Features of the Behavior of Organic Compounds in Water and Bottom Sediments in the Kara Sea during Seasonal Ice Melting     

Nemirovskaya  I. A.  Flint  M. V. 《Oceanology》2022,62(1):50-58

Oceanology - The article presents the first data on the content of organic compounds (OCs): Corg, lipids, and hydrocarbons (aliphatic—AHCs) and polycyclic aromatic (PAHs)) in suspended...  相似文献   

Seasonal Variability in the Sedimentary Matter Flux on the Shelf of the Northern Kara Sea     

Drits  A. V.  Kravchishina  M. D.  Sukhanova  I. N.  Belyaev  N. A.  Karmanov  V. A.  Flint  M. V. 《Oceanology》2021,61(6):984-993

Oceanology - Sedimentation rates in the northern Kara Sea between September 2019 and July 2020 were calculated from integrated monthly values for sedimentary matter, organic carbon, nitrogen, total...  相似文献   

Standing different ground: the spatial heterogeneity of territorial disputes     

Sang-Hyun Chi  Colin Flint 《GeoJournal》2013,78(3):553-573

Recent developments in spatial analysis and spatial data have allowed researchers to investigate various geographical factors in the quantitative analysis of conflict and war (Ward in Polit Geogr 21(2):155–158, 2002). Despite the importance of territory in interstate conflict, there has been a limited interest in the application of spatial analysis to the study of territorial conflict. Using geographically weighted regression (GWR) we evaluated the existing explanations of territorial conflict provided by a global scale analysis that assumes a spatial consistency in the explanatory variables. Specifically, we revisited Paul Huth’s foundational work by using GWR to examine the spatial pattern in the sign and significance of the variables. The result of GWR shows that the escalation of territorial conflict cannot be fully explained by one universal model. There is a high level of spatial variation in the regression parameters and the explanatory power of the model varies over space. A k-means cluster analysis was implemented for a further investigation of the regional pattern of the underlying causes of territorial disputes. The result of our GWR suggests the necessity and possibility to pursue a local or regional scale approach to the study of territorial conflict, an approach that challenges an epistemology of seeking a single explanation for the causes of conflict that neglects regional context. The spatial heterogeneity in the causes of territorial conflict escalation we find is framed within a narrative of the intertwined processes of colonialism, Cold War legacies, and competition for resources.  相似文献   

Phytoplankton of the surface desalted lens of the Kara Sea     

I. N. Sukhanova  M. V. Flint  V. M. Sergeeva 《Oceanology》2012,52(5):635-645

The phytoplankton of a surface strongly desalinated water lens was investigated on the basis of materials collected during the 57th cruise of the R/V Akademik Mstislav Keldish in September of 2007. The lens with a salinity of <18 psu had area of approximately 19 thousand square kilometers and was located in the northwestern part of the Kara Sea near the eastern coast of Novaya Zemlya. It was a specific biotope that had been isolated from the surrounding waters for more than three months. In the investigated area, 66 algae species were identified. The maximal species diversity was found in the upper layers of the desalinated lens, where the species number was 1.5 to 3 times higher than in other parts of the water column. The phytoplankton numbers in the upper layers of the lens were 1.5 to 4.5 times higher than in its lower part and generally higher than below the picnocline. Diatoms were the most abundant group in the upper layers of the lens, while flagellates dominated in numbers in the subpicnocline part of the water column. The maximal values of the phytoplankton biomass were observed everywhere in the upper layers of the lens, where they were 1.2 to 3.7 times higher than in the lower part of the lens and 1.3 to 7.2 times higher than in the layer below the picnocline. Dinoflagellates generally gave the most contribution to the total phytoplankton biomass. The phytoplankton of the desalinated surface lens in the northwestern part of the Kara Sea by its composition and quantitative parameters had the nearest resemblance to a phytocenosis that we observed two weeks later at a shallow desalinated shelf closely adjacent to the Ob estuary.  相似文献   

Numerical Estimations of Desalinated Seawater Modification Using Waters of the Laptev Sea Shelf as an Example     

Dubinina  E. O.  Miroshnikov  A. Yu.  Kossova  S. A.  Flint  M. V. 《Doklady Earth Sciences》2019,484(1):109-113

Doklady Earth Sciences - Continental runoff, inflowing to Arctic waters, is estimated by the use of isotope and hydrophysical tracers. This is quite a complicated task, because desalinated waters...  相似文献   

A sequence stratigraphic model for the Lower Coal Measures (Upper Carboniferous) of the Ruhr district, north-west Germany   总被引：3，自引：0，他引：3  

Gary Hampson  Harald Stollhofen  & Steve Flint 《Sedimentology》1999,46(6):1199-1231

Upper Carboniferous Coal Measures strata have been interpreted traditionally in terms of cyclothems bounded by marine flooding surfaces (marine bands) and coal seams. Correlation of such cyclothems in an extensive grid of closely spaced coal exploration boreholes provides a robust stratigraphic framework in which to study the Lower Coal Measures (Namurian C–Westphalian A) of the Ruhr district, north-west Germany. Three distinct types of cyclothem are recognized, based on their bounding surfaces and internal facies architecture. (1) Type 1 cyclothems are bounded by marine bands. Each cyclothem comprises a thick (30–80 m), regionally extensive, coarsening-upward delta front succession of interbedded shales, siltstones and sandstones, which may be deeply incised by a major fluvial sandstone complex. The delta front succession is capped by a thin (<1 m), regionally extensive coal seam and an overlying marine band defining the top of the cyclothem. (2) Type 2 cyclothems are bounded by thick (≈1 m), regionally extensive coal seams with few splits. The basal part of a typical cyclothem comprises a thick (15–50 m), widespread, coarsening-upward delta front or lake infill succession consisting of interbedded shales, siltstones and sandstones. Networks of major (>5 km wide, 20–40 m thick), steep-sided, multistorey fluvial sandstone complexes erode deeply into and, in some cases, through these successions and are overlain by the coal seam defining the cyclothem top. (3) Type 3 cyclothems are bounded by regionally extensive coal seam groups, characterized by numerous seam splits on a local (0·1–10 km) scale. Intervening strata vary in thickness (15–60 m) and are characterized by strong local facies variability. Root-penetrated, aggradational floodplain heteroliths pass laterally into single-storey fluvial channel-fill sandstones and coarsening-upward, shallow lake infill successions of interbedded shales, siltstones and sandstones over distances of several hundred metres to a few kilometres. Narrow (<2 km) but thick (20–50 m) multistorey fluvial sandstone complexes are rare, but occur in a few type 3 cyclothems. Several cyclothems are observed to change character from type 1 to type 2 and from type 2 to type 3 up the regional palaeoslope. Consequently, we envisage a model in which each cyclothem type represents a different palaeogeographic belt within the same, idealized delta system, subject to the same allogenic and autogenic controls on facies architecture. Type 1 cyclothems are dominated by deltaic shorelines deposited during a falling stage and lowstand of sea level. Type 2 cyclothems represent the coeval lower delta plain, which was deeply eroded by incised valleys that fed the falling stage and lowstand deltas. Type 3 cyclothems comprise mainly upper delta plain deposits in which the allogenic sea-level control was secondary to autogenic controls on facies architecture. The marine bands, widespread coals and coal seam groups that bound these three cyclothem types record abandonment of the delta system during periods of rapid sea-level rise. The model suggests that the extant cyclothem paradigm does not adequately describe the detailed facies architecture of Lower Coal Measures strata. Instead, these architectures may be better understood within a high-resolution stratigraphic framework incorporating sequence stratigraphic key surfaces, integrated with depositional models derived from analogous Pleistocene–Holocene fluvio-deltaic strata.  相似文献   

Structure of the phytoplankton communities and primary production in the Ob River estuary and over the adjacent Kara Sea shelf   总被引：1，自引：0，他引：1  

I. N. Sukhanova  M. V. Flint  S. A. Mosharov  V. M. Sergeeva 《Oceanology》2010,50(5):743-758

The material was collected in the Ob River estuary and over the adjacent shallow Kara Sea shelf between 71°14′0 and 75°33′0N at the end of September 2007. Latitudinal zoning in the phytoplankton distribution was demonstrated; this zoning was determined by the changes in the salinity and concentration of nutrients. Characteristic of the phytocenosis in the southern desalinated zone composed of freshwater species of diatom and green algae were the high population density (1.5 × 10⁶ cells/l), biomass (210 μgC/l), chlorophyll concentration (4.5 μg/l), and uniform distribution in the water column. High primary production (∼40 μgC/l/day) was recorded in the upper 1.5-m layer. The estuarine frontal zone located to the north contained a halocline at a depth of 3–5 m. Freshwater species with low population density (2.5 × 10⁵ cells/l), biomass (24 μgC/l), and chlorophyll concentration (1.5 μg/l) dominated above the halocline. Marine diatom algae, dinoflagellates, and autotrophic flagellates formed a considerable part of the phytocenosis below the halocline; the community characteristics were twofold lower as compared with the upper layer. The maximal values of the primary production (∼10 μgC/l per day) were recorded in the upper 1.5-m layer. The phytocenosis in the seaward zone was formed by marine alga species and was considerably poorer as compared with the frontal zone. The assimilation numbers at the end of the vegetation season in the overall studied area were low, amounting to 0.4–1.0 μgC/μgChl/h in the upper layer and 0.03–0.1 μgC/μgChl/h under the pycnocline.  相似文献   

Structure of the zooplankton communities in the region of the Ob River’s estuarine frontal zone     

M. V. Flint  T. N. Semenova  E. G. Arashkevich  I. N. Sukhanova  V. I. Gagarin  V. V. Kremenetskiy  M. A. Pivovarov  K. A. Soloviev 《Oceanology》2010,50(5):766-779

The studies were carried out on September 27–30, 2007, in the area of the Ob estuarine frontal zone and over the adjacent inner Kara Sea shelf. Based upon the latitudinal changes in the salinity, the 100 nautical mile wide estuarine frontal zone was marked out. The frontal zone was inhabited by a specific zooplankton community dominated by species that occurred outside the frontal zone in only minor amounts. The biomass of the mesozooplankton averaging 984 mg/m³ in the frontal zone exceeded by 1.5 and 6 times the corresponding values in the inner desalinated area of the estuary and the adjacent areas of the Kara Sea shelf. At the inner southern periphery of the frontal zone, at maximal latitudinal salinity gradients (>2 psu per mile), the maximal development of the mesoplankton with the mean biomass for the water column of 3.1 g/m³ (37 g/m²) and up to 5.8 g/m³ in the subpycnocline layer was observed. The latitudinal extension of the biomass in the maximum zone did not exceed 10 miles. More than 90% of the maximum was composed of herbivorous zooplankton with the strong domination of the copepod Limnocalanus macrurus. The daily consumption within the zooplankton maximum area was estimated at 820 mgC/m² per day. This value exceeds by two orders of magnitude the local primary production. At that level of consumption, the available phytoplankton biomass was consumed by grazers in less than 8 hours (!). A zooplankton aggregation at the southern periphery of the estuarine front exists due to the advection of phytoplankton from the adjacent river zone. The aggregation forms a natural pelagic biofilter where new allochthonous organic matter delivered by the river flow is accumulated and high secondary production is formed on its basis. An anomalously high concentration of planktic predatory Parasagitta elegans with biomass of over 1 g/m³ (46% of the total zooplankton biomass) was associated with the outer northern periphery of the estuarine frontal zone.  相似文献   

Ecosystems of the Siberian Arctic Seas 2018 (Cruise 72 of the R/V Akademik Mstislav Keldysh)     

Flint  M. V.  Poyarkov  S. G.  Rimskii-Korsakov  N. A.  Miroshnikov  A. Yu. 《Oceanology》2019,59(3):460-463

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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