Phytocenoses of the Ob Estuary and Kara Sea Shelf in the Late Spring Season     

Sukhanova  I. N.  Flint  M. V.  Sakharova  E. G.  Fedorov  A. V.  Makkaveev  P. N.  Nedospasov  A. A. 《Oceanology》2018,58(6):802-816

Oceanology - Based on the material obtained in the spring–summer season of 2016, the composition and quantitative distribution of phytoplankton in the Ob estuary and over the Kara Sea shelf...  相似文献   

Phytoplankton Community Structure in the Polar Front of the Eastern Barents Sea at the End of the Growth Season     

V. M. Sergeeva  L. S. Zhitina  S. A. Mosharov  A. A. Nedospasov  A. A. Polukhin 《Oceanology》2018,58(5):700-709

Phytoplankton community and its distribution were investigated in the south part of the Polar Front in the eastern Barents Sea in October 2014. Analysis of the spatial differences in the phytoplankton structure was performed in connection with changes of the temperature, salinity and biogenic regime. At the end of the growing season in the phytoplankton community was dominated by destruction processes and the concentration of nutrients in the upper mixed layer was higher than the limiting level. Coccolithophores (Emiliania huxleyi and Discosphaera cf. tubifer) dominanted over investigated area. The maximum values of abundance and biomass of coccolithophores reached 90.4 mln.cell/m³ and 30.8 mgC/m³, drawing up 82% of the total number and 93% of the total biomass of phytoplankton. Influence of transformed the waters of Atlantic origin was observed in the western part of the investigated area. The number of species in the phytoplankton community here was 1.5–2 times lower than in the eastern part of the occupied mostly by Barents Sea water. In the eastern part of the presence of large dinoflagellates Neoceratium spp. (Ceratium spp.) and Dinophysis spp., lower values of chlorophyll a concentration, a higher proportion of pheophytin in the amount of pigment chlorophyll + pheophytin, the high content of ammonia in the upper mixed layer showed that in this area the phytoplankton was at a later seasonal succession stage than the western part.  相似文献   

On the mechanism of wind-induced transformation of a river runoff water lens in the Kara Sea     

A. G. Zatsepin  P. O. Zavialov  V. I. Baranov  V. V. Kremenetskiy  A. A. Nedospasov  S. G. Poyarkov  V. V. Ocherednik 《Oceanology》2017,57(1):1-7

The paper describes a possible mechanism for the transformation of a desalinated water lens in the Kara Sea under the action of vertical turbulent mixing induced by wind. Using a simple one-dimensional model, we show that the strongest transformation occurs at the edge of the lens—its frontal zone, where the thickness of the desalinated layer is the smallest. Because of the strong (cubic) nonlinear dependence of the turbulent energy flux on the wind speed, significant transformation of the frontal zone of the lens occurs during storm events. A series of consecutive storms can cause horizontal lens fragmentation into several zones in which the salinity increases spasmodically towards the edge of the lens.  相似文献   

Structure of Phytocenoses of the Yenisei Estuary and Adjacent Kara Sea Shelf in Late Spring     

Sukhanova  I. N.  Flint  M. V.  Sakharova  E. G.  Fedorov  A. V.  Makkaveev  P. N.  Nedospasov  A. A. 《Oceanology》2020,60(6):748-764

Oceanology - The research is based on the materials collected during cruise 66 of R/V Akademik Mstislav Keldysh in the Yenisei estuary and over the adjacent Kara Sea shelf in the latitudinal range...  相似文献   

Structure of phytoplankton communities in the Yenisei estuary and over the adjacent Kara Sea shelf     

I. N. Sukhanova  M. V. Flint  V. M. Sergeeva  E. I. Druzhkova  A. A. Nedospasov 《Oceanology》2015,55(6):844-857

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Structural and Functional Characteristics of Zooplankton in the Ob Estuary and Adjacent Shelf Areas of the Kara Sea in Summer     

Drits  A. V.  Arashkevich  E. G.  Nedospasov  A. A.  Amelina  A. B.  Flint  M. V. 《Oceanology》2019,59(3):347-357

Oceanology - The study was carried out in the Ob estuary and the adjacent shelf of the Kara Sea in July 2016. For the first time data on the species composition, abundance and distribution as well...  相似文献   

Phytoplankton of the Khatanga Bay,Shelf and Continental Slope of the Western Laptev Sea     

Sukhanova  I. N.  Flint  M. V.  Fedorov  A. V.  Sakharova  E. G.  Artemyev  V. A.  Makkaveev  P. N.  Nedospasov  A. A. 《Oceanology》2019,59(5):648-657

Oceanology - The studies were conducted along the transect (11 stations) from the inner part of Khatanga Bay in the south to the Laptev Sea continental slope in the north in September 17—20,...  相似文献   

On the Structure of Water Exchange Between the Deep Northern and Shelf Southwestern Part of the Kara Sea over the Brusilov Sill     

Kremenetskiy  V. V.  Nedospasov  A. A.  Shchuka  S. A.  Shchuka  A. S.  Zamyatin  I. A.  Bondar  A. V. 《Oceanology》2021,61(6):786-790

Oceanology - During cruise 81 of the R/V Akademik Mstislav Keldysh comprehensive studies of the Kara Sea were carried out over sill separating the central spur of the St. Anna Trough and the Novaya...  相似文献   

The structure of phytoplankton communities in the eastern part of the Laptev Sea     

I. N. Sukhanova  M. V. Flint  E. Ju. Georgieva  E. K. Lange  M. D. Kravchishina  A. B. Demidov  A. A. Nedospasov  A. A. Polukhin 《Oceanology》2017,57(1):75-90

Studies have been performed on a transect along 130°30′ E from the Lena River delta (71°60′ N) to the continental slope and adjacent deepwater area (78°22′ N) of the Laptev Sea in September 2015. The structure of phytoplankton communities has distinct latitudinal zoning. The southern part of the shelf (southward of 73°10′ N), the most desalinated by riverine discharge, houses a phytoplankton community with a biomass of 175–840 mg/m², domination of freshwater Aulacoseira diatoms, and significant contribution of green algae (both in abundance and biomass). The northern border for the distribution range of the southern complex of phytoplankton species lies between the 8 and 18 psu isohalines (~73°10′ N). The continental slope and deepwater areas of the Laptev Sea (north of 77°30′ N), with a salinity of >27 psu in the upper mixed layer, are populated by the community prevalently composed of Chaetoceros and Rhizosolenia diatoms, very abundant in the Arctic, and dinoflagellates. The phytoplankton number in this area fall in the range of 430–1100 × 10⁶ cell/m², and the biomass, in the range of 3600 mg/m². A moderate desalinating impact of the Lena River discharge is observed in the outer shelf area between 73°20′ and 77°30′ N; the salinity in the upper mixed layer is 18–24 psu. The phytocenosis in this area has a mosaic spatial structure with between-station variation in the shares of different alga groups in the community, cell number of 117–1200 × 10⁶ cells/m², and a biomass of 1600–3600 mg/m². As is shown, local inflow of “fresh” nutrients to the euphotic layer in the fall season leads to mass growth of diatoms.  相似文献   

Features of hydrophysical and hydrochemical conditions in Blagopoluchiya Bay (Novaya Zemlya Archipelago)     

S.?V.?StepanovaEmail author  A.?A.?Nedospasov 《Oceanology》2017,57(1):65-74

The report presents the results of hydrophysical and hydrochemical studies in Blagopoluchiya Bay (Novaya Zemlya Archipelago) based on data of integrated expeditions of the Institute of Oceanology in the Kara Sea in 2007, 2013, and 2014. The main focus was the influence of the Ob and Yenisei rivers, as well as of the runoff of meltwaters from the coasts of the archipelago on the hydrochemical and hydrophysical structures of the bay waters. The features of water exchange between the bay and adjacent aquatic area are considered, along with the renewal mechanisms for deep waters in the bay (deeper than 100 m). The possible occurrence of stagnant effects in deep layers of the bay is evaluated.  相似文献