Морской гидрофизический журнал. 2022; 38: 34-52
Особенности образования следов циклонов (колебаний температуры воды) в районе мыса Свободного, юго-восточная часть острова Сахалин
https://doi.org/10.22449/0233-7584-2022-1-34-52Аннотация
Цель. Цель работы – изучение особенностей формирования следов циклонов после регулярного прохождения циклонов над районом измерения волнения и оценка параметров внутренних волн в следе по данным натурных наблюдений.
Методы и результаты. Представлен анализ данных полевых наблюдений морских волн и температуры воды. Измерения проводились прибором АРВ-К14 (автономный регистратор волнения и температуры воды) в районе мыса Свободного на юго-восточном побережье острова Сахалин на глубине около 8 м. Полученные временны́е ряды колебаний уровня моря и температуры продолжительностью около полутора месяцев подвергались спектральному анализу с применением программных средств. Обнаружены доминирующие колебания температуры, достигающие 8,5 °C, c периодом 13,1 ч в верхнем квазиоднородном слое океана. Данные колебания были идентифицированы как следы циклонов в стадии их релаксации. Принимая во внимание синоптические обстоятельства, существующие во время прохождения нескольких циклонов и связанных с ними штормов в районе наблюдения, авторы исследовали наличие или отсутствие следа.
Выводы. Показано, что если следующий шторм приходит раньше, чем через 10 дней после предыдущего, то след может быть короче или даже отсутствовать из-за активного перемешивания воды в верхнем квазиоднородном слое океана. Значение коэффициента Î в выражении w = = (1 + Î) f, связывающего доминирующую частоту w внутренних волн, т. е. почти инерционных колебаний в следе за каждым тайфуном, с инерционной частотой f (параметром Кориолиса, определяемым географической широтой акватории, где распространяются волны), для полученных данных близко к значению, предложенному в работе Э. Кунзе. С использованием формулы Дж. Ф. Прайса определены характерные горизонтальные длины внутренних волн в направлении перемещения внутри следов циклонов, движущихся со скоростью 15–35 узлов. Эти длины составляют от 304,6 до 1066,1 км.
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Morskoy Gidrofizicheskiy Zhurnal. 2022; 38: 34-52
Features of Formation of the Cyclone Wakes (Fluctuations In Seawater Temperature) in the Area of Cape Svobodny, the Southeastern Part of the Sakhalin Island
https://doi.org/10.22449/0233-7584-2022-1-34-52Abstract
Purpose. The purpose of the work is to study the peculiarities of formation of the cyclone wakes after the regular passage of cyclones over the area of the wave measurements, and to estimate the internal wave parameters in the track according to the field observations.
Methods and Results. The analysis of data from the field observations of the sea waves and water temperature is presented. The measurements were carried out by the ARW-K14 device (autonomous recorder of the waves and water temperature) in the area of the Cape Svobodny on the southeastern coast of the Sakhalin Island at the depth about 8 m. The obtained time series of the sea level and temperature fluctuations lasting about one and a half months were subjected to spectral analysis using software. The dominant temperature fluctuations reaching 8.5 °C with a 13.1 h period were detected in the upper mixed layer of the ocean. These fluctuations were identified as the cyclone wakes in the
stage of their relaxation. Taking into account the synoptic circumstances that exist during the passage of several cyclones and the associated storms in the observation area, the authors investigated the presence or absence of a trace.
Conclusions. It is shown that if the next storm arrives earlier than 10 days after the previous one, the trace may be shorter or even absent due to active water mixing in the upper mixed layer of the ocean. As for the data obtained, the value of the coefficient Î in the expression w = (1 + Î) f, which connects the dominant frequency w of internal waves, i.e. almost inertial oscillations in the trace of each typhoon, with the inertial frequency f (the Coriolis parameter determined by the geographical latitude of the water area where the waves propagate), is close to the value proposed in the paper by E. Kunze. Using the formula of J. F. Price, the characteristic horizontal lengths of internal waves in the direction of movement inside the wakes of the cyclones moving at a speed 15–35 knots, are determined. These lengths rage from 304.6 to 1066.1 km.
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