Article
Oceanography
Olga A. Maznikova, Pavel O. Emelin, Artem Yu Sheibak, Mikhail A. Nosov, Alexei M. Orlov
Summary: Based on trawl surveys conducted by Russian research vessels, this study presents data on the distribution and behavior of walleye pollock in the western Chukchi Sea. The distribution of walleye pollock is influenced by water temperature, and different size groups are found in different areas and depths. The recent increase in pollock abundance is attributed to various factors including warming temperatures, decreasing ice cover, and increasing abundance in the Bering Sea. Commercial fishing in the western Chukchi Sea is not sustainable due to uncertainties in stock population, harsh climatic conditions, and logistical challenges.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2023)
Article
Oceanography
D. I. Frey, V. A. Krechik, L. D. Bashirova, S. A. Ostroumova, D. A. Smirnova, L. A. Kuleshova, E. P. Ponomarenko, E. G. Morozov, M. Ligi, I. Yu. Dudkov, V. V. Sivkov
Summary: Strong acceleration of abyssal flows in narrow deep-water channels and fracture zones is a key feature of bottom circulation in the Atlantic Ocean. The main pathway for Antarctic waters in the Equatorial Atlantic is the Romanche Fracture Zone, and our survey provided the first observational evidence of intense flow into the Vema Deep. The flow splits into branches at the sill, with the northern channel being the main pathway for the coldest and densest bottom waters to the Vema Deep. We estimated the total transport of Antarctic Bottom Water through the Romanche Fracture Zone at this location to be 1.40 Sv, with velocities exceeding 10 cm/s at depths greater than 5,000 m.
JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
(2023)
Article
Engineering, Marine
Alexander A. A. Komissarov, Denis V. V. Makarov, Andrey O. O. Kholmogorov, Renat B. B. Shakirov
Summary: This paper investigates low-frequency sound propagation in a 10-km long waveguide crossing a giant pockmark and presents a new method of acoustic waveguide scanning based on measurement of the wavefield propagator. This method allows for exploration of attenuation anomalies associated with the gas-saturated bottom region. By identifying beams that enter the pockmark area and experience strong losses, as well as beams that avoid pockmark-assisted losses, one can estimate probable locations of the pockmark segment in the waveguide.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Stanislav Myslenkov, Ksenia Silvestrova, Viktor Krechik, Mariia Kapustina
Summary: This study investigates the applicability of the simplified Ekman upwelling criterion method in the southeastern Baltic Sea. The upwelling criterion is the ratio of vertical velocity to the mixed layer density. Comparison with in situ temperatures shows that only 46% of calculated upwelling cases were confirmed. It is recommended to make improvements for future upwelling research.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Oceanography
Olga A. Maznikova, Pavel O. Emelin, Alexey A. Baitalyuk, Elena V. Vedishcheva, Anastasiya O. Trofimova, Alexei M. Orlov
Summary: Integrated pelagic trawl surveys conducted from 2003 to 2018 in the eastern sector of the Russian Arctic provided data on the biology and spatial distribution of Polar cod (Boreogadus saida) in the region. Polar cod in the surveyed areas showed similar size and distribution patterns. Their growth rates were lower in the eastern sector due to different environmental conditions, particularly temperature. In the Chukchi and East Siberian seas, polar cod concentrations were primarily found near the bottom, while in the Laptev Sea, they were distributed throughout the water column.
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
(2023)
Article
Fisheries
A. M. Orozco-Ruiz, C. Galvan-Tirado, A. M. Orlov, S. Y. Orlova, F. J. Garcia-De Leon
Summary: In this study, the genetic structure of sablefish in the North Pacific was examined using mitochondrial DNA and microsatellite markers. Contrary to previous proposals, the findings suggest that sablefish do not constitute a single population throughout their distribution. Ancient divergence in mtDNA was observed, which differentiates the North Pacific West Coast from other sample sites, and microsatellite markers reveal contemporary isolation of Mexican sablefish. These genetic differences between localities highlight the need for further investigation to fully understand the interconnectedness between populations.
ICES JOURNAL OF MARINE SCIENCE
(2023)
Article
Environmental Sciences
Vladimir A. A. Dulov, Ekaterina V. V. Skiba, Arseny A. A. Kubryakov
Summary: In this paper, the problem of foam coverage dependence on wave fetch in satellite microwave radiometry was investigated. The study applied the classical approach to studying developing waves and included two scenes of intensive katabatic winds. Landsat OLI images were used to extract wave spectral peak frequency and sea fraction covered by foam along the wave fetch. The results showed that the sea surface covered with foam grows about three times with the power law along the fetch. A simple model of foam coverage growth with wave fetch was proposed, which explained the observations quantitatively. The reported results can be applied to investigating tropical cyclones using satellite microwave radiometry.
Article
Environmental Sciences
Andrei Kholmogorov, Vladimir Ponomarev, Nadezhda Syrbu, Svetlana Shkorba
Summary: Dissolved methane in seawater plays an important role in determining potential oil and gas deposit areas and identifying pollution areas and biological communities. Understanding methane transport mechanisms helps to understand global greenhouse gas emissions from oceans.
Article
Biochemistry & Molecular Biology
Natalia Repkina, Svetlana A. Murzina, Viktor P. Voronin, Natalia Kaznina
Summary: This study investigated the effects of methyl jasmonate (MJ) on wheat seedlings and the fatty acid (FA) content of leaves under optimal and cadmium (Cd) stress conditions. The results showed that MJ had no effect on the height and net photosynthesis rate under optimal growth conditions, but it increased biomass accumulation and net photosynthesis rate under Cd stress. The positive effects of MJ may be associated with lower Cd content and higher alpha-linoleic acid (ALA) content in leaves.
Article
Engineering, Marine
Nikolai B. Korostelev, Igor V. Maltsev, Alexei M. Orlov
Summary: This study presents the first data on the growth and age of Schmidt's cod, a rare and poorly studied member of the Moridae family. The research focused on the Emperor Seamounts area and investigated the age, growth rates, and longevity of this species. The analysis involved examining annual growth increments on sagittal otoliths. The results showed that Schmidt's cod can live up to 49 years, with a mean age of 31.5 years, emphasizing its long lifespan and slow growth.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Sergey A. Mosharov, Elena I. Druzhkova, Andrey F. Sazhin, Pavel V. Khlebopashev, Anastasia N. Drozdova, Nikolay A. Belyaev, Andrey I. Azovsky
Summary: Knowledge of the structure and productivity of Arctic marine planktonic algae communities is crucial to understanding potential changes in the pelagic ecosystem in the Kara Sea under climate change. This study found that species diversity, phytoplankton abundance, and algal production were highest at the beginning of summer during ice melting. The study was conducted in the southwestern Kara Sea and estuarine zone of the Ob and Yenisei rivers from June 29 to July 15, 2018. Factors such as silicate content and salinity were found to influence phytoplankton abundance and productivity.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Meteorology & Atmospheric Sciences
Alexei M. Orlov, Svetlana Yu. Orlova, Maxim O. Rybakov, Olga R. Emelianova, Elena V. Vedishcheva
Summary: This article reports the first documented occurrence of a northern wolffish specimen in the Siberian Arctic, Laptev Sea, Russia, measuring 393 mm in length. Species identification was confirmed through examination of its external morphology and DNA barcoding. While widely distributed in the North Atlantic, records of this species in the Arctic Ocean have been limited to the Canadian and US coasts. The discovery suggests a significant range extension of approximately 7500 km, potentially resulting from the transport of a pelagic juvenile specimen from the Northeastern Atlantic to the Laptev Sea by the North Atlantic current, supporting the hypothesis of Atlantification of the Arctic Ocean.
Article
Environmental Sciences
Arseny Kubryakov, Anna Aleskerova, Evgeniy Plotnikov, Artem Mizyuk, Alesya Medvedeva, Sergey Stanichny
Summary: High- and medium-resolution satellite optical imagery shows that submesoscale cyclonic eddies can trap coastal waters and induce their rapid cross-shelf transport. This phenomenon may cause intense short-period cross-shelf transport of biological and chemical characteristics in coastal waters, thereby affecting the functioning of marine ecosystems.
Article
Oceanography
A. A. Latushkin, V. I. Ponomarev, P. A. Salyuk, D. I. Frey, N. A. Lipinskaya, S. P. Shkorba
Summary: The purpose of this study is to investigate the distribution characteristics of hydrooptical and hydrological features in the Antarctic Sound at different scales based on contact and satellite measurements conducted in the 87th cruise of the R/V Akademik Mstislav Keldysh in January 2022. The analysis of oceanographic station data and satellite data revealed the main features of mesoscale circulation within the cyclonic gyre and the presence of alternating anticyclonic and cyclonic eddies in the Antarctic Sound. In addition, a zone of increased turbidity was detected in the ice drift area, which was attributed to terrigenous suspension entering the water during ice melting. The different-scale eddies and currents in the Antarctic Sound contribute to water exchange between upper and deep layers and between Weddell Sea water and Bransfield Straight waters.
PHYSICAL OCEANOGRAPHY
(2023)
