| dc.description.abstract | Convective system plays an important role in the global climate, including hydrological cycle, radiative budget and vertical energy transportation. It is usually associated with severe weather hazards, particularly deep convective clouds. Due to the fast development and short lifecycle, it is hard to understand the characteristics of convections. The research studies development of the deep convective cloud in South China Sea (SCS) and Taiwan during June 2017 from high spatial-temporal geostationary satellite Himawari-8. We track and select convective cases by detecting minimum brightness temperature from 11 µm infrared channel as the cumulus center. Besides, to investigate the difference in the characteristics of the cloud top from generation to mature, we could separate developing convective lifetime into three stages, including Pre-CI, CI and mature stages by using convective initiation signal.
The cloud top vertical velocities (CTW) estimated by calculating the change of the cloud top height (CTH) are found to be clustered 0-4m s -1 and could reach more than 10 m s -1. Besides, the value of CTW tends to increase with height when CTH below 10 km. On the mature stage, no matter in SCS or Taiwan, the frequency of large value of CTW is highest. The cloud optical thickness (COT) is mainly distributed between 0-20, and with the increase of CTH, the higher occurrence frequency shows lower value of COT. Compared in Taiwan, the higher value of COT (> 30) occurs frequently in SCS. Furthermore, the cloud effective radius (Re) is mainly distributed between 20-30 µm. When the CTH is lower than 8 km, the Re in SCS would be larger than in Taiwan, and on mature stage, the Re decreases with development of CTH. In Taiwan, the larger Re more than 60 µm is frequently. Further analysis, the stronger the CTW, it is hard for convective clouds to develop larger COT and RE. | en_US |