1.        Glasnović, D. (1995): Atmospheric static stability in respect to static energy changes. Geofizika, 12, 1-13.  

 

ABSTRACT:

 

       This theoretical study deals with the static part of the total energy and tends to explore the functional relationship between its changes and atmospheric static stability. It is shown that a dimensionless energy number may be defined in terms of isentropic analysis to be the function of static stability with recognizable physical meaning. Its mathematical properties indicate that this particular dependence may be described by a bilinear fractional function taking a form of an equilateral hyperbola with asymptotes parallel to the coordinate axes. Its unstable branch corresponds to the higher rate of change of static energy and lies in the first quadrant, while in the third one its lower rate is related to the stable branch. Asymptotic solution of considered theoretical problem implies that the transition from stable to unstable branch may appear only by an infinite jump and holds an intriguing resemblance with either the quantum transition between two energy shells by the absorption or emission of energy or the transition from stable to unstable regime of the general atmospheric circulation.

 

Keywords: Atmospheric static stability, isentropic analysis, static energy

 

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2.        Jurčec, V. and N. Brzović (1995): The Adriatic bora: special case studies. Geofizika, 12, 15-32.

 

ABSTRACT:

 

       Two cases of the most severe bora episodes along the Adriatic coast of Croatia are investigated. In the first case of 29 January 1994 the absolute maximum gust of 48.5 m s^-1 was recorded in Split. The second case is related to the longer-lasting bora of 13-17 March 1962, when it was possible to investigate the vertical atmospheric by means of downstream sounding in Split and two upstream sounding in Zagreb and Beograd.

       Although in both cases the bora onset is caused by a frontal passage, the maximal local speeds occur afterwards and coincide with a pronounced short period pressure perturbation.

       Both cases were characterized by the temporal occurrence of the well marked superadiabatic layers in the low troposphere.

       The vertical structure in the March case shows the temperature inversion in Split data that is strongest during the maximum bora speed, and an unstable layer below inversion, in agreement with the turbulent “dead” region defined in the internal hydraulic theory.

 

Keywords: Severe Bora events, Eastern Adriatic coast

 

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3.        Strelec, N. (1995): Correlation of vorticity advection values and grey shade values in infra-red satellite images. Geofizika, 12, 33-41.   

 

ABSTRACT:

 

       A statistical analysis of the correlation between vorticity advection values and grey shade values in infra-red satellite images is presented. Average correlation coefficients for six-month data set in all four chosen levels were found positive. This means that higher vorticity advection values result in brighter grey shades in satellite images. The best correlation was found for vorticity advection in 500 and 300 hPa levels. Absolute values of average coefficients are below 0.2 meaning that correlation is not good in all synoptic situations. The results were significantly improved when only those images were considered in which comma cloud structures, enhanced cumuli clouds or frontal intensifications were found. Statistics for the 16 selected cases indicated satisfactory correlation between vorticity advection and pixel values. This enables forecasting of cloud paths and development by following the vorticity advection maxima related to the mentioned cloud structures.  

 

Keywords: Vorticity advection, infra-red satellite images

 

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4.        Herak, M., D. Herak and S. Markušić (1995): Fault plane solutions for earthquakes (1956-1995) in Croatia and neighboring regions. Geofizika, 12, 43-56.

 

ABSTRACT:

 

       The study presents (re)evaluation of fault-plane solutions for 40 earthquakes that occurred in the period 1956-1995 in Croatia and neighboring regions. All events were analyzed in the same manner, using the best available velocity models and the most recently updated earthquake catalogue for that region. For the most important earthquakes our solution is briefly discussed and compared to the results of previous studies when they were available. The results are presented with all related data thus enabling estimation of each solution’s reliability.

 

Keywords: Fault-plane solution, seismicity

 

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5.        Wu, Z., S. G. Kim and Y. Gao (1995): Broadband b: scaling law of P-wave broadband radiated energy. Geofizika, 12, 57-67.

 

ABSTRACT:

 

       We analyzed the NEIC broadband radiated energy catalogue and found that the scaling law of earthquake energy deduced from Gutenegberg-Richter’s law is not valid in a quantitative sense. The analysis of broadband radiated energy, however, also shows a scaling law, which may be represented by a broadband b value.

 

Keywords: Broadband radiated energy, Gutenegberg-Richter’s law

 

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