共查询到20条相似文献，搜索用时 406 毫秒
1.
V. A. Ivanov S. P. Lyubartseva É. N. Mikhailova N. B. Shapiro I. Gertman 《Physical Oceanography》2002,12(5):237-256
Within the framework of the integral model in isopycnic coordinates including the upper mixed layer, we study the rearrangement of temperature and salinity fields in the Dead Sea. It is forced by the variability of atmospheric factors and mass fluxes through the lateral boundaries of the basin, which are connected with the freshwater run-off to the sea and the outflow from the sea to the shallow south bay, where evaporator installations for salt extraction are located. Such factors as solar radiation, wind velocity, air temperature, and relative humidity are prescribed. Evaporation is calculated with the use of a bulk formula, whereas precipitation intensity and discharge through the lateral boundaries are determined as functions of the sea level obtained from observations. This model reflects the specific character of the Dead Sea and takes into account the effect of water salinity on its evaporation, salt concretion, and mechanical evaporation. Comparison with the data of observations shows that the proposed model fairly precisely describes the observed specific features of the thermohaline water structure in the meromictic (1992–1996) and holomictic (1996–2000) periods. 相似文献
2.
Distribution of Pacific-origin water in the region of the Chukchi Plateau in the Arctic Ocean in the summer of 2003 总被引：6，自引：1，他引：6
1Introduction Besidestheprecipitationandriverdischarges,the watersinthePacificOceanandtheAtlanticOceanare thesourcesoftheArcticOceanwater.TheAtlantic waterenterstheArcticOceanviatheFramStraitand theBarentsSea.Foritsdenserfeatureduetohigh salinity,mostofitsinkstothenorthofSvaldbardand circulatesinallthedeepbasinsintheArcticOcean, formingthedeepandbottomwatersoftheArcticO- cean(Aagaardetal.,1985;Rudelsetal.,1999).The BeringStraitistheonlychannelforthePacificwater toflowintotheArcticOce… 相似文献
3.
-Six cruises were carried out off the south bank of Fujian - Taiwan during the period of December 21, 1987 to November 15, 1988 to estimate the contribution of bacterial biomass carbon (BBC) to the totai particulate organic pools using epifluorescent microscopic technique. The results show that the standing crop of bacteria fluctuated from 0. 95 to 66. 60 mg /m3 (dry weight). Upwelling phenomena appeared in the region around Nanpeng Island in summer while in the region of Waixie in all seasons. The average value of BBC was 27. 60(±6. 08)mg/m3and 21. 32 (±2. 34) mg/m3 respectively. The seasonal and spatial distribution is discussed in relation to environmental factors as well as upwelling phenomena. The role of bacteria in the flow of material and energy in the upwelling ecosystem is emphasized. 相似文献
4.
Zinc exchange isotherms in mixtures of hydrous metal oxides and clay minerals have been reported. The relationship between the isotherms of the mixtures and the isotherms of their components is studied. The isotherms of the mixtures are stepwise. And the formation constants for the zinc exchange in the mixtures are calculated. The results show that the stepwise equilibrium formation constants and the saturation exchange capacities for the zinc exchange in kaolinite/ mon-tmorrillonite, amorphous iron oxide/montmorrillonite and γ-AlOOH/montmorrillonite mixtures are equal in weight to those of their components. The interactions between fresh iron oxyhydroxide and δ-MnOz reduce the metal binding sites of the mixtures, while the stepwise equilibrium constants are not affected by the interactions. 相似文献
5.
《中国海洋大学学报(自然科学版)》1986,(4)
Haliphthoros philippinensis, a marine mastigomycete isolated from larvae of the jumbo tiger prawn Penaeus monodon, is described and illustrated as new. The fungus grew at a temperature range of 13.5 to 36.3℃, with the optimum of 29.3-34.5℃. Its growth occurred in peptone-yeast extract-glucose ( PYG ) broth containing 0.3-7% NaCl, with the optimum concentrations of 1 to 4%. At 8% or more NaCl concentrations, the growth was not observed. Its pH range for growth was 5 to 11. 相似文献
6.
S. N. Moshonkin G. V. Alekseev N. A. Dianskii A. V. Gusev V. B. Zalesny 《Izvestiya Atmospheric and Oceanic Physics》2011,47(5):628-641
Calculations were performed using a model of the combined circulation of the Atlantic Ocean (from 20° S), the Arctic Ocean, and the Bering Sea with a resolution of 0.25° by latitude and longitude for 1958–2006. The results are compared with observational data and results obtained by other models. Model estimates were obtained for the evolution of the Atlantic water inflow into the Arctic basin through the Fram Strait and the Barents Sea. Increased transports of Atlantic water inflow into the Arctic basin were found for the first half of the 1990s and 2004–2006. The relation between Atlantic water transports into the Arctic basin and variations in the North Atlantic oscillation is shown. A positive trend of Atlantic water inflow into the Arctic basin through the Fram Strait (0.061 Sv per year) was revealed. The evolution of the freshwater-layer thickness in the Beaufort Circulation (BC) is considered. There are three periods of its increased values combined with the increased anticyclonic vorticity of BC currents: the 1960s, the 1980s, and from 1999 until now. The model estimate for a statistical mean timescale of the cycle of freshwater concentration and sink from the BC is 16 years, which is close to currently existing estimates. The evolution of anticyclonic vorticity of currents leads the variations in the freshwater-layer thickness of the BC by 1.75 years. Since the mid-1970s, there have been long positive trends of both the freshwater-layer thickness and anticyclonic vorticity of currents in the BC. In the same time period, there has been a satellite-registered negative trend in the ice area in the Arctic, which was reproduced by the model. 相似文献
7.
The study was made by observing the annual change of the gonadal development of amphioxus in Xiamen cohtinuously for two years from November, 1986 to November, 1988. We determined the gonadal diameter, gonadosomatic index of each amphioxus, and observed the histological characteristic of the gonadal development of the female and male by cut section, which provided the basis for dividing the stages gonads and the determining level of the gonadal development of amphioxus in each month. 相似文献
8.
《中国海洋大学学报(自然科学版)》1986,(4)
Lagenidium scyllae a marine mastigomycete from ova and larvae of the mangrove crab, is described and illustrated as new. The fungus grew at a temperature range of 16 to 42℃, with the optimum of 22.5-31.8℃. It grew well in peptone-veast-glucose ( PYG ) broth containing 2-3% NaCl, although did through a range of NaCl contents between O and 7%.At 8% NaCl or above the growth failed to occur in the medium.In PYG-sea water medium, it grew at a pH range of 5 to 11. 相似文献
9.
A. V. Polyakov Yu. M. Timofeyev Ya. A. Virolainen M. V. Makarova A. V. Poberovskii H. K. Imhasin 《Izvestiya Atmospheric and Oceanic Physics》2018,54(5):487-494
The results of the first long-term (2009–2017) ground-based spectroscopic measurements of the total content (TC) of a number of freons in Russia are presented. According to measurements in Peterhof, TCs of CFC-11 and CFC-12 decrease at a rate of ~0.6% per year and TC of HCFC-22 grows at a rate of ~2.7% per year, which is in good agreement with independent measurements. The seasonal course of freon TC in the area of St. Petersburg is registered: highs of CFC-11 and CFC-12 are observed in summer and lows are in late winter and spring. For the HCFC-22 TC, the opposite seasonal course is observed, with a maximum in winter and a minimum in summer. 相似文献
10.
11.
The materials were obtained from the survey conducted in the Kuroshio area of the East China Sea to the Southwest of Kyushu in Japan (29°30'-32°00', 128°00'-130°'00'E) on board the R. V. Yoko Maru of Seikai Regional Fisheries Lab, Fisheries Agency, Japan in June 15~28, 1988 during China-Japan Joint Research on the Kuroshio. Zoo-plankton was collected by means of the North Pacific Net with model TSK flowmeter through vertical haul from 50 -Om. Temperature and salinity were measured with CTD. 134 species (including 4 spp. ) of planktonic copepods were preliminarily identified in the survey area. Most of them belonged to the tropical and subtropical species and a few of them were the warm-temperate species and eurytopic species. The main dominant species vteieOncaea venusta, Oithona plumifera, Clausocalanus furcatus, C. Arcuicornis, Paracaianus dculeatus, Oithona similis, Temara turbinata, Oncaea media, Undinula danvinii, Acartia negligent, Corycaeus speciosus, Scolecithrix danae, etc. The total number 相似文献
12.
A. I. Ryabinin Yu. A. Mal’chenko L. V. Saltykova E. A. Danilova S. A. Bobrova 《Physical Oceanography》2011,21(2):115-128
We study the space-and-time variability of the concentrations of 27 microelements (Sc, Cr, Mn, Fe, Ni, Co, Cu, Zn, As, Mo,
Ag, Cd, Sn, Se, Sb, Ba, La, Ce, Sm, Eu, Tb, Hf, Hg, Pb, Au, Th, and U) and Sr in the sea, river, and waste waters of the South
Coast of Crimea in 2002–2007. Parallel with the data about elements studied earlier, we present, for the first time, the data
of investigations of the contents of rareearth elements (Lu, Nd and Yb) whose concentrations in the major part of the analyzed
samples of seawater were lower than the limit of their quantitative determination. We present the ranges of the concentrations
of elements and perform their comparison with the data of the previous period of monitoring. 相似文献
13.
14.
ZhongBian KishioHatait GiklaL.po SyuzoEgusa 《山东海洋学院学报》1986,16(4):210-210
Lagenidium scyllae a marine mastigomycete from ova and larvae of the mangrove crab, is described and illustrated as new. The fungus grew at a temperature range of 16 to 42℃, with the optimum of 22.5—31.8℃. It grew well in peptone-veast-glucose(PYG) broth containing 2—3%NaCl. 相似文献
15.
Preliminary study of the retention mechanism of planktonic copepods in the Jiulong Estuary in China 总被引：1，自引：0，他引：1
The horizontal and vertical distribution patterns of five planktonic copepods,Calanus sinicus, Acartia pacifica, Tortanus derjugini, Acartiella sinensis and Pseudodiaptomus poplesia, predominant in the Jiulong Estuary, were investigated from May 2003 to April 2004. The results showed that the distribution of these copepods was related to the tidal period but that each species had its own specific pattern. C. sinicus showed no tidal vertical migration behavior and was thought to be a non-resident species in this estuary. Among Acartia pacifica,T. derjugini,Acartiella sinensis, more individuals occurred in the surface than in the bottom waters during flood tide, and the pattern was reversed during ebb tide. The epibenthic copepod P. poplesia usually remained in the bottom waters in the upstream part of the estuary, but it displayed strong tidally-oriented vertical migration in the middle reaches of the estuary.Taking into account the hydrographic characteristics of the Jiulong Estuary,it was hypothesized that the planktonic copepods in this estuary had more or less adopted the mechanism of vertically migrating to the surface waters during flood tide in order to make use of the inflowing tide, and then sinking to the bottom during ebb tide to avoid being carried out of the estuary by net outflow. 相似文献
16.
S. G. Demyshev 《Physical Oceanography》2010,20(3):184-195
Within the framework of the Mellor–Yamada approach, we realize a numerical scheme for the calculation of the coefficients
of turbulent viscosity and diffusion in the z -system of coordinates for the three-dimensional model of operative prediction of currents in the Black Sea. Some discrete
analogs of the equations for turbulent kinetic energy and turbulence macroscale are studied. Their high sensitivity to the
choice of finite-difference approximations is demonstrated. On the basis of the comparison of the results of prognostic experiments
with the data of observations, we choose the best approximation of the term used to describe the generation pf turbulence
energy. 相似文献
17.
The Pelotas Basin is the classical example of a volcanic passive margin displaying large wedges of seaward-dipping reflectors (SDR). The SDR fill entirely its rifts throughout the basin, characterizing the abundant syn-rift magmatism (133–113 Ma). The Paraná–Etendeka Large Igneous Province (LIP), adjacent to west, constituted the pre-rift magmatism (134–132 Ma). The interpretation of ultra-deep seismic lines showed a very different geology from the adjacent Santos, Campos and Espírito Santo Basins, which constitute examples of magma-poor passive margins. Besides displaying rifts totally filled by volcanic rocks, diverse continental crustal domains were defined in the Pelotas Basin, such as an outer domain, probably constituted by highly stretched and permeated continental igneous crust, and a highly reflective lower crust probably reflecting underplating.The analysis of rifting in this portion of the South Atlantic is based on seismic interpretation and on the distribution of regional linear magnetic anomalies. The lateral accretion of SDR to the east towards the future site of the breakup and the temporal relationship between their rift and sag geometries allows the reconstitution of the evolution of rifting in the basin. Breakup propagated from south to north in three stages (130–127.5; 127.5–125; 125–113 Ma) physically separated by oceanic fracture zones (FZ). The width of the stretched, thinned and heavily intruded continental crust also showed a three-stage increase in the same direction and at the same FZ. Consequently, the Continental-Oceanic Boundary (COB) shows three marked shifts, from west to east, from south to north, resulting into rift to margin segmentation. Rifting also propagated from west to east, in the direction of the final breakup, in each of the three segments defined. The importance of the Paraná–Etendeka LIP upon the overall history of rupturing and breakup of Western Gondwanaland seems to have been restricted in time and in space only to the Pelotas Basin. 相似文献
18.
S. I. Kondrat’ev 《Physical Oceanography》2010,20(2):136-148
We discuss the influence of hydrophysical and biological-chemical processes on the distribution of dissolved oxygen in waters
of the Sevastopol bay in various seasons. In the winter period, against the background of low rates of biological-chemical
processes, the hydrophysical processes provide the homogeneous distributions of temperature and oxygen. In summer, the hydrophysical
processes remain dominant, but the influence of biological-chemical processes becomes noticeable. In the autumn period, the
vertical distribution of oxygen is strongly affected by biological-chemical processes. 相似文献
19.
-Exchange additivity of binary mixtures of hydrous metal oxides and clay minerals has been studied by investigating the relations of the zinc exchange-pH and the zinc partition coefficients to mixtures. The additive exchange equation is proposed to describe the exchange-pH relationship. The results suggest that zinc exchanges on the components in amorphous iron oxide/montmorrillonite, kaolinite/montmorrillonite, γ-A100H/montmorrillonite, amorphous iron oxide/illite mixtures are additive. But the exchange ofδ-MnO2/montmorrillonite is much less than its additive exchange. It is also shown that in the case of additive exchange the exchange parameters (Kmix{SOH}Tmix) of the mixtures are equal in weight to the sum of those of each component of the solid mixtures. 相似文献
20.
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