The structural changes at the planetary boundary layer (PBL) top are very complex and closely related to climate and environmental changes. With the development of Global Navigation Satellite System Radio Occultation (GNSS RO), it provides a good opportunity to estimate and study PBL variations. In this paper, long-term variations and structures of planetary boundary layer height (PBLH) from 2008 to 2022 are investigated by the Wavelet Covariance Transform (WCT) method based on refractivity profiles from Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) and Korea Multi-purpose Satellite-5 (KOMPSAT-5). Furthermore, the temperature and pressure of PBL top are detected using the temperature and pressure profiles from COSMIC and KOMPSAT-5 occultation data. The results demonstrate the latitudinal distribution of the PBL top height, temperature, and pressure, with the more apparent temperature's latitudinal characteristics. The pressure is more strongly correlated with PBL height than temperature. The PBL height in most land and oceans is high in summer and low in winter, and the PBL pressure is low in summer and high in winter, according to seasonal variation characteristics. The global PBL temperature is high in summer and low in winter, which is more obvious in high latitude region. A positive correlation between latitude and the magnitude of seasonal variation in PBL temperature is observed worldwide. Seasonal variation is less pronounced in the Southern Hemisphere (SH) than in the Northern Hemisphere (NH) due to sea-land differences. The annual average value of the global PBL height, temperature, and pressure do not change significantly over the long term, and also there is no a discernible upward or downward trend.

行星边界层（PBL）顶部的结构变化非常复杂，与气候和环境变化密切相关。随着全球导航卫星系统无线电掩星（GNSS RO）的发展，它为估计和研究PBL变化提供了良好的机会。本文基于气象、电离层和气候星座观测系统（COSMIC）的折射率剖面，采用小波协方差变换（WCT）方法研究了2008年至2022年行星边界层高度（PBLH）的长期变化和结构。 ）和韩国多用途卫星 5 号（KOMPSAT-5）。此外，PBL 顶部的温度和压力是使用 COSMIC 和 KOMPSAT-5 掩星数据的温度和压力剖面来检测的。结果表明，PBL顶高、温度和压力均具有纬度分布，其中温度的纬度特征更为明显。与温度相比，压力与 PBL 高度的相关性更强。大部分陆地和海洋的PBL高度夏季高、冬季低，PBL气压夏季低、冬季高，具有季节变化特征。全球PBL气温夏季高、冬季低，高纬度地区更为明显。在世界范围内观察到纬度与 PBL 温度季节变化幅度之间存在正相关关系。由于海陆差异，南半球 (SH) 的季节变化不如北半球 (NH) 明显。全球PBL高度、温度和压力的年平均值长期变化不大，也没有明显的上升或下降趋势。