scholarly journals ACOUSTIC NONLINEARITY OF THE UPPER OCEAN LAYER

2020 ◽  
Author(s):  
В.А. Буланов ◽  
И.В. Корсков
Keyword(s):  
Peter The Great Bay ◽  
Acoustic Parameter ◽  
The Sea Of Japan ◽  
Near Surface ◽  
The North ◽  
Peter The Great ◽  
Nonlinear Acoustic Parameter ◽  
Ocean Layer ◽  
The Indian Ocean ◽  
Nonlinear Acoustic

Представлены результаты исследований нелинейного акустического параметра воды в верхнем слое океана. Метод измерений основан на использовании параметрической генерации звука на различных разностных частотах при бигармоническом излучении высокочастотной накачки. Измерения нелинейного акустического параметра проводились в различные годы в приповерхностном слое в северо-западной части Тихого океана, в верхнем слое до глубины 100 м в Индийском океане, а также на шельфе Японского моря, в бухте Витязь залива Петра Великого. The results of studies of the nonlinear acoustic parameter of water in the upper layer of the ocean are presented. The measurement method is based on the use of parametric sound generation at different difference frequencies under biharmonic radiation of high-frequency pumping. Measurements of the nonlinear acoustic parameter were carried out in various years in the near-surface layer in the North-Western Pacific Ocean, in the upper layer up to a depth of 100 m in the Indian ocean, as well as on the shelf of the Sea of Japan, in the Vityaz Bay of Peter the Great Bay.

scholarly journals Preliminary results of integrated oceanographic and geophysical observations in the profile of Peter the Great Bay – Tsushima Strait (the Sea of Japan, October 2019)

2020 ◽  
Author(s):  
А.А. ЛЕГКОДИМОВ ◽  
М.А. БОВСУН ◽  
Д.А. ШВАЛОВ ◽  
Г.И. МИШУКОВА ◽  
М.В. ИВАНОВ ◽  
...  
Keyword(s):  
Sea Of Japan ◽  
Flow System ◽  
Peter The Great Bay ◽  
The Sea Of Japan ◽  
Near Surface ◽  
Atmospheric Air ◽  
Tsushima Strait ◽  
Intensity Measurements ◽  
Peter The Great ◽  
Complex Methods

Наиболее оперативную информацию о состоянии океана дает проведение комплексных исследований (гравиметрические наблюдения, измерения интенсивности флуоресценции, концентрации метана и хлорофилла-а в приповерхностном слое воды, ртути и газов в атмосферном воздухе) непосредственно во время следования судна. Наши исследования проводились на переходе Владивосток–Нячанг в период с 27 по 29 октября 2019 г. в Японском море в рамках рейса LV88 на НИС «Академик М.А. Лаврентьев». Полученные данные отличаются высокой сходимостью с результатами прошлых экспедиций (например, рейс LV84, 2018 г.). Нами выявлены зоны аномальных концентраций метана (8,3 нмоль/л), углекислого газа (2,3 ppm) и ртути (4 нг/м3), а также отмечены гравитационные аномалии в Корейском проливе. The study of the ocean by complex methods using a flow system and atmospheric air is currently one of the universal methods of obtaining express results (such as gravimetric observations, fluorescence intensity measurements, methane and chlorophyll-a concentrations in near-surface water, mercury and various gases in open air) directly during the vessel’s sailing. The studies were conducted on the Vladivostok – Nha Trang traverse during October 27–29, 2019 in the Sea of Japan as a part of the LV88 voyage aboard the R/V “Academic M.A. Lavrent’yev”. According to the results of the study, abnormal zones of concentrations of methane (8.3 nM/l), carbon dioxide (2.3 ppm) and mercury (4 ng/m3) were identified. We have also noted gravitation anomalies in the Korean Strait.

The large-scale vegetation maps of the western coast of Peter the Great Bay (Far East, the Sea of Japan)

2000 ◽  
pp. 50-61 ◽  
Author(s):  
S. V. Osipov ◽  
V. P. Verkholat
Keyword(s):  
Vegetation Cover ◽  
Large Scale ◽  
Far East ◽  
Peter The Great Bay ◽  
The Sea Of Japan ◽  
Western Coast ◽  
Spatial Unit ◽  
Peter The Great ◽  
Great Bay ◽  
River Valleys

Two territories on the western coast of Peter the Great Bay were mapped in the large scale. The geobotanical mapping means revealing and displaying the essential regularities of vegetation cover. Both the spatial and temporal regularities of vegetation under natural and anthropogenic influences are well pronounced in the territory under consideration. The concept of the vegetation spatial unit (vegetation complexes) was applied as a basis for mapping. The maps and their legend were worked out as a system of vegetation combination types (vegetation combination is a spatial unit of the supracoenotic level). Such categories, as vegetation of tops and slopes, lowlands and river valleys, sea coasts reflect maximal contrasts in vegetation cover, so they are the highest level divisions of the map legend. Types of succession series and stages of series are developed for construction of the second and third levels of the legend. Communities, similar in ecotope, total species composition, saplings and some other characteristics, are referred to one type of series. 5 types of series have been distinguished: dry, fresh, moist, very moist, wet. The main factor of dynamics in considered territory is fire and the series are mainly pyrogeneous. Series are presented as sequences of vegetation stages. The vegetation stages for tops and slopes are: closed low forest — open low woodland — shrub thicket with saplings — meadow with saplings, for lowlands and river valleys they are: open low woodland — thicket of saplings — meadow or mire with saplings.

scholarly journals НИЗКОЧАСТОТНЫЕ ЭКСПЕРИМЕНТАЛЬНЫЕ АКУСТИЧЕСКИЕ ИССЛЕДОВАНИЯ НА ШЕЛЬФЕ  ЯПОНСКОГО МОРЯ (ЗАЛИВ ПЕТРА ВЕЛИКОГО)

2019 ◽  
Author(s):  
A.N. Samchenko ◽  
A.A. Pivovarov ◽  
A.N. Shvyrev ◽  
I.O. Yaroshchuk
Keyword(s):  
Inverse Problems ◽  
Experimental Work ◽  
Carrier Frequency ◽  
Peter The Great Bay ◽  
The Sea Of Japan ◽  
Acoustic Path ◽  
Geoacoustic Inversion ◽  
Peter The Great ◽  
Great Bay ◽  
Group Velocities

В статье обсуждаются результаты экспериментальных работ, проведенных в осенний период 2016 и 2017 гг. в заливе Петра Великого Японского моря. В экспериментах использовались низкочастотные гидроакустические излучатели с центральной несущей частотой 22 и 33 Гц и гидроакустического излучателя с центральной несущей частотой 240 Гц, прием сигналов осуществлялся на автономные гидроакустические станции (АГС), синхронизированные по времени. Акустические исследования проводились совместно с гидрологическими измерениями СТДзондом и заякоренными автономными термогирляндами. На основе результатов гидроакустических экспериментов, где использовались гидроакустические излучатели 22 и 33 Гц, показана возможность решения как обратных задач, так и геоакустической инверсии. Полученные в результате измерений групповые скорости различных мод позволяют провести оценки геоакустических свойств дна. Экспериментально показано, что на распространение сигналов с частотами более 200 Гц вдоль акустической трассы сильное влияние оказывает гидрология. Ключевые слова: Гидроакустика, геоакустическая модель, низкочастотный гидроакустический излучатель, залив Петра Великого.The paper discusses the results of experimental work carried out in the autumn period of 2016 and 2017 in Peter the Great Bay of the Sea of Japan. We used lowfrequency hydroacoustic emitters with a central carrier frequency of 22 and 33 Hz and a hydroacoustic emitter with a central carrier frequency of 240 Hz. The signals were registered at autonomous hydroacoustic stations (AHS) and were synchronized in time. Acoustic studies were supplemented with hydrological measurements obtained from CTD probe and moored autonomous thermostrings. The possibility of solving both inverse problems and geoacoustic inversion problems was shown basing on the results of hydroacoustic experiments by means of the hydroacoustic emitters at 22 and 33 Hz. The group velocities of different modes obtained as a result of measurements allowed us to estimate the geoacoustic properties of the bottom. It was experimentally proved that the propagation of signals with frequencies greater than 200 Hz along the acoustic path is strongly influenced by hydrology. Keywords: Hydroacoustic, geoacoustic model, lowfrequency hydroacoustic radiator, Peter the Great Bay.

The records of Pagurus trigonocheirus (Stimpson, 1858) (Crustacea: Decapoda: Paguridae) from the continental coasts of the Peter the Great Bay of the Sea of Japan with the list of hermit crab species from the area

Zootaxa ◽  
2020 ◽  
Vol 4869 (2) ◽  
pp. 275-280
Author(s):  
IVAN MARIN
Keyword(s):  
Sea Of Japan ◽  
Hermit Crab ◽  
Peter The Great Bay ◽  
Hermit Crabs ◽  
The Sea Of Japan ◽  
Crab Species ◽  
Exact Sampling ◽  
Peter The Great ◽  
Great Bay

The sublittoral hermit crab Pagurus trigonocheirus (Stimpson, 1858) (Crustacea: Decapoda: Paguridae) is recorded from depths of 80–200 m along the continental coastline of the Peter the Great Bay, Sea of Japan. The exact sampling localities as well as photographs of live specimens are presented in the paper. Doubtful records of hermit crabs from the southern Russian coastline of the Sea of Japan are also discussed. 

Admirandus multicavus and Adoncholaimus ussuriensis sp. n. (Nematoda: Enoplida: Oncholaimidae) from the Sea of Japan

Nematology ◽  
2015 ◽  
Vol 17 (10) ◽  
pp. 1229-1244 ◽  
Author(s):  
Vladimir Mordukhovich ◽  
Dmitry Atopkin ◽  
Natalia Fadeeva ◽  
Victoria Yagodina ◽  
Julia Zograf
Keyword(s):  
Sea Of Japan ◽  
Buccal Cavity ◽  
Mitochondrial Gene ◽  
Large Body ◽  
Peter The Great Bay ◽  
The Sea Of Japan ◽  
Scanning Electron Micrographs ◽  
Peter The Great ◽  
Dichotomous Key ◽  
C Subunit

A description of one new, and redescription of one known, species of the subfamily Adoncholaiminae (Nematoda: Oncholaimidae) from Peter the Great Bay (Sea of Japan) are provided. Adoncholaimus ussuriensis sp. n. is characterised by relatively large body size (L = 4.3-5.8 mm in male, 4.4-6.2 mm in female), a pair of terminal pores of the Demanian system opening dorsally at 147-189 μm (2.3-3.0 abd) anterior to the anus, excretory pore located posterior to buccal cavity region, absence of a ventral swelling on tail, long spicules (190-230 μm), presence of a gubernaculum (32-40 μm), presence of a complicated sensory field in the male with a complex supplementary organ and two sets of pilose filaments (5-10 μm long) on the posterior cloacal lobe and four rows of subventral and subdorsal postcloacal sensilla. We provide a redescription of Admirandus multicavus illustrated by light and scanning electron micrographs and propose Adoncholaimus chinensis as a junior synonym of Admirandus multicavus. The diagnoses of both genera are emended. Partial sequences of the mitochondrial gene cytochrome oxidase c subunit I (COI) and D2-D3 region of the 28S rDNA for both species were obtained. A dichotomous key to Adoncholaimus species is provided.

Sign in / Sign up

Export Citation Format

Share Document