| Abstrakt: |
Knowledge of cloud vertical structure (CVS) is essential for increasing our understanding of atmospheric circulation because cloud influences atmospheric circulation, the Earth's hydrological cycle, and the energy budget. Some critical parameters related to this are cloud base height, cloud top height, cloud thickness, and the number of cloud layers. This study aims to analyze the effect of diurnal variation on the vertical structure of clouds in Sumatra. This study analyzed data for two periods of Coupling Processes in the Equatorial Atmosphere (CPEA), namely CPEA-I (April-May 2004) and CPEA-II (November-December 2005). During CPEA-I and II, a total of 136 and 266 radiosondes were launched, respectively. Of this number, during CPEA I (II), the occurrence frequency of single, two, three, four layers clouds were observed 25.49% (21.11%), 31.37% (28.14%), 24.50% (22.96%), 10.78 % (15.92%), respectively. Furthermore, the cloud percentage with more than four layers during CPEA-I and II is 7.84% and 11.85%, respectively. Thus, the cloud's occurrence percentage for all layers was higher during CPEA-I, except for a cloud with more than four layers. Clouds that appear in the morning (00-11 LST) have lower cloud vertical structure parameters than clouds that appear at 12-23 LST. Thus, the cloud formation process is different between morning, afternoon, and evening, resulting in different vertical cloud structures. [ABSTRACT FROM AUTHOR] |
