###### Abstract  
Our study analyzed the occurrence frequency and distribution of seedable clouds around the Korean Peninsula in order to better secure water resources. Cloud products from the Communication, Ocean, and Meteorological Satellite (COMS), including cloud fraction, cloud top height, cloud top temperature, cloud phase, cloud top pressure, cloud optical thickness, and rainfall intensity, were used. Daytime hourly data between 0900 and 1800 local standard time (LST) observed from December 2016 to November 2019 was used. Seedable clouds occurring within this period were evaluated based on seasonal cloud phases, occurrence frequency, and cloud characteristics according to land, sea, and cloud type. These clouds exhibited varying average occurrence frequencies in different seasons. Sc (stratocumulus) clouds exhibited the highest occurrence frequency for all seasons, with an average of 63%, followed by Cu (cumulus) at 15%, As (altostratus) at 13%, and Ac (altocumulus) at 6%. We determined that low-level clouds primarily occurred around the Korean Peninsula, and the occurrence frequency of stratiform clouds was highest for water phase seedable clouds, while the occurrence frequency of cumuliform clouds was highest for ice phase seedable clouds. We believe that precipitation enhancement experiments could be suitable for western and eastern seas around the Korean Peninsula as well as for mountainous regions on land. water resource; Korean Peninsula; seedable cloud; occurrence frequency; Communication Ocean and Meteorological Satellite (COMS) 20  
The rapid urbanization and industrialization of South Korea have continuously increased water demand, leading to rising concerns about future water resources. Dam construction can be the most effective measure for securing water resources, but can also lead to environmental issues, such as alterations to the surrounding terrain and environment and the destruction of ecosystems in submerged areas. Additionally, it can cause economic problems. A variety of alternative water resources are available, including groundwater, riverside filtered water, desalination, deep ocean water, and precipitation enhancement experiments. Currently, researchers are considering precipitation enhancement experiments as the preferable measure to minimize environmental problems and secure water resources at a relatively low cost [9; 10]. A precipitation enhancement experiment involves implementing artificial microphysical processes in clouds with low precipitation probability or low precipitation efficiency to induce precipitation [11]. Precipitation enhancement experiments are usually conducted by aircraft but can also be performed on the ground. Weather modification experiments for precipitation enhancement are being developed and put to practical use worldwide, and they have shown numerous economic benefits [12; 13; 14]. The United States, China, Thailand, and Australia have conducted long-term precipitation enhancement experiments using aircraft. Researchers from these countries have reported statistical annual increases in precipitation in these experiments [15; 16; 17; 18; 19]. In South Korea, precipitation enhancement experiments have promised high economic savings, including an annual KRW 22,500 million from forest fire prevention, KRW 28,500 million from a reduction in drought damage, and KRW 350 million from securing water resources in dam watershed areas [20]. The Korea Meteorological Administration (KMA) first conducted precipitation enhancement experiments for weather modification in 1963. This was subsequently discontinued due to budgetary constraints before being restarted in 1995 due to severe droughs. Prior to the introduction of the KMA/NIMS (National Institute of Meteorological Sciences) Atmospheric Research Aircraft (NARA) in November 2017, 53 precipitation enhancement experiments had been conducted using civilian aircraft from 1995 to 2017. Subsequently, 12 experiments were conducted in 2018 and 15 were conducted in 2019.