Electronic Theses and Dissertation

Penelitian ini dilakukan untuk mengetahui pengaruh fenomena Indian Ocean Dipole (IOD) terhadap curah hujan di tiga kabupaten Aceh Selatan. Analisis pengaruh fenomena IOD terhadap curah hujan di Aceh Selatan, dilakukan menggunakan data Dipole Mode Index (DMI) dan curah hujan selama lima tahun (2016 sampai 2020) pada daerah Labuhan Haji Barat, Tapak Tuan, dan Bakongan. Metode penelitian ini menggunakan analisis korelasi untuk mencari hubungan antara IOD dan curah hujan pada lokasi tersebut serta analisis komponen utama dilanjutkan dengan analisis gerombol. Peristiwa IOD pada fase negatif terjadi pada tahun 2016 dan IOD positif terjadi pada tahun 2017, 2018, 2019, 2020. Nilai DMI positif yang paling kuat terjadi pada bulan Oktober 2019 yaitu 1.123˚C, sedangkan nilai DMI negatif yang paling kuat terjadi pada bulan Juli 2016 yaitu 0.661˚C. Secara umum kecamatan Labuhan Haji Barat, Tapak Tuan, dan Bakongan memiliki karakteristik curah hujan selalu tinggi. Curah hujan di Labuhan Haji Barat tertinggi tercatat pada bulan Januari 2017 sebesar 1014 mm/bulan, sedangkan curah hujan di Tapak Tuan tertinggi tercatat pada bulan November 2017 sebesar 1073 mm/bulan dan Curah hujan di Bakongan tertinggi tercatat pada bulan Juli 2020 sebesar 605 mm/bulan. Korelasi antara DMI dan curah hujan di tiga lokasi berbeda-beda. Fenomena IOD mempengaruhi curah hujan yang ada di Labuhan Haji Barat, Tapak Tuan, dan Bakongan walaupun sangat kecil. Di Labuhan Haji Barat korelasi yang tertinggi pada lag 1 yaitu +0.188, di Tapak Tuan korelasi yang tertinggi pada lag 2 yaitu +0.156, sedangkan di Bakongan korelasi yang tertinggi terjadi pada lag 2 yaitu -0.191. Korelasi ketiga lokasi termasuk kedalam korelasi yang lemah. Fenomena IOD bukan merupakan faktor utama dalam pembentukan curah hujan di Labuhan Haji Barat, Tapak Tuan, dan Bakongan.
Kata kunci : Indian Ocean Dipole, curah hujan, analisis korelasi, Labuhan Haji Barat, Tapak Tuan, dan Bakongan

This research was conducted to find out the influence of the Indian Ocean Dipole (IOD) phenomenon on rainfall in three districts of South Aceh. Analysis of the influence of IOD phenomenon on rainfall in South Aceh, conducted using Dipole Mode Index (DMI) data and rainfall for five years (2016 to 2020) in the area of Labuhan Haji Barat, Tapak Tuan, and Bakongan. This research method uses correlation analysis to look for the relationship between IOD and rainfall at that location as well as analysis of key components followed by cluster analysis. IOD events in the negative phase occurred in 2016 and positive IOD occurred in 2017, 2018, 2019, 2020. The strongest positive DMI value occurred in October 2019 at 1.123°C, while the strongest negative DMI value occurred in July 2016 at 0.661°C. In general, the districts of Labuhan Haji Barat, Tapak Tuan, and Bakongan have the characteristics of always high rainfall. Rainfall in Labuhan Haji Barat was highest recorded in January 2017 at 1014 mm/month, while rainfall at Tapak Tuan was highest recorded in November 2017 at 1073 mm/month and the highest rainfall in Bakongan was recorded in July 2020 at 605 mm/month. The correlation between DMI and rainfall in three locations is different. The IOD phenomenon affects rainfall in Labuhan Haji Barat, Tapak Tuan, and Bakongan even though it is very small. In Labuhan Haji Barat the highest correlation in lag 1 is +0.188, at Tapak Tuan the highest correlation in lag 2 is +0.156, while in Bakongan the highest correlation occurs in lag 2 which is -0.191. The correlation of the three locations is included in the weak correlation. The IOD phenomenon is not a major factor in the formation of rainfall in Labuhan Haji Barat, Tapak Tuan, and Bakongan. Keywords : Indian Ocean Dipole, rainfall, analysis correlation, West Labuhan Haji, Tapak Tuan, and Bakongan