ANALYSIS OF EL NIÑO MODOKI EFFECT ON WIND PATTERNS IN MARITIME CONTINENT (MC)

• Main Author: Alditya Priatna, Mishka
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/42740
• Institution: Institut Teknologi Bandung

El Niño Modoki is an interannual variability phenomenon indicated by SST (Sea Surface Temperature) warm-up anomaly on central tropical Pacific Ocean region. El Niño Modoki phenomenon is distinct from Conventional El Niño, which has an anomaly pattern on the eastern Pacific Ocean. El Niño Modoki has a relatively strong influence on climatic conditions in the Maritime Continent (MC) due to the vertical wind subsidence in the region. So, in general, the rainfall pattern in the MC region has decreased. However, its influence on the eastern and western areas is not the same. Therefore, this study will analyzes the physical mechanism of rainfall distribution by examining wind patterns in the MC area. This research uses monthly El Niño Modoki Index (EMI) data, zonal (u), meridional (v), and vertical (w) of wind reanalysis data, rainfall information accessed from the Global Precipitation Climatology Project (GPCP), and divergence data. It uses linear regression analysis method between u, v, and w wind toward wind and apply composite analysis to rainfall. Based on the results obtained, rainfall composite analysis shows negative anomaly result for the eastern part of the MC region and positive anomaly for the western part during El Niño Modoki phenomenon. Eastern MC region becomes the center of divergence anomaly formation. Contrarily, western MC region becomes the center of convergence anomaly. Then, linear regression analysis gives u and v wind pattern result on DJF season has the difference compared to another season. Wind patterns of u, v, and w in the MAM and SON seasons have similarities.