Interseasonal variability in methane concentrations and its fluxes on water-atmosphere border in the western part of the Sea of Okhotsk

2019 ◽  
Vol 59 (6) ◽  
pp. 944-951
Author(s):  
A. I. Obzhirov ◽  
G. I. Mishukova ◽  
R. B. Shakirov ◽  
V. F. Mishukov ◽  
E. V. Maltseva ◽  
...  
Keyword(s):  
Sea Of Okhotsk ◽  
Sea Water ◽  
Methane Flux ◽  
Water Area ◽  
Average Wind Speed ◽  
The Sea Of Okhotsk ◽  
Average Wind ◽  
Methane Fluxes ◽  
Interseasonal Variability ◽  
First Time

For the first time subannual variability of methane fluxes on the water-atmosphere border in the water area of the Sea of Okhotsk, located eastward to Sakhalin Island, is shown. Variability of methane fluxes is determined by the presence and activity of submarine methane sources and is connected to the seasonal changes in hydrological and hydrochemical parameters of the sea water and the structure of of currents in the region under study. In spring and autumn the average fluxes are higher, than in the summer period. Within the summer modification of water and increase of stratification, the methane flux from the sea surface is reduced. In autumn, as a result of the autumnal convection of water and high average wind speed, methane, accumulated in transitional waters, is emitted into the atmosphere.

scholarly journals Methane flux and gas hydrate accumulations in the Sea of Okhotsk and their ecological aspects

2021 ◽  
Vol 43 (3) ◽  
Author(s):  
N.L. Sokolova ◽  
Yu. A. Telegin ◽  
A.I. Obzhirov
Keyword(s):  
Natural Gas ◽  
Gas Hydrates ◽  
Gas Hydrate ◽  
Sea Of Okhotsk ◽  
World Ocean ◽  
Direct Methods ◽  
Methane Flux ◽  
Methane Cycle ◽  
The Sea Of Okhotsk ◽  
Methane Fluxes

Methane is one of the important representatives of the organic substances in the atmosphere (for example, an increase of methane content in the atmosphere can affect enhancing the greenhouse effect). Gas hydrates are an essential part of links in the methane cycle and the accompanying fluxes of other gases. The research object in this paper is the Sea of Okhotsk, where gas hydrate fields and active submarine gas discharge areas were found. The study of methane fluxes is relevant both for the Sea of Okhotsk and the World Ocean. From 1984 to 2015, the background and anomalous methane fields were explored in the Sea of Okhotsk as a result of gas geochemical research carried out by scientists of the Gasgeochemistry Laboratory (POI FEB RAS). The flux of natural gas became stronger from the sources to the seafloor, from the seafloor to the water, and, finally, to the atmosphere due to renew of fault zones. Moreover, the amount of methane vents on the Sakhalin slope has increased from 2-3 vents to more than 400. The most representative hydroacoustic anomalies “flares” mapped direct methods study methane hydrates. The received outcomes indicate the urgency of the study of methane fluxes and the formation-dissociation mechanism of gas hydrates, and the influence of natural gas from hydrocarbon sources on the environment.

Contribution to the flora of marine algae of the coastal zone of the northeastern part of the Sea of Okhotsk

2018 ◽  
Vol 52 (1) ◽  
pp. 63-73
Author(s):  
N. V. Evseeva
Keyword(s):  
Coastal Zone ◽  
Sea Of Okhotsk ◽  
Marine Algae ◽  
Herbarium Material ◽  
Northeastern Part ◽  
The Sea Of Okhotsk ◽  
The Family ◽  
First Time

The revision of the herbarium material, collected in the northern part of the Sea of Okhotsk in 1965–1966 and stored in VNIRO, allowed to expand the taxonomic list of macrophyte algae of the coastal zone of this area. The locations of discovery of 24 previously unmentioned species are described. Myrionema balticum, Ulvella repens, Syncoryne reinkei, Acrochaetium arcuatum were found in the Sea of Okhotsk for the first time. Most species new for the Sea of Okhotsk is represented by epiphytes of the family Ulvellaceae (Chlorophyta). The final taxonomic list of this region, including literature data, consists of 169 species.

Decapodid stage of Neocrangon communis (Decapoda, Crangonidae) from the eastern part of the Sea of Okhotsk

2016 ◽  
Vol 25 (1) ◽  
pp. 13-22
Author(s):  
N.A. Sedova ◽  
S.S. Grigoriev
Keyword(s):  
Sea Of Okhotsk ◽  
General View ◽  
Characteristic Shape ◽  
The Sea Of Okhotsk ◽  
First Time ◽  
Distinguishing Features

For the first time the morphology of the decapodid stage of Neocrangon communis is described in detail. The decapodid can be distinguished from those of the genera Argis, Crangon, and Mesocrangon by the morphology of their telson, antennae, antennulae, and carapace. The main distinguishing features of the decapodid of N. communis were two spines on medial line of the carapace, a short rostrum, relatively wide scaphocerite, characteristic shape and length of the terminal setae on the telson. Drawings of general view and some limbs are presented.

scholarly journals Trends in sea surface temperature of the Sea of Okhotsk and adjacent water areas by satellite data in 1998–2017

2019 ◽  
pp. 55-61 ◽  
Author(s):  
D. M. Lozhkin ◽  
G. V. Shevchenko
Keyword(s):  
Surface Temperature ◽  
Sea Surface Temperature ◽  
Sea Of Okhotsk ◽  
Linear Trend ◽  
Heat Content ◽  
Water Area ◽  
Sea Surface ◽  
The Sea Of Okhotsk ◽  
Adjacent Water ◽  
Winter Convection

For the Sea of Okhotsk and the adjacent water areas, a series of mean monthly sea surface temperature values were computed from satellite measurements of 20 years (1998–2017). In each space cell, the coefficients of the linear trend are determined by the method of least squares. Such coefficients were calculated for each month separately, for the whole series as a whole, and also for average values of the temperature for the season. The relationship of these coefficients to the observed decrease in ice extent in the water area of the Sea of Okhotsk during the last twenty years has been analyzed. It is shown that the heat content of the surface layer in this basin decreases, most significantly in its northern and western parts. This trend is especially pronounced in the spring, which may be due to a decrease in ice cover and a more significant cooling of the waters due to winter convection.

Megalopa of Mesocrangon intermedia (Decapoda: Crangonidae) from the eastern part of the Sea of Okhotsk

2014 ◽  
Vol 23 (2) ◽  
pp. 188-196
Author(s):  
N.A. Sedova ◽  
S.S. Grigoriev
Keyword(s):  
Sea Of Okhotsk ◽  
General View ◽  
The Sea Of Okhotsk ◽  
First Time ◽  
Distinguishing Features ◽  
Antennal Scale

For the first time megalopa of Mesocrangon intermedia is described. The megalopa can be distinguished from that of the Crangon and Neocrangon by the morphology of its telson and carapace. The main distinguishing features of megalopa of M. intermedia were two spines on medial line of the carapace, a relatively long rostrum, a relatively narrow antennal scale, and the distinctive length of the terminal setae on the telson. Drawings of general view and individual limbs are presented.

First records from Pacific Mexico of the rare deep-water mysid Ceratomysis spinosa (Crustacea, Peracarida, Mysida, Petalophthalmidae)

2015 ◽  
Vol 8 ◽  
Author(s):  
Michel E. Hendrickx
Keyword(s):  
Deep Water ◽  
Bering Sea ◽  
Posterior Margin ◽  
Sea Of Okhotsk ◽  
Eastern Pacific ◽  
Western Coast ◽  
The Sea Of Okhotsk ◽  
Lateral Margins ◽  
First Time ◽  
The Bering Sea

The deep-water mysidCeratomysis spinosaFaxon, 1893, previously known from Panama, Japan, the Sea of Okhotsk, the Bering Sea and Alaska, USA is reported for the first time off the western coast of Mexico, in the eastern Pacific. The specimens, a male of 27.5 mm in total length (TL) and five females of 28.5–34.5 mm TL, were collected between depths of 1296 and 1580 m. The telson is illustrated, showing numerous setae on the lateral margins, and longer, robust setae in the distal third and on the posterior margin.

scholarly journals Excitation of seiches in ice at port water area of the sea of Okhotsk

2019 ◽  
Vol 486 (4) ◽  
pp. 475-479
Author(s):  
G. I. Dolgikh ◽  
D. P. Kovalev ◽  
P. D. Kovalev
Keyword(s):  
Numerical Simulation ◽  
Spectral Analysis ◽  
Dynamic System ◽  
Sea Of Okhotsk ◽  
Water Area ◽  
External Forcing ◽  
Sea Waves ◽  
Wave Processes ◽  
The Sea Of Okhotsk

Long term observations of sea waves with one second discreteness in the port harbor of Sea of Okhotsk (Sakhalin island) at a depth of about two meters under the ice were carried out using autonomous wave recorders in 2009-2017. Spectral analysis of the data showed the presence of several significant peaks on the periods from 2 to 15 seconds in the spectra for the moments of strong swell at sea. These peaks are caused by wave processes that are generated due to the nonlinear transformation of the swell coming in ice. The numerical simulation of the reaction of the dynamic system - the water area described by the Duffing equation, depending on the parameters included in the equation and determined from experimental observations, is carried out. It is shown, including using the Poincare mapping that the amplitude of external forcing has the greatest influence on the transition of the system to chaos.

Methane fluxes on the water–atmosphere boundary in the Sea of Okhotsk

2017 ◽  
Vol 475 (2) ◽  
pp. 963-967 ◽  
Author(s):  
G. I. Mishukova ◽  
R. B. Shakirov ◽  
A. I. Obzhirov
Keyword(s):  
Sea Of Okhotsk ◽  
The Sea Of Okhotsk ◽  
Methane Fluxes

scholarly journals New Records of Rare Psychrolutid Fishes (Psychrolutidae) in the Sea of Okhotsk

2021 ◽  
Vol 61 (5) ◽  
pp. 680-684
Author(s):  
P. A. Saveliev
Keyword(s):  
Rare Species ◽  
Sea Of Okhotsk ◽  
Pacific Coast ◽  
New Records ◽  
Kuril Islands ◽  
Northwestern Part ◽  
The Sea Of Okhotsk ◽  
The Pacific ◽  
Northern Pacific ◽  
First Time

Abstract Two rare species of psychrolutid fish (Psychrolutidae) were found in the Sea of Okhotsk. Psychrolutes dolganovi was found at a depth of 142 m near Urup Island (southern Kuril Islands); earlier the species was known only from the holotype collected off the Pacific coast of Iturup Island. This species is recorded in the Sea of Okhotsk for the first time. P. pustulosus was collected at depths of 205–400 m along central part of Kuril Islands and in the northwestern part of the Sea of Okhotsk at depths of 240–294 m. A key to the species of the genus Psychrolutes inhabiting the northern Pacific Ocean is presented.

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