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Regional gravity variations in Europe from superconducting gravimeters

机译：欧洲超导重力仪的区域重力变化

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Recent satellite missions (CHAMP, GRACE) are now returning data on the time variation of the gravity field with harmonic coefficients computed every 4 weeks, The promise is to achieve a sub-microgal accuracy that will define continental mass variations involving large-scale hydrology. With this in mind, we examine the time varying gravity field over central Europe using a limited number of high quality ground-based superconducting gravimeter stations within the Global Geodynamics Project (GGP). Our purpose is to see whether there are coherent signals between the individual stations and to compare the regional component with that predicted from models of continental hydrology. The results are encouraging. We have found, using empirical orthogonal eigenfunctions of the gravity data that a clear annual signal is present that is consistent in phase (low amplitudes in summer) and amplitude (1-3 microgal) with that determined from a large-scale model of land water in connection with global climate modeling. More work is required to define how the gravity field is related to large-scale soil moisture and other mass variations, and we have yet to compare our results to the latest satellite-derived data.
机译：最近的卫星飞行任务（CHAMP，GRACE）现在返回重力场时间变化的数据，并每4周计算一次谐波系数。有望实现亚微gal精度，这将定义涉及大规模水文学的大陆质量变化。考虑到这一点，我们在全球地球动力学项目（GGP）中使用有限数量的高质量地面超导重力仪站来研究中欧随时间变化的重力场。我们的目的是查看各个站点之间是否存在相干信号，并将区域成分与根据大陆水文学模型预测的成分进行比较。结果令人鼓舞。我们发现，利用重力数据的经验正交本征函数，可以得出清晰的年度信号，该信号在相位（夏季低振幅）和振幅（1-3微加仑）方面与从大规模地下水模型确定的信号一致与全球气候模拟有关。需要做更多的工作来确定重力场与大规模土壤湿度和其他质量变化之间的关系，我们还没有将结果与最新的卫星数据进行比较。

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