SVIBOR - Project code: 1-06-218


Strossmayerov trg 4, HR - 10000 ZAGREB
tel.: +385 1 459 44 44, fax: +385 1 459 44 69


SVIBOR - Collecting Data on Projects in Croatia

Project code: 1-06-218


Main researcher: PENZAR, IVAN (36103)

Type of research: basic
Duration from: 01/01/91. to 12/31/95.

Papers on project (total): 104
Papers on project quoted in Current Contents: 13
Institution name: Prirodoslovno-matematički fakultet, Prirodoslovni odjeli, Zagreb (119)
Department/Institute: Andrija Mohorovičić Geophysical Institute, Departement of Geophysics, Faculty of Science, University of Zagreb
Address: Horvatovac bb
City: 10000 - Zagreb, Croatia
Phone: 385 (0)41-420-222
Phone: 385 (0)41-420-114
Phone: 385 (0)41-420-214
Phone: 385 (0)41-420-314
Fax: 385 (0)41-432-462

Summary: Climatic fluctuations in this part of Europe were investigated on the basis of 130-year series of meteorological measurements in Zagreb. The temperature fluctuations due to the cloudiness feedback were studied by means of a local climatic model. Besides, a particular concern was given to the nearground and total ozone contents in the atmosphere above Zagreb and also to potential values of the solar energy input in Croatia together with meteorological conditions convenient for its use. Influence of the atmosphere on the sea was analysed on various spatial and temporal scales - planetary, synoptic, mesoscale. Climatic fluctuations are of a special importance here, as they brought about the exceptionally low sea levels in winter 1988/89. During the event the Adriatic did not follow the inverted barometer law, most probably due to the synchronous influence of various factors (air pressure, wind) on the sea. It was noticed that, although climatic fluctuations became obvious through response of the sea to the atmospheric forcing, atmospheric perturbation resulted from the previous forcing by the sea. As an introduction into the latter process in the Adriatic area, annual and interannual variability of sea surface temperature was analysed.

Keywords: Atmosphere-sea interaction, climatological normals, climatic fluctuations, climatic trend, tropospheric ozone, solar energy, air and sea surface temperature, cloudiness, rainfall, wind and currents, sea level, analytical and numerical models.

Research goals: The idea is to establish the existing trends of climatic fluctuations in this part of Europe. The goal may be achieved by the formulation of such a deterministic climatic model which is sensitive to planetary climatic fluctuations. Such model has been evaluated on the Austrian and Swiss stations data and it has been shown that cloudiness influenced the temperature circumstances in the "greenhouse effect" more than anthropogenic effects. Long-term series of the climatological elements in Zagreb are submited to homogeinity and variability tests to make a basis of an estimation of the data relative homogeinity for other stations in Croatia. The investigation of the solar radiation potential values and relevant meteorological conditions for the energy collection aims to help the solar energy exploitation in Croatia. Besides, the methods are under development for an estimation of the illumination, photosynthetic part of light and the ultraviolet radiation being important in biological investigations. A research of the tropospheric ozone points to periodically high concentrations in the summer, but under the permited limits. The existing one-layer Lagrangian model is to be expanded to include physical characterisrics of boundary layers in the air and the ocean. That way we may determine characteristic air trajectories over Adriatic Sea during given weather situations and get acquainted with a possible long-range transport of pollutants from distant emission sources. Response of the Adriatic Sea to the atmospheric forcing is of interest as well. Particularly important is the influence of the air pressure and wind and of the heat and water fluxes, on the processes in the sea. An attempt is made to connect the atmospheric changes with the sea variability, in order to cover coupling of the atmosphere and sea "in toto".

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Last update: 10/12/95