The oceanic responses to Typhoon Rananim on the East China Sea

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 Ranan...

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Bibliographic Details
Published in:Acta oceanologica Sinica 2020-07, Vol.39 (7), p.69-78
Main Authors: Xu, Dan, Li, Zhiyuan, Wan, Zhanhong, Ren, Zongfu, Zou, Zhongshui, Lv, Xiuyang, Luo, Shizhu
Format: Article
Language:English
Subjects:
Climatology
Computer simulation
Cooling
Earth and Environmental Science
Earth Sciences
Ecology
Engineering Fluid Dynamics
Entrainment
Environmental Chemistry
Hurricanes
Inertial oscillations
Marine & Freshwater Sciences
Marine environment
Mathematical models
Mixed layer
Numerical models
Ocean circulation
Ocean temperature
Oceanography
Sea surface
Sea surface temperature
Shelving
Simulation
Surface temperature
Typhoons
Upwelling
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Summary: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.
ISSN:0253-505X
1869-1099
DOI:10.1007/s13131-020-1573-5