Abstract
This chapter present climate condition in Lower Danube Valley in North Bulgaria. It used average monthly and average annual data on air temperature and precipitation from 10 meteorological stations located evenly on the study territory. In order to reveal the dynamics of climate change, are data calculated 30-year, 20-year, 10-year moving averages, which determined the affiliation to climate types according to the Köppen classification. The climatic types for each individual year are also calculated. The results reveals of dry steppe climate (BSk) in the eastern and central parts of the study area for some of the years. The presence of Mediterranean influence has been registered, which is defined by the Csa and Csb indices. At the same time, the Mediterranean influence is not revealed when use the 30- and 20- years moving average. When use 10- year moving average the presence of Mediterranean influence is established in only 2 stations for the period in second half of 80’s and first half of 90’s of the twentieth century. According to the 10-year moving averages in the Knezha region, we register a continental climate with a cold winter (Dfa) for the period of the 60s and early 70s. According to Annual Climate Type (ACT) study area is under Potential Aridity Condition (PAC) for half of study period.
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Acknowledgements
This work has been carried out in the framework of the National Science Program “Environmental Protection and Reduction of Risks of Adverse Events and Natural Disasters”, approved by the Resolution of the Council of Ministers No 577/17.08.2018 and supported by the Ministry of Education and Science (MES) of Bulgaria (Agreement No Д01-363/17.12.2020).
We thank to prof. Liliana Zaharia from University of Bucharest and prof. Abdelazim Negm for invitation and opportunity to publish in this prestige book. We thank to prof. Vincent Dubreuil from University of Rennes for nice discusions about Köppen climate classification. We also thank to editor prof. Abdelazim Negm and the anonymous reviewers for their constructive comments.
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Popov, H. (2022). Using Köppen Climate Classification Like Diagnostic Tool to Quantify Climate Variation in Lower Danube Valley for the Period 1961–2017. In: Negm, A., Zaharia, L., Ioana-Toroimac, G. (eds) The Lower Danube River. Earth and Environmental Sciences Library. Springer, Cham. https://doi.org/10.1007/978-3-031-03865-5_8
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