We conducted gravity observations in Antarctica at Jang Bogo Station (JBS) during the 2019–2020 Austral summer season using an FG5-210 absolute gravimeter (AG) and a LaCoste & Romberg (LCR) Model D-58 relative gravimeter. Absolute gravity measurements were successfully made at reference gravity point JBSAG1 and newly established gravity point JBSAG2, yielding about 19,000 and 14,400 drops of data, respectively, with measurement precisions better than 0.4 μGal (1 μGal = 10⁻⁸ m s⁻²). In addition, relative gravity measurements were conducted at 10 other newly established gravity points, with accuracies better than 10 μGal, to supplement the absolute gravity data. Superconducting gravimeter (SG) observation with an iGrav-021 instrument has been underway at JBS since 2016. Since an SG is a relative gravimeter, the calibration of the scale factor is essential for long-term gravity monitoring. In addition, the D-58 instrument was required for scale factor calibration. To calibrate the scale factors of these gravimeters, we first estimated a value for the iGrav-021 using parallel observations with the FG5-210 instrument. The D-58 scale factor was then estimated indirectly from parallel observations with the iGrav-021. These calibrations should ensure accurate gravity monitoring in future work.

我们使用 FG5-210 绝对重力仪 (AG) 和 LaCoste & Romberg (LCR) D-58 型相对重力仪在 2019-2020 年南极夏季期间在 Jang Bogo 站 (JBS) 进行了重力观测。在参考重力点JBSAG1和新建立的重力点JBSAG2成功进行绝对重力测量，分别产生约19,000和14,400滴数据，测量精度优于0.4 μGal（1 μGal = 10 ^-8  m s ^-2）。此外，在另外10个新建立的重力点进行了相对重力测量，精度优于10 μGal，以补充绝对重力数据。自 2016 年以来，JBS 一直在使用 iGrav-021 仪器进行超导重力仪 (SG) 观测。由于 SG 是相对重力仪，因此比例因子的校准对于长期重力监测至关重要。此外，比例因子校准需要 D-58 仪器。为了校准这些重力仪的比例因子，我们首先使用 FG5-210 仪器的平行观测估计 iGrav-021 的值。然后通过 iGrav-021 的平行观测间接估计 D-58 比例因子。这些校准应确保在未来的工作中进行准确的重力监测。