APPLICATION OF WRF FOR CLOUD GROWTH DETECTION CASE STUDY SINGKAWANG SHORELINE IN WEST KALIMANTAN

• Main Author: Surya Dharma, Candrasa
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/53532
• Institution: Institut Teknologi Bandung

High intensity rain with short duration happened on November 8th 2017 at 20.20 WIB on Singkawang Shore West Kalimantan was investigated. This research was conducted to explain the process of convective cloud growth and the significance of microphysics scheme to predict such events, by implementing four different microphysics simulations from weather model such as Weather Research forecast (WRF) and cloud model namely Kinematic Model Driver (KiD) with Thompson microphysics scheme. Those events were confirmed by TRMM data and Himawari-8 imagery. The WRF simulation was guided by three initial condition, each from November 6th, 7th, and 8th of 2017, using WRF on three domains, with the first domain spreading over West Kalimantan and South China Sea, the second domain on West Kalimantan and the third domain covering Singkawang coastline area. The simulation of each hydrometeor to form clouds and rain was managed with KiD, warm 5 scenario and Thompson scheme was implemented, using the vertical wind data derived from WRF simulations. TRMM recorded a 4,4 mm Rain at 22.00 WIB, but there was decaying convective cloud detected on the incident date, from Himawari-8 with increasing cloud phase to mature cloud, two hours after the incident time. WRF simulations verified that WDM6 and Thompson Aerosol microphysics scheme was superior to predict the cumulative rain events, with vertical wind ranges from 0.01- 0,02 m/s, furthermore, KiD simulations with vertical wind value ranges from 0,01-0,2 m/s, predicts two rain events at 15th and 50th minutes simulations time. The results sugests that surface precipitation was affected by microphysics process of the conversion of cloud water path and rain water path to convert into rain number inside clouds, and there was significant increase of rain number inside clouds when vertical wind increasing to 0,1 m/s and create the second rain events.