TEMPERATUR VERTICAL STRUCTURE IN MJO-MRG INTERACTIONS USING GNSSRO DATA
Madden-Julian Oscillation (MJO) is an intra-seasonal variability that has a major impact on global atmospheric patterns characterized by the propagation of convective activity from the Indian Ocean through Indonesia to the Pacific Ocean. This study investigates the role of Mixed Rossby-Gravity (MRG)...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/72545 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Madden-Julian Oscillation (MJO) is an intra-seasonal variability that has a major impact on global atmospheric patterns characterized by the propagation of convective activity from the Indian Ocean through Indonesia to the Pacific Ocean. This study investigates the role of Mixed Rossby-Gravity (MRG) waves that propagate from the Pacific Ocean to the West in their interaction with MJO propagation. The role of the MRG was analyzed by identifying the vertical structure of temperature using atmospheric profile data from the Constellation Observing System for Meteorology 2 Global Navigation Satellite System Radio Occultation (COSMIC2-GNSSRO). Wave identification was carried out by analyzing the space- time spectrum of temperature anomalies at an altitude of 14, 17, and 21 km as a representation of the upper troposphere, tropopause, and lower stratosphere. The focus of this study was on the time of study before, during, and after (pre-, during, and -post) the two MJO events; cases with MRG (K1) and without MRG (K2). When MJO is active (during), there is a response from the interaction of Rossby waves and Kelvin waves which form a Matsunno-Gill pattern on K1. The difference occurs in the dipole pattern (cold anomali in the tropopause and warm anomali in the upper troposphere), K1 shows this pattern during the pre- and during periods while K2 only shows it in the pre-period. The cold anomali is seen in the pre-K1 period because there are convective clouds in the Indian Ocean. The appearance of the cold anomali in the tropopause during the period for K1 shows that MJO is active in Indonesian territory. In this study, it was found that MRG triggers two dipole patterns in the post period when MJO occurs concurrently with MRG. This happened because there was a cold temperature propagation by MRG to the west which initiated the MJO phenomenon. |
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