Abstract
A correlation study of the Southern Oscillation Index (SOI) on rainfall at the peak of the wet and dry season in the Kintamani-Bangli region has been carried out by taking SOI values and rainfall data for the period 1986-2015. The rainfall data used were recorded at 2 rain posts, namely Kembangsari and Kintamani. The research aimed to determine the relationship of fluctuations in the value of SOI with the intensity of rainfall, so that it can be used as a regional management plan when El Nino occurs. The method used in this study is correlation. The results obtained from the correlation that is the relationship between SOI value and rainfall in February were quite strong in the Kembangsari post with correlation coefficient of 0.409. Whereas for the Kintamani post the correlation obtained was weak with a correlation coefficient of 0.308. Then in August a weak correlation occurred in the Kembangsari post with a correlation coefficient of 0.2398 and was quite strong in the Kintamani post with a correlation coefficient of 0.4662. So that the influence of El Nino in the Kintamani area in February was more dominant in the Kembangsari post and in August at the Kintamani post.
Highlights
A correlation study of the Southern Oscillation Index (SOI) on rainfall at the peak of the wet and dry season in the Kintamani-Bangli region has been carried out by taking SOI values and rainfall data for the period 1986-2015
The rainfall data used were recorded at 2 rain posts
The research aimed to determine the relationship of fluctuations in the value
Summary
Menurut sejarahnya fenomena yang teramati oleh para penduduk atau nelayan Peru dan Ekuador yang tinggal di pantai sekitar Samudera Pasifik bagian timur menjelang hari natal (Desember) merupakan El Nino, yang teramati adalah meningkatnya suhu permukaan laut yang biasanya dingin menjadi lebih hangat. El Nino mengakibatkan perairan yang tadinya subur dan kaya akan ikan (akibat adanya upwelling atau arus naik permukaan laut yang membawa banyak nutrien dari dasar laut) menjadi sebaliknya. Pemberian nama El-Nino pada fenomena ini disebabkan oleh karena kejadian ini sering kali terjadi pada Bulan Desember. El Nino (Bahasa Spanyol) sendiri dapat diartikan sebagai “anak lelaki”. Para ahli juga menemukan bahwa selain menghangatnya suhu permukaan laut, terjadi pula sebaliknya yaitu mendinginnya suhu permukaan laut. Kebalikan dari fenomena ini selanjutnya diberi nama La Nina (Bahasa Spanyol) yang berarti “anak perempuan” [10]
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