Since June, 2018, the Gravity Recovery and Climate Experiment Follow‐On (GRACE‐FO) is extending the 15‐year monthly mass change record of the GRACE mission, which ended in June 2017. The GRACE‐FO instrument and flight system performance has improved over GRACE. Better attitude solutions and enhanced pointing performance result in reduced fuel consumption and gravity range rate post‐fit residuals. One accelerometer requires additional calibrations due to unexpected measurement noise. The GRACE‐FO gravity and mass change fields from June 2018 through December 2019 continue the GRACE record at an equivalent precision and spatiotemporal sampling. During this period, GRACE‐FO observed large interannual terrestrial water variations associated with excess rainfall (Central US, Middle East), drought (Europe, Australia), and ice melt (Greenland). These observations are consistent with independent mass change estimates, providing high confidence that no intermission biases exist from GRACE to GRACE‐FO, despite the 11‐month gap. GRACE‐FO has also successfully demonstrated satellite‐to‐satellite laser ranging interferometry.

中文翻译：

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扩展全球质量变化数据记录：GRACE后续仪器和科学数据性能

自2018年6月以来，重力恢复和气候实验后续措施（GRACE-FO）延长了GRACE任务的15年每月质量变化记录，该记录于2017年6月结束。GRACE-FO仪器和飞行系统的性能比GRACE有所改进。更好的姿态解决方案和增强的指向性能可减少燃油消耗和重力范围比率拟合后残差。由于意外的测量噪声，一种加速度计需要进行额外的校准。从2018年6月到2019年12月，GRACE-FO重力和质量变化场以相同的精度和时空采样继续了GRACE记录。在此期间，GRACE-FO观测到年际陆地水的变化很大，这与降雨过多（美国中部，中东），干旱（欧洲，澳大利亚）和冰融化（格陵兰）有关。这些观察结果与独立的质量变化估计值一致，从而提供了高信度，尽管有11个月的间隔，但从GRACE到GRACE-FO不存在间歇性偏差。GRACE-FO还成功展示了卫星到卫星激光测距干涉仪。