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Journal : positron

Analysis of Rainfall Patterns in Sulawesi Using the Empirical Orthogonal Function (EOF) Method and Composite Analysis Ariska, Melly; Setiyowati, Devi Ariska; Siahaan, Sardianto Markos; Seprina, Iin; Firdausi, Huriyatul; Taufiq, Taufiq
POSITRON Vol 15, No 2 (2025): Vol. 15 No. 2 Edition
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam, Univetsitas Tanjungpura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26418/positron.v15i2.91149

Abstract

topography, and ocean-land interactions, which shape weather patterns and rainfall intensity variability. This study analyzes rainfall patterns in Sulawesi Island from 1981 to 2015 using the Empirical Orthogonal Function (EOF) method and composite analysis with machine learning. The results show that the EOF method successfully identifies three primary modes of rainfall variability. EOF Mode 1 captures negative anomalies, while EOF Mode 2 and EOF Mode 3 capture both positive and negative rainfall anomalies. EOF Mode 1 is the dominant component, explaining nearly 70% of the total variance. EOF Modes 2 and 3 capture additional variations on a smaller scale, and collectively, these three modes explain 88.53% of the total rainfall variability. Meanwhile, composite analysis reveals that global factors such as ENSO and the Indian Ocean Dipole (IOD) also influence rainfall variability, impacting drought periods and extreme rainfall events. During El Niño and positive IOD phases, rainfall deficits occur, potentially leading to prolonged droughts. Conversely, during La Niña and negative IOD phases, Sulawesi experiences a significant rainfall surplus, increasing the risk of hydrometeorological disasters such as floods and landslides.
Co-Authors Abidin Pasaribu Abidin Pasaribu Abidin Pasaribu, Abidin Adam Darmawan Ade Kurniawan Ade Kurniawan Agustina, Atika Ahmad Firdaus Falka Ahmad Fitra Ritonga Aisyah Veronika Al Fatih, Zaky Alawiyah, Sakinah Alfin Suhanda Amanda Rahmannisa Amanda, Karenina Andriani, Nelly Apit Fathurohman Ari Widodo Arini Rosa Sinensis Atika Agustina Az Zahra, Lutfiah Azizah Putri Berimah Azizah Putri Berimah Berimah, Azizah Putri Dea Amalia Dea Rizky Oktavia Devi Ariska Setiyowati Diah Kartika Sari Dina Maulina Dwi Purnomo Aji Dwicahyani, Rania Dwita Kartika Sari Edo Anugrah Efrinalia, Winta Ernalida Ernalida Evelina Astra Patriot Evelina Astra Patriot Faizah Istisania Fena Siska Putriyani Firdausi, Huriyatul Fitra Ritonga, Ahmad Fitriyani Fitriyani Frendi Ihwan Syamsudin Frendi Ihwan Syamsudin Frida Ramadian Gelby Pradina Paramitha Gisca Rivia Prameswari Hamdi Akhsan Hamdi Akhsan Hamdi Akhsan Hartono Hartono Hartono Hartono Hartono Hartono Hartono Hartono Hepiyani Hepiyani Herlambang, Dominikus Krisna Huriyatul Firdausi Ida Sriyanti Ida Sriyanti Iful Amri Iin Seprina Iskhaq Iskandar Ismet Ismet Ismet, Ismet Jesi Pebralia Ketang Wiyono Ketang Wiyono Ketang Wiyono Ketang Wiyono KHOIRUN NISA Kistiono Kistiono Kistiono Kistiono Kristylia Sury Laras Sapitri, Cindy Laura Insan Kencana Leni Marlina Lira Diska Wati Masduki Masduki May Sari Mega Fatimah Rosana Melati, Pegi Meli Asma Desti Melvany, Nanda Eva Michell Butarbutar Milka, Ikbal Adrian Mindia Vanessa Pratiwi, Sri Muhamad Yusup Muhammad Afrizal Muhammad afrizal Muhammad Aufa Riyaldo Muhammad Irfan Muhammad Irfan muhammad muslim Muhammad Muslim Muhammad Muslim Muhammad Muslim, Muhammad Muhammad Putra Aririyansyah Muhammad Romadoni Muhammad Yusuf Muhammad Yusup Mulyadi Eko Purnomo, Mulyadi Eko Murnia Murniati Murniati . Nadiar Pertiwi Nely Andriani Nely Andriani, Nely Nia Three Manurung Nilam Cahyati Nor Farahwahidah Nor Farahwahidah Binti Abdul Rahman Novi Yusliani Nur Julia Ningsih Nur Kayla Lekati Nurjannah Nurjannah Nuzula, Khalidatun Pratiwi Ineke Anwar Putra, Guruh Sukarno Putri Anisah Putri Maulida, Nabila Putri Nurhikmah Putri, Astrid Yulinda Putri, Jamiatul Khairunnisa Putriyani, Fena Siska Rahma Tri Kusuma Rahmannisa, Amanda Rahmi Susanti Rahmi Susanti Rahmi Susanti Rahmi, Ani Ramadhani, Neysya Ditha Rara Rara Ratu Ilma Indra Putri Resta Ulis Muslimah Rini Khoirunnisa Rita Inderawati Rizki Novianti, Rizki Romadoni, Muhammad Ruth Magdalena Suryaningsih Sakinah Alawiyah Salmah Rianti Salsabillah, Zahwa Nur Saparini Saparini Sardianto Markos Siahaan Sardianto Markos Siahaan, Sardianto Markos Sari, Dwita Kartika Sary Silvhiany Sayyendra, Amelia Putri Senandung Senja Citra Maharani Seprina, Iin Setiyowati, Devi Ariska Siti Nur Azizah Sopia Sopia Sri Mindia Vanessa Pratiwi Sri Zakiyah Sudirman Sudirman Sudirman Sudirman Sudirman, Sudirman Suhadi Suhadi Suhadi, Suhadi Suhanda, Alfin Sunarti, Arinda Rahma Sunyono - - Supari Supari Supari Supari Supari Supari, Supari Suryaningsih, Ruth Magdalena Syahrani, Revanola Gusti Syarifudin, Agus Syuhendri, Syuhendri Taufiq Taufiq Taufiq Taufiq Tine Aprianti Tita Ratna Wulan Dari Tsabita Husna Tyse Ramadhona Utami, Amanda Kurnia Vina Yanti Viyanti Viyanti Wailaina Wardah Amalia Wati, Lira Diska Yasmine Altira Yenny Anwar Zahlia, Marsela Zahra Alwi, Zahra Zahra Ayanna Firmansyah Zahrani, Ami Zulherman Zulherman Zulherman Zulherman, Zulherman