Ermittlung der QNH-werte aus dem luftdruckfeld der synoptischen bodenkarte     

Antonín Papež 《Studia Geophysica et Geodaetica》1964,8(2):200-204

Резюме Дабление воздуха, переснитанное иа уровень моря по стандартной атмосфере в Q-коде обозчачается через QNH. Давление воздуха пересчитанное на уровень моря по высотной барометрической формуле обознаеается через QFF. Для целей авиационной службы погоды должны быть известны значения QNH, однако Зе барическое поле на синоптических картах выражается через QFF. С помощью рис. 1 для соответствующей температуры воздуха на станцин и ее высоты н. у. м. можно определить разность значений QFF—QNH при давленин QFF=1000мб. Далее по табл. 2 можно определить поправку для каждого значения QFF отличного от значения QFF при ином давлении, чем 1000мб путем умножения табулированного значения ва разность QFF—1000мб и его алгебраического сложения со значением, полученным по рис. 1.   相似文献   

Space triangulation in the western part of the High Tatras     

Ludvík Hradilek 《Studia Geophysica et Geodaetica》1963,7(4):330-335

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A simple theoretical interpretation of the cloud system in a dying cyclone from the aspect of the boucher-newcomb model     

Pavla Hlachová  Vojtěch Vítek 《Studia Geophysica et Geodaetica》1966,10(4):481-483

Резюме С помощью принятия простых кинематических предположений и на основании ω—уравнения выла определена конфигурация полос облаков в полностью окклюдированном циклоне без фронтов. Облачная система определяется полем скрытой теплоты, выделяемой в процессах конденсации. Полосы облаков теоретически представляют собой в основном листы синусоидальной спирали.

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Address: Boční II, Praha 4-Spořilov.  相似文献   

The system water-glycerol-gelatine as a medium for three-dimensional seismic models     

Ludvík Waniek 《Studia Geophysica et Geodaetica》1966,10(3):273-279

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Simulating a heavy metal spill under estuarine conditions: Effects on the clam Scrobicularia plana     

E. García-Luque  T. A. DelValls  C. Casado-Martínez  J. M. Forja  A. Gmez-Parra 《Marine environmental research》2004,58(2-5):671

We describe the effect of heavy metals Zn, Cd, Pb and Cu on the induction of methallothioneins on the clam Scrobicularia plana along a salinity gradient simulated under laboratory conditions. The clams were exposed to constant heavy metal concentrations in a dynamic estuary simulator during a 15-day assay to investigate possible induction of metal-binding proteins in them. The concentration of heavy metals in water was analysed. Clams were analysed for methallothionein concentrations. The speciation of Zn, Cd, Pb and Cu along the salinity gradient was modelled. Zn showed the highest concentrations and its prevalent species was the free ion. Intersite differences have been observed in methallothionein concentration and related to the salinity gradient. It seems that synthesis of methallothioneins is the result of physiological forces acting in concert with the changes in the chemical speciation of metals, owing to the trace metals uptake is controlled by means of an interaction of physiology and physicochemistry.  相似文献   

First results from the North Iceland experiment     

C. Riedel  A. Tryggvason  B. Brandsdottír  T. Dahm  R. Stéfansson  M. Hensch  R. Böðvarsson  K. S. Vogfjord  S. Jakobsdottír  T. Eken  R. Herber  J. Holmjarn  M. Schnese  M. Thölen  B. Hofmann  B. Sigurdsson  S. Winter 《Marine Geophysical Researches》2006,27(4):267-281

Between June 2004 and September 2004 a temporary seismic network was installed on the northern insular shelf of Iceland and onshore in north Iceland. The seismic setup aimed at resolving the subsurface structure and, thus, the geodynamical transition from Icelandic crust to typical oceanic crust along Kolbeinsey Ridge. The experiment recorded about 1,000 earthquakes. The region encloses the Tjörnes Fracture Zone containing the Husavik–Flatey strike-slip fault and the extensional seismic Grimsey Lineament. Most of the seismicity occurs in swarms offshore. Preliminary results reveal typical mid-ocean crust north of Grimsey and a heterogeneous structure with major velocity anomalies along the seismic lineaments and north–south trending subsurface features. Complementary bathymetric mapping highlight numerous extrusion features along the Grimsey Lineament and Kolbeinsey Ridge. The seismic dataset promises to deliver new insights into the tectonic framework for earthquakes in an extensional transform zone along the global mid-ocean ridge system.  相似文献   

Cd, Pb, Cu, Ni and Co distribution in the German Bight     

L. Mart  H.W. Nürnberg   《Marine Chemistry》1986,18(2-4)

Cd, Pb and Cu concentrations, dissolved and total, have been determined in the German Bight. In 1975, 1977, 1978, 1980 and 1983 water samples were collected at 215 sampling stations. In the 1983 mission samples were also analysed for Ni and Co. The samples were filtered and acidified immediately after collection. Analysis was performed by voltammetry.The analytical data indicate that a net portion of the Cd, the Weser being a distinct source for it, will cross the estuarine zone. Open sea Cd levels in the German Bight are about a factor 10 higher than North Atlantic values. Pb, being transported mainly with the suspended particulate phase (up to 99.5%), is better eliminated by sedimentation in the estuaries. Ni and Cu occur mainly in the dissolved phase. Pollution by Co is distinct in the Elbe, but the output is rapidly diluted to background contents below 10 ng kg⁻¹. An interpretation of the results from the different years yields a rather steady state situation in the German Bight.  相似文献   

The Levant Slumps and the Phoenician Structures: collapse features along the continental margin of the southeastern Mediterranean Sea     

Yossi Mart  William Ryan 《Marine Geophysical Researches》2007,28(4):297-307

Two distinct series of slumps deform the upper part of the sedimentary sequence along the continental margin of the Levant. One series is found along the base of the continental slope, where it overlies the disrupted eastern edge of the Messinian evaporites. The second series of slumps transects the continental margin from the shelf break to the Levant Basin. It seemed that the two series were triggered by two unrelated, though contemporaneous, processes. The shore-parallel slumps were initiated by basinwards flow of the Messinian salt, that carried along the overlying Plio-Quaternary sediments. Seawater that percolated along the detachment faults dissolved the underlying salt to form distinctly disrupted structures. The slope-normal slumps are located on top of large canyons that cut into the pre-Messinian sedimentary rocks. A layer of salt is found in the canyons, and the Plio-Quaternary sediments were deposited on that layer. The slumps are bounded by large, NW-trending faults where post-Messinian faulted offset was measured. We presume that the flow of the salt in the canyons also drives the slope-normal slumps. Thus thin-skinned halokynetic processes generated the composite post-Tortonian structural patterns of the Levant margin. The Phoenician Structures are a prime example of the collapse of a distal continental margin due to the dissolution of a massive salt layer.  相似文献   

Faults at the proximal continental shelf off Atlit,central Israel,and their neotectonic significance     

Yossi Mart 《Geo-Marine Letters》1996,16(2):41-48

A seismic reflection survey was conducted in the proximal shelf off Atlit, western Mt. Carmel, Israel, to clarify the regional neotectonic regime. The Atlit promontory is built of late Pleistocene eolianite ridge, truncated by faults at its northern extension. The seismic survey encountered two series of faults, trending N—S and NW—SE, offsetting the upper strata by 1–5 m. Faulted escarpments of the N—S faults are barely covered by sediments, suggesting that they are tectonically active. The escarpments of the NW—SE faults are rarely exposed, suggesting their late Pleistocene age. A submerged undamaged Neolithic well near a major NW trending fault indicates that the structural stability of these faults during the last 8000 years can be presumed.  相似文献   

A comparative mineralogical study of gas-related sediments of the Gulf of Cádiz     

C. Martín-Puertas  M. P. Mata  M. C. Fernández-Puga  V. Díaz del Río  J. T. Vázquez  L. Somoza 《Geo-Marine Letters》2007,27(2-4):223-235

The Gulf of Cádiz area has been extensively surveyed in recent years and several gas-related fluid escape seafloor structures have been identified. In this study, gravity cores, collected during the ANASTASYA/00 and ANASTASYA/01 cruises, on mud volcanoes, hemipelagic sediments and dredged material from diapiric structures, have been studied. A comparative mineralogical analysis by XRD and SEM of samples from different areas has been performed in order to determine whether there is a characteristic mineralogy related to these fluid escape structures, and also to determine the origin of the mud matrix and constrain the depth of the parent units. The mineralogical analysis reflects the different origins of the different units described in the cores: hemipelagic material of the slope, clays that underlie the mud volcanoes and are discharged at the sea bottom surface, and authigenic and diagenetic minerals possibly involved in the anaerobic oxidation of methane in the mud volcano sediments.  相似文献