Track variability of South China Sea-formed tropical cyclones modulated by seasonal and intraseasonal circulations
Tracks of tropical cyclones (TCs) forming in the South China Sea (SCS) are examined in terms of their seasonal variability and associated modulations by seasonal and intraseasonal circulations. Three major TC tracks appear in the SCS: northeastward (NE) toward the Philippines and Taiwan, northward (...
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| Format: | Article |
| Language: | English |
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Springer
2020-01-01
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| Series: | Terrestrial, Atmospheric and Oceanic Sciences |
| Online Access: |
http://tao.cgu.org.tw/media/k2/attachments/v312p239.pdf
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| _version_ | 1811301158375915520 |
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| author | Jau-Ming Chen Po-Hsiung Lin Ching-Hsuan Wu Chung-Hsiung Sui |
| author_facet | Jau-Ming Chen Po-Hsiung Lin Ching-Hsuan Wu Chung-Hsiung Sui |
| author_sort | Jau-Ming Chen |
| collection | DOAJ |
| description | Tracks of tropical cyclones (TCs) forming in the South China Sea (SCS) are examined in terms of their seasonal variability and associated modulations by seasonal and intraseasonal circulations. Three major TC tracks appear in the SCS: northeastward (NE) toward the Philippines and Taiwan, northward (N) toward southern China, and westward-northwestward (W-NW) toward the Indochina Peninsula and southwestern China. Seasonally, the dominant tracks are NE in May, from NE into W-NW in June, W-NW and N in July to September (JAS), and W-NW in October to November (ON). Formation of TCs with W-NW tracks is associated with a southeastward-extending monsoon trough (MT) and a northwestward-expanding western Pacific subtropical high (WPSH) in May to June (MJ), a southward-intensified MT and a westward-strengthened WPSH in JAS, and a northward and westward enhanced equatorial trough in ON. Formation of TCs with NE tracks in MJ is related to an eastward-intensified MT and an eastward-retreated WPSH. For TCs with N tracks, their formation is associated with an eastward and northward intensification of the MT and a northwestward extension of the WPSH. In terms of modulations of intraseasonal oscillations (ISOs), the 10-24-day and 30-60-day ISOs exert different effects on TC movement. For all track types, TCs tend to follow the propagation of the 10-24-day cyclonic anomaly and move along different tracks. The above movement comes under the influence of favorable environments in terms of moisture convergence provided by 30-60-day cyclonic anomalies distributing along TC tracks. The 10-24-day and 30-60-day ISOs exhibit comparable intensity to jointly modulate TC activity in the SCS. |
| first_indexed | 2024-04-13T07:03:55Z |
| format | Article |
| id | doaj.art-ffd76b9f3c6c4c128e284a4db019c8be |
| institution | Directory Open Access Journal |
| issn | 1017-0839 2311-7680 |
| language | English |
| last_indexed | 2024-04-13T07:03:55Z |
| publishDate | 2020-01-01 |
| publisher | Springer |
| record_format | Article |
| series | Terrestrial, Atmospheric and Oceanic Sciences |
| spelling | doaj.art-ffd76b9f3c6c4c128e284a4db019c8be2022-12-22T02:57:03ZengSpringerTerrestrial, Atmospheric and Oceanic Sciences1017-08392311-76802020-01-0131223925910.3319/TAO.2019.11.07.02Track variability of South China Sea-formed tropical cyclones modulated by seasonal and intraseasonal circulationsJau-Ming ChenPo-Hsiung LinChing-Hsuan WuChung-Hsiung SuiTracks of tropical cyclones (TCs) forming in the South China Sea (SCS) are examined in terms of their seasonal variability and associated modulations by seasonal and intraseasonal circulations. Three major TC tracks appear in the SCS: northeastward (NE) toward the Philippines and Taiwan, northward (N) toward southern China, and westward-northwestward (W-NW) toward the Indochina Peninsula and southwestern China. Seasonally, the dominant tracks are NE in May, from NE into W-NW in June, W-NW and N in July to September (JAS), and W-NW in October to November (ON). Formation of TCs with W-NW tracks is associated with a southeastward-extending monsoon trough (MT) and a northwestward-expanding western Pacific subtropical high (WPSH) in May to June (MJ), a southward-intensified MT and a westward-strengthened WPSH in JAS, and a northward and westward enhanced equatorial trough in ON. Formation of TCs with NE tracks in MJ is related to an eastward-intensified MT and an eastward-retreated WPSH. For TCs with N tracks, their formation is associated with an eastward and northward intensification of the MT and a northwestward extension of the WPSH. In terms of modulations of intraseasonal oscillations (ISOs), the 10-24-day and 30-60-day ISOs exert different effects on TC movement. For all track types, TCs tend to follow the propagation of the 10-24-day cyclonic anomaly and move along different tracks. The above movement comes under the influence of favorable environments in terms of moisture convergence provided by 30-60-day cyclonic anomalies distributing along TC tracks. The 10-24-day and 30-60-day ISOs exhibit comparable intensity to jointly modulate TC activity in the SCS. http://tao.cgu.org.tw/media/k2/attachments/v312p239.pdf |
| spellingShingle | Jau-Ming Chen Po-Hsiung Lin Ching-Hsuan Wu Chung-Hsiung Sui Track variability of South China Sea-formed tropical cyclones modulated by seasonal and intraseasonal circulations Terrestrial, Atmospheric and Oceanic Sciences |
| title | Track variability of South China Sea-formed tropical cyclones modulated by seasonal and intraseasonal circulations |
| title_full | Track variability of South China Sea-formed tropical cyclones modulated by seasonal and intraseasonal circulations |
| title_fullStr | Track variability of South China Sea-formed tropical cyclones modulated by seasonal and intraseasonal circulations |
| title_full_unstemmed | Track variability of South China Sea-formed tropical cyclones modulated by seasonal and intraseasonal circulations |
| title_short | Track variability of South China Sea-formed tropical cyclones modulated by seasonal and intraseasonal circulations |
| title_sort | track variability of south china sea formed tropical cyclones modulated by seasonal and intraseasonal circulations |
| url |
http://tao.cgu.org.tw/media/k2/attachments/v312p239.pdf
|
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