Tropical storm-forced near-inertial energy dissipation in the southeast continental shelf region of Hainan Island  

作　　者：ZHANG ShuWen XIE LingLing ZHAO Hui HOU YiJun 

机构地区：[1]Guangdong Key Lab. of Climate, Resource and Environment in Continental Shelf Sea and Deep Sea,College of Ocean and Meteorology, Guangdong Ocean University [2]Institute of Oceanology, Chinese Academy of Sciences

出　　处：《Science China Earth Sciences》2014年第8期1879-1884,共6页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 41176011, U1133001, U0933001);Guangdong University Pearl River Scholar Bonus Schemes (Grant No. GDUPS-2010)

摘　　要：Near-inertial motion is an important dynamic process in the upper ocean and plays a significant role in mass, heat, and energy transport across the thermocline. In this study, the dissipation of wind-induced near-inertial energy in the thermocline is investigated by using observation data collected in July and August 2005 during the tropical storm Washi by a moored system at(19°35′N, 112°E) in the continental shelf region off Hainan Island. In the observation period, the near-inertial part dominated the observed ocean kinetic energy and about 80% of the near-inertial energy dissipated in the upper layer. Extremely strong turbulent mixing induced by near-inertial wave was observed in the thermocline, where the turbulent energy dissipation rate increased by two orders of magnitude above the background level. It is found that the energy loss of near-inertial waves in the thermocline is mainly in the large-scales. This is different from the previous hypothesis based on "Kolmogorov cascade" turbulence theory that the kinetic energy is dissipated mainly by small-scale motions.Near-inertial motion is an important dynamic process in the upper ocean and plays a significant role in mass, heat, and energy transport across the thermocline. In this study, the dissipation of wind-induced near-inertial energy in the thermocline is investigated by using observation data collected in July and August 2005 during the tropical storm Washi by a moored system at（19°35′N, 112°E） in the continental shelf region off Hainan Island. In the observation period, the near-inertial part dominated the observed ocean kinetic energy and about 80% of the near-inertial energy dissipated in the upper layer. Extremely strong turbulent mixing induced by near-inertial wave was observed in the thermocline, where the turbulent energy dissipation rate increased by two orders of magnitude above the background level. It is found that the energy loss of near-inertial waves in the thermocline is mainly in the large-scales. This is different from the previous hypothesis based on “Kolmogorov cascade” turbulence theory that the kinetic energy is dissipated mainly by small-scale motions.

关 键 词：tropical storm Washi continental shelf region of Hainan Island near-inertial energy dissipation in thermocline 

分 类 号：P732[天文地球—海洋科学]