An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s
In this study, the interdecadal change in the size of the Indo-Pacific warm pool (IPWP) and its connection with the intensity of the South China Sea summer monsoon (SCSSM) in May are investigated. The results show that the size of the IPWP experienced a marked interdecadal extension in the late 1980...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Environmental Research Letters |
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| Online Access: | https://doi.org/10.1088/1748-9326/ab8588 |
| _version_ | 1797747541016576000 |
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| author | Xiaoxue Yin Jingliang Huangfu Lian-Tong Zhou |
| author_facet | Xiaoxue Yin Jingliang Huangfu Lian-Tong Zhou |
| author_sort | Xiaoxue Yin |
| collection | DOAJ |
| description | In this study, the interdecadal change in the size of the Indo-Pacific warm pool (IPWP) and its connection with the intensity of the South China Sea summer monsoon (SCSSM) in May are investigated. The results show that the size of the IPWP experienced a marked interdecadal extension in the late 1980s, and its impacts on the SCSSM have also strengthened. Further analyses indicate that interdecadal changes in the connection between the IPWP and SCSSM variations are related to the changes in the atmospheric circulation anomalies over the tropical western Pacific due to the size of the IPWP. During 1951–1986, the IPWP was smaller than the climatologic size, which led to suppressed convection over the tropical western Pacific and easterly anomalies north of the equator. The Philippines and South China Sea (SCS) region was controlled by anomalous anticyclonic circulation, which was not conducive to the formation and development of the SCSSM. In contrast, during 1987–2018, the IPWP expanded significantly eastward. As a response to the IPWP size extension, convective activities were enhanced over the tropical western Pacific. Anomalous cyclonic circulation was located over the Philippines and SCS regions, which favored the enhancement of the SCSSM through wide westerly flow in the Bay of Bengal and tropical western Pacific. Moreover, it is shown that the interdecadally enhanced intraseasonal oscillations (ISOs) over the tropical western Pacific in the late 1980s also favored reinforcement of the SCSSM intensity. |
| first_indexed | 2024-03-12T15:52:02Z |
| format | Article |
| id | doaj.art-9bd65db7c8eb45d28b17c5c4e451a853 |
| institution | Directory Open Access Journal |
| issn | 1748-9326 |
| language | English |
| last_indexed | 2024-03-12T15:52:02Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
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| series | Environmental Research Letters |
| spelling | doaj.art-9bd65db7c8eb45d28b17c5c4e451a8532023-08-09T15:06:36ZengIOP PublishingEnvironmental Research Letters1748-93262020-01-0115606401510.1088/1748-9326/ab8588An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980sXiaoxue Yin0Jingliang Huangfu1https://orcid.org/0000-0003-4805-9629Lian-Tong Zhou2Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences , P.O. Box 2718, Beijing 100190, People’s Republic of ChinaCenter for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences , P.O. Box 2718, Beijing 100190, People’s Republic of ChinaCenter for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences , P.O. Box 2718, Beijing 100190, People’s Republic of ChinaIn this study, the interdecadal change in the size of the Indo-Pacific warm pool (IPWP) and its connection with the intensity of the South China Sea summer monsoon (SCSSM) in May are investigated. The results show that the size of the IPWP experienced a marked interdecadal extension in the late 1980s, and its impacts on the SCSSM have also strengthened. Further analyses indicate that interdecadal changes in the connection between the IPWP and SCSSM variations are related to the changes in the atmospheric circulation anomalies over the tropical western Pacific due to the size of the IPWP. During 1951–1986, the IPWP was smaller than the climatologic size, which led to suppressed convection over the tropical western Pacific and easterly anomalies north of the equator. The Philippines and South China Sea (SCS) region was controlled by anomalous anticyclonic circulation, which was not conducive to the formation and development of the SCSSM. In contrast, during 1987–2018, the IPWP expanded significantly eastward. As a response to the IPWP size extension, convective activities were enhanced over the tropical western Pacific. Anomalous cyclonic circulation was located over the Philippines and SCS regions, which favored the enhancement of the SCSSM through wide westerly flow in the Bay of Bengal and tropical western Pacific. Moreover, it is shown that the interdecadally enhanced intraseasonal oscillations (ISOs) over the tropical western Pacific in the late 1980s also favored reinforcement of the SCSSM intensity.https://doi.org/10.1088/1748-9326/ab8588Indo-Pacific warm poolSouth China Sea summer monsooninterdecadal shiftintraseasonal oscillation |
| spellingShingle | Xiaoxue Yin Jingliang Huangfu Lian-Tong Zhou An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s Environmental Research Letters Indo-Pacific warm pool South China Sea summer monsoon interdecadal shift intraseasonal oscillation |
| title | An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s |
| title_full | An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s |
| title_fullStr | An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s |
| title_full_unstemmed | An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s |
| title_short | An interdecadal extension of the Indo-Pacific warm pool and its strengthened influence on the South China Sea summer monsoon since the late 1980s |
| title_sort | interdecadal extension of the indo pacific warm pool and its strengthened influence on the south china sea summer monsoon since the late 1980s |
| topic | Indo-Pacific warm pool South China Sea summer monsoon interdecadal shift intraseasonal oscillation |
| url | https://doi.org/10.1088/1748-9326/ab8588 |
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