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21.
In 1993 and 2007 when the expeditions of the Shirshov Institute of Oceanology were performed in the Kara Sea, a significant
part of its aquatic area was occupied by lenses of desalinated water. The fresh-water is supplied by the runoff of the Ob
and Yenisei rivers, as well as by meltwaters. The report considers the features of the freshwater chemical transformation
in the sea. It is shown that the contribution of meltwaters is small in the highly desalinated lenses (with salinity below
15‰) and the freshwater is supplied by the riverine runoff. It is also shown that, under definite conditions, it is possible
to determine the relative shares of the Ob and Yenisei waters using the chemical parameters (the silicon and alkalinity).
The data of 1993 when two lenses as such were found in the sea were confirmed; at that, the waters of the Yenisei and Ob rivers
were prevailing in the western and northeastern lenses, respectively. In 2007, one lens was found in the treated area of the
sea. It is shown that the chemical characteristics of the freshwater in the lens appeared to be sufficiently different from
those of the Ob river but similar to the Yenisei river’s characteristics according to the data of 1993. A map of the Ob’s
and the Yenisei’s water spreading over the sea’s aquatic area is presented. 相似文献
22.
A. K. Ambrosimov D. A. Ambrosimov P. N. Makkaveev Yu. R. Nalbandov L. E. Skibinskii P. V. Hlebopashev 《Oceanology》2009,49(5):630-642
Characteristics of different types of river drainage were obtained during studies of a polygon in the near-mouth part of the
Volga River in 2000–2003: “fast” (flowing through deep channels) and “slow” (that which passes through the littoral parts
of the delta (1–2 m)). The low current velocities (lower than in the channel waters by a factor of ten), the abundance of
water vegetation, and the strong heating of the waters lead to the high intensity of the biochemical processes. Therefore,
the chemical composition of the waters is subjected to significant transformation with intensity so high that it allows comparing
these regions with some sort of “bioreactor.” These changes influence the dissolved oxygen and various forms of carbon content. 相似文献
23.
K. V. Artamonova S. A. Lapin O. N. Luk’yanova P. N. Makkaveev A. A. Polukhin 《Oceanology》2013,53(3):317-326
The hydrochemical features of Ob Inlet in the open-water time were characterized using the data of the surveys during two seasons of different water content. The inlet was subdivided into the “riverine,” “marine,” and intermediate areas being different in the factors determining their hydrochemical regime. The processes occurring in each of the distinguished areas were considered in detail. Special attention was paid to the hydrochemical features in the mixing area of the fresh and saline waters (the frontal zone) within the periods of the maximum and minimum biological activity in the aquatic area of Ob Inlet. 相似文献
24.
Resulting from the surveys in the Blagopoluchiya and Techenii bays at the Novaya Zemlya Archipelago during cruise 54 of the R/V Akademik Mstislav Keldysh in September of 2007, it was shown that the waters supplied from the archipelago coasts contained considerable amounts of dissolved nitrogen and phosphorus. The pH values and total alkalinities were also considerably increased. The laboratory experiments confirmed that the rocks forming the coasts of the surveyed bays might be sources of nitrogen and phosphorus. The effect of the Novaya Zemlya runoff upon the hydrochemical structure of the upper 10-m layer of the seawaters was traced for 16–20 km from the coast during the period of the surveys. 相似文献
25.
26.
Oceanology - It is believed that the waters of rivers flowing into the Kara Sea (predominantly discharge of the Yenisei and Ob rivers) can propagate to the east, penetrating the Laptev Sea with the... 相似文献
27.
P. N. Makkaveev P. A. Stunzhas Z. G. Mel’nikova P. V. Khlebopashev Sh. Kh. Yakubov 《Oceanology》2010,50(5):688-697
Hydrochemical studies of the Kara Sea were included into the program of the integrated expedition during cruise 54 of the
R/V Akademik Mstislav Keldysh (September 9–30, 2007). In several sea areas quite different in their weather conditions, a large set of hydrochemical analyses
was carried out, including the determination of the primary nutrients (silicon and different forms of nitrogen and phosphorus),
the dissolved oxygen content, and the total alkalinity and pH values. The report presents the hydrochemical conditions in
the southwestern part of the Kara Sea and the most striking results from the authors’ viewpoint. The data were compared to
those of the integrated oceanographic expedition of cruise 49 of the R/V Dmitry Mendeleev in 1993. 相似文献
28.
Demidov A. B. Gagarin V. I. Artemiev V. A. Arashkevich E. G. Makkaveev P. N. Shchuka S. A. Khrapko A. N. Grigoriev A. V. Vorobieva O. V. Konyukhov I. V. Fedorov A. V. 《Oceanology》2020,60(2):189-204
Oceanology - The vertical distribution of phytoplankton primary production (PP) and chlorophyll a (Chl) was studied based on the data carried out in August–September 2015, 2017, and 2018. The... 相似文献
29.
P. N. Makkaveev 《Oceanology》2009,49(4):466-472
Abnormally high pH values (up to 9 NBS units and over) were registered by different expeditions at the seaward edge of the
Volga River delta. Within the report, the relationship of the pH values, the dissolved oxygen content, and the water temperature
are considered using the equations of the thermodynamic theory of carbonate equilibrium. It is shown that the changes of the
pH values are nonlinear relative to the content of oxygen. The nonlinearity is most pronounced at high values of the water
saturation with oxygen (over 110–120%). A pH value over 9 may be reached in well heated waters at a dissolved oxygen content
of 8–9 ml/l. The oxygen content as such is of course high but not excessive and might be caused by the high intensity of the
production processes in the waters. 相似文献
30.
Sukhanova I. N. Flint M. V. Fedodov A. V. Sakharova E. G. Makkaveev P. N. Polukhin A. A. Nedospasov A. A. Schuka A. S. 《Oceanology》2021,61(6):909-929
Oceanology - Research on the structure of phytoplankton communities of the East Siberian Sea has been carried out during the 69th cruise of the research vessel Akademik Mstislav Keldysh within the... 相似文献