Differential Influences of Teleconnections from the Indian and Pacific Oceans on Rainfall Variability in Southeast Asia
This study investigates the individual and combined impacts of El Niño and the positive Indian Ocean Dipole (IOD) on the Southeast Asia (SEA) rainfall variability. Using composite and partial correlation techniques, it is shown that both inter-annual events have individually distinct impacts on the...
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| Format: | Article |
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MDPI AG
2020-08-01
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| Series: | Atmosphere |
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| Online Access: | https://www.mdpi.com/2073-4433/11/9/886 |
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| author | Abdul Azim Amirudin Ester Salimun Fredolin Tangang Liew Juneng Muhamad Zuhairi |
| author_facet | Abdul Azim Amirudin Ester Salimun Fredolin Tangang Liew Juneng Muhamad Zuhairi |
| author_sort | Abdul Azim Amirudin |
| collection | DOAJ |
| description | This study investigates the individual and combined impacts of El Niño and the positive Indian Ocean Dipole (IOD) on the Southeast Asia (SEA) rainfall variability. Using composite and partial correlation techniques, it is shown that both inter-annual events have individually distinct impacts on the SEA rainfall anomaly distribution. The results showed that the impacts of the co-occurrence of El Niño and IOD events are significant compared to the individual effects of pure El Niño or pure IOD. During June-July-August and September-October-November, the individual impacts of the pure El Niño and IOD events are similar but less significant. Both events caused negative impacts over the southern part of SEA during June-July-August (JJA) and propagated northeastward/eastward during September-October-November (SON). Thus, there are significant negative impacts over the southern part of SEA during the co-occurrence of both events. The differential impacts on the anomalous rainfall patterns are due to the changes in the sea surface temperature (SST) surrounding the region. Additionally, the differences are also related to the anomalous regional atmospheric circulations that interact with the regional SST. The anomalous Walker circulation that connects the Indian Ocean and tropical Pacific Ocean also plays a significant role in determining the regional anomalous rainfall patterns. |
| first_indexed | 2024-03-10T17:01:39Z |
| format | Article |
| id | doaj.art-275b4489b8714495804664f2ab22614f |
| institution | Directory Open Access Journal |
| issn | 2073-4433 |
| language | English |
| last_indexed | 2024-03-10T17:01:39Z |
| publishDate | 2020-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Atmosphere |
| spelling | doaj.art-275b4489b8714495804664f2ab22614f2023-11-20T10:55:24ZengMDPI AGAtmosphere2073-44332020-08-0111988610.3390/atmos11090886Differential Influences of Teleconnections from the Indian and Pacific Oceans on Rainfall Variability in Southeast AsiaAbdul Azim Amirudin0Ester Salimun1Fredolin Tangang2Liew Juneng3Muhamad Zuhairi4Department of Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Selangor, Bangi 43600 UKM, MalaysiaDepartment of Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Selangor, Bangi 43600 UKM, MalaysiaDepartment of Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Selangor, Bangi 43600 UKM, MalaysiaDepartment of Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Selangor, Bangi 43600 UKM, MalaysiaDepartment of Earth Sciences and Environment, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Selangor, Bangi 43600 UKM, MalaysiaThis study investigates the individual and combined impacts of El Niño and the positive Indian Ocean Dipole (IOD) on the Southeast Asia (SEA) rainfall variability. Using composite and partial correlation techniques, it is shown that both inter-annual events have individually distinct impacts on the SEA rainfall anomaly distribution. The results showed that the impacts of the co-occurrence of El Niño and IOD events are significant compared to the individual effects of pure El Niño or pure IOD. During June-July-August and September-October-November, the individual impacts of the pure El Niño and IOD events are similar but less significant. Both events caused negative impacts over the southern part of SEA during June-July-August (JJA) and propagated northeastward/eastward during September-October-November (SON). Thus, there are significant negative impacts over the southern part of SEA during the co-occurrence of both events. The differential impacts on the anomalous rainfall patterns are due to the changes in the sea surface temperature (SST) surrounding the region. Additionally, the differences are also related to the anomalous regional atmospheric circulations that interact with the regional SST. The anomalous Walker circulation that connects the Indian Ocean and tropical Pacific Ocean also plays a significant role in determining the regional anomalous rainfall patterns.https://www.mdpi.com/2073-4433/11/9/886interannual variabilitypositive IODEl Niño |
| spellingShingle | Abdul Azim Amirudin Ester Salimun Fredolin Tangang Liew Juneng Muhamad Zuhairi Differential Influences of Teleconnections from the Indian and Pacific Oceans on Rainfall Variability in Southeast Asia Atmosphere interannual variability positive IOD El Niño |
| title | Differential Influences of Teleconnections from the Indian and Pacific Oceans on Rainfall Variability in Southeast Asia |
| title_full | Differential Influences of Teleconnections from the Indian and Pacific Oceans on Rainfall Variability in Southeast Asia |
| title_fullStr | Differential Influences of Teleconnections from the Indian and Pacific Oceans on Rainfall Variability in Southeast Asia |
| title_full_unstemmed | Differential Influences of Teleconnections from the Indian and Pacific Oceans on Rainfall Variability in Southeast Asia |
| title_short | Differential Influences of Teleconnections from the Indian and Pacific Oceans on Rainfall Variability in Southeast Asia |
| title_sort | differential influences of teleconnections from the indian and pacific oceans on rainfall variability in southeast asia |
| topic | interannual variability positive IOD El Niño |
| url | https://www.mdpi.com/2073-4433/11/9/886 |
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