Asymmetric Impacts of ENSO on Boreal Winter Southern Subtropical Cell in the Indian Ocean
文献类型：期刊论文
| 作者 | Liu, Yu2,3,4 ; Xu, Kang1,3; Wang, Weiqiang1,3; Xie, Qiang4; He, Zhuoqi3
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| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
 |
| 出版日期 | 2024-05-01 |
| 卷号 | 129期号:5页码:16 |
| ISSN号 | 2169-9275 |
| DOI | 10.1029/2023JC020692 |
| 英文摘要 | The interannual relationships between the southern subtropical cell (SSTC) in the Indian Ocean (IO) and the El Ni & ntilde;o-Southern Oscillation (ENSO) are examined. The results demonstrate that the impacts of ENSO on the boreal winter IO SSTC display a notable negative skewness, with the amplification of the SSTC during La Ni & ntilde;a being far stronger than its reduction during El Ni & ntilde;o. This difference is mainly attributed to an asymmetry in anomalous meridional geostrophic transport, characterized by more robust southward (weaker northward) geostrophic transport anomalies during La Ni & ntilde;a (El Ni & ntilde;o) events. Further analyses reveal that the differing longitudinal positions of the ENSO-related sea surface temperature anomaly (SSTA) are the primary drivers of the asymmetry in anomalous meridional geostrophic transport via the oceanic and atmospheric teleconnections. Compared to the warm SSTA in El Ni & ntilde;o events, the La Ni & ntilde;a-related cool SSTA in the central-eastern equatorial Pacific displays a greater westward extension, which induces stronger surface easterlies over the western equatorial Pacific, and then initiates a more substantial sea surface height anomaly (SSHA) in the southeast Indian Ocean (SEIO) through oceanic waveguides. This leads to a heightened zonal SSHA gradient over the southern IO, resulting in a larger anomalous meridional geostrophic transport. On the other hand, the westward extension of negative SSTA during La Ni & ntilde;a winters triggers anomalous cyclonic northerlies along the western coast of Australia by shifting the Walker circulation westward. These coastal northerlies amplify the positive SSHA signals in the SEIO and enhance the anomalous meridional geostrophic transport, ultimately contributing to a more robust IO SSTC response. The southern subtropical cell (SSTC), driven by wind over the Indian Ocean (IO), is characterized by southward surface flow, subduction in the subtropics, and upwelling in the tropics. This study revealed that the boreal winter SSTC weakens during El Ni & ntilde;o and enhances during La Ni & ntilde;a, with the latter exhibiting a notably stronger response, contrary to the expected El Ni & ntilde;o/La Ni & ntilde;a amplitudes. These asymmetric ENSO impacts predominantly result from disparities in anomalous meridional geostrophic transport. In-depth analysis further uncovered that the distinct longitudinal positions of ENSO-related sea surface temperature anomalies (SSTA) primarily drive the asymmetry in anomalous meridional geostrophic transport. During La Ni & ntilde;a events, the cool SSTA in the central-eastern equatorial Pacific extends significantly westward compared to the El Ni & ntilde;o-related warm SSTA, which is evident during both the preceding season and the contemporaneous winter. During the preceding season, this westwardly extended SSTA leads to a more substantial anomalous meridional geostrophic transport in the subsequent winters through the propagation of oceanic waveguides. In La Ni & ntilde;a winters, the westward extension of negative SSTA further amplifies the anomalous meridional geostrophic transport by shifting the Walker circulation westward. These intensified meridional geostrophic transport anomalies ultimately result in a more pronounced SSTC response during La Ni & ntilde;a events. The boreal winter southern subtropical cell (SSTC) in the Indian Ocean displays a negative skewness in response to El Ni & ntilde;o-Southern Oscillation (ENSO) Such asymmetric SSTC responses are primarily attributed to an asymmetry in anomalous meridional geostrophic transport Differing longitudes of ENSO-related sea surface temperature anomaly cause the asymmetric meridional geostrophic transport via oceanic and atmospheric teleconnections |
| WOS关键词 | MERIDIONAL OVERTURNING CIRCULATION ; AIR-SEA INTERACTION ; INTERANNUAL VARIABILITY ; INDONESIAN THROUGHFLOW ; LEVEL ; TRANSPORT ; TEMPERATURE ; ANOMALIES ; CURRENTS ; ENERGY |
| 资助项目 | National Natural Science Foundation of China ; National Key Research and Development Program of China[2022YFE0203500] ; National Key Research and Development Program of China[2019YFA0606701] ; Guangdong Basic and Applied Basic Research Foundation[2023B1515020009] ; Guangdong Basic and Applied Basic Research Foundation[2022B1212050003] ; Youth Innovation Promotion Association of the Chinese Academy of Sciences[2020340] ; Science and Technology Planning Project of Guangzhou[2024A04J6275] ; Rising Star Foundation of the South China Sea Institute of Oceanology[NHXX2018WL0201] ; Special Fund of South China Sea Institute of Oceanology of the Chinese Academy of Sciences[SCSIO2023QY01] ; Special Fund of South China Sea Institute of Oceanology of the Chinese Academy of Sciences[SCSIO2023HC07] ; Special Fund of South China Sea Institute of Oceanology of the Chinese Academy of Sciences[SCSIO202201] ; Special Fund of South China Sea Institute of Oceanology of the Chinese Academy of Sciences[SHIYAN 6"] ; NSFC Shiptime Sharing Project[NORC2022-10+NORC2022-303: 42149910] ; NSFC Shiptime Sharing Project[NORC2023-10+NORC2023-303: 42249910] ; Chinese Academy of Sciences ; [42076020] |
| WOS研究方向 | Oceanography |
| 语种 | 英语 |
| WOS记录号 | WOS:001231731900001 |
| 出版者 | AMER GEOPHYSICAL UNION |
| 资助机构 | National Natural Science Foundation of China ; National Key Research and Development Program of China ; Guangdong Basic and Applied Basic Research Foundation ; Youth Innovation Promotion Association of the Chinese Academy of Sciences ; Science and Technology Planning Project of Guangzhou ; Rising Star Foundation of the South China Sea Institute of Oceanology ; Special Fund of South China Sea Institute of Oceanology of the Chinese Academy of Sciences ; NSFC Shiptime Sharing Project ; Chinese Academy of Sciences |
| 源URL | [http://ir.idsse.ac.cn/handle/183446/11039]  |
| 专题 | 深海科学研究部_海洋环流观测与数值模拟研究室 |
| 通讯作者 | Xu, Kang; Wang, Weiqiang |
| 作者单位 | 1.Chinese Acad Sci, Guangdong Key Lab Ocean Remote Sensing, South China Sea Inst Oceanol, Guangzhou, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China 4.Chinese Acad Sci, Inst Deep sea Sci & Engn, Sanya, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Yu,Xu, Kang,Wang, Weiqiang,et al. Asymmetric Impacts of ENSO on Boreal Winter Southern Subtropical Cell in the Indian Ocean[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2024,129(5):16. |
| APA | Liu, Yu,Xu, Kang,Wang, Weiqiang,Xie, Qiang,&He, Zhuoqi.(2024).Asymmetric Impacts of ENSO on Boreal Winter Southern Subtropical Cell in the Indian Ocean.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,129(5),16. |
| MLA | Liu, Yu,et al."Asymmetric Impacts of ENSO on Boreal Winter Southern Subtropical Cell in the Indian Ocean".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 129.5(2024):16. |
入库方式： OAI收割
来源：深海科学与工程研究所
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