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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
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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.
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Translated from Morskoi Gidrofizicheskii Zhurnal, No. 6, pp. 29–43, November–December, 2006. 相似文献
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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
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