The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka
Abstract This study examines the impact of strong Madden-Julian Oscillation (MJO) phases (P1–P8) on diurnal rainfall patterns focusing on Afternoon Diurnal Convection (ADC) events in Sri Lanka during 2001–2020 spring and autumn. Daily mean rainfall increases (decreases) during the P2-to-P3 (P6-to-P7...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2024-02-01
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| Series: | npj Climate and Atmospheric Science |
| Online Access: | https://doi.org/10.1038/s41612-024-00586-5 |
| _version_ | 1797275293242621952 |
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| author | Wan‑Ru Huang Suranjith Bandara Koralegedara Tzu-Yang Chiang Cheng‑An Lee Po-Han Tung Yu-Tang Chien Liping Deng |
| author_facet | Wan‑Ru Huang Suranjith Bandara Koralegedara Tzu-Yang Chiang Cheng‑An Lee Po-Han Tung Yu-Tang Chien Liping Deng |
| author_sort | Wan‑Ru Huang |
| collection | DOAJ |
| description | Abstract This study examines the impact of strong Madden-Julian Oscillation (MJO) phases (P1–P8) on diurnal rainfall patterns focusing on Afternoon Diurnal Convection (ADC) events in Sri Lanka during 2001–2020 spring and autumn. Daily mean rainfall increases (decreases) during the P2-to-P3 (P6-to-P7) MJO phases in both seasons, while the diurnal rainfall amplitude peaks during the P2-to-P3 (P8-to-P1) MJO phases in spring (autumn). ADC events also occur more frequently and intensely during MJO P2-to-P3 (P8-to-P1) in spring (autumn). The MJO’s modulation of diurnal rainfall amplitude and ADC events is more apparent in autumn than in spring. Active MJO phases enhance the westward propagation of diurnal rainfall associated with ADC events, sustained by moisture flux convergence and enhanced upward motion. The prevailing mid-to-upper level easterly wind, combined with deep convection over Sri Lanka, contributes to a more pronounced westward propagation during the P2-to-P3 (P8-to-P1) phases for ADC events in spring (autumn). |
| first_indexed | 2024-03-07T15:12:12Z |
| format | Article |
| id | doaj.art-9784732bd51c488a8911c44e825407a7 |
| institution | Directory Open Access Journal |
| issn | 2397-3722 |
| language | English |
| last_indexed | 2024-03-07T15:12:12Z |
| publishDate | 2024-02-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Climate and Atmospheric Science |
| spelling | doaj.art-9784732bd51c488a8911c44e825407a72024-03-05T18:08:15ZengNature Portfolionpj Climate and Atmospheric Science2397-37222024-02-017111310.1038/s41612-024-00586-5The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri LankaWan‑Ru Huang0Suranjith Bandara Koralegedara1Tzu-Yang Chiang2Cheng‑An Lee3Po-Han Tung4Yu-Tang Chien5Liping Deng6Department of Earth Sciences, National Taiwan Normal UniversityDepartment of Earth Sciences, National Taiwan Normal UniversityDepartment of Earth Sciences, National Taiwan Normal UniversityDepartment of Earth Sciences, National Taiwan Normal UniversityDepartment of Earth Sciences, National Taiwan Normal UniversityDepartment of Earth Sciences, National Taiwan Normal UniversityCollege of Ocean and Meteorology, Guangdong Ocean UniversityAbstract This study examines the impact of strong Madden-Julian Oscillation (MJO) phases (P1–P8) on diurnal rainfall patterns focusing on Afternoon Diurnal Convection (ADC) events in Sri Lanka during 2001–2020 spring and autumn. Daily mean rainfall increases (decreases) during the P2-to-P3 (P6-to-P7) MJO phases in both seasons, while the diurnal rainfall amplitude peaks during the P2-to-P3 (P8-to-P1) MJO phases in spring (autumn). ADC events also occur more frequently and intensely during MJO P2-to-P3 (P8-to-P1) in spring (autumn). The MJO’s modulation of diurnal rainfall amplitude and ADC events is more apparent in autumn than in spring. Active MJO phases enhance the westward propagation of diurnal rainfall associated with ADC events, sustained by moisture flux convergence and enhanced upward motion. The prevailing mid-to-upper level easterly wind, combined with deep convection over Sri Lanka, contributes to a more pronounced westward propagation during the P2-to-P3 (P8-to-P1) phases for ADC events in spring (autumn).https://doi.org/10.1038/s41612-024-00586-5 |
| spellingShingle | Wan‑Ru Huang Suranjith Bandara Koralegedara Tzu-Yang Chiang Cheng‑An Lee Po-Han Tung Yu-Tang Chien Liping Deng The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka npj Climate and Atmospheric Science |
| title | The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka |
| title_full | The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka |
| title_fullStr | The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka |
| title_full_unstemmed | The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka |
| title_short | The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka |
| title_sort | impact of the madden julian oscillation on spring and autumn afternoon diurnal convection in sri lanka |
| url | https://doi.org/10.1038/s41612-024-00586-5 |
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