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91.
Rimsky-Korsakov N. A. Flint M. V. Pojarkov S. G. Anisimov I. M. Belevitnev Y. I. Pronin A. A. Tronza S. N. 《Oceanology》2019,59(4):612-615
Oceanology - Abstract—The article touches upon methodological problems of studying the underwater fauna, plant, and micro- and mesorelief of the near-bottom zone of the Russian Arctic seas in... 相似文献
92.
Oceanology - The spatial distribution of picophytoplankton abundance, biomass, chlorophyll a and the contribution of picoalgae to the total chlorophyll a was studied in the outer Ob River estuary... 相似文献
93.
Drits A. V. Pasternak A. F. Kravchishina M. D. Arashkevich E. G. Sukhanova I. N. Flint M. V. 《Oceanology》2019,59(5):669-677
Oceanology - The role of plankton in the vertical flux in the East Siberian Sea was studied in the 69 cruise of the RV “Akademik Mstislav Keldysh” in September 2017. Vertical fluxes... 相似文献
94.
Oceanology - Studies of zooplankton spatial distribution and feeding were conducted in the eastern part of the Barents Sea in early October 2014. The study period was characterized by positive... 相似文献
95.
Oceanology - The research program of the dynamics and ecosystem of the Drake Passage and Scotia Sea is scientifically substantiated. Measurements will be carried out by the interdepartmental... 相似文献
96.
97.
I.?I.?Rusanov A.?Yu.?LeinEmail author P.?N.?Makkaveev A.?A.?Klyuvitkin M.?D.?Kravchishina M.?V.?Ivanov M.?V.?Flint 《Oceanology》2018,58(1):57-70
Integrated studies on the hydrochemistry and water column rates of microbial processes in the eastern sector of the Black Sea along a standard 100-miles transect off Gelendzhik from the coast to the central part of the sea at water depths of 100–2170 m show that a series of warm winters and the absence of intense convective winter mixing resulted in a relatively low content of suspended particulate matter (SPM), particulate organic carbon (POC), and nutrients in the water column in March 2009. The relatively high SPM concentrations and the presence of isotopically light POC at the offshore station are indicative of the supply of terrigenous material from land and low contributions of phytoplanktonic organic matter to the composition of SPM. This may explain the low rates of biogeochemical processes in the water column near the coast. The surface layer at deep-water stations is dominated by isotopically heavy phytoplanktonic organic matter. This suggests that the supply of terrigenous material from land was insufficient in offshore deep-water areas. Therefore, warm winters and insufficient nutrient supply do not prevent photosynthesis in the photic layer of the deep-water zone, which generates organic substrates for heterotrophic aquatic communities. The results of isotopic analysis of POC, measurements of the rates biogeochemical processes, and the hydrochemical characteristics of the water column can be used to determine the nature and seasonal variability of the POC composition. 相似文献
98.
99.
Within the framework of the quasi-geostrophic approximation, the interactions of two identical initially circular vortex patches are studied using the contour dynamics/surgery method. The cases of barotropic vortices and of vortices in the upper layer of a two-layer fluid are considered. Diagrams showing the end states of vortex interactions and, in particular, the new regime of vortex triplet formation are constructed for a wide range of external parameters. This paper shows that, in the nonlinear evolution of two such (like-signed) vortices, the filaments and vorticity fragments surrounding the merged vortex often collapse into satellite vortices. Therefore, the conditions for the formation and the quasi-steady motions of a new type of triplet-shaped vortex structure are obtained. 相似文献
100.
Toby J. Boocock Sami Mikhail Julie Prytulak Tommaso Di Rocco Eva E. Stüeken 《Geostandards and Geoanalytical Research》2020,44(3):537-551
Thirteen commercially available silicate reference materials (RM) and one in‐house reference material, eleven of which have no previously published values, were analysed for nitrogen mass fraction and isotopic ratios with an Elemental Analyser (EA), and a Sealed Tube Combustion line, coupled to a continuous flow isotope ratio mass spectrometer (IRMS). These materials ranged from < 10 μg g?1 to 1% m/m nitrogen mass fractions and δ15N of ?0.5 to +19.8‰. Existing nitrogen RM BHVO‐2, MS#5 and SGR‐1b were used to assess the accuracy of the data from the sealed tube combustion line, which was found to be in good agreement with existing published values. In contrast, the EA‐IRMS failed to fully liberate nitrogen from all silicate rocks and minerals (achieving a mean of 44 ± 10% nitrogen yield) resulting in kinetic fractionation of isotope values by ?1.4‰ on average. Therefore, sealed tube combustion is better suited for analyses of silicate‐bound nitrogen. The EA worked reliably for organic samples, but care should be taken when using the EA for silicate nitrogen research. Moving forward, it is recommended that BHVO‐2, Biotite‐Fe, FK‐N and UB‐N be used as quality control materials as they appear to be most reproducible in terms of nitrogen mass fraction (relative error < 10%, 1s), and isotopic composition (< 0.6‰, 1s). 相似文献