The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka

被引：0

作者：

Huang, Wan-Ru ^{[1
]}

Koralegedara, Suranjith Bandara ^{[1
]}

Chiang, Tzu-Yang ^{[1
]}

Lee, Cheng-An ^{[1
]}

Tung, Po-Han ^{[1
]}

Chien, Yu-Tang ^{[1
]}

Deng, Liping ^{[2
]}

机构：

[1] Natl Taiwan Normal Univ, Dept Earth Sci, Taipei, Taiwan

[2] Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang, Peoples R China

来源：

NPJ CLIMATE AND ATMOSPHERIC SCIENCE | 2024年 / 7卷 / 01期

关键词：

MARITIME CONTINENT; RAINFALL; MJO; CYCLE; PRECIPITATION; SPACE; SEASONALITY; SIMULATION; PROJECTION; EVENT;

D O I：

10.1038/s41612-024-00586-5

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

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).

引用

页数：13

共 50 条

[1] The impact of the Madden-Julian oscillation on spring and autumn afternoon diurnal convection in Sri Lanka
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Suranjith Bandara Koralegedara
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Cheng‑An Lee
Po-Han Tung
Yu-Tang Chien
Liping Deng
[J]. npj Climate and Atmospheric Science, 7
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