On the Influence of Enso And IOD on Rainfall Variability Over The Musi Basin, SouthSumatra

Mardiansyah, Wijaya and Setiabudidaya, Dedi and Khakim, Mokhamad Yusup Nur and Yustian, Indra and Dahlan, Zulkifli and Iskandar, Iskhaq (2018) On the Influence of Enso And IOD on Rainfall Variability Over The Musi Basin, SouthSumatra. Science and Technology Indonesia, 3 (4). ISSN 2580-4391

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Abstract

The southern Sumatera region experiences one rainy season and one dry season in a year associated with seasonal change inmonsoonal winds. The peak of rainy season is occurring in November-December-January during the northwest monsoon season,while the dry season comes in June-July-August during the southeast monsoon season. This study is designed to evaluate possibleinfluence of the coupled ocean-atmospheric modes in the tropical Indo-Pacific region, namely the El Niño-Southern Oscillation(ENSO) and the Indian Ocean Dipole (IOD) on the rainfall variability over the catchment area of the Music Basin, South Sumatera.The ENSO and IOD occurrences were reflected by the variability of sea surface temperature (SST) in the tropical Pacific and IndianOcean, respectively. During El Niño and/or positive IOD episode, negative SST anomalies cover the eastern tropical Indian Oceanand western tropical Pacific including the Indonesian seas, leading to suppress convective activities that result in reduce precipitationover the maritime continent. The situation is reversed during La Niña and/or negative IOD event. The results revealed that the hightopography area (e.g. Bukit Barisan) was shown to be instrumental to the pattern of rainfall variability. During the 2010 negative IODco-occurring with La Niña event, the rainfall was significantly increase over the region. This excess rainfall was associated with warmSST anomaly over the eastern tropical Indian Ocean and the Indonesian seas. On the other hand, extreme drought event tendsto occur during the 2015 positive IOD simultaneously with the occurrence of the El Niño events Investigation on the SST patternsrevealed that cold SST anomalies covered the Indonesian seas during the peak phase of the 2015 positive IOD and El Niño event.KeywordsENSO, Indian Ocean Dipole, Musi Basin, rainfall variability, sea surface temperature

Item Type:	Article
Subjects:	Q Science > QC Physics > QC1-999 Physics
Divisions:	08-Faculty of Mathematics and Natural Science > 45201-Physics (S1)
Depositing User:	Wijaya Mardiansyah
Date Deposited:	16 Jun 2023 01:25
Last Modified:	16 Jun 2023 01:25
URI:	http://repository.unsri.ac.id/id/eprint/111021

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