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The impact of double vortex phenomena in eastern Indian Ocean on rainfall in western part of Indonesia
Putra I.K.Y.D.a, Trilaksono N.J.a
a Weather and Climate Prediction Laboratory, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© 2018 Author(s).On 29 December 2013, several areas of Sumatra Island, particularly Padang City, were flooded by heavy rains lasting from 28 December 2013. The torrential rains coincided with the emergence of a synoptic-scale phenomenon in the eastern Indian Ocean known as Double Vortex. However, it is still unclear whether those phenomena interrelated one to another, thus a deep examination is needed to study the relationship between the torrential rains and the Double Vortex. In this study, the identification of the Double Vortex phenomena was carried out using daily wind reanalysis data from the National Centers for Atmospheric Prediction and National Center for Atmospheric Research (NCEP-NCAR) during 2005/2006 to 2015/2016. Furthermore, the effect of Double Vortex on the intensity of rainfall is analyzed quantitatively using surface observation data in 16 stations spread across the western Indonesia, especially Sumatra, Java and Borneo Island. Double Vortex identification results showed 56 Double Vortex occurred during the study period. Furthermore, the analysis of surface observation data indicates a significant increase in rainfall during Double Vortex, especially in Padang, Bengkulu and Palembang stations with an increase of 12.8, 8.5 and 12.2 mm/day, respectively. Significant increase of rainfall is expected due to the location of the three stations situated between two vortexes. On the other hand, there is a significant decrease in rainfall in Java after the Double Vortex event due to the weakening of cross equatorial flow as a result of the vortex in the eastern Indian Ocean north of the equator where the Double Vortex phenomena occurred. It is important to monitor the Double Vortex event as part of hazard mitigation due to the capability of the event to bring damage as has been pointed out.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]We would like to thank the National Aeronautics and Space Administration (NASA) for providing and accessing daily wind reanalysis data used in this study. Furthermore, we would like to thank to Badan Meteorologi, Klimatologi, dan Geofisika (BMKG) for providing surface rainfall observation data that also used in this study. This research was partly supported by Institut Teknologi Bandung through Research, Community Service, and Innovation Program (P3MI) ITB 2017.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1063/1.5047330[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]