Tilts due to the free nutation of the Earth's axis in the results of geodetic observations     

Antonín Zeman  Reviewer M. Burša  Reviewer M. Pick 《Studia Geophysica et Geodaetica》1981,25(3):284-288

Summary Simple expressions for the deformation of equipotential surfaces and changes of the deflections of the vertical are derived at points of the Earth's surface, which are due to the variations of the rotational component of the gravity potential under free nutation of the Earth's axis of rotation (pole wandering). The results of the solution of this problem given in[1] are discussed. The values of the tilts and the changes of geoid heights for extreme deviations of the poles are considered from the point of view of the effect on measuring tilts and on levelling. An elastically deformable Earth is assumed. It is concluded that reductions with respect to the mean Earth's pole are not realistic at the present degree of accuracy of levelling. The necessity to reduce long-term tilt observations, or the possibility of determining the time variations of the rotational axis from the analysis of these observations is pointed out.  相似文献   

Bewölkung über Mitteleuropa nach den Satellitenaufnahmen     

Aleš Gottwald  Rezensent J. Pavlik 《Studia Geophysica et Geodaetica》1981,25(4):413-415

Zusammenfassung Es wurde u.a. festgestellt, dass in der fünfjährigen chronologischen Reihe der Bewölkungsgrade Mitteleuropas mehrere Perioden vorkommen. Es wird angenommen, dass die 28–29-Tage-Periode von solaren oder lunaren Einflüssen hervorgerufen sein könnte. (Dieser Kurzbericht stammt aus dem ausführlicheren Text des Vortrages, der an der wissenschaftlichen Tagung im Institut den 8. 12. 1977 vorgelesen wurde.)  相似文献   

Possible differences between mean sea-levels from satellite altimetry     

Milan Burša  Zdislav Šíma  Reviewer J. Picha 《Studia Geophysica et Geodaetica》1981,25(1):1-4

Summary The first attempt has been made at determining the differences between mean sea-levels, using the recent satellite altimetry data [1].  相似文献   

On the problem of equal area block on a sphere     

Karel Klíma  Miloš Pick  Zdeněk Pros  Reviewer M. Burša 《Studia Geophysica et Geodaetica》1981,25(1):24-35

Summary A new untraditional way of dividing the sphere surface into an arbitrary number of equal area blocks by means of a spiral is proposed and its statistical properties are analysed.  相似文献   

Chemical speciation of trace metals at the air-sea interface: The application of an equilibrium model     

Leonard W. Lion  James O. Leckie 《Environmental Geology》1981,3(5):293-314

Air-sea interfacial solutions have characteristically high concentrations of trace metals, microorganisms, organic compounds, and solids relative to bulk solutions. The potential for the chemical interaction of an array of trace metals in the interfacial regions with complexing organic ligands and adsorbing solid surfaces has been evaluated through the use of an equilibrium computer model. Computations suggest that higher interfacial accumulations of copper and lead may occur relative to cadmium and mercury. These results are found to be generally compatible with available field data describing trace metal interfacial accumulation. The forms of metals found to be partitioned between bulk and interfacial solutions are consistent with the hypothesis that solid surface adsorption and dissolved organic complexation reactions bring about metal enrichment at the surface microlayer.  相似文献   

Temporal Variations in Sea Surface Topography and Dynamics of the Earth's Inertia Ellipsoid     

Burša  Milan  Kouba  Jan  Raděj  Karel  True  Scott A.  Vatrt  Viliam  Vojtíšková  Marie 《Studia Geophysica et Geodaetica》1999,43(1):7-19

Temporal variations in the nine elements of the Earth's inertia ellipsoid due to sea surface topography dynamics were derived from TOPEX/POSEIDON altimeter data 1993 - 1996. The variations amount to about 10 mm in the position of the center of the Earth's inertia ellipsoid (E _i ), 0.15' in the polar axis direction of E _i and to about 0.0003 in the denominator of its polar flattening. The approach used is based on the temporal variations of distortions computed by means of the geopotential model EGM96 which is used as reference.  相似文献   

Solar Activity Effects on Gravity Wave Activity Inferred from Radio Wave Absorption in the Lower Ionosphere     

Laštovička  J. 《Studia Geophysica et Geodaetica》1999,43(1):107-128

The low frequency (LF) nighttime radio-wave absorption in the lower ionosphere has been measured at Prhonice (50°N, 15°E) in central Europe for over 35 years. Digital measurements, performed since summer 1988, allow absorption oscillations in the period range 10 – 180 mins, which are believed to reflect gravity wave activity, to be derived. Unfortunately, problems with the transmitter in recent years terminated the evaluation of gravity wave activity. The analysis of the available information (6 years of data) allows two conclusions to be drawn as to the effects of the solar activity on gravity wave activity: (1) there is no detectable effect of the solar 27-day variation on gravity wave activity; (2) there is an indication that the positive effect of the 11-year solar cycle on gravity wave activity in the winter half of the year is remarkable (lack of data in summer). The result concerning the solar cycle effect is, to a certain extent, preliminary, because the available data do not cover a complete solar cycle. A comparison with results from other stations and an interpretation of results are presented.  相似文献   

Solution of the inner stokes problem for a sphere     

Miloš Pick  Reviewer M. Burša 《Studia Geophysica et Geodaetica》1976,20(2):193-196

Summary In the present paper the inner Stokes problem is solved.  相似文献   

Continuous computer contouring     

Ivan Pšenčík  Reviewer A. Zátopek 《Studia Geophysica et Geodaetica》1975,19(2):184-187

Summary A method is proposed for determining the precise shape of the isolines, corresponding to any continuous and non-constant function of two variables. The co-ordinates of the points of the isolines are determined by solving numerically two ordinary differential equations of the first order which describe the isoline. A model example is given, in which the isolines of a function, determined by bicubic spline interpolation from values, given in a regular network, are found.  相似文献   

Estimate of the time interval of activity of volcanoes of the basalt formation of the lower jeseník mts. based on palaeomagnetic data     

František Marek  Reviewer F. Janák  Reviewer V. Kropáček 《Studia Geophysica et Geodaetica》1971,15(1):100-104

Summary Virtual geomagnetic poles, corresponding to the directions of primary remanent magnetization of the neovolcanic occurrences studied in the Lower Jeseník, form a close group which is positionally considerably removed from the present geographic pole. By comparison with some published data on the extent of the secular variation of the geomagnetic field, a conclusion was drawn that the assumption of a practically simultaneous generation of the considered volcanites (over a period of about one third of the longest secular variation cycle) is at least twice as probable as the assumption of an expressive difference in their age.  相似文献