ABSTRACT

Cyclone Hudhud originated in the Andaman Sea on 6 October 2014. Later, it intensified into a cyclonic storm on 8 October and eventually made landfall at Visakhapatnam on 12 October as a very severe cyclonic storm. It was intensified off of Visakhapatnam by high stratified waters with a thick barrier layer that held significant heat content. In this study, we analysed the data along the cyclone track using a combination of satellite, in-situ Argo and Bio-Argo data to assess the upper oceanic changes along the Hudhud track. Notable changes were detected in the upper ocean due to its extreme intensification and prior passage through cold-core eddies. A high translation speed and persistent stratification dominated the effects caused by the cold-core eddies on the intensification of the cyclone and the same was attributed to the upwelled subsurface chlorophyll maxima. The biophysical changes in the top 150 m layer derived from Argo floats were in good agreement with the satellite and model data. Further, it was observed that the increase in lightning flash rates also influenced surface productivity during the cyclone. Subsequent to the passage of the cyclone, the ocean took two weeks to achieve its original state.

摘要

飓风哈德于 2014 年 10 月 6 日起源于安达曼海。随后，它于 10 月 8 日增强为气旋风暴，最终于 10 月 12 日在维沙卡帕特南登陆，成为非常严重的气旋风暴。它在维沙卡帕特南附近被带有厚厚屏障层的高分层水域强化了，其中含有大量的热量。在这项研究中，我们结合使用卫星、原位 Argo 和 Bio-Argo 数据分析了气旋轨道沿线的数据，以评估 Hudhud 轨道沿线的上层海洋变化。由于上层海洋的极度强化和先前通过冷核涡流，在上层海洋中发现了显着变化。高平移速度和持续分层主导了冷核涡旋对气旋增强的影响，这也归因于上升流的地下叶绿素最大值。来自 Argo 浮标的顶部 150 m 层的生物物理变化与卫星和模型数据非常吻合。此外，还观察到闪电频率的增加也影响了旋风期间的地表生产力。气旋过去后，海洋用了两周时间才恢复到原来的状态。