Comparison and Analysis of The First Signal Detection of Two X-Band Radar with RGB Himawari Satellite Data before Localized Heavy Rain March 17 2017 Bandung Basin Indonesia

International Conference On Tropical Meteorology And Atmospheric Sciences

生态环境科学;原子能学

Nugroho, G.A.^1 ; Sinatra, T.^1 ; Risyanto^1

National Institute of Aeronautics and Space, LAPAN, Indonesia^1

关键词: Comparison and analysis;    Complex topographies;    Comprehensive analysis;    GMWR25SP;    Heavy rainfall;    RGB Himawari;    SANTANU;    Water vapor distribution;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/303/1/012056/pdf
DOI  :  10.1088/1755-1315/303/1/012056

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Early detection of the localized heavy rainfall is necessary to avoid heavy losses and even casualties. Localized heavy rainfall occurred in complex topography Bandung Basin March 17, 2017. Previous research showed a distinctive v-shaped pattern (peak period of heavy rainfall) followed with heavy rainfall and strong wind in 11.30 LT. Early dataset from two x-band radar observation data (GMWR25SP and SANTANU) and composite RGB Himawari satellite are used to investigate the first signal before the v-shaped occurred. The period of the dataset is from 10.50 LT until 11.10 LT. Comparison from both time and visualization of the dataset are conducted to analyze the event. Time comparison from three dataset showed differences for the emergence of early indication. GMWR25SP is the first that could detect the early origin of convective cell. Visual comparison in three dataset showed slightly different pattern, especially for composite RGB Himawari. Similarity pattern are only showed in the period 11.00 LT. Analysis of each dataset are necessary to see more detailed on the generation process. SANTANU showed a rapid growth process from one cell into two convective cells spatially within 20 minutes period. The vertical growth of these two convective cells are persistent and reaching up to 10 km based on GMWR25SP. These strong convective cells are probably because of the vorticity couplet that occur in 11.00 LT until 11.10 LT. The dominant air mass movement based on the water vapor distribution RGB Himawari are showed towards the west side. This probably affect the position of the generated second convective cell (position on the left side of the previous cell). Data indication in 11.10 LT is the important period because it showed the generated second convective cell. Combination from three dataset give a more comprehensive analysis on the process before localized heavy rainfall occurred.