| Qiu Fuwen,Qiu Yun,Pan Aijun,Cha Jing,Zhang Shanwu. 2019. Sea level anomalies in the northwestern Pacific during 2011 associated with La Niña and negative Indian Ocean Dipole. Acta Oceanologica Sinica, 38(11):62－69 |
| Sea level anomalies in the northwestern Pacific during 2011 associated with La Niña and negative Indian Ocean Dipole |
| 2011年西北太平洋海平面异常及其与拉尼娜和负印度洋偶极子的联系 |
| Received:July 17, 2018 |
| DOI：10.1007/s13131-019-1499-y |
| Key words:sea level anomalies|La Niña|negative IOD|northwestern Pacific |
| 中文关键词: 海平面异常,拉尼娜,负印度洋偶极子,西北太平洋 |
| 基金项目:The SOA Program on Global Change and Air-Sea Interactions under contract Nos GASI-IPOVAI-02, GASI-IPOVAI-03 and GASI-03-01-01-04; the National Key Research and Development Program of China under contract Nos 2016YFC1402607, 2016YFC1401003 and 2016YFC1401403; the Chinese Academy of Sciences Strategic Leading Science and Technology Projects under contract No. XDA1102030104; the National Natural Science Foundation of China under contract No. 41505041. |
| Author Name | Affiliation | E-mail | | Qiu Fuwen | Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China | qiufuwen@tio.org.cn | | Qiu Yun | Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China | | | Pan Aijun | Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China | | | Cha Jing | Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China | | | Zhang Shanwu | Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China | |
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| Abstract: |
| The sea level anomalies (SLAs) pattern in the northwestern Pacific delineated significant differences between La Niña events occurring with and without negative Indian Ocean Dipole (IOD) events. During the pure La Niña events, positive the sea surface level anomalies (SLAs) appear in the northwestern Pacific, but SLAs are weakened and negative SLAs appear in the northwestern Pacific under the contribution of the negative IOD events in 2010/2011. The negative IOD events can trigger significant westerly wind anomalies in the western tropical Pacific, which lead to the breakdown of the pronounced positive SLAs in the northwestern Pacific. Meanwhile, negative SLAs excited by the positive wind stress curl near the dateline propagated westward in the form of Rossby waves until it approached the western Pacific boundary in mid-2011, which maintained and enhanced the negative phase of SLAs in the northwestern Pacific and eventually, it could significantly influence the bifurcation and transport of the North Equatorial Current (NEC). |
| 中文摘要: |
| 西北太平洋海平面异常模态在纯拉尼娜事件与拉尼娜和负印度洋偶极子（IOD）事件同时发生时表现出完全不同的形态。在纯拉尼娜事件期间，西北太平洋海平面呈现显著的正异常；而2010/2011拉尼娜事件期间西北太平洋海平面明显降低，呈显著的负异常，其与印度洋负IOD事件密切相关。研究结果表明，负IOD事件能在热带西太平洋驱动显著的西风异常，由此减弱了拉尼娜峰值期间西北太平洋海平面正异常。同时，在负IOD峰值期的9月，在日经线附近存在显著的风应力旋度正异常，激发负的海平面异常以Rossby波的形式向西传播，并在第二年6月抵达菲律宾以东海域，维持并加强该海域海平面负异常，进而对北赤道流分叉点位置及输运产生重要的影响。 |
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