FORMATION SPECIFICITY OF SOUND VELOCITY FIELD UNDER INFLUENCE OF TYPHOONS ON THE SHELF OF THE SEA OF JAPAN (THE PETER THE GREAT BAY)
Authors
- Aleksandr N. Samchenko V.I. Il’ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia , Тихоокеанский океанологический институт имени В.И. Ильичёва ДВО РАН, г. Владивосток, Россия
- Igor O. Yaroshchuk V.I. Il’ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia , Тихоокеанский океанологический институт имени В.И. Ильичёва ДВО РАН, г. Владивосток, Россия
- Aleksandra V. Kosheleva V.I. Il’ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia , Тихоокеанский океанологический институт имени В.И. Ильичёва ДВО РАН, г. Владивосток, Россия
- Aleksandr A. Pivovarov V.I. Il’ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia , Тихоокеанский океанологический институт имени В.И. Ильичёва ДВО РАН, г. Владивосток, Россия
- Aleksey N. Shvyrev V.I. Il’ichev Pacific Oceanological Institute FEB RAS, Vladivostok, Russia , Тихоокеанский океанологический институт имени В.И. Ильичёва ДВО РАН, г. Владивосток, Россия
DOI:
https://doi.org/10.34753/HS.2022.4.1.23+ Keywords
+ Abstract
The paper presents the results of hydrological studies which we carried out on the shelf of the Peter the Great Bay of the Sea of Japan in July – August 2012, July – August 2017, August 2019 and August 2021. We have analyzed spatial variability of temperature and sound velocity fields, peculiar to the region, on the basis of hydrological CTD-data and the results of long-term measurements with anchored vertical thermostrings. In the course of measurements, we registered the following typhoons during theirpassageoff the coast of the Primorsky Territory of Russia:
Bolaven (August 28–29, 2012), Noru (August 7–8, 2017), Krosa (August 16, 2019),
Mirinae (August 7–9, 2021), Lupit (August 8–9, 2021), Omais (August 10–11, 2021). A significant change in the hydrological situation in the bay under the influence of extreme external factors is shown. Up to three mild thermoclines are observed in the bay in calm meteorological conditions. Its are located at depths of 8–15 m, 30–35 m, and 45–60 m in some cases, a thermocline with a large gradient was located at depths of 30–40 m. The temperature difference in the thermocline formed under the influence of typhoons was approximately 12–15°C per 10 m of depth. Apparently, the intensification of waves and surge of heated surface water in the Peter the Great Bay, caused by strong southerly and southwesterly winds, lead to the appearance of a pronounced near-bottom underwater sound channel. Since such changes affect the propagation of acoustic signals, they are especially important to study when working with autonomous underwater objects, their positioning and communicating with them.
+ Author Biographies
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Copyright (c) 2022 А.Н. Самченко, И.О. Ярощук, А.В. Кошелева, А.А. Пивоваров, А.Н. Швырев
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