| 孟加拉湾障碍层年际变化及其与印度洋偶极子事件的联系 |
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| 引用本文： | 郭文仪,邱云,林新宇.孟加拉湾障碍层年际变化及其与印度洋偶极子事件的联系[J].海洋学报,2020,42(9):38-49. |
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| 作者姓名： | 郭文仪 邱云 林新宇 |
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| 作者单位： | 自然资源部第三海洋研究所，福建 厦门 361005 |
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| 基金项目： | 自然资源部第三海洋研究所基本科研业务费专项资金项目（海三科2018001，海三科2017012，海三科2018030）；全球变化与海气相互作用专项（GASI-IPOVAI-02，GASI-IPOVAI-03）；国家自然科学基金（41276034，41906013）；国家重点研发计划（2016YFC1401003，2016YFC1402607）；国家留学基金委访问学者基金（201604180033）。 |
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| 摘 要： | 利用1980?2015年SODA温盐资料，结合Argo数据分析了印度洋偶极子(IOD)事件年份孟加拉湾障碍层的变化特征及其形成机制。结果表明，IOD事件年份孟加拉湾障碍层变化显著。纯的正IOD(纯pIOD)年份及伴随型pIOD年份盛期(9?11月)，除孟加拉湾内西南海域障碍层厚度略变厚约5 m外，赤道海域、安达曼海至孟加拉湾北部障碍层厚度均变薄5～15 m，此障碍层距平盛期形态在纯pIOD年份随pIOD消亡迅速消退，但在伴随型pIOD年份维持至翌年3?5月才开始弱化。纯的负IOD (纯nIOD)年份障碍层厚度变化特征与pIOD年份大体相反。进一步分析表明，IOD事件年份赤道风场距平的远地强迫造成等温层深度的变化是湾内障碍层变化的主因。在伴随型IOD年份，受ENSO事件的影响，赤道风场距平在IOD消亡后仍得以维持3个月以上，使得湾内障碍层距平形态持续更久。除赤道远地强迫外，湾内局地风场的Ekman抽吸作用以及混合盐度变化对障碍层厚度年际变化也有一定影响。
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| 关 键 词： | 孟加拉湾 障碍层 印度洋偶极子 ENSO |
| 收稿时间： | 2019/10/17 0:00:00 |
| 修稿时间： | 2019/11/22 0:00:00 |
The interannual variability of barrier layer in the Bay of Bengal and its relationship with IOD events |
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| Guo Wenyi,Qiu Yun,Lin Xinyu.The interannual variability of barrier layer in the Bay of Bengal and its relationship with IOD events[J].Acta Oceanologica Sinica (in Chinese),2020,42(9):38-49. |
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| Authors: | Guo Wenyi Qiu Yun Lin Xinyu |
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| Institution: | Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China |
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| Abstract: | Based on the temperature and salinity grid data of SODA from1980 to 2015 and combined with Argo data, the formation mechanism and seasonal variability of the barrier layer thickness in the Bay of Bengal in Indian Ocean Dipole (IOD) events are revealed. The results show that the barrier layer changed significantly in the IOD event year. In the peak of pure IOD events (pIOD) and the pIOD+El Niño events (September-November), except for the 5 m thickening of the barrier layer in the southwest of the Bay of Bengal, the barrier layer become thinner range from 5 m to 15 m in the equatorial region and the region from Andaman Sea to the northern Bay of Bengal. This form disappears as the pIOD weakens. However, the form is maintained until March to May of the following year in the pIOD+El Niño events. The variation of barrier layer in the nIOD year is roughly opposite to that of the pIOD year. Further analysis shows that the change of isothermal layer caused by the remote forcing of the equatorial wind anomaly in the IOD event is the main cause of the variability of barrier layer. In the IOD+ENSO events, the equatorial wind anomaly is maintained for more than three months after the IOD disappear, making the anomaly of barrier layer last longer in the Bay of Bengal. In addition to the equatorial forcing, the Ekman pumping in the Bay of Bengal and the variability of the salt of mixed layer also have an effect on the interannual variation of the barrier layer thickness. |
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| Keywords: | Bay of Bengal barrier layer Indian Ocean Dipole ENSO |
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