The planetary boundary layer (PBL) is the lowest part of the troposphere that is directly influenced by the Earth's surface (Garratt, 1992) . The PBL processes play significant roles in modulating the exchange of momentum, heat, moisture, gases, and aerosols between the Earth's surface and the free troposphere (Hu et al., 2014; Miao et al., 2015) . The PBL height (H) is a crucial parameter that can be used to describe much of the diurnal, synoptic, and climatological processes associated with

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... e PBL in a given region, including its cloud characterization and connections between the surface and free troposphere (Ao et al., 2012) . It is crucial to accurately estimate H through in situ and remote sensing observations, so that the temporal and spatial variations of H can be extensively assessed and analyzed at a regional or national scale. Several ground-based remote sensing instruments (e.g., ceilometer, lidar, sodar, radio acoustic sounding system, and wind profiling radar) have been used to estimate H, which effectively complement the limited spatial and temporal sampling of radionsonde observations (Emeis et al., 2004; Liu et al., 2020; Seibert et al., 2000; Zhang et al., 2016) . Furthermore, the advent of GPS radio occultation (GPSRO) technique offers global PBL sensing with high vertical resolution (∼100 m) and all-weather sounding capability. Numerous studies have demonstrated the advantage of using GPSRO to detect H (e.g.,