Geocenter Estimates from Time-Variable Gravity and Ocean Model Outputs

<b>Last Updated: 2020-01-28</b><b><br></b><b>File descriptions:</b><br><i>CSR_RL05_OMCT_SLF_iter.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE Release-5 time-variable gravity fields from the University of Texas Center for Space Research (CSR) and outputs from the OMCT ocean model. ECMWF corrections from Fagiolini et al. (2015) have been restored. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored.<br><i>CSR_RL05_OMCT_SLF_iter_wAOD.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE Release-5 time-variable gravity fields from the University of Texas Center for Space Research (CSR) and outputs from the OMCT 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><br><i>CSR_RL06_MPIOM_SLF_iter.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE 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><i>CSR_RL06_MPIOM_SLF_iter_wAOD.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE 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><br><i>GFZ_RL05_OMCT_SLF_iter.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE Release-5 time-variable gravity fields from the German Center for Geosciences (GeoForschungsZentrum, GFZ) and outputs from the OMCT ocean model. ECMWF corrections from Fagiolini et al. (2015) have been restored. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored.<br><i>GFZ_RL05_OMCT_SLF_iter_wAOD.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE Release-5 time-variable gravity fields from the German Center for Geosciences (GeoForschungsZentrum, GFZ) and outputs from the OMCT 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><br><i>GFZ_RL06_MPIOM_SLF_iter.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE 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><i>GFZ_RL06_MPIOM_SLF_iter_wAOD.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE 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><br><i>JPL_RL05_OMCT_SLF_iter.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE Release-5 time-variable gravity fields from the Jet Propulsion Laboratory (JPL) and outputs from the OMCT ocean model. ECMWF corrections from Fagiolini et al. (2015) have been restored. Glacial Isostatic Adjustment (GIA) estimates from A et al. (2013) with ICE-6G ice history have been restored.<br><i>JPL_RL05_OMCT_SLF_iter_wAOD.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE Release-5 time-variable gravity fields from the Jet Propulsion Laboratory (JPL) and outputs from the OMCT 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><i>JPL_RL06_MPIOM_SLF_iter.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE 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><i>JPL_RL06_MPIOM_SLF_iter_wAOD.txt</i>Monthly geocenter estimate calculating using a self-consistent, iterated geocenter solutions incorporating self-attraction and loading effects. Calculated using GRACE 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><b>Data Descriptions:</b>Data format:(f11.4,3e20.12,i4)<br><b>Data columns:</b>mid-epoch_time: mid-date of each measurement epoch in decimal-yearsC10: fully normalized cosine coefficient for degree 1 and order 0C11: fully normalized cosine coefficient for degree 1 and order 1S11: fully normalized sine coefficient for degree 1 and order 1month: GRACE month of each measurement epoch (months starting 2002-01-01)<br><br><b>Reference:</b>T. C. Sutterley and I. Velicogna. Improved Estimates of Geocenter Variability from Time-Variable Gravity and Ocean Model Outputs. <i>Remote Sensing</i>, 11(2108), 2019. https://doi.org/10.3390/rs11182108<br>

**最后更新：2020-01-28**

**文件说明：**
*CSR_RL05_OMCT_SLF_iter.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。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）的GRACE RL05时变重力场，以及OMCT海洋模式的输出结果。已恢复应用Fagiolini等人2015年提出的ECMWF修正项，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（Glacial Isostatic Adjustment, GIA）估计值。

*CSR_RL05_OMCT_SLF_iter_wAOD.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。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）的GRACE RL05时变重力场，以及OMCT海洋模式的输出结果。已恢复应用RL05版本的大气与海洋去混叠（atmospheric and oceanic de-aliasing, AOD）产品，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*CSR_RL06_MPIOM_SLF_iter.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。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）的GRACE RL06时变重力场，以及MPIOM海洋模式的输出结果。已纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*CSR_RL06_MPIOM_SLF_iter_wAOD.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。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）的GRACE RL06时变重力场，以及MPIOM海洋模式的输出结果。已恢复应用RL06版本的大气与海洋去混叠（AOD）产品，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*GFZ_RL05_OMCT_SLF_iter.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。计算所用数据来自德国地学研究中心（German Center for Geosciences, GeoForschungsZentrum, GFZ）的GRACE RL05时变重力场，以及OMCT海洋模式的输出结果。已恢复应用Fagiolini等人2015年提出的ECMWF修正项，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*GFZ_RL05_OMCT_SLF_iter_wAOD.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。计算所用数据来自德国地学研究中心（German Center for Geosciences, GeoForschungsZentrum, GFZ）的GRACE RL05时变重力场，以及OMCT海洋模式的输出结果。已恢复应用RL05版本的大气与海洋去混叠（AOD）产品，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*GFZ_RL06_MPIOM_SLF_iter.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。计算所用数据来自德国地学研究中心（German Center for Geosciences, GeoForschungsZentrum, GFZ）的GRACE RL06时变重力场，以及MPIOM海洋模式的输出结果。已纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*GFZ_RL06_MPIOM_SLF_iter_wAOD.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。计算所用数据来自德国地学研究中心（German Center for Geosciences, GeoForschungsZentrum, GFZ）的GRACE RL06时变重力场，以及MPIOM海洋模式的输出结果。已恢复应用RL05版本的大气与海洋去混叠（AOD）产品，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*JPL_RL05_OMCT_SLF_iter.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。计算所用数据来自喷气推进实验室（Jet Propulsion Laboratory, JPL）的GRACE RL05时变重力场，以及OMCT海洋模式的输出结果。已恢复应用Fagiolini等人2015年提出的ECMWF修正项，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*JPL_RL05_OMCT_SLF_iter_wAOD.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。计算所用数据来自喷气推进实验室（Jet Propulsion Laboratory, JPL）的GRACE RL05时变重力场，以及OMCT海洋模式的输出结果。已恢复应用RL05版本的大气与海洋去混叠（AOD）产品，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*JPL_RL06_MPIOM_SLF_iter.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。计算所用数据来自喷气推进实验室（Jet Propulsion Laboratory, JPL）的GRACE RL06时变重力场，以及MPIOM海洋模式的输出结果。已纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

*JPL_RL06_MPIOM_SLF_iter_wAOD.txt*：本文件存储月度地心估计值，采用自洽迭代地心解算方案生成，纳入自吸引与负载效应。计算所用数据来自喷气推进实验室（Jet Propulsion Laboratory, JPL）的GRACE RL06时变重力场，以及MPIOM海洋模式的输出结果。已恢复应用RL06版本的大气与海洋去混叠（AOD）产品，同时纳入基于ICE-6G冰盖历史、由A等人2013年发布的冰川均衡调整（GIA）估计值。

**数据说明：**
数据格式：(f11.4,3e20.12,i4)
**数据列说明：**
mid-epoch_time：各测量历元的中间时刻，以小数年份格式表示
C10：阶数1、次阶0的完全归一化余弦系数
C11：阶数1、次阶1的完全归一化余弦系数
S11：阶数1、次阶1的完全归一化正弦系数
month：各测量历元对应的GRACE月份（计数起始于2002年1月1日）

**参考文献：**
T. C. Sutterley与I. Velicogna. 《基于时变重力与海洋模式输出的改进地心变异性估计》，*Remote Sensing（遥感）*，11(2108)，2019. https://doi.org/10.3390/rs11182108