An unexpected VLBI scale drift has been observed in the latest realization of the ITRS, ITRF2020, beginning shortly after epoch 2013.75 and continuing through 2021.0. A detailed analysis of the station motion model for NYALES20 (Svalbard, Norway) revealed a linear increase in station height during this period, attributed to present-day ice mass loss, perfectly aligning with the observed VLBI scale drift. The present study investigates the impact of an updated station discontinuity model for NYALES20 on determining the VLBI scale. Check it out!
