1. Zoran Stanivukovic,
Republic of Srpska, Bosnia and Herzegovina
2. Marijana Kapovic Solomun, Шумарски факултет Бања Лука ,
Republic of Srpska, Bosnia and Herzegovina
3. Svjetlana Coralic,
Republic of Srpska, Bosnia and Herzegovina
Introduction
Frosts hollows are specific sites where accumulated cold air causes significantly lower temperature values compared with surrounding terrain. The most often they are appeared in valleys and karst sinkholes, with favorable conditions for night cooling. Cold air, accumulated in frost hollow, beside extremely low temperature, also reflects on vegetation, causing so-called vegetation inversions. The „Međi Do“ is located in western part of Bosnia and Herzegovina, northeastern slopes of Grmeč Mountain. It is a karst sinkhole, with elongated ellipse shape and dimensions 600 m x 350 m. The longitudinal axis direction is southwest-northeast. The depth is 80 m, with lowest point on 480 m, while the edge of frost hollow is 560 m altitude. The measuring point is located at 483 m altitude with coordinates (44°40'16.40" SGS and 16°33'55.35" IGD). The closest meteorological station is Sanski Most, which is 14 km away. The temperature regime at the research site is very specific and shows significant deviations compared with meteorological stations located in the vicinity.
Material and method
The automatic weather station „TFA NEXUS“ was used for this research. Station is located in a meteorological wooden shelter (house) at a height of 2 m. Measurement of air temperature is set every 30 minutes, 24 hours a day, and 1.5 V lithium batteries are used to power the station. Temperature measurements has been started on February 22, 2014. to April 04, 2014. with interruption after this period. Continuous, uninterrupted observations last from September 27, 2014. This paper aimes to analyze and present the air temperatures of the frost hollow „Međi Do“ for 2015 and 2016.
Results
The average annual temperature for 2015. was 6,6 °C, average minimum was 0,1 °C, while average temperature maximum was 15,1 °C. The absolute temperature maximum was 33,7°C, and absolute minimum -30,1 °C. During vegetation period average temperature was 12,8 °C. There were only 188 days with temperature above 0 °C, and negative values was not recorded only in August. Annual temperature amplitude was 63,8 °C.
The average annual temperature for 2016. was 7,1 °C, with average minimum 0,5 °C, and maximum 15,0 °C. The absolute temperature maximum was 31,5 °C, and absolute minimum 28,8 °C. The average temperature in the vegetation period was 12,5 °C. The number of days with temperature above 0° C were 163. The negative air temperature was not recorded in June and July. The annual amplitude of temperature was 60,3 °C. Although research area is located between 480 – 560 m altitude, temperature regime of „Međi Do“ is very specific and characterized with highly lower average temperature over the year and vegetation period, compared with other known frost hollows in region.
Кључне речи :
Тематска област:
Екологија шума и очување природних ресурса
Датум:
01.09.2017.
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