An enhanced integrated water vapour dataset from more than 10 000 global ground-based GPS stations in 2020

Abstract. We developed a high-quality global integrated water vapour (IWV) dataset from 12 552 ground-based positioning system (GPS) stations in 2020. It consists of 5 min GPS IWV estimates with total number 1 093 591 492 data points. The completeness rates the are higher than 95 % at 7253 (58 %) stations. is an enhanced version existing operational provided by Nevada Geodetic Laboratory (NGL). enhancement reached employing accurate meteorological information fifth generation European ReAnalysis (ERA5) for retrieval significantly spatiotemporal resolution. A dedicated screening algorithm also implemented. has good agreement situ radiosonde observations 182 collocated worldwide. biases within ±3.0 kg m−2 mean absolute bias (MAB) value 0.69 m−2. standard deviations (SD) differences no larger 3.4 In addition, product shows substantial improvements compared to NGL's version, and it thus recommended high-accuracy applications, such as research extreme weather events diurnal variations intercomparisons other techniques. Taking radiosonde-derived reference, MAB SD reduced 19.5 6.2 on average, respectively. unrealistic negative substantially 92.4 owing zenith hydrostatic delay (ZHD) derived ERA5. available https://doi.org/10.5281/zenodo.6973528 (Yuan et al., 2022).