Journal of Tropical Oceanography ›› 2020, Vol. 39 ›› Issue (2): 35-43.doi: 10.11978/2019073CSTR: 32234.14.2019073

• Marine Meteorology • Previous Articles     Next Articles

Numerical simulation of oceanic near-inertial energy induced by Typhoon Conson

Juan Li1,2,3(), Junliang Liu1, Shuqun Cai1,3,4()   

  1. 1. State Key Laboratory of Tropical Oceanography (South China Sea Institute of Oceanology, Chinese Academy of Sciences), Guangzhou 510301, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
    3. Southern Marine Science and Engineering Guangdong Laboratory, Guangzhou 511458, China
    4. Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences, Guangzhou 510301, China;
  • Received:2019-08-16 Revised:2019-09-25 Online:2020-03-10 Published:2020-03-10
  • Supported by:
    Key Research Program of Frontier Sciences, Chinese Academy of Sciences(QYZDJ-SSW-DQC034);National Natural Science Foundation of China(41890851、41430964、41521005、41776005、41406023、41476011);Program of Institution of South China Sea Ecology and Environmental Engineering, Chinese Academy of Sciences(ISEE2018PY05);Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2019ZD0304)

Abstract:

A Tropical Cyclone Wind Profile Model (TCWPM) and the NCEP/CFSR wind data are used to simulate Typhoon Conson, and a slab model is developed to simulate typhoon-induced oceanic near-inertial currents. The model results match well with both reanalysis data and in situ observations. Typhoon Conson presented a salient asymmetric wind field at the ocean surface, and the bias between the two sides of the wind field along the track reached up to 10 m·s-1. Typhoon Conson generated strong oceanic near-inertial oscillations (NIOs) after the typhoon center, which lasted for more than four days, and a significant asymmetric distribution of near-inertial kinetic energy (NIKE) indicates the strong NIOs are mainly triggered on the right-hand side of Typhoon Conson under the resonance effect. We also show that the tropical storm yields a small fraction of NIKE, e.g., the mean NIKE does not exceed 35 J·m-3, but the NIKE increases exponentially with the increasing radius of maximum wind speed (Rmax or R0), and the influence area increases linearly with Rmax, e.g., when Rmax increases from R0 to 1.5 R0, the NIKE rises from 81 to 631 J·m -3, and the influence area increases from 600 to more than 900 km2.

Key words: typhoon Conson, near-inertial kinetic energy (NIKE), numerical simulation, South China Sea

CLC Number: 

  • P732.42