Analysis of Mesoscale Convective Complex during Madden Julian Oscillation Phase 4 (Case Study: Heavy rain in Cilacap on Sept 16-17, 2016)

International Conference On Tropical Meteorology And Atmospheric Sciences

生态环境科学;原子能学

Aiqiu, L.F.^1 ; Zakir, A.^2 ; Trismidianto^3

Undergraduate Program of Meteorology, State College of Meteorology, Climatology and Geophysics, Jakarta, Indonesia^1

Department of Meteorology, State College of Meteorology, Climatology and Geophysics, Jakarta, Indonesia^2

Center for Atmospheric Science and Technology, National Institute of Aeronautics and Space, Bandung, Indonesia^3

关键词: Extreme rainfall;    GSMaP;    Infrared satellites;    Madden-Julian oscillation;    Mesoscale convective complexes;    Observation data;    Rainfall intensity;    Vertical velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/303/1/012063/pdf
DOI  :  10.1088/1755-1315/303/1/012063

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

This research aims to analyze the heavy rain which accompanied by severe winds, caused floods and landslides in several of sub-districts in Cilacap, Central Java on 16-17 September 2016 that coincides with the phase 4 of Madden Jullian Oscillation (MJO) event. In the same time, also found a Mesoscale Convective Complex (MCC) in the around Central Java. MCCs were identified by infrared satellite imagery from Himawari 8 using an algorithm that combines criteria of cloud coverage, eccentricity, and cloud lifetime. The data used is a combination of observation data, satellite data and reanalysis data. This study results that there is an increase in vertical velocity accompanied by strong negative vorticity since the development of MCC until it reached its mature phase, then the vertical velocity decreases as the cloud systems disseminated. These results indicate there is the evolution of MCC convective cells from growth until dissipation. Throughout its lifetime the MCC system moves south-east into the Indian Ocean and is decapitated there. Based on GSMaP rainfall data it was observed that in Central Java area especially Cilacap area has extreme rainfall which caused by MCC activity. The influence of MCC on significant rainfall is also supported by the existence of MJO phase 4. The significant increase in rainfall when phase 4 active MJO is followed by the MCC. The value of rainfall intensity when MJO followed by the presence of MCC is greater than in the absence of MCC.