Geocenter Estimates from Time-Variable Gravity and Ocean Model Outputs

<strong>Last Updated: 2023-03-03</strong> <br> <strong>File descriptions:</strong> <br> <em>CSR_RL06_MPIOM_SLF_iter.txt</em> Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE/GRACE-FO Release-6 time-variable gravity fields from the University of Texas Center for Space Research (CSR) and outputs from the MPIOM ocean model. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored. <br> <em>CSR_RL06_MPIOM_SLF_iter_wAOD.txt</em> Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE/GRACE-FO Release-6 time-variable gravity fields from the University of Texas Center for Space Research (CSR) and outputs from the MPIOM ocean model. Release-6 atmospheric and oceanic de-aliasing (AOD) product has been restored. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored. <br> <em>GFZ_RL06_MPIOM_SLF_iter.txt</em> Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE/GRACE-FO Release-6 time-variable gravity fields from the German Center for Geosciences (GeoForschungsZentrum, GFZ) and outputs from the MPIOM ocean model. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored. <br> <em>GFZ_RL06_MPIOM_SLF_iter_wSLR21_wSLR22.txt</em> Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE/GRACE-FO Release-6 time-variable gravity fields from the German Center for Geosciences (GeoForschungsZentrum, GFZ) and outputs from the MPIOM ocean model. GRACE/GRACE-FO derived figure axis harmonics (C_2,1and S_2,1) and azimuthal dependence harmonics (C_2,2and S_2,2) were replaced with values from Satellite Laser Ranging (SLR) provided by Bryant Loomis at NASA Goddard Space Flight Center (GSFC). Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored. <br> <em>GFZ_RL06_MPIOM_SLF_iter_wAOD.txt</em> Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE/GRACE-FO Release-6 time-variable gravity fields from the German Center for Geosciences (GeoForschungsZentrum, GFZ) and outputs from the MPIOM ocean model. Release-5 atmospheric and oceanic de-aliasing (AOD) product has been restored. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored. <br> <em>JPL_RL06_MPIOM_SLF_iter.txt</em> Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE/GRACE-FO Release-6 time-variable gravity fields from the Jet Propulsion Laboratory (JPL) and outputs from the MPIOM ocean model. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored. <br> <em>JPL_RL06_MPIOM_SLF_iter_wAOD.txt</em> Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE/GRACE-FO Release-6 time-variable gravity fields from the Jet Propulsion Laboratory (JPL) and outputs from the MPIOM ocean model. Release-6 atmospheric and oceanic de-aliasing (AOD) product has been restored. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored. <br> <br> <strong>Data Descriptions:</strong> Data format: (f11.4,3e20.12,i4) <br> <strong>Data columns:</strong> mid-epoch_time: mid-date of each measurement epoch in decimal-years C10: fully normalized cosine coefficient for degree 1 and order 0 C11: fully normalized cosine coefficient for degree 1 and order 1 S11: fully normalized sine coefficient for degree 1 and order 1 month: GRACE/GRACE-FO month of each measurement epoch (months starting 2002-01-01) <br> <br> <strong>Reference:</strong> T. C. Sutterley and I. Velicogna. Improved Estimates of Geocenter Variability from Time-Variable Gravity and Ocean Model Outputs. <em>Remote Sensing</em>, 11(2108), 2019. <br> <strong>Disclaimer:</strong> This data provided here is not sponsored or maintained by the Universities Space Research Association (USRA), the Center for Space Research (UTCSR), the Jet Propulsion Laboratory (JPL), the German Research Centre for Geosciences (GeoForschungsZentrum, GFZ) or NASA. It is provided here under a Creative Commons 4.0 license but with no guarantees whatsoever.

最后更新：2023-03-03

<strong>文件说明：</strong>
<em>CSR_RL06_MPIOM_SLF_iter.txt</em>：采用自洽迭代地心解算得到的月度地心估计值，该解算纳入了自吸引与负荷效应。计算所用数据来自德克萨斯大学空间研究中心（Center for Space Research, CSR）发布的GRACE/GRACE-FO第六版（Release-6）时变重力场，以及马克斯·普朗克海洋模式（MPIOM）的输出结果。已恢复使用ICE-6G冰盖历史的A等人2013年研究中的冰川均衡调整（Glacial Isostatic Adjustment, GIA）估计值。
<em>CSR_RL06_MPIOM_SLF_iter_wAOD.txt</em>：采用自洽迭代地心解算得到的月度地心估计值，该解算纳入了自吸引与负荷效应。计算所用数据来自德克萨斯大学空间研究中心（CSR）发布的GRACE/GRACE-FO第六版时变重力场，以及MPIOM海洋模式的输出结果。已恢复使用第六版大气与海洋去混叠（Atmospheric and Oceanic De-aliasing, AOD）产品，同时已恢复使用ICE-6G冰盖历史的A等人2013年研究中的GIA估计值。
<em>GFZ_RL06_MPIOM_SLF_iter.txt</em>：采用自洽迭代地心解算得到的月度地心估计值，该解算纳入了自吸引与负荷效应。计算所用数据来自德国地球科学研究中心（GeoForschungsZentrum, GFZ）发布的GRACE/GRACE-FO第六版时变重力场，以及MPIOM海洋模式的输出结果。已恢复使用ICE-6G冰盖历史的A等人2013年研究中的GIA估计值。
<em>GFZ_RL06_MPIOM_SLF_iter_wSLR21_wSLR22.txt</em>：采用自洽迭代地心解算得到的月度地心估计值，该解算纳入了自吸引与负荷效应。计算所用数据来自德国地球科学研究中心（GFZ）发布的GRACE/GRACE-FO第六版时变重力场，以及MPIOM海洋模式的输出结果。其中，由GRACE/GRACE-FO导出的形状轴谐波项C₂,₁、S₂,₁与方位相关性谐波项C₂,₂、S₂,₂已替换为美国国家航空航天局戈达德航天飞行中心（GSFC）布莱恩特·卢米斯（Bryant Loomis）提供的卫星激光测距（Satellite Laser Ranging, SLR）数据。已恢复使用ICE-6G冰盖历史的A等人2013年研究中的GIA估计值。
<em>GFZ_RL06_MPIOM_SLF_iter_wAOD.txt</em>：采用自洽迭代地心解算得到的月度地心估计值，该解算纳入了自吸引与负荷效应。计算所用数据来自德国地球科学研究中心（GFZ）发布的GRACE/GRACE-FO第六版时变重力场，以及MPIOM海洋模式的输出结果。已恢复使用第五版大气与海洋去混叠（AOD）产品，同时已恢复使用ICE-6G冰盖历史的A等人2013年研究中的GIA估计值。
<em>JPL_RL06_MPIOM_SLF_iter.txt</em>：采用自洽迭代地心解算得到的月度地心估计值，该解算纳入了自吸引与负荷效应。计算所用数据来自喷气推进实验室（Jet Propulsion Laboratory, JPL）发布的GRACE/GRACE-FO第六版时变重力场，以及MPIOM海洋模式的输出结果。已恢复使用ICE-6G冰盖历史的A等人2013年研究中的GIA估计值。
<em>JPL_RL06_MPIOM_SLF_iter_wAOD.txt</em>：采用自洽迭代地心解算得到的月度地心估计值，该解算纳入了自吸引与负荷效应。计算所用数据来自喷气推进实验室（JPL）发布的GRACE/GRACE-FO第六版时变重力场，以及MPIOM海洋模式的输出结果。已恢复使用第六版大气与海洋去混叠（AOD）产品，同时已恢复使用ICE-6G冰盖历史的A等人2013年研究中的GIA估计值。

<strong>数据集说明：</strong>
数据格式：(f11.4,3e20.12,i4)

<strong>数据列说明：</strong>
mid-epoch_time：各测量历元的中间时刻，以十进年份表示
C10：阶数1、阶次0的完全归一化余弦系数
C11：阶数1、阶次1的完全归一化余弦系数
S11：阶数1、阶次1的完全归一化正弦系数
month：各测量历元对应的GRACE/GRACE-FO月份（起始时间为2002-01-01）

<strong>参考文献：</strong>
T. C. Sutterley与I. Velicogna. 《基于时变重力与海洋模式输出的地心变异性改进估计》，《遥感》（Remote Sensing），11(2108)，2019年。

<strong>免责声明：</strong>
本数据集并非由大学空间研究协会（USRA）、德克萨斯大学空间研究中心（UTCSR）、喷气推进实验室（JPL）、德国地球科学研究中心（GFZ）或美国国家航空航天局（NASA）赞助或维护。本数据集以知识共享4.0（Creative Commons 4.0）许可协议发布，但不提供任何形式的担保。