Time-dependent global gravity field models are available nowadays. The paper introduces an approach to generate geopotential earth models similar to GRACE models using such time-dependent global gravity field models. Such GRACE-similar models can then be used to estimate, for example, the Terrestrial Water Storage (TWS) for the months where GRACE data are not available. The paper gives the necessary derivation of such GRACE-similar models from the time-dependent global gravity field models. GRACE-similar models, created by using the time-dependent global gravity field models at the same months where GRACE data are available, are compared to the original GRACE models both in the frequency and the space domains. The results proved that the GRACE-similar models give comparable values to the original GRACE models and no loss of spectrum power occurs.

随时间变化的全球重力场模型现在可用。本文介绍了一种使用与时间相关的全球重力场模型来生成类似于GRACE模型的地势地球模型的方法。然后，可以使用此类GRACE相似的模型来估算例如GRACE数据不可用的月份的陆地储水量（TWS）。本文从依赖于时间的全局重力场模型中给出了此类GRACE相似模型的必要推导。通过在可获得GRACE数据的同一个月中使用时间相关的全球重力场模型创建的GRACE相似模型，在频域和空域上均与原始GRACE模型进行了比较。结果证明，GRACE相似模型可以提供与原始GRACE模型相当的值，并且不会发生频谱功率损失。