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- Title
Remote effect of a tropical cyclone in the Bay of Bengal on a heavy-rainfall event in subtropical East Asia.
- Authors
Arakane, Sho; Hsu, Huang-Hsiung; Tu, Chia-Ying; Liang, Hsin-Chien; Yan, Zheng-Yu; Lin, Shian-Jiann
- Abstract
Torrential frontal rainfall occurred over Northern Taiwan on June 2, 2017. Prior to this rainfall, tropical cyclone (TC) Mora formed in the Bay of Bengal. This study investigated the triggering effect of TC Mora on the heavy-rainfall system through numerical experiments. The numerical experiments, in which TC Mora was included or excluded in the initial conditions, revealed that TC Mora strengthened the southwesterly winds, which effectively transported tropical warm moist air toward Taiwan, and the cool dry northerly winds to the north of Taiwan. The strengthened southeasterly and northerly winds created a strong frontal system near Taiwan. TC Mora contributed to the heavy frontal rainfall by enhancing tropical–extratropical interaction and vertical coupling in East Asia. Taiwan rainfall linked to distant tropical cyclone: In early June 2017 torrential rainfall in northern Taiwan led to extensive flooding and landslides. The frontal system producing this heavy rainfall was preceded days earlier by the formation and dissipation of Tropical Cyclone (TC) Mora in the distant Bay of Bengal. An association between the two remote events has been suggested. Sho Arakane of Academia Sinica, Taiwan and colleagues conduct hindcast experiments to investigate the effect of TC Mora on the subsequent heavy rainfall in Taiwan. The numerical experiments show that rather than directly contributing to the rain event, TC Mora affected large-scale circulations patterns over East Asia leading to increased moisture transport from the South China Sea and modified upper-level field. The impacts are not associated with TC strength given that TC Mora was a weak Category 1 storm. Whether frontal development in the region is more generally affected by remote tropical disturbances is left to further study.
- Subjects
BAY of Bengal; CYCLONES; RAINFALL; CLIMATOLOGY; ARTIFICIAL satellites
- Publication
NPJ Climate & Atmospheric Science, 2019, Vol 2, Issue 1, pN.PAG
- ISSN
2397-3722
- Publication type
Article
- DOI
10.1038/s41612-019-0082-8