| Ma Tian,Cheng Xuhua,Qi Yiquan,Chen Jiajia. 2020. Interannual variability in the barrier layer and forcing mechanism in the eastern equatorial Indian Ocean and Bay of Bengal. Acta Oceanologica Sinica, 39(7):19－31 |
| Interannual variability in the barrier layer and forcing mechanism in the eastern equatorial Indian Ocean and Bay of Bengal |
| 赤道东印度洋和孟加拉湾障碍层厚度的年际变化及其影响机制 |
| Received:October 31, 2019 |
| DOI：10.1007/s13131-020-1575-3 |
| Key words:barrier layer thickness interannual variability eastern equatorial Indian Ocean Bay of Bengal |
| 中文关键词: 障碍层厚度 年际变化 赤道东印度洋 孟加拉湾 |
| 基金项目:The National Key R&D Program of China under contract No. 2018YFA0605702; the National Natural Science Foundation of China under contract Nos 41522601, 41876002 and 41876224; the Fundamental Research Funds for the Central Universities under contract Nos 2017B04714 and 2017B4114. |
| Author Name | Affiliation | E-mail | | Ma Tian | Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing 210098, China | | | Cheng Xuhua | Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing 210098, China
College of Oceanography, Hohai University, Nanjing 210098, China
Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519000, China | xuhuacheng@hhu.edu.cn | | Qi Yiquan | Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing 210098, China | | | Chen Jiajia | Key Laboratory of Marine Hazards Forecasting, Ministry of Natural Resources, Hohai University, Nanjing 210098, China | |
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| Abstract: |
| Interannual variability (IAV) in the barrier layer thickness (BLT) and forcing mechanisms in the eastern equatorial Indian Ocean (EEIO) and Bay of Bengal (BoB) are examined using monthly Argo data sets during 2002–2017. The BLT during November–January (NDJ) in the EEIO shows strong IAV, which is associated with the Indian Ocean dipole mode (IOD), with the IOD leading the BLT by two months. During the negative IOD phase, the westerly wind anomalies driving the downwelling Kelvin waves increase the isothermal layer depth (ILD). Moreover, the variability in the mixed layer depth (MLD) is complex. Affected by the Wyrtki jet, the MLD presents negative anomalies west of 85°E and strong positive anomalies between 85°E and 93°E. Therefore, the BLT shows positive anomalies except between 86°E and 92°E in the EEIO. Additionally, the IAV in the BLT during December–February (DJF) in the BoB is also investigated. In the eastern and northeastern BoB, the IAV in the BLT is remotely forced by equatorial zonal wind stress anomalies associated with the El Niño-Southern Oscillation (ENSO). In the western BoB, the regional surface wind forcing-related ENSO modulates the BLT variations. |
| 中文摘要: |
| 利用2002-2017年Argo网格化温度和盐度数据，揭示了赤道东印度洋和孟加拉湾障碍层厚度的年际变化及其影响机制。在11-1月期间，赤道东印度洋的障碍层厚度表现出很强的年际变化，这与印度洋偶极子(IOD)有关，IOD相位领先于障碍层厚度两个月。在负IOD期间，西风异常驱动下沉Kelvin波增加了等温层深度。然而，混合层的变化较为复杂。受Wyrtki急流影响，混合层深度在85°E以西表现为负异常，在85°E至93°E之间表现为较强的正异常。因此，除了在86°E到92°E之间，赤道东印度洋的障碍层厚度均为正异常。此外，本文还讨论了12-2月期间孟加拉湾障碍层厚度的年际变化。在孟加拉湾的东部和东北部，障碍层厚度的年际变化受到赤道东印度洋纬向风应力的遥强迫作用，赤道纬向风应力异常受到厄尔尼诺-南方涛动(ENSO)的影响。另外，与ENSO相联系的局地海表面风场是造成孟加拉湾西部障碍层厚度年际变化的主要原因。 |
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