Tropical Cyclone in the North of the South China Sea as a Factor Affecting the Structure of the Vietnamese Current
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ical Cyclone in the North of the South China Sea as a Factor Affecting the Structure of the Vietnamese Current G. A. Vlasovaa, *, Nguyen Ba Xuanb, **, M. N. Demenoka, ***, Bui Hong Longb, ****, Le Dinh Maub, *****, and Nguyen Thi Thuy Dungb, ****** a
Il’ichev Pacific Oceanological Institute, Far East Branch, Russian Academy of Sciences, Vladivostok, 690041 Russia b Institute of Oceanography, Vietnam Academy of Sciences and Technologies, Nha Trang, Vietnam *e-mail: [email protected] **e-mail: [email protected] ***e-mail: [email protected] ****e-mail: [email protected] *****e-mail: [email protected] ******e-mail: [email protected] Received October 8, 2019; revised March 21, 2020; accepted April 1, 2020
Abstract—Tropical cyclones play a significant role in the formation of the hydrodynamic regime of the South China Sea, including its western part, which is bordered by the coast of Vietnam. In this region, the main hydrodynamic structure is the Vietnamese (western boundary) Current. Its structure depends on both seasonal monsoons and tropical cyclones. Therefore, the study of this dependence is an important task for Vietnamese scientists. The results of these studies are not only of scientific, but also of great practical importance, because the social and economic development of Vietnam largely depends on the activity and variability of synoptic and hydrodynamic processes in this region. This paper presents the results of joint Russian–Vietnamese studies on the dependence of the vertical structure of the Vietnamese current on tropical Pacific cyclones in the north of the South China Sea during the interseasonal winter–summer period. This study is based on numerical modeling. The calculations were performed for April–June 1999, for which the necessary initial field data are available. The simulation results indicated that the Vietnamese Current during this time period is not a uniform stream of water masses. Instead, the structure of water masses in this region is governed by a strong anticyclonic circulation and a deep cyclonic circulation, which are responsible for the complex pattern of the Vietnamese Current. The Vietnamese Current transfers coastal water masses in the summer mode (from south to north) within the anticyclonic circulation and in the winter mode (from north to south) within the cyclonic circulation. Keywords: South China Sea, Vietnamese Current, atmospheric processes, water circulation, cyclone, anticyclone, hydrodynamic structures, numerical modeling DOI: 10.1134/S0001433820040106
INTRODUCTION Vietnam occupies a relatively narrow coastal strip of Indochina, bounded by the South China Sea in the east. Therefore, the hydrodynamic regime of this basin is critical to shaping the climatic and weather conditions for the adjacent territory of Vietnam. In turn, this significantly affects many social and economic aspects of this country [1–5]. The specific features of the continental mountainous terrain surrounding the South China Sea and the presence of a large number of islands in
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