Abstract: To meet the requirements of ubiquitous coverage in sixth-generation mobile communication (6G), the space-air-ground-sea integrated network (SAGSIN) has emerged as a key enabling technology, making research on air-sea channel characteristics of significant importance. To reveal the propagation mechanisms of air-sea communication links, this paper focuses on two typical dynamic air-sea channel scenarios. A time-domain channel measurement platform was employed to conduct measurements campaign in the 2 GHz frequency band, followed by extraction and characteristic analysis of large-scale and small-scale channel parameters. The analysis results show that the measured path loss is close to the free-space path loss. The small-scale fading envelope is best fitted by the Rician distribution, verifying that the air-sea wireless channel is dominated by a strong line-of-sight (LoS) path. Comparison between the Doppler shift of the main path and the mean Doppler shift at corresponding instants reveals that the main path Doppler shift has a decisive influence on the mean Doppler shift. The Doppler spread is best fitted by the Gamma distribution, with relatively small mean and standard deviation values indicating low frequency dispersion and limited multipath components in the air-sea channel.