Regionalization of Ukraine based on the influence of extreme values of maximum air temperature during warm and cold periods of the year

S. V. Savchuk; N. N. Yuvchenko; V. E. Timofeev

doi:10.31481/uhmj.22.2018.05

S. V. Savchuk
N. N. Yuvchenko
V. E. Timofeev

DOI: https://doi.org/10.31481/uhmj.22.2018.05

Keywords: maximum temperature, cold (warm) period of the year, climatic vulnerability, indicators of extremality

Abstract

Based on the data of maximum daily near-surface air temperature (MSAT) taken from 186 meteorological stations of Ukraine the parameters of extremality with relation to maximum air temperature for different time periods as well as deviations between them during cold and warm periods of the year were calculated. Regionalization of Ukraine was carried out in order to identify climate-vulnerable regions by means of comparison, overlapping and match of the areas with the highest values towards selected extremality thresholds. The conclusion about general increase in extremality over the last decade with relation to a climatic standard is made, the areas with the greatest vulnerability are outlined, and the areas with increase in extremality degree are identified. During both periods of the year certain areas in the southern, central and eastern parts of Ukraine are considered, based on maximum air temperature data, as the most vulnerable ones. During both periods of the year over 2001-2010, as compared to 1991-2000, increase of recurrence of extreme values of average maximum of air temperature was observed: in March and December during the cold period and also from May to July, and in case of EHMP event – in August.

Distribution of maximum air temperature of the EHMP category, in comparison to the category of extreme values, specifies and localizes the regions with the greatest vulnerability. The areas of the highest vulnerability during the cool period comprise the extreme west, south-western and southern regions and during the warm period – southern, south-eastern regions and the extreme east of Ukraine. The spatial distribution of the extreme values of the MSAT for the warm period has a predominantly meridional orientation.

During both periods of the year regions in the south (areas of Black Sea region, Crimea, boundary subregions in the south) areas in the east and center of Ukraine affected by extreme MSAT values are the most vulnerable; in 2010-2014 this influence intensified. Increase in the vulnerability based on the maximum air temperature occurs on the background of certain changes in the atmospheric circulation, under conditions of anticyclonic fields prevalence throughout the year along with increase of the temporal exposure to the elementary synoptic process. On the other hand, the aforementioned increase of recurrence of extreme hydrometeorological phenomena is a consequence of sharp changes of synoptic situation, which is especially the case after a period of settled weather. The conclusion that atmospheric circulation is a main agent responsible for extreme weather and that it is not studied completely so far was made.

References

1. Bindoff, N.L. et al. (2013). Detection and Attribution of Climate Change: from Global to Regional. In: Stocker, T.F., Qin, D., Plattner, G.-K. (Eds.). Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate. Cambridge University Press, United Kingdom and New York, ch. 10.

2. Lipinskyi, V.M., Dyachuk, V.A., Babichenko, V.M. (Eds). (2003). Klimat Ukrainу [Climat of Ukraine]. Kyiv: Publ. Raevskogo.

3. Osadchyi, V.I., Babichenko, V.M. (2013). [Temperature on the territory of Ukraine in the hour of the year]. Ukrainskyi heografichnyi zhurnal [Ukrainian Geographic Journal], 4, 32-39. (In Ukr.).

4. Martazinova, V.F., Ivanova, E.K. (2010). Suchasnyi klimat Kyivskoi oblasti [The modern climate of Kiev region]. Kyiv: Obers. (In Ukr.).

5. Martazinova, V.F., Savchuk, S.V., Vitvitskaya, I.V. (2007). Sostoyanie sredney sutochnoy temperatury vozdukha i sutochnogo kolichestva osadkov zimnego sezona v XX stoletii po Kievu [On the state of daily mean air temperature and precipitation over the 20th century in Kiev in the winter season]. Nauk. pratsi UkrNDGMI [Scientific works of the Ukrainian Research Hydrometeorological Institute], 256, 7-18. (In Russ.)

6. Martazinova, V.F., Ivanova, E.K., Chayka, D.Yu. (2006). Izmeneniya krupnomasshtabnoy atmosfernoy tsyrkulyatsyi vozdukha na protyazhenii ХХ veka i ee vliyanie na po-godnye usloviya i regionalnuyu tsirkulyatsiyu vozdukha v Ukrayne [Changes in large-scale atmospheric circulation over the 20th century and its influence on weather conditions and regional air circulation in Ukraine]. Geofizicheskiy zhurnal [Geophysical Journal], 28(1), 51-60. (In Russ.)

7. Sverdlik, T.A. (1999). Evolyutsiya krupnomasshtabnoy atmosfernoy tsirkulyatsii vozdukha Severnogo polushariya vo vtoroy period sovremennogo globalnogo potepleniya klimata [Evolution in the large-scale atmospheric circulation atmosphere of the Northern Hemisphere during in the second period of the global warming period]. Nauk. pratsi UkrNDGMI [Scientific works of the Ukrainian Research Hydrometeorological Institute], 247, 63-75. (In Russ.).

8. Timofeev, V.E., Tatarchuk, O.G. (2013). Suchasna minlyvist ta prostorovo-chasovyi rozpodil sylnykh snihopadiv na terytorii Ukrainy v umovakh zminy klimatu [Modern variability and spatial and temporal distribution of heavy snowfalls in Ukraine in conditions of the climate change]. Fiz. geogr. ta geomorfologiya [Physical geography and geomorphology], 1(73), 147–154. (In Ukr.).

9. Bedritskiy, A.I., Korshunov, A.A., Handozhko, L.A., Shaymardanov, M.Z. (2007). Gidrometeorologicheskaya bezo-pasnost i ustoychivoe razvitie Rossii [Hydrometeorological safety and sustainable development of Russia]. Pravo i bezopasnost [Law and Safety], 1-2 (22-23). Available at: http://dpr.ru/pravo/pravo_20_2.htm (accessed: 21.05.2018). (In Russ.).

10. Zagrebina, T.A. (2010). Statisticheskiy analiz matrits sopryazhennosti opasnykh yavleniy pogody po territorii Udmurtii [Statistiacal analysis of contingency tables in Udmurtia]. Vestnik Udmurtskogo universiteta [Bulletin of the Udmurt University], 3, 3-11. Available at: http://ru.vestnik.udsu.ru/archive/show/6- 2010-3-1. (accessed: 21.05.2018). (In Russ.).

11. Sosnovska, R.P., Kulbida, M.I., Gumonenko, L.V. (Eds). (2003). Nastanova po sluzhbi prohnoziv ta poperedzhen pro nebezpechni i stykhiini yavyshcha pogody [Service guidance for forecasting and warning about hazardous and natural weather phenomena]. Available at: http://meteo.gov.ua/files/content/docs/meteo_kerdoc/Nastnova%20po%20sluzhbi%20prognoziv.pdf (accessed: 21.05.2018). (In Ukr.).