross-over adjustment of 17 years of satellite altimetry. The two geodetic gravity missions GRACE and GOCE allow the computation of a global geoid with unprecedented accuracy and spatial resolution. While GRACE greatly improved the accuracy and global consistency of gravity models at long to medium wavelengths, GOCE is adding highly accurate geoid information in the medium wavelength range. The geoid and mean sea surface have been made consistent by a spectral filter. The MDT is represented as a spherical harmonic expansion. This allows us to analyze the oceanographic content in different wavelength bands. In order to assess properties of the MDT and of the derived geostrophic velocity field, velocities are compared with independent data from satellite tracked surface drifters in the area of the Antarctic Circumpolar Current (ACC). The RMS of the differences is less than 9 cm/s even if shortest scales (100 km) are considered. Our study shows that, with just 6 months of GOCE data, we are able to improve significantly the geodetic MDT.
DOI: 10.1111/j.1365-246x.2004.02208.x
发表时间: 2004
影响因子: 2.8
作者:
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通讯作者: Maik Thomas
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DOI: 10.1007/3-540-27432-4_102
发表时间: 2005
期刊: bioRxiv
影响因子: --
作者:
F. Seitz;H. Kutterer
通讯作者: H. Kutterer
DOI: 10.1029/2012jb009296
发表时间: 2012-09
影响因子: --
作者:
F. Seitz;S. Kirschner;D. Neubersch
通讯作者: F. Seitz;S. Kirschner;D. Neubersch