Gas Distribution Features in the Upper Layer of Marine Sediments in the Continental Shelf of the Laptev Sea–Arctic Ocean Profile     

Sevastyanov  V. S.  Fedulova  V. Yu.  Stennikov  A. V.  Kuznetsova  O. V.  Naimushin  S. G.  Dushenko  N. V.  Krivenko  A. P. 《Oceanology》2021,61(4):472-487

Oceanology - Hydrocarbon gases (CH4, C2H4, C2H6, C3H6, C3H8, C4H8, n-C4H10, iC4H10, nC5H12, iC5H12, neo-C5H12), CO2, H2S, CH3SCH3, and COS were obtained from various marine sediment horizons at a...  相似文献   

Basic regularities of the formation of “new” and regeneration production in the Black Sea     

O. V. Krivenko 《Physical Oceanography》2006,16(6):337-349

Based on the experimental data obtained in 1990–1993 by the method of isotopic tracers with the help of a stable isotope of nitrogen (¹⁵N), we establish basic regularities of the formation of “new” and regeneration production in the Black Sea and reveal the factors specifying their combination. It is shown that the rates of nitrate and ammonium uptake by microplankton vary from the minimum values in winter to the maximum values in summer. In the surface layer, the uptake of nitrates corresponding to the amount of “new” production in deep-water layers is equal to ∼ 50% (in winter) and ∼ 30% (in summer) of the total uptake of inorganic nitrogen compounds by microplankton. In the zone of photosynthesis, the average fractions of nitrates are equal to 31 ± 10% in winter and 41 ± 10% in summer. The minimum values of this parameter are attained in the middle of spring and in autumn. The fraction of “new” production (f-ratio) and the integral content of nitrates in the zone of photosynthesis are connected by a hyperbolic dependence. The period of cyclic transformations of nitrates in this zone decreases from several dozens of days at the beginning of winter to 12 h in the mid-spring. In summer, this period is equal, on the average, to one day. The average period of cyclic transformations of ammonium is equal to 15 ± 4 h in winter and 5 ± 3 h in summer. __________ Translated from Morskoi Gidrofizicheskii Zhurnal, No. 6, pp. 29–43, November–December, 2006.  相似文献   

On the second integrals of geodesics in the Kerr field     

O. P. Krivenko  K. A. Pyragas  I. T. Zhuk 《Astrophysics and Space Science》1976,40(1):39-61

Qualitative analysis is given of the second integrals of the equations of geodesics of the Kerr metric expressed in the Boyer-Lindquist coordinates.  相似文献