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Analysis of non-tidal ocean loading for gravitational potential observations in northern Europe

机译：北欧非潮汐海洋负荷引力潜力分析

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摘要

With the progress in clock technology heading towards a relative clock accuracy of 10(-18), geodetic applications become feasible, such as determining gravity potential differences over large distances at the level of 0.1 m(2) s(-2). In this context, the effect of temporal gravity field variations on the new observable has to be considered. This paper studies non-tidal ocean loading effects on the gravitational potential around the North Sea with respect to signal strength and temporal behavior. Ten years of gravitational potential variations caused by non-tidal ocean loading are calculated for five locations in Germany and France using the Green's function approach. The potential variations are discussed with respect to a static gravity field, the effect of different measurement durations and the differences between two locations. The gravitational potential variations reach values of 0.2-0.5 m(2) s(-2) in coastal areas and decrease with increasing distance from the coast. Analyzing the potential variations for increasing measurement durations from 1 h to 48 h shows a decrease in magnitude. All investigated locations are strongly correlated. They differ mostly due to different magnitudes of the gravitational potential variations.
机译：随着时钟技术的进步，相对时钟精度达到10（-18），大地测量应用变得可行，例如确定大距离上的重力势差在0.1 m（2）s（-2）的水平上。在这种情况下，必须考虑时间重力场变化对新观测值的影响。本文研究了非潮汐海洋负荷对北海周围重力的影响，涉及信号强度和时间行为。使用格林函数方法，对德国和法国的五个位置计算了由非潮汐海洋载荷引起的十年重力势变化。针对静态重力场，不同测量持续时间的影响以及两个位置之间的差异讨论了电位变化。重力势能变化在沿海地区达到0.2-0.5 m（2）s（-2）的值，并随着与海岸距离的增加而减小。分析将测量持续时间从1 h增加到48 h的潜在变化表明幅度减小。所有调查的位置都紧密相关。它们的不同主要是由于引力电势变化的大小不同。

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