Distinctive Features of Tropical Waves Before and After the South China Sea Summer Monsoon Onset
Abstract This study reveals the remarkable differences in the synoptic‐scale tropical waves before and after the South China Sea (SCS) summer monsoon (SCSSM) onset. Before the monsoon onset, the dominant synoptic‐scale systems around the SCS are the eastward‐propagating equatorial Kelvin waves. Afte...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-04-01
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| Series: | Geophysical Research Letters |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2025GL114763 |
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| _version_ | 1849397296104472576 |
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| author | Peng Hu Wen Chen Shangfeng Chen Jingliang Huangfu Yulian Tang Zhibo Li Ming Sun Lin Wang Yuyun Liu |
| author_facet | Peng Hu Wen Chen Shangfeng Chen Jingliang Huangfu Yulian Tang Zhibo Li Ming Sun Lin Wang Yuyun Liu |
| author_sort | Peng Hu |
| collection | DOAJ |
| description | Abstract This study reveals the remarkable differences in the synoptic‐scale tropical waves before and after the South China Sea (SCS) summer monsoon (SCSSM) onset. Before the monsoon onset, the dominant synoptic‐scale systems around the SCS are the eastward‐propagating equatorial Kelvin waves. After the SCSSM onset, while the Kelvin waves remain largely unaltered, the transitions from mixed Rossby‐gravity waves to tropical depression (TD)‐type waves become more pronounced. Such distinctive features of the tropical waves before and after SCSSM onset are attributable to the adjustments in atmospheric mean flow. An anomalous low‐level cyclone develops around the SCS after the monsoon onset. The convergence and shear of this anomalous low‐level cyclone contribute to the barotropic energy conversion from the mean flow to the synoptic‐scale systems, which is conducive to the development of TD‐type waves and genesis of tropical cyclones. |
| format | Article |
| id | doaj-art-d806c5f5e568430f8db6807dfd904125 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-d806c5f5e568430f8db6807dfd9041252025-08-20T03:39:04ZengWileyGeophysical Research Letters0094-82761944-80072025-04-01528n/an/a10.1029/2025GL114763Distinctive Features of Tropical Waves Before and After the South China Sea Summer Monsoon OnsetPeng Hu0Wen Chen1Shangfeng Chen2Jingliang Huangfu3Yulian Tang4Zhibo Li5Ming Sun6Lin Wang7Yuyun Liu8Yunnan International Joint Laboratory of Monsoon and Extreme Climate Disasters Yunnan University Kunming ChinaYunnan International Joint Laboratory of Monsoon and Extreme Climate Disasters Yunnan University Kunming ChinaState Key Laboratory of Earth System Numerical Modeling and Application Institute of Atmospheric Physics Chinese Academy of Sciences Beijing ChinaState Key Laboratory of Earth System Numerical Modeling and Application Institute of Atmospheric Physics Chinese Academy of Sciences Beijing ChinaState Key Laboratory of Earth System Numerical Modeling and Application Institute of Atmospheric Physics Chinese Academy of Sciences Beijing ChinaRegional Climate Group Department of Earth Sciences University of Gothenburg Gothenburg SwedenAnhui Climate Center Anhui Meteorological Administration Hefei ChinaCenter for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing ChinaCenter for Monsoon System Research Institute of Atmospheric Physics Chinese Academy of Sciences Beijing ChinaAbstract This study reveals the remarkable differences in the synoptic‐scale tropical waves before and after the South China Sea (SCS) summer monsoon (SCSSM) onset. Before the monsoon onset, the dominant synoptic‐scale systems around the SCS are the eastward‐propagating equatorial Kelvin waves. After the SCSSM onset, while the Kelvin waves remain largely unaltered, the transitions from mixed Rossby‐gravity waves to tropical depression (TD)‐type waves become more pronounced. Such distinctive features of the tropical waves before and after SCSSM onset are attributable to the adjustments in atmospheric mean flow. An anomalous low‐level cyclone develops around the SCS after the monsoon onset. The convergence and shear of this anomalous low‐level cyclone contribute to the barotropic energy conversion from the mean flow to the synoptic‐scale systems, which is conducive to the development of TD‐type waves and genesis of tropical cyclones.https://doi.org/10.1029/2025GL114763South China Sea summer monsoon onsettropical wavesKelvin waveMRG waveTD‐type wave |
| spellingShingle | Peng Hu Wen Chen Shangfeng Chen Jingliang Huangfu Yulian Tang Zhibo Li Ming Sun Lin Wang Yuyun Liu Distinctive Features of Tropical Waves Before and After the South China Sea Summer Monsoon Onset Geophysical Research Letters South China Sea summer monsoon onset tropical waves Kelvin wave MRG wave TD‐type wave |
| title | Distinctive Features of Tropical Waves Before and After the South China Sea Summer Monsoon Onset |
| title_full | Distinctive Features of Tropical Waves Before and After the South China Sea Summer Monsoon Onset |
| title_fullStr | Distinctive Features of Tropical Waves Before and After the South China Sea Summer Monsoon Onset |
| title_full_unstemmed | Distinctive Features of Tropical Waves Before and After the South China Sea Summer Monsoon Onset |
| title_short | Distinctive Features of Tropical Waves Before and After the South China Sea Summer Monsoon Onset |
| title_sort | distinctive features of tropical waves before and after the south china sea summer monsoon onset |
| topic | South China Sea summer monsoon onset tropical waves Kelvin wave MRG wave TD‐type wave |
| url | https://doi.org/10.1029/2025GL114763 |
| work_keys_str_mv | AT penghu distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset AT wenchen distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset AT shangfengchen distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset AT jinglianghuangfu distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset AT yuliantang distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset AT zhiboli distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset AT mingsun distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset AT linwang distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset AT yuyunliu distinctivefeaturesoftropicalwavesbeforeandafterthesouthchinaseasummermonsoononset |