Improved De-Aliasing for Gravity Field Modelling with GRACE

使用 GRACE 改进重力场建模的去锯齿功能

• 批准号: 30082063
• 负责人: Professor Dr.-Ing. Frank Flechtner
• 金额: --
• 依托单位: Centrum für Erdsystemforschung und Nachhaltigkeit (CEN)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/30082063?language=en
• 关键词: Improved; De; Aliasing; Gravity; Field

The work proposed addresses one of the main remaining problems in the GRACE data analysis, which is the atmospheric and oceanic de-aliasing. From the current perspective this is the limiting factor for the GRACE gravity field performance and for all follow-on studies. The de-aliasing is the process to remove apparent mass variations caused by the under-sampling of the GRACE orbit and its observations. The de-aliasing can be improved in two ways. (1) The atmospheric and oceanic pressure fields required for the de-aliasing shall not be regarded as error free. For this purpose extensive analysis of the key parameters by comparison with other model data or with independent observations shall be done. Outcome of this work shall be representative error measures for the required parameters. (2) The complete sampling and aliasing model shall be better understood and the error propagation from the representative errors to the gravity field shall be developed and implemented. For the sampling and aliasing model all known mass effects as well as the orbit characteristics and available observations shall be taken into account. In a final step all results shall be taken into account for a re-computation of a homogeneous GRACE gravity field time series, which shall be used as input for subsequent studies within the priority programme.

所提出的工作解决了GRACE数据分析中的主要遗留问题之一，即大气和海洋去混叠。从目前的角度来看，这是GRACE重力场性能和所有后续研究的限制因素。去混叠是消除GRACE轨道及其观测采样不足造成的明显质量变化的过程。可以通过两种方式改进去混叠。(1)解混叠所需的大气和海洋压力场不得视为无误差。为此，应通过与其他模型数据或独立观察结果进行比较，对关键参数进行广泛分析。这项工作的结果应是所需参数的代表性误差测量。(2)应更好地理解完整的采样和混叠模型，并应开发和实施从代表性误差到重力场的误差传播。对于取样和混叠模型，应考虑到所有已知的质量效应以及轨道特征和现有观测结果。在最后一步，所有结果都应考虑到同质GRACE重力场时间序列的重新计算，该时间序列应用作优先计划内后续研究的输入。

项目成果

The Release 04 CHAMP and GRACE EIGEN Gravity Field Models

• DOI: 10.1007/978-3-642-10228-8_4
• 发表时间: 2010
• 作者: F. Flechtner;C. Dahle;K. Neumayer;R. König;C. Förste

The Role of the Atmosphere for Satellite Gravity Field Missions

• DOI: 10.1007/978-3-540-85426-5_13
• 发表时间: 2009
• 作者: T. Gruber;T. Peters;Lieselotte Zenner

Comparison of GRACE and Model-Based Estimates of Bottom Pressure Variations Against In Situ Bottom Pressure Measurements

GRACE 和基于模型的底部压力变化估计与原位底部压力测量的比较

• DOI: 10.1007/978-3-642-10228-8_23
• 发表时间: 2010
• 作者: Stammer;D. A. Kohl;V. Romanova;F. Siegismund
• 通讯作者: F. Siegismund

Ocean bottom pressure variations estimated from gravity, nonsteric sea surface height and hydrodynamic model simulations

根据重力、非立体海面高度和水动力模型模拟估算海底压力变化

• DOI: 10.1029/2010jc006727
• 发表时间: 2011
• 期刊: Journal of Geophysical Research
• 作者: Siegismund F;A. Köhl;D. Stammer
• 通讯作者: D. Stammer

Improved Non-tidal Atmospheric and Oceanic De-aliasing for GRACE and SLR Satellites

改进 GRACE 和 SLR 卫星的非潮汐大气和海洋去混叠

• DOI: 10.1007/978-3-642-10228-8_11
• 发表时间: 2010
• 作者: Flechtner F;Thomas M;Dobslaw H.
• 通讯作者: Dobslaw H.