1.       Penzar, I. and D. Poje (1999-2000): Review of meteorological research in Croatia. Survey of situation up to 1997. Geofizika, 16-17, 1-32. 

 

ABSTRACT:

 

       This review of meteorological research is based on the published professional and scientific papers. Papers are divided into 19 main topics: books, measurements and data processing, solar energy, planetary boundary layer, ecological problems, climatological papers, research on wind and air humidity, traffic and agricultural meteorology, hail defense, biometeorology, air- sea interaction, atmospheric electricity, history of meteorology, research projects and other activities. For every group, main research problems and achieved results are outlined on the basis of selected papers, which are quoted in the list of references. This list does not include complete bibliography of meteorological papers published so far in Croatia. However, it was in- tended to include all authors with some of their papers in order to get insight into research they were involved with, and their contribution. The first meteorological papers commenced to appear in the middle of the nineteenth century but the greatest number of papers has been published in the last 50 years. This is in harmony with the development of meteorology as profession and of meteorological institutions: Geophysical Institute "Andrija Mohorovičić" and Meteorological and Hydrological Service.

 

Keywords: Meteorological research, Croatia, published papers

 

[PDF]

 

 

2.       Tiwari, R. K. and K. N. N. Rao (1999-2000): Solar and tidal reverberations of deglaciation records from the tropical western Pacific: a clean spectral approach. Geofizika, 16-17, 33-41. 

 

ABSTRACT:

 

       The search for the role of solar and tidal cycles in terrestrial climate records is an interesting curiosity. Powerful clean spectroscopy of high resolution carbon and oxygen isotope records from the tropical western Pacific Sulu Sea, over the past 9000-22000 years reveals statistically significant (at > 90% confidence interval) spectral lines corresponding to periods of 2980, 690, 322, 250, 174 and 140 years and 1100, 533, 425, 183 and 151 years, respectively. These spectral peaks fall into different solar-climate frequency bands and have beat relationships to each other. The results suggest intricate physical linkages between solar and climate cycles and provide significant information for understanding solar-terrestrial climate variability in the past centuries. 

 

Keywords: Clean spectroscopy, solar and tidal cycles, climate changes

 

[PDF]

 

 

3.       Peljto, A. and Z. Bencetić Klaić (1999-2000): Accidental release of hydrogen sulfide in Nagylengyel, Hungary November 14, 1998 - a trajectory study. Geofizika, 16-17, 43-51.

 

ABSTRACT:

 

       The movement of air parcels polluted due to an accidental release of H_2S close to the Croatian border is examined. Emission started on November 13, 1998 at around 2330 UTC. Trajectories starting at 0000 UTC were calculated by a dynamic method which provides realistic nonlinear variations of the wind field in space and time. Pressure gradients were calculated from the ECMWF surface pressure forecasts using two finite-difference schemes: centered and off centered. According to one-day forward trajectories, polluted air was transported over Hungary, Slovakia and Ukraine. Furthermore, measurements of daily mean S0_2 concentrations in the air for 5 locations in Croatia confirm that concentrations were not affected by the accidental emission.

 

Keywords: H₂S, accidental release, trajectory study

 

[PDF]

 

 

4.       Pandžić, K. and D. Trninić (1999-2000): Relationship between the Sava river monthly precipitation, its discharge and large-scale circulation. Geofizika, 16-17, 53-63.   

 

ABSTRACT:

 

       The relationship between monthly precipitation and discharge fields have been considered over the Sava river basin including their linkage with the European-Northern Atlantic sea-level pressure distribution. For that purpose, 30-year (1961-1990) time series of the precipitation, discharge and sea-level pressure data have been used. Their analysis was made by means of the Principal Component Analysis (PCA) technique. Two slightly different subregions have been discovered within the Sava river basin, regarding to their annual precipitation and discharge regimes respectively. Also four anomaly patterns (types) have been established including a rather high correlation between the meteorological and the hydrological fields. Finally, an interpretation the Sava river precipitation and discharge in terms of the European-Northern Atlantic sea-level pressure anomaly field has been stated.

 

Keywords: Precipitation, river discharge, large-scale circulation

 

[PDF]

 

 

5.       Narayan, J. P. (1999-2000): Strong ground motion simulation using shear dislocation sources. Geofizika, 16-17, 73-86.

 

ABSTRACT:

 

       Paper presents the generation and implementation of various types of earthquake sources in a 2D finite difference grid. The procedure used for computing dislocations on the fault plane is identical to both well known kinematic and dynamic models, since it was calculated by solving the equation of motion taking into account the stress drop and the shear strength of the fault. This scheme is superior over the kinematic model because it calculates dislocation using stress drop instead of taking a priori dislocation pattern without any physical reasoning. Unlike the dynamic model, it does not require driving and resisting forces. The parsimonious staggered grid method was adopted instead of the conventional staggered grid since it requires less computational memory and enjoys the same advantage of being stable for larger Poisson's ration, and free from spatial derivative of elastic parameters. Further, this scheme is flexible and allows a simple way of incorporating stress-free boundary condition. The algorithms were written for the simulation of P-SV and SH-waves propagation. The computed radiation patterns of the various earthquake sources for P-SV and SH-waves are in good agreement with the analytical radiation patterns. The effects of soil thickness and the velocity within it were studied in detail since they play an important role in the amplitude amplification, changes in signal duration, frequency content and mode conversion. Results depict that for the steeply incident waves, the impedance decrease and resonance effects control the amplitude amplification. The mode conversion at interfaces and multiple reflections in the surficial layer increase the signal duration.

 

Keywords: Strong ground motion, simulation, finite difference method

 

[PDF]

 

 

6.       Rakoczi, F. and Z. Ivanyi (1999-2000): Water vapour and greenhouse effect. Geofizika, 16-17, 65-72.  

 

ABSTRACT:

 

       Water content of the atmosphere and its role in the greenhouse effect is investigated. Values of solar constant measured by satellite Nimbus-7 channel 100 have been used for calculating effective temperature of the atmosphere by Stefan- Boltzmann's law. The greenhouse effect is defined as the difference between the surface temperature and the atmosphere effective temperature. The yearly variation of greenhouse intensity was calculated. It was found that relation between greenhouse intensity and water vapor content is logarithmic.

 

Keywords: Greenhouse effect, water vapor

 

[PDF]