The Influence of ENSO (El Nino/Southern Oscillation) on Rainfall Distribution in Sa Kaeo Province
Keywords:
ENSO , El Nino , La Nina , rainfall , Sa Kaeo ProvinceAbstract
This research aims to investigate the influence of ENSO on the amount of rainfall in Sa Kaeo province using twenty-two observed annual rainfall datasets in Sa Keao province and its adjacent regions, archived at the Meteorological Department of Thailand, which were covered the normal years (2008, 2009, 2012, 2013, 2014 and 2017), the period of El Nino (2015 and 2016) and La Nina phenomenon (2010 and 2011), respectively. Then, R programing language (version 3.4.4) with the geographical packages were applied in this research. The result showed that the ten years averaged annual rainfall was in the range of 1,287.57 to 1,743.33 mm, with an average of 1,443.49 mm. In addition, rainfall was more widespread in the west and the south than the north of Sa Keao province. In El Niño periods, the amount of rainfall was approximately 984.90 to 1,711.67 mm, with an average of 1,328.44 mm. The eastern and northern regions are most affected, while the southern areas of Sa Kaeo province are least affected. In La Nina periods, the average amount of precipitation was approximately around 1,397.55 to 1,916.9 mm, with an average of 1,601.38 mm. Moreover, all areas of Sa Kaeo province was affected by positive annual rainfall anomalies, except the east and the north of Sa Kaeo Province. In addition, the phenomenal years of El Nino and La Niña not only affect the year of birth, but the influence remains until the next year.
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