| Xu Dan,Li Zhiyuan,Wan Zhanhong,Ren Zongfu,Zou Zhongshui,Lv Xiuyang,Luo Shizhu. 2020. The oceanic responses to Typhoon Rananim on the East China Sea. Acta Oceanologica Sinica, 39(7):69－78 |
| The oceanic responses to Typhoon Rananim on the East China Sea |
| 东海对台风云娜的海洋响应 |
| Received:March 31, 2019 |
| DOI：10.1007/s13131-020-1573-5 |
| Key words:typhoon sea surface temperature numerical model mix layer near inertial oscillation |
| 中文关键词: 台风 海面温度 数值模型 混合层 近惯性振荡 |
| 基金项目:The National Natural Science Foundation of China under contract Nos 11572283, 11602179 and 41806028; the National Key Research and Development Program of China under contract No. 2017YFC1403300; the Public Science and Technology Research Funds Projects of Ocean under contract No. 20110518-5. |
| Author Name | Affiliation | E-mail | | Xu Dan | College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China | | | Li Zhiyuan | Collegeof Hydraulic and Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China | | | Wan Zhanhong | Ocean College, Zhejiang University, Zhoushan 316021, China | wanzhanhong@zju.edu.cn | | Ren Zongfu | Ocean College, Zhejiang University, Zhoushan 316021, China | | | Zou Zhongshui | Ocean College, Zhejiang University, Zhoushan 316021, China | zouzhongshui@126com | | Lv Xiuyang | Ocean College, Zhejiang University, Zhoushan 316021, China | | | Luo Shizhu | Ocean College, Zhejiang University, Zhoushan 316021, China | |
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| Abstract: |
| Many typhoons pass through the East China Sea (ECS) and the oceanic responses to typhoons on the ECS shelf are very energetic. However, these responses are not well studied because of the complicated background oceanic environment. The sea surface temperature (SST) response to a severe Typhoon Rananim in August 2004 on the ECS shelf was observed by the merged cloud-penetrating microwave and infrared SST data. The observed SST response shows an extensive SST cooling with a maximum cooling of 3℃ on the ECS shelf and the SST cooling lags the typhoon by about one day. A numerical model is designed to simulate the oceanic responses to Rananim. The numerical model reasonably simulates the observed SST response and thereby provides a more comprehensive investigation on the oceanic temperature and current responses. The simulation shows that Rananim deepens the ocean mix layer by more than 10 m on the ECS shelf and causes a cooling in the whole mixed layer. Both upwelling and entrainment are responsible for the cooling. Rananim significantly deforms the background Taiwan Warm Current on the ECS shelf and generates strong Ekman current at the surface. After the typhoon disappears, the surface current rotates clockwise and vertically, the current is featured by near inertial oscillation with upward propagating phase. |
| 中文摘要: |
| 海洋对台风的响应在大陆架上非常强烈。然而由于复杂的海洋环境背景，这些响应没有得到很好的研究。利用云透微波和红外海温数据观测2014年8月东海陆架海温对台风拉尼娜的响应，观察到的海温响应表明，当台风云娜通过环空系统时会引起广泛的海温冷却，最高冷却温度为3℃，海温冷却比台风滞后一天。通过数学模型来模拟海洋对雷诺现象的响应，可以很好地模拟观测到的海温响应，从而为海温和海流响应提供更全面的研究。模拟结果表明，台风云娜使东海大陆架上的海洋混合层深度超过10米，导致整个混合层冷却，其中上升流和夹带都是冷却的原因。台风云娜也显著改变了东海大陆架上的台湾暖流，并在表面产生强烈的埃克曼流。台风消失后，表层海流呈顺时针和垂直旋转，具有向上传播的近惯性振荡特征。 |
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