THE CHARACTERISTIC OF MADDEN JULIAN OSCILLATION (MJO) IN MARITIME CONTINENT DURING 2015 EL NIÑO EVENT

• Main Author: Rikayasa, Hana
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/69887
• Institution: Institut Teknologi Bandung

Madden Julian Oscillation (MJO) is an intraseasonal phenomenon characterized by convective heating moving east along the equator. There are indications that ENSO affects MJO propagation when passing the Maritime Continent. This study aims to analyze the characteristics of the intraseasonal phenomenon of MJO in the Maritime Continent when coincided with the 2015 strong El Niño. The data used include OLR, zonal wind pressure of 850 hPa, and SST from October 2014 to June 2016 with the domain of interest 12°S to 8° N and 90°E to 170°W and focused on Maritime Continent. Univariate EOF analysis was performed on 30-90 days bandpass filtered OLR, 850 hPa zonal winds, and SST anomalies. It is found that three EOF leading modes play a role in the propagation of MJO to the east and their interactions with El Niño. These three modes are reconstructed to their respective parameters and are shown in hovmöller diagrams. Of the fourteen MJO events occurred in phases 5 and 6, eight of them are classified as strong MJOs dan seven of them were able to propagate strongly to the Central Pacific Ocean. The three leading EOF modes of OLR, 850 hPa zonal winds, and SST anomalies have cumulative contributions of 69.88%, 79.79%, and 51.13% respectively. Mode 3 EOF in Maritime Continent on all parameters has a unique variance and opposite values from other regions. The MJO propagation which is marked by negative anomalies of OLR and westerly 850 hPa zonal winds moves strongly and extended its propagations when strong El Niño occurred, while the SST anomalies could not propagate further east like two other parameters but indicates increasing intensity.