hydrophysicsФундаментальная и прикладная гидрофизикаFundamental and Applied Hydrophysics2073-66732782-5221St. Petersburg Research Center of the Russian Academy of Scienceshydrophysics-854Research ArticleГИДРОФИЗИЧЕСКИЕ И БИОГЕОХИМИЧЕСКИЕ ПОЛЯ И ПРОЦЕССЫHYDROPHYSICAL AND BIOGEOCHEMICAL FIELDS AND PROCESSESЦиркуляция вод Южно-Китайского моря в зоне Вьетнамского течения в условиях южного тропического циклона весной 1999 г.: результаты численного моделированияThe water circulation of the South China Sea in a zone of the Vietnamese Сurrent under the influence of southern tropical cyclone in spring of 1999: results of numerical modelingВласоваГ. А.VlasovaG. A.

г. Владивосток

Vladivostok

gavlasova@mail.ruНгуенБа СуанNguyenBa Xuan

г. Нячанг

Nha Trang

ДеменокМ. Н.DemenokM. N.

г. Владивосток

Vladivostok

Тихоокеанский океанологический институт им. В.И. Ильичева ДВО РАНРоссияV. I. Il'ichev Pacific Oceanological Institute FEBRASRussian FederationИнститут океанографии Вьетнамской Академии наук и технологийВьетнамInstitute of Oceanography, Vietnamese Academy of Science and Technology (IO VAST)Viet Nam201618112022942534Copyright © Власова Г.А., Нгуен Б., Деменок М.Н., 20222022Власова Г.А., Нгуен Б., Деменок М.Н.Vlasova G.A., Nguyen B., Demenok M.N.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://hydrophysics.spbrc.ru/jour/article/view/854

На основе численного моделирования рассчитана интегральная циркуляция вод Южно-Китайского моря в зоне прибрежного Вьетнамского течения в переходный весенний период (май 1999 г.). Южно-Китайское море оказывает существенное влияние на климатический режим стран Юго-Восточной Азии, включая Дальний Восток России. Здесь развиваются тропические циклоны разрушительной силы, приходящие с западной части Тихого океана или зарождающиеся в самом Южно-Китайском море. Указанный год выбран в связи с проведением в этот период крупномасштабной международной экспедиции Рыболовной Ассоциации стран Юго-Восточной Азии и Японии, данные которой представлены вьетнамскими коллегами. Весенний сезон использован как пример перехода от зимнего периода к летнему в силу своей малой изученности. Синоптические процессы в данном регионе значимо влияют на сезонный характер Вьетнамского течения. Зимой под воздействием северо-восточного муссона это течение направлено с севера на юг, вследствие чего формируется циклоническая циркуляция вод; летом при юго-западном муссоне течение направлено в обратную сторону, формируя антициклоническую циркуляцию. Расчеты выполнены для синоптической ситуации, которая характеризуется наличием тропического циклона в южной части Южно-Китайского моря. Результаты моделирования показали, что в указанный период здесь существуют два антициклонических и разделяющий их циклонический круговороты. Вследствие этого в пределах Вьетнамского течения образуются две зоны различной модификации вод: в его северной и южной частях водные массы переносятся с юга на север (летний режим), а в центральной части — с севера на юг (зимний режим). На этом основании сделан вывод о переходном характере выбранного временного интервала, когда сказывается влияние еще не ушедшего зимнего и уже наступающего летнего муссонов.

The integrated water circulation of the South China Sea in the area of coastal Vietnamese Current during transitional spring period (May 1999) has been calculated on the basis of numerical modeling. The South China Sea considerably influences the climate regime in South-East Asia, including the Far East of Russia. Here the tropical cyclones of the destructive power coming from the western Pacific or incipient in the South China Sea are developed. This specified year was selected in connection with this period of large-scale international expedition Fisheries Association of South-East Asia and Japan, the data of which are presented by Vietnamese colleagues. Spring season is used as an example of the transition from winter to summer because it’s poorly investigated. Synoptic processes in the region significantly influence the seasonal the nature of Vietnamese Сurrent. This current is directed from north to south in winter under the influence of the northeast monsoon, thus forming the cyclonic water circulation. This current is directed in the opposite direction in the summer under the influence of the southwest monsoon, forming an anticyclonic circulation. The calculations were performed for the synoptic situation, which is characterized by the presence of tropical cyclone in the southern part of the South China Sea. Results of modeling have showed that two anticyclonic and separating its cyclonic gyres exist in the specified period in the studied area. As a result, two zones of different water modifications within the Vietnamese Current are formed: water masses are transported from south to north in the northern and southern parts of the region (summer regime), and in the central part — from north to south (winter regime). On this basis, it was concluded about a transitional character of the chosen time interval when influence has not yet left winter and already coming summer monsoons affects.

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The authors declare that there are no conflicts of interest present.