LA NIÑA MODOKI IMPACTS ON RAINFALL IN INDONESIA

• Main Author: Faradila, Farah
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/63746
• Institution: Institut Teknologi Bandung

Indonesia has a dynamic and complex climate variability. Of the various climate variability that may accur in Indonesia, one of them is La Niña Modoki. The dynamics of the atmosphere during La Nia Modoki are different from Conventional La Nia. As a consequence, La Niña Modoki also has a different impact on rainfall in Indonesia. However, research on La Niña Modoki in Indonesia has not been comprehensive. So this study identifies all La Niña Modoki events and analyzes the conditions and their effects on rainfall in Indonesia. In this study, El Nino Modoki Index (EMI) data was used to identify La Niña Modoki events. Atmospheric conditions during La Niña Modoki were analyzed using anomaly composite method on Sea Surface Temperature(SST), zonal(u) and meridional(v) winds and vertical velocity data. Furthermore, the analysis of the influence of La Niña Modoki was carried out using the Maximum Covariance Analysis (MCA) method on SST and rainfall anomaly data to determine the percentage of variance between La Niña Modoki SST anomalies and rainfall anomalies in Indonesia. After that, the anomaly conditions of rainfall in Indonesia are also analyzed seasonally using the composite method. The results show that climatologically La Niña Modoki is the fourth mode of MCA which contributes 4.05% of the total variance in rainfall anomalies in Indonesia. Seasonally, Indonesia is generally dominated by positive rainfall anomalies in each season. Meanwhile, spatially Indonesia is dominated by positive rainfall anomalies in the SON season. In addition, the northern part of Papua experiences negative rainfall anomalies in every season.