JPL GRACE and GRACE-FO Mascon Ocean, Ice, and Hydrology Equivalent Water Height JPL Release 06.3 Version 04

This dataset contains gridded monthly global water storage/height anomalies relative to a time-mean, derived from GRACE and GRACE-FO and processed at JPL using the Mascon approach (RL06.3Mv04). These data are provided in a single data file in netCDF format, and can be used for analysis for ocean, ice, and hydrology phenomena. The data are provided in a single data file in netCDF format, with water storage/height anomalies in equivalent water thickness units (cm). The data are derived from solving for monthly gravity field variations on geolocated spherical cap mass concentration functions, rather than global spherical harmonic coefficients. Additionally, realistic geophysical information is introduced during the computation to intrinsically remove correlated errors. Thus, these Mascon grids do not need to be de-correlated or smoothed, like traditional spherical harmonic gravity solutions. The complete Mascon solution consists of 4,551 independent estimates of surface mass change that have been derived using an equal-area 3-degree grid of individual mascons. Please note that this dataset does not correct for leakage errors across coastlines; it is therefore recommended only for users who want to apply their own algorithm to separate between land and ocean mass very near coastlines. This RL06.3Mv04 is an updated version of the previous Tellus JPL Mascon RL06.1Mv03. For more information, please visit https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/. For a detailed description on the Mascon processing, including the mathematical derivation, implementation of geophysical constraints, and validation, please see Watkins et al., 2015, doi: 10.1002/2014JB011547. This product is intended for expert use only; other users are encouraged to use the CRI-filtered Mascon dataset, which is available here: https://podaac.jpl.nasa.gov/dataset/TELLUS_GRAC-GRFO_MASCON_GRID_RL06.3_V4.

本数据集包含相对于时间平均值的网格化全球逐月水储量/水位异常数据，其源自重力恢复与气候实验（GRACE）及GRACE后续任务（GRACE-FO），由美国喷气推进实验室（Jet Propulsion Laboratory, JPL）采用质量集中（Mass Concentration, Mascon）方法处理，版本号为RL06.3Mv04。本数据集以单份netCDF格式数据文件提供，数据单位为等效水厚度（厘米，cm），可用于海洋、冰盖与水文现象的相关分析。该数据通过求解地理定位的球帽质量集中函数的逐月重力场变化得到，而非采用全球球谐系数。此外，计算过程中引入了真实地球物理信息，以从本质上消除相关误差。因此，此类Mascon网格无需像传统球谐重力解那样进行去相关或平滑处理。完整的Mascon解包含4551个独立的地表质量变化估算值，这些估算值由等面积3度网格的单个质量集中块生成。请注意，本数据集未针对海岸线周边的泄漏误差进行校正，因此仅建议希望自行开发算法分离近岸陆地与海洋质量的用户使用。本次发布的RL06.3Mv04是此前Tellus JPL Mascon RL06.1Mv03的更新版本。如需获取更多信息，请访问：https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/。如需了解Mascon处理的详细说明（包括数学推导、地球物理约束的实现与验证方法），请参阅Watkins等人2015年发表的文献，DOI：10.1002/2014JB011547。本产品仅面向专业用户开放；其他用户建议使用经过CRI滤波的Mascon数据集，其获取链接为：https://podaac.jpl.nasa.gov/dataset/TELLUS_GRAC-GRFO_MASCON_GRID_RL06.3_V4。