CSR TELLUS GRACE-FO Level-3 Monthly Land Water-Equivalent-Thickness Surface Mass Anomaly Release 6.3 version 04

This data set is produced by the Center for Space Research (CSR) GRACE-FO (Gravity Recovery and Climate Experiment Follow-On) program and derives the terrestrial water storage anomaly given as equivalent water thickness. These monthly grids are derived from GRACE-FO time-variable gravity observations during the specified timespan, and relative to the specified time-mean reference period. This quantity represents the total terrestrial water storage anomalies from soil moisture, snow, surface water (incl. rivers, lakes, reservoirs etc.), as well as groundwater and aquifers. A glacial isostatic adjustment (GIA) correction has been applied, and standard corrections for geocenter (degree-1), C20 (degree-20) and C30 (degree-30) are incorporated. Post-processing filters have been applied to reduce correlated errors. Data grids are provided in ASCII/netCDF/GeoTIFF formats. <br><br>

GRACE-FO was launched on 22 May 2018, and extends the original GRACE mission (2002 – 2017) and expands its legacy of scientific achievements in tracking earth surface mass changes. Version 04 (v04) of the terrestrial water storage data uses updated and consistent C20 and Geocenter corrections (i.e., Technical Notes TN-14 and TN-13), as well as an ellipsoidal correction to account for the non-spherical shape of the Earth when mapping gravity anomalies to surface mass change. Additionally, this release 06.3 is an updated version of the Level 3 products in coordination with the release of the analogous Level 2 products used to generate them. It differs from RL06.1 only in the Level-1B accelerometer transplant data that is used for the GF2 (GRACE-FO 2) satellite; see respective L-2 data descriptions. RL06.3 uses the ACX2-L1B data products. All GRACE-FO RL06.3 Level-3 fields are fully compatible with the GRACE RL06 data.

本数据集由空间研究中心（CSR）的GRACE-FO（重力恢复与气候实验后续计划）项目所产出，并从等效水厚度角度获取了地表水储存异常。这些月度网格数据源于GRACE-FO在指定时间段内的时间可变重力观测，并相对于指定的时均参考期进行计算。该量值代表了从土壤湿度、雪、地表水（包括河流、湖泊、水库等）以及地下水和含水层中产生的总地表水储存异常。数据中已应用冰川同化调整（GIA）校正，并纳入了地心（一阶）、C20（二十阶）和C30（三十阶）的标准校正。为降低相关误差，已应用后处理滤波器。数据网格以ASCII、netCDF和GeoTIFF格式提供。

GRACE-FO于2018年5月22日发射，继承了原始GRACE任务（2002-2017）的遗产，并扩展了其追踪地球表面质量变化的科学成就。地表水储存数据版本04（v04）采用了更新和一致的C20和地心校正（即技术笔记TN-14和TN-13），以及椭球校正以考虑地球非球形形状对重力异常映射至表面质量变化的影响。此外，此次发布的06.3版本是 Level 3 产品的更新版，与用于生成它们的类似 Level 2 产品同时发布。它与RL06.1的不同之处在于用于GF2（GRACE-FO 2）卫星的 Level-1B 加速度计移植数据；请参阅相应的 L-2 数据描述。RL06.3使用了ACX2-L1B数据产品。所有GRACE-FO RL06.3 Level-3字段与GRACE RL06数据完全兼容。