FEATURES OF ECOLOGY AND FISHING OF THE SMALL-MOUTHED SEA SMELT HYPOMESUS JAPONICUS IN THE NORTH-OKHOTSK SEA SUBZONE OF THE SEA OF OKHOTSK

2021 ◽  
Author(s):  
M.V. Rakitina ◽  
A.A. Smirnov
Keyword(s):  
Sea Of Okhotsk ◽  
Okhotsk Sea ◽  
The Sea Of Okhotsk ◽  
The North

scholarly journals PECULIARITIES OF BOTTOM FISH TRADE (HALIBUT, SKATE, GIANT GRENADIE, COD, LYCODES, BROADBANDED THORNYHEAD) IN THE NORTH OKHOTSK SEA FISHING SUBZONE OF THE SEA OF OKHOTSK IN 2019

Fisheries ◽  
2020 ◽  
Vol 2020 (2) ◽  
pp. 43-50
Author(s):  
Yuri Semenov ◽  
Julia Elatinceva ◽  
Andrey Smirnov ◽  
Andrey Tkachenko
Keyword(s):  
Sea Of Okhotsk ◽  
Okhotsk Sea ◽  
The Sea Of Okhotsk ◽  
The North ◽  
Bottom Fish ◽  
Fish Trade

Based on the materials collected in 2019, the authors consider some peculiarities of bottom fish fishing (halibut, stingrays, giant grenadie, cod, lycodes, and broadbanded thornyhead) in the North Okhotsk subzone of the Sea of Okhotsk. The accompanying problems are shown; the measures to optimize fishing are proposed.

scholarly journals Evidence of change in the sea of okhotsk: Implications for the north pacific

2003 ◽  
Vol 41 (1) ◽  
pp. 49-63 ◽  
Author(s):  
Katherine L. Hill ◽  
Andrew J. Weaver ◽  
Howard J. Freeland ◽  
Alexander Bychkov
Keyword(s):  
North Pacific ◽  
Sea Of Okhotsk ◽  
The Sea Of Okhotsk ◽  
The North ◽  
The North Pacific

Identification of Density-Stratified Waters in the Late-Pleistocene North Atlantic: A faunal Derivation

1983 ◽  
Vol 20 (3) ◽  
pp. 374-386 ◽  
Author(s):  
Joseph J. Morley
Keyword(s):  
Late Pleistocene ◽  
North Atlantic ◽  
Sea Of Okhotsk ◽  
Species Abundance ◽  
High Abundance ◽  
Northwest Pacific ◽  
The Sea Of Okhotsk ◽  
The North ◽  
The North Atlantic ◽  
Subsurface Temperatures

An expanded study of the radiolarian Cycladophora davisiana in late-Pleistocene North Atlantic marine sediments shows that over the last several hundred thousand years this species exhibits large variations in relative abundance. The C. davisiana curves in the North Atlantic cores are quite similar, with easily recognizable features common to all records. Minor deviations from the general pattern of this species' abundance apparently reflect the response of C. davisiana to specific oceanographic conditions characteristic of a particular area within the North Atlantic. C. davisiana occurs today in high abundance (>20%) only in the Sea of Okhotsk. Extensive winter and early spring sea-ice cover coupled with low surface-water salinities during summer and fall is responsible for maintaining near-freezing subsurface temperatures in this northwest Pacific marginal sea as well as relatively stable temperatures and salinities at depths below a shallow subsurface temperature minimum. During periods in the late Pleistocene, high C. davisiana abundances (>20%) in the North Atlantic were probably associated with oceanographic properties similar to those that exist in the Sea of Okhotsk today. Because of the relationship between relatively stable subsurface temperatures and salinities and high abundance levels of C. davisiana, analysis of this species' abundance pattern at several locations throughout the high-latitude North Atlantic should assist in identifying source areas of deep-water formation and determining the duration of deep convective processes at these sites.

scholarly journals Tidally modified western boundary current drives interbasin exchange between the Sea of Okhotsk and the North Pacific

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hung-Wei Shu ◽  
Humio Mitsudera ◽  
Kaihe Yamazaki ◽  
Tomohiro Nakamura ◽  
Takao Kawasaki ◽  
...  
Keyword(s):  
North Pacific ◽  
Sea Of Okhotsk ◽  
Western Boundary Current ◽  
Western Boundary ◽  
Boundary Current ◽  
Exchange Flows ◽  
The Sea Of Okhotsk ◽  
The North ◽  
Interbasin Exchange ◽  
The North Pacific

AbstractThe interbasin exchange between the Sea of Okhotsk and the North Pacific governs the intermediate water ventilation and fertilization of the nutrient-rich subpolar Pacific, and thus has an enormous influence on the North Pacific. However, the mechanism of this exchange is puzzling; current studies have not explained how the western boundary current (WBC) of the subarctic North Pacific intrudes only partially into the Sea of Okhotsk. High-resolution models often exhibit unrealistically small exchanges, as the WBC overshoots passing by deep straits and does not induce exchange flows. Therefore, partial intrusion cannot be solely explained by large-scale, wind-driven circulation. Here, we demonstrate that tidal forcing is the missing mechanism that drives the exchange by steering the WBC pathway. Upstream of the deep straits, tidally-generated topographically trapped waves over a bank lead to cross-slope upwelling. This upwelling enhances bottom pressure, thereby steering the WBC pathway toward the deep straits. The upwelling is identified as the source of joint-effect-of-baroclinicity-and-relief (JEBAR) in the potential vorticity equation, which is caused by tidal oscillation instead of tidally-enhanced vertical mixing. The WBC then hits the island chain and induces exchange flows. This tidal control of WBC pathways is applicable on subpolar and polar regions globally.

scholarly journals Attributing Causes of 2015 Record Minimum Sea-Ice Extent in the Sea of Okhotsk

2017 ◽  
Vol 30 (12) ◽  
pp. 4693-4703 ◽  
Author(s):  
Seungmok Paik ◽  
Seung-Ki Min ◽  
Yeon-Hee Kim ◽  
Baek-Min Kim ◽  
Hideo Shiogama ◽  
...  
Keyword(s):  
Sea Ice ◽  
Sea Of Okhotsk ◽  
Coupled Model ◽  
Internal Variability ◽  
Cmip5 Models ◽  
External Forcing ◽  
Sea Ice Extent ◽  
The Sea Of Okhotsk ◽  
The North

In 2015, the sea ice extent (SIE) over the Sea of Okhotsk (Okhotsk SIE) hit a record low since 1979 during February–March, the period when the sea ice extent generally reaches its annual maximum. To quantify the role of anthropogenic influences on the changes observed in Okhotsk SIE, this study employed a fraction of attributable risk (FAR) analysis to compare the probability of occurrence of extreme Okhotsk SIE events and long-term SIE trends using phase 5 of the Coupled Model Intercomparison Project (CMIP5) multimodel simulations performed with and without anthropogenic forcing. It was found that because of anthropogenic influence, both the probability of extreme low Okhotsk SIEs that exceed the 2015 event and the observed long-term trends during 1979–2015 have increased by more than 4 times (FAR = 0.76 to 1). In addition, it is suggested that a strong negative phase of the North Pacific Oscillation (NPO) during midwinter (January–February) 2015 also contributed to the 2015 extreme SIE event. An analysis based on multiple linear regression was conducted to quantify relative contributions of the external forcing (anthropogenic plus natural) and the NPO (internal variability) to the observed SIE changes. About 56.0% and 24.7% of the 2015 SIE anomaly was estimated to be attributable to the external forcing and the strong negative NPO influence, respectively. The external forcing was also found to explain about 86.1% of the observed long-term SIE trend. Further, projections from the CMIP5 models indicate that a sea ice–free condition may occur in the Sea of Okhotsk by the late twenty-first century in some models.

scholarly journals YAKUTIA

2019 ◽  
pp. 224-231 ◽  
Author(s):  
B. Koz’min ◽  
Sergey Shibaev
Keyword(s):  
Sea Of Okhotsk ◽  
Seismic Energy ◽  
The Arctic ◽  
Seismic Events ◽  
Macroseismic Data ◽  
Eurasian Plate ◽  
Epicentral Zone ◽  
The Sea Of Okhotsk ◽  
The North ◽  
Earthquake Focal Mechanism

. The paper presents the results of monitoring seismicity in Yakutia in 2013 based on the data from 24 digital seismic stations. A total of 5197 seismic events with Кp=6–15 are detected. A map of earthquake epicenters is compiled showing their distribution in different areas. Two major clusters of seismic events are recognized. The first one corresponds to the Arctic-Asian seismic belt (AASB) extending across the Laptev Sea shelf and the north eastern Asian continent towards the Sea of Okhotsk. The second Baikal–Stanovoy belt in the south of the region is traced from Lake Baikal through the Stanovoy Highlands and the Stanovoy Ridge to the Sea of Okhotsk. In South Yakutia, the Olekma–Stanovoy zone (OSZ), which makes the eastern part of the belt, is considered. Both belts form boundaries of major lithospheric plates. The first belt separates the Eurasian and North American plates, while the other divides the Eurasian plate from the Amurian one. The minimum seismic level is recorded within the OCZ, with no more than 0.04 % of the total seismic energy re-leased during 2013. The maximum seismicity is noted in the AASB with released energy making up 99.9 % of the total amount. That abrupt change in seismicity is due to the occurrence here of three strong earth-quakes, Ulakhan-Chistay, Ilin-Tas (Abyi), and Tas-Khayakhtakh with the intensities VII-IX in the epicenters (MS=4.9–6.9). The epicentral zone of the Tas-Khayakhtakh event (MS=4.9) that occurred on May, 2013 is considered in more detail. The motion in the source of this event indicate thrusting along the Dogdo fault. All the shakes took place within the Chersky Range, in the zone of influence of major faults of the Kolyma–Indigirka system (Ulakhan, Dogdo, Ilin–Tas) under conditions of NE compression (regime of interplate collision and transpression ). Seismotectonic relations, macroseismic data, and earthquake focal mechanism pa-rameters are discussed.

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