The oceanic responses to Typhoon Rananim on the East China Sea

Dan Xu; Zhiyuan Li; Zhanhong Wan; Zongfu Ren; Zhongshui Zou; Xiuyang Lv; Shizhu Luo

doi:10.1007/s13131-020-1573-5

Volume 39 Issue 7

Jul. 2020

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Article Navigation > Acta Oceanologica Sinica > 2020 > 39(7): 69-78

Dan Xu, Zhiyuan Li, Zhanhong Wan, Zongfu Ren, Zhongshui Zou, Xiuyang Lv, Shizhu Luo. The oceanic responses to Typhoon Rananim on the East China Sea[J]. Acta Oceanologica Sinica, 2020, 39(7): 69-78. doi: 10.1007/s13131-020-1573-5

Citation:

Dan Xu, Zhiyuan Li, Zhanhong Wan, Zongfu Ren, Zhongshui Zou, Xiuyang Lv, Shizhu Luo. The oceanic responses to Typhoon Rananim on the East China Sea[J]. Acta Oceanologica Sinica, 2020, 39(7): 69-78. doi: 10.1007/s13131-020-1573-5

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The oceanic responses to Typhoon Rananim on the East China Sea

doi: 10.1007/s13131-020-1573-5

1.
College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
2.
Collegeof Hydraulic and Environmental Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, China
3.
Ocean College, Zhejiang University, Zhoushan 316021, China

Funds: The National Key Research and Development Program of China under contract Nos 2016YFC0402303 and 2017YFC1403300; the National Natural Science Foundation of China under contract Nos 11572283, 11602179 and 41806028; the Public Science and Technology Research Funds Projects of Ocean under contract No. 20110518-5.

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Corresponding author: Zhongshui Zou & Zhanhong Wan; E-mail: zouzhongshui@126com, wanzhanhong@zju.edu.cn; Zhongshui Zou & Zhanhong Wan; E-mail: zouzhongshui@126com, wanzhanhong@zju.edu.cn
Received Date: 2019-03-31
Accepted Date: 2019-09-27

Available Online: 2020-12-28

Publish Date: 2020-07-25

Abstract

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°C 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.
- typhoon,
- sea surface temperature,
- numerical model,
- mix layer,
- near inertial oscillation

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References(25)

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