DATE2018-05-11 08:30:58
IDABSTRACT20180511083058-0163
CONTACTmatej.ogrin@ff.uni-lj.si
PRESENTATIONORAL
INVITED0
IDSESSION1
TITLEMINIMUM TEMPERATURES IN SLOVENIAN ISTRIA AS THE RESULT OF LOCAL CLIMATE IMPACT
AUTHORSD Ogrin (1), M Ogrin (1)
AFFILIATIONS
  1. Dept. of Geogrpahy, University of Ljubljana, Ljubljana, Slovenia
ABSTRACTAlthough Slovenian Istria is considered to be the warmest region in Slovenia – winters in particular are significantly warmer there than in other Slovenian regions, as also confirmed by the data of official meteorological network – minimum temperatures on the local level can drop very low. Local landform features allow the occurrence of frost hollows in concave shapes of land, where explicit night cooling occurs during the radiation weather type. This affects the local areas where natural vegetation grows and also causes less favourable conditions for growing cultural plants, also some Mediterranean ones, such as olive trees. The threat of frost and hoarfrost is bigger, temperature losses in residential buildings are greater, and stronger is the possibility of local air pollution if pollution sources are located within the areas of frequent temperature inversion. At the same time, the occurrence of frost hollows is a local particularity. The results of measurements in frost hollows over several years have confirmed the anticipations that thermometer drops lower than the values hitherto obtained by stations in the official meteorological network. Even more, the measurements have shown that the so-far measured extreme values that were believed to be exceptional events were registered at least at one measuring post in almost each observed winter. Outstanding as real frost hollows are the hollows with an uninterrupted rim in the Slavnik range and Čičarija, at the Podgorski Kras (the valleys of Petrinjska Vala and Črnotijska Vala), in the valleys at the transition from karst to flysch areas of Slovenian Istria (the valleys of Movraška Vala and Gračiščka Vala) and in the blind valley of Malinska. At least in one of these frost hollows temperature dropped under –15 0C each winter, and in very favourable conditions for air cooling, when the surface is covered with snow, even under –20 0C.
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