Jiangsu Key Laboratory of Marine Bioresources and Environment / Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu Province, China.
Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Jiangsu Ocean University, Lianyungang, Jiangsu Province, China.
PLoS One. 2021 Mar 5;16(3):e0247521. doi: 10.1371/journal.pone.0247521. eCollection 2021.
A tropical storm (TS) Roanu occurred in northern Sri Lanka in 2016, which transported northwards along the west coast of the Bay of Bengal (BoB). During the development of the TS, ocean eddies on its track had an important effect on the intensity of Roanu. The dynamic mechanism was investigated with multisource reanalysis and Argo float data in this study. The results show that ocean eddies were the main reason why Roanu first enhanced, weakened, and then enhanced again. Warm eddy W1 supports the initial development of the TS, cold eddy C1 weakens Roanu, and warm eddy W2 continues to support Roanu. On May 19, 2016, the maximum average latent heat flux over W1 was 260.85 w/m2, while that of C1 was only 200.71 w/m2. After the passage of Roanu, the tropical cyclone heat potential (TCHP) of eddies significantly decreased. The TCHP of W1, W2, C1 and C2 decreased by 20.95 kJ/cm2, 11.07 kJ/cm2, 29.82 kJ/cm2, 9.31 kJ/cm2, respectively. The mixed layer of warm eddies deepened much more than that of cold eddies, supporting Roanu development. In addition, changes in potential vorticity (PV) values caused by the disturbance of eddies may also reflect changes in the TS intensity. This study offers new insights on the influence of ocean eddies in regulating the development of tropical cyclone (TC) in the BoB.
2016 年，一场热带风暴（TS）“罗努”在斯里兰卡北部形成，并沿着孟加拉湾（BoB）西海岸向北移动。在 TS 发展过程中，其路径上的海洋涡旋对罗努的强度有重要影响。本研究利用多源再分析和 Argo 浮标数据探讨了其动力机制。结果表明，海洋涡旋是罗努首次增强、减弱、然后再次增强的主要原因。暖涡旋 W1 支持 TS 的初始发展，冷涡旋 C1 削弱了罗努，而暖涡旋 W2 则继续支持罗努。2016 年 5 月 19 日，W1 上的最大平均潜热通量为 260.85 w/m2，而 C1 上的仅为 200.71 w/m2。罗努过境后，涡旋的热带气旋热量潜力（TCHP）显著降低。W1、W2、C1 和 C2 的 TCHP 分别减少了 20.95 kJ/cm2、11.07 kJ/cm2、29.82 kJ/cm2 和 9.31 kJ/cm2。暖涡旋的混合层比冷涡旋的混合层深得多，这为罗努的发展提供了支持。此外，涡旋扰动引起的位涡（PV）值的变化也可能反映出 TS 强度的变化。本研究为海洋涡旋在调节 BoB 热带气旋（TC）发展方面的影响提供了新的见解。
