Analysis of upper ocean response to Typhoon Doksuri in the northwest South China Sea

Zhang Qian; Liao Guanghong; Lin Feilong; Jin Weifang; Liang Chujin

doi:10.3969/j.issn.0253-4193.2019.07.003

Volume 41 Issue 7

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Zhang Qian，Liao Guanghong，Lin Feilong, et al. Analysis of upper ocean response to Typhoon Doksuri in the northwest South China Sea[J]. Haiyang Xuebao，2019, 41(7)：22–35，doi:10.3969/j.issn.0253−4193.2019.07.003

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Analysis of upper ocean response to Typhoon Doksuri in the northwest South China Sea

doi: 10.3969/j.issn.0253-4193.2019.07.003

1.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, Minisitry of Natural Resources, Hangzhou 310012, China
2.
College of Oceanography, Hohai University, Nanjing 210098, China

Received Date: 2018-07-04
Rev Recd Date: 2018-10-09

Available Online: 2021-04-21

Publish Date: 2019-07-25

Abstract

Abstract

Based on the in-situ data from mooring deployed in the northwest South China Sea, we investigate the dynamical and thermal dynamical response of upper ocean to Typhoon Doksuri. In the aspect of dynamic response, as the Typhoon passing, the currents in upper layer enhanced strikingly, the zonal currents in the mixed layer reaches 1.20 m/s. After the passage of Typhoon Doksuri, the currents in the upper layer are dominated by near-inertial oscillation, which rotate clockwise with a period between 36–40 hours. The kinetic energy of near-inertial wave shows two high energetic cores in vertical, which locates at the mixed layer and the thermocline layer, respectively. The estimated e-folding time-scale of near-inertial energy decay is about 3.7 d, and we believe that the downward propagation of energy is the major reason for the decay. The power spectra analysis of currents reveals that power density at inertial frequency, during the period of Typhoon Doksuri, increases about 29.4 times larger than that before the Typhoon arriving. Nevertheless, power density both at diurnal (K₁) and semidiurnal (M₂) frequency decreases during Typhoon period. Additionally, a blue shift at inertial frequency is identified. We find that the averaged near-internal frequency in upper 400 m is 1.167 f₀ for zonal near-inertial currents and 1.170 f₀ for meridional near-inertial currents (where f₀ is the local inertial frequency). This blue shift is connected with the downward propagation of near-inertial waves and input of positive relative vorticity. In the aspect of thermodynamic response, the temperature rises in the upper layer between 40–250 m depth, due to the stirring induced by strong wind, and the maximum increased temperature amplitude is about 1℃. In addition, the decrease of salinity above 70 m may be related to the precipitation caused by the Typhoon. While the upwelling induced by Ekman pumping may have significant contribution to the increase of salinity at the depth of 70–100 m.
- near-inertial oscillations,
- energy spectrum,
- dynamic response,
- thermodynamic response,
- South China Sea

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