Abstract In 2017 and 2018 GFZ performed two gravimetry campaigns on commercial ferries in the Baltic Sea. The nature of such “non-dedicated” campaigns is different from “dedicated” campaigns that are performed on research vessels with tracks planned according to gravity measurement needs. The non-dedicated campaigns use non-survey vessels or survey vessels running for other purposes such as hydrographic measurements, which may require additional corrections. To assess the usefulness of non-dedicated campaigns, we analysed gravity measurements collected on two commercial ferries as part of the EU funded FAMOS project. Besides the typical marine gravimetry corrections, we also investigated the corrections for the vertical accelerations due to the ship’s movement and the dynamical effect due to the cross-coupling between horizontal and vertical acceleration components. Taking the latter two corrections into account partly leads to slight improvements, but our results also demonstrate that the standard processing without the two corrections, as used in most of the dedicated campaigns, already delivers good quality end products that fulfil the requirements of a typical marine gravimetry survey with an uncertainty of about 1 mGal. Our findings suggest that gravimetry campaigns on commercial ferries can be used to complement dedicated marine gravimetry campaigns and contribute to geodetic purposes.

中文翻译：

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波罗的海商业渡轮航线上的重力测量及其用于大地测量的用途

摘要 2017 年和 2018 年，GFZ 在波罗的海的商业渡轮上进行了两次重力测量活动。这种“非专用”活动的性质不同于在研究船上进行的“专用”活动，其轨道根据重力测量需要进行规划。非专用活动使用非调查船或为其他目的运行的调查船，例如水文测量，这可能需要额外的修正。为了评估非专用活动的有用性，我们分析了在两艘商业渡轮上收集的重力测量结果，作为欧盟资助的 FAMOS 项目的一部分。除了典型的海洋重力校正，我们还研究了由于船舶运动引起的垂直加速度的修正以及由于水平和垂直加速度分量之间的交叉耦合引起的动力效应。将后两个修正部分考虑在内会导致轻微的改进，但我们的结果还表明，大多数专用活动中使用的没有这两个修正的标准处理已经提供了满足典型船舶要求的高质量最终产品。重力测量的不确定性约为 1 mGal。我们的研究结果表明，商业渡轮上的重力测量活动可用于补充专门的海洋重力测量活动并有助于大地测量目的。但我们的结果也表明，在大多数专用活动中使用的没有两次校正的标准处理已经提供了高质量的最终产品，满足典型海洋重力测量的要求，不确定性约为 1 mGal。我们的研究结果表明，商业渡轮上的重力测量活动可用于补充专门的海洋重力测量活动并有助于大地测量目的。但我们的结果也表明，在大多数专用活动中使用的没有两次校正的标准处理已经提供了高质量的最终产品，满足典型海洋重力测量的要求，不确定性约为 1 mGal。我们的研究结果表明，商业渡轮上的重力测量活动可用于补充专门的海洋重力测量活动并有助于大地测量目的。