COMPARATIVE OF RAINDROP SIZE DISTRIBUTION CHARACTERISTIC IN THE LAND AND OCEAN OF INDONESIAN MARITIME CONTINENT USING GLOBAL PRECIPITATION MEASUREMENT DUAL-FREQUENCY PRECIPITATION RADAR

• Main Author: Nurheliza, Dede
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/62687
• Institution: Institut Teknologi Bandung

The Indonesian Maritime Continent (BMI) is the center of atmospheric circulation activity which is influenced by various processes and the results can be observed in rainfall. Rain can be characterized by raindrop size distribution (DSD) which is influenced by aerosol according to the characteristics of the region. Global Precipitation Measurement (GPM) data makes investigations of DSD in a wider area coverage. This study about DSD can confirm the use of GPM data in the BMI and see the correlation with aerosol factor. This research used data GPM, modis and reanalysis era-5. The BMI area is divided into two regions, which is divided into land and sea. Region I cover the island of Sumatra and its surroundings because crowded the ocean route. Other than that region, it is classified into region II. Period in research is composited every three months, namely December-January-February (DJF), March-April-May (MAM), June-July-August (JJA) and September-October-November (SON) from 2014-2020. Comparison and correlation of various parameters were analyzed to see the processes that influence the formation of clouds and rain. The parameters taken are Aerosol Optical Depth (AOD), Cloud Effective Radius (CER), rainfall, DSD through mass-weighted diameter (Dm) parameters, Convective Available Potential Energy (CAPE), relative humidity and vertical velocity (?). The results showed that the distribution of Dm in BMI is greater on land than in the ocean. In BMI, the increase in the value of Dm to rainfall is not linear but there is a decrease in some land and ocean areas. GPM-DPR data can represent the distribution of DM in BMI. The AOD value in the land of region I is greater than that of region II. However, the effect of aerosol is not significant on the Dm value in the western region of BMI where the orographic factor is strong, so that effect the Dm value is smaller than the middle-eastern region of BMI.