Extreme Air Temperatures at the Southwestern Slope of Pirin Mountain (Bulgaria) and Related Synoptic Conditions

Authors

  • Nina Nikolova Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”
  • Georgi Ratchev Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”
  • Martin Gera Faculty of Mathematics, Physics and Informatics - Comenius University
  • Dimitar Krenchev Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”
  • Simeon Matev Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”

DOI:

https://doi.org/10.7546/CRABS.2022.01.09

Keywords:

extreme cold days, extreme warm days, synoptic situations, mountain, Bulgaria

Abstract

The article examines the occurrence of extremely cold and extremely warm days as an indicator of environmental changes in the Pirin Mountain (Bulgaria). The study is based on hourly air temperature data recorded by an automatic weather station. By averaging the hourly data, daily values are calculated. The occurrence of extremely cold and extremely warm days during the period 2015–2018 for January, April, July and October are analyzed. Extreme temperature days are determined by threshold values for the 10th and 90th percentiles. Characteristic synoptic situations related to the manifestation of extreme temperatures are presented. As a result of the research it was established that the advections of air masses are the leading factor for the occurrence of extreme temperatures. In addition very important for the extremely low temperatures is the high air pressure over the Balkan Peninsula.

Author Biographies

Nina Nikolova, Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”

Faculty of Geology and Geography Sofia University “St. Kliment Ohridski”
15, Tsar Osvoboditel Blvd
1504 Sofia, Bulgaria
nina@gea.uni-sofia.bg 

Georgi Ratchev, Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”

Faculty of Geology and Geography Sofia University “St. Kliment Ohridski”
15, Tsar Osvoboditel Blvd
1504 Sofia, Bulgaria
ratchevg@gea.uni-sofia.bg

Martin Gera, Faculty of Mathematics, Physics and Informatics - Comenius University

Faculty of Mathematics, Physics and Informatics Comenius University
Bratislava 842 48 Mlynska dolina, Slovakia
martin.gera@fmph.uniba.sk

Dimitar Krenchev, Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”

Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”
15, Tsar Osvoboditel Blvd
1504 Sofia, Bulgaria
dkrenchev@gea.uni-sofia.bg

Simeon Matev, Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”

Faculty of Geology and Geography - Sofia University “St. Kliment Ohridski”
15, Tsar Osvoboditel Blvd
1504 Sofia, Bulgaria
smatev@gea.uni-sofia.bg

Downloads

Published

02-02-2022

How to Cite

[1]
N. Nikolova, G. Ratchev, M. Gera, D. Krenchev, and S. Matev, “Extreme Air Temperatures at the Southwestern Slope of Pirin Mountain (Bulgaria) and Related Synoptic Conditions”, C. R. Acad. Bulg. Sci. , vol. 75, no. 1, pp. 71–79, Feb. 2022.

Issue

Section

Geophysics