JPL TELLUS GRACE Level-3 Monthly LAND Water-Equivalent-Thickness Surface-Mass Anomaly Release 6.0 in netCDF/ASCII/GeoTIFF Formats

The JPL monthly land mass grids contain land water mass anomaly given as equivalent water thickness derived from GRACE time-variable gravity observations during the specified timespan in ASCII/netCDF/GeoTIFF formats. The Equivalent water thickness represents the total terrestrial water storage anomalies from soil moisture, snow, surface water (incl. rivers, lakes, reservoirs etc.), as well as groundwater and aquifers. The time coverage for the monthly grids are determined by GRACE months ( https://podaac-tools.jpl.nasa.gov/drive/files/allData/tellus/L3/docs/GraceMonths.html ). A glacial isostatic adjustment correction has been applied, and standard corrections for geocenter (degree-1) and C20 (degree-20) are incorporated. Post-processing filters have been applied to reduce correlated errors. From the RL06 version, all GRACE products in the ASCII format have adopted the YAML encoding header, which is in compliance with the PO.DAAC metadata best practice.

JPL每月陆地网格数据集包含了在指定时间段内，由GRACE时间可变重力观测得出的等效水厚度所表示的陆地水体异常。等效水厚度代表了来自土壤湿度、积雪、地表水体（包括河流、湖泊、水库等）、地下水以及含水层中总陆地水储存异常。月度网格的时间覆盖范围由GRACE月份确定（https://podaac-tools.jpl.nasa.gov/drive/files/allData/tellus/L3/docs/GraceMonths.html）。数据中已应用冰川同化调整校正，并纳入了地心（一阶）和C20（二十阶）的标准校正。为减少相关误差，已应用后处理滤波器。自RL06版本起，所有ASCII格式的GRACE产品均采用了YAML编码头，符合PO.DAAC元数据最佳实践。