ANALYSIS CHARACTERISTICS OF MADDEN JULIAN OSCILLATION TO SEA SURFACE TEMPERATURE IN INDONESIAN SEAS

• Main Author: Setyaningrum, Vidiani
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/43787
• Institution: Institut Teknologi Bandung

The territory of Indonesia is an archipelago influenced by many phenomena of sea-atmospheric interactions, including the phenomenon of Madden Julian Oscillation (MJO). MJO is a marine interaction phenomenon – the atmosphere that occurs along the equator by marked the strong convection that propagates from the Indian Ocean to the Pacific Ocean. MJO events are identical to heavy rains that can affect sea parameters such as Sea Surface Temperature (SST) and can occur otherwise. This study focuses on the analysis of MJO's characteristics and its influence on SST conditions in Indonesian waters. The data used is data of the Outgoing Longwave Radiation (OLR), SST, Real-multivariate MJO (RMM) or RMM index, and 850 hPa winds from the years 1988 – 2017. The methods used are energy spectrum analyses, zero down crossing methods, Hovmöller diagrams, and wavelet analyses to review the relationship between MJO, SST, and 850 hPa winds. Results of energy spectrum Analysis of RMM index year 1988 – 2017 have an intraseasonal time scale of 55-109 days with the dominant period of 97 days. OLR Energy Spectrum Analysis in 1988 – 2017 there are intraseasonal variations that are one of them caused by MJO phenomenon with a period of 30-100 days. But there are other dominant energies with a period of 182 days, 365 days, and 540 days. The analysis of OLR anomaly in the zero down crossing method received 274 negative OLR anomaly events that spread east and 33.9% (93 from 274) including MJO events. From 93 the MJO incident was divided into two criteria: the Maritime Continent Crossing (MC-C) and the Maritime Continent Non-Crossing (MC-NC). The MC-C incident occurred 80.6% (75 of 93) and MC-nC occurred 19.3% (18 of 93) from the year 1988 – 2017. There are intraseasonal variations in the period 64 – 120 days and 32 days. Intraseasonal variations in the south of the island of Java tend to be a phase, a decrease in the OLR value followed directly by a decrease in temperature or no different phases. Intraseasonal Variations in the western island of Sumatra tend to be anti-phase, increased SST value 20 days later there is a decline in the OLR value. There is suspected influence of IOD and ENSO phenomenon on the transmission of MJO that need to be studied further.